Vibtoolbox is a set of command line tools for analysis of vibration and acoustic test data. The interface design used for most of the tools in the package is the standard UNIX filter model. The tools take input on standard input and transform the input in some fashion, and then send the transformed input data to standard output. The tool set also defines ASCII and native binary database formats for storage of vibration and acoustic laboratory and flight test data.
Vibtoolbox was started in 2003 by Greg Rudd, out of the need to have a set of tools to handle vibration and acoustic test data in a general and portable way. An important goal of the project was that the code for the analysis tools would be self contained and easy to port and maintain on different UNIX operating systems.
The programs in this package are designed to work with SI absolute units, US absolute units, and US gravitational units. The programs do not work with the US engineering system of units that require a additional factor to be included in the relation between force and mass. Any consistent units may be used in the programs. This means that all parameters must be expressed in the same units within the program. Examples of consistent units that work in these programs are:
------------------------------------------------------
System Force Length Mass Time
------------------------------------------------------
SI kilonewton meter kilogram second
SI newton millimeter kilogram second
US pound-force inches lbf-s^2/in second
US pound-force foot slug second
US poundal foot pound second
The vibtoolbox utilities are used like other standard UNIX command line utilities. Standard output from one program can be passed to standard input of an another program via UNIX pipes. Also the programs process input and output data using UNIX I/O redirection. The programs in the package use a subset of the gnuplot data format for the STDIN and STDOUT streams. The utilities handle commend line options using the getopt utility.
For example lets see how we would use the filters to analysis some flight test time history data.
Assume for the example we have the flight data stored in the vibtoolbox ASCII database format.
The ASCII data can then be packed to native binary format using:
packdb flights channels < DATABASE > DATABASE.BIN
Where:
flights is a list of flight conditions to process
channels is a list of channels to process
DATABASE is the input ASCII database
DATABASE.BIN is the output binary database
Note flight conditions and channels are input using a colon operator to
for example:
1,2,10:15,6 would expand to 1,2,10,11,12,13,14,15,6
To read a time record from the binary database use:
breaddb conditions channels < DATABASE.BIN > TimeHistory
Were TimeHistory contains the extracted time history in gnuplot format.
Calculate basic properties of the time history record using:
checkth < timehistory
Sample output is:
#BLOCK Flight = 23 Channel = 12104
Samples per Second = 5998.784
Standard Deviation Sample Rate = 0.167
Maximum signal level = 266.659
Minimum signal level = -266.667
Signal duration = 60.012
Number of samples = 360000
Signal standard deviation = 5.932e+01
Signal mean = 2.257e-01
Crest factor = 4.496e+00
Calculate autospectral density of the time history using:
asd PointsPerSegment NumberOfAverages < TimeHistory > AutoSpectralDensity
Calculate autospectral density without writing out the time history to a file using:
cat DATABASE.BIN | breaddb conditions channels | asd PointsPerSegment NumberOfAverages > AutoSpectralDensity
The vibtoolbox tools can be used with other UNIX utility's on the command line. For example to add calculation of RMS signal level to the above calculation use:
cat DATABASE.BIN | breaddb conditions channels | asd PointsPerSegment NumberOfAverages | tee ASD.OUT | rms > RMS.OUT
autospectral density is stored in file ASD.OUT using the UNIX tee command.
This program calculates random response spectra given autospectral density
input. The response is calculated referenced to inertial space coordinates.
USAGE: absrs [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-q number = quality factor
default quality factor = 10
STDIN:
The input file is a free-format ASCII text file with two columns.
Frequency (Hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file. Each data set is
separated by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns.
Frequency (hz) and RMS Response Amplitude (eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set is
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates airspeed parameters and atmosphere properties.
USAGE: airspeed [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
To calculate airspeeds given Mach use: "Mach" altitude(ft) Mach
To calculate airspeeds given keas use: "keas" altitude(ft) keas
To calculate airspeeds given ktas use: "ktas" altitude(ft) ktas
To calculate airspeeds given kcas use: "kcas" altitude(ft) kcas
To calculate properties at altitude use: "prop" altitude(ft)
STDOUT:
Given altitude in feet and one of
the airspeeds(Mach, KEAS, KCAS, KTAS), the program will return.
Altitude(ft) keas kcas ktas Mach Dynamic Pressure(psf)
Also given altitude in feet the program can return the following atmosphere
properties.
Alt(ft) Density(slug/ft^3) Temp(degree R) Press(psf) Speed of Sound(fps) viscosity(slug/ft/sec)
This program calculates autospectral density given input time history.
Usage: asd [OPTIONS] "Points Per Segment" averages STDIN STDOUT
OPTIONS
-m = remove mean from data
-a = calculate analysis parameters given the total number of analysis points
and the sample rate. Returns a table of points per segment, number of segments
to average, frequency resolution, and standard error.
-h = print help message
Points Per Segment = number points per analysis segment
averages = number of segments to average
STDIN:
The input file is a free-format ASCII text file with two columns:
Time (sec) and amplitude (eu)
eu is engineering unit.
There may be more then one data set in the input file. Each data set in
separated by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and autospectra density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program transforms acceleration PSD(eu^2/Hz) to velocity PSD(eu^2/Hz).
eu = engineering units
USAGE: asdvsd [OPTION] STDIN STDOUT
OPTIONS
-h prints help message
-g = factor to normalize acceleration by gravity
default = 386.1
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(Hz) and PSD(eu^2/Hz)
EU is engineering unit.
There may be more then one data set in the input file each data set in
separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(Hz) and PSD(eu^2/Hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates autocorrelation of signal.
USAGE: autocorr [OPTION] STDIN STDOUT
OPTIONS:
-h prints help message
-l number of lag points
STDIN:
The input file is a free-format ASCII text file with two columns:
Time and amplitude(EU)
EU is engineering unit.
There may be more then one data set in the input file
each data set in separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
lag Rxx
There may be more then one data set in the output file.
Each data set in separated by 2 blank lines. This
file can be processed by gnuplot.
Calculates average of a set of vibration spectra.
USAGE: avespec [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with 2 columns.
Frequency (hz) and amplitude spectra (eu) or autospectral density (eu^2/hz)
There may be more then one data set in the input file each data set in
separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and amplitude spectra (eu) or autospectral density (eu^2/hz)
This file can be processed by gnuplot.
Reads time history from binary database and transforms to autospectral density.
USAGE: bdb2psd [OPTIONS] CONDITIONS CHANNELS POINTS AVERAGES STDIN STDOUT
OPTIONS
-s = number = segment input signal into power of 2 size segments
number = segment size (power of 2)
-m = remove mean from time signal.
-a = calculate analysis parameters given the total number of analysis points
and the sample rate. returns a table of points per segment, number of segments
to average, frequency resolution, and standard error.
-h print help message
CONDITIONS = list of conditions to parse from database
CHANNELS = list of channels to parse from database
Note conditions and channels are input using a colon operator to
for example:
1,2,10:15,6 would expand to 1,2,10,11,12,13,14,15,6
POINTS = number of points in analysis segment
AVERAGES = number of autospectral densities to average
STDIN:
database file binary format.
GOOD/BAD scale x0 dx np condition channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec)
dx = delta time(sec)
np = number of amplitudes
condition = condition(integer number)
channel = channel(integer number)
y = amplitude(eu)
eu is engineering unit.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set is
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates natural frequencies of beams.
USAGE: beamfn STDOUT
Interactive input
STDOUT:
The output file is a free-format ASCII text file:
Natural Frequency(Hz) = fn
Calculates conditions and channels that define spectra maximum envelope from
binary database.
USAGE: bmaxfc CONDITIONS CHANNELS STDIN STDOUT
CONDITIONS = list of conditions to parse from database
CHANNELS = list of channel numbers to parse from database
Note conditions and channels are input using a colon operator to
for example:
1,2,10:15,6 would expand to 1,2,10,11,12,13,14,15,6
STDIN:
The database file is a native binary format.
GOOD/BAD scale x0 dx np condition channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting frequency
dx = delta frequency
np = number of amplitudes
condition = condition(integer number)
channel = channel(integer number)
y = amplitude(eu) or autospectral density (eu^2/hz)
eu is engineering unit.
STDOUT:
The output file is a free-format ASCII text file with three columns:
Frequency(hz) and envelope condition number and envelope channel number
There may be more then one data set in the output file. Each data set is
separated by 2 blank lines. This file can be processed by gnuplot.
STOP
Read data from binary database to create setup file for cross spectral density or
coherence analysis programs csd and cohere.
USAGE: breadcd [OPTIONS] FILE STDIN STDOUT
OPTIONS:
-h = help message
FILE is a file with three columns that defines flights and channels to calculate in format:
Condition and Forced Channel and Response Channel
STDIN:
The database file in a native binary format.
GOOD/BAD scale x0 dx np condition channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec)
dx = delta time(sec)
np = number of time points
condition = condition(integer number)
channel = channel(integer number)
y = amplitude(eu)
eu is engineering unit.
STDOUT:
The output file is a free-format ASCII text file with three columns:
time (sec) and amplitude (eu) and amplitude (eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set is
separated by 2 blank lines. This file can be processed by gnuplot.
Read time history or spectra from binary database.
USAGE: breaddb [OPTIONS] CONDITIONS CHANNELS STDIN STDOUT
OPTIONS:
-h = help message
CONDITIONS = list of flight conditions to parse from database
CHANNELS = list of channel numbers to parse from database
Note conditions and channels are input using a colon operator to
for example:
1,2,10:15,6 would expand to 1,2,10,11,12,13,14,15,6
STDIN:
The database file in native binary format.
GOOD/BAD scale x0 dx np condition channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec) or frequency
dx = delta time(sec) or frequency
np = number of amplitudes
condition = condition(integer number)
channel = channel(integer number)
y = amplitude(eu) or spectra amplitude
STDOUT:
The output file is a free-format ASCII text file with two columns:
time(sec) or frequency and amplitude(eu) or spectra amplitude (eu) or autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set is
separated by 2 blank lines. This file can be processed by gnuplot.
Calculate breakpoints on log-log coordinates.
USAGE: breakpoint [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency (hz) and amplitude (eu) or autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file. Each data set is
separated by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and amplitude (eu) or autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates damping of detected peaks in amplitude spectra or autospectral density.
USAGE: calq [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency (hz) and amplitude (eu) or autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set in
separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Quality factor
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
Differentiation of time history data.
USAGE: cdiff [OPTION] SCALE STDIN STDOUT
SCALE = scale factor for calculated result.
Use 1/386.1 to scale acceleration in inches/seconds^2 calculated from velocity
input time history in inches/seconds to units of g's.
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time(seconds) and Amplitude(EU)
EU is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
Output File:
The output file is a free-format ASCII text file with two columns:
Time(seconds) and Amplitude(EU)
EU is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates fast Fourier transform given complex time history input.
The input and output data are in the same engineering units.
Usage: cfft [OPTIONS] STDIN STDOUT
OPTIONS:
-i = real and imag output
-h = print help message
STDIN:
The input file is a free-format ASCII text file with three columns:
Frequency(hz) and Amplitude (eu) and Amplitude (eu)
There may be more then one data set in the input file. Each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with three columns:
Frequency(hz) and [ amplitude (eu) and phase (radian) ] or [ real and imag ]
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program checks database array size matches array size parameter.
USAGE: checkdb STDIN STDOUT
STDIN:
The database file is a free-format ASCII text file.
GOOD/BAD scale x0 dx np flight channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec) or frequency
dx = delta time(sec) or frequency
np = number of amplitudes
flight = flight condition(integer number)
channel = accelerometer channel(integer number)
y = amplitude
STDOUT:
The output file is a ASSCI file.
number point parameter = number number of points in array = number
or for bad lines
number point parameter = number number of points in array = number error
This program calculates Samples per Second, Standard Deviation Sample Rate,
Number of samples, Signal duration, Maximum signal level, Minimum signal level,
Signal mean, Signal standard deviation, Signal skewness, Signal Kurtosis, Signal
excess Kurtosis, and Crest factor. This program also checks if the time history
is ascending.
USAGE: checkth [OPTION] STDIN STDOUT
OPTION
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
time(sec) and amplitude
There may be more then one data set in the input file
each data set is separated by 2 empty lines
STDOUT:
The outfile file is a free-format ASCII text file:
Samples per Second
Standard Deviation Sample Rate
Number of samples
Signal duration
Maximum signal level
Minimum signal level
Signal mean
Signal standard deviation
Signal skewness
Signal Kurtosis
Signal excess Kurtosis
Crest factor
There may be more then one data set in the output file. Each data set is
separated by 2 empty lines.
This program clips the amplitudes of a time history at a maximum level.
USAGE: clipth [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-f number = data clipping level
STDIN:
The input file is a free-format ASCII text file with two columns:
time (sec) and amplitude (eu)
There may be more then one data set in the input file. Each data set is separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
time (sec) and amplitude (eu)
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates ordinary coherence for two input channels.
Usage: cohere [OPTIONS] "Points per Segment" "Number of Averages" STDIN STDOUT
OPTIONS:
-m = remove mean from data
-a = calculate analysis parameters
-h = print help message
Points per Segment = number points per analysis segment
Number of Averages = number of segments to average
STDIN:
The input file is a free-format ASCII text file with three columns. The input
file can be created with program breadcd:
Frequency(hz), amplitude channel 1, amplitude channel 2
There may be more then one data set in the input file. Each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and coherence
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates cross spectral density for two input channels.
Usage: csd [OPTIONS] "Points per Segment" "Number of Averages" STDIN STDOUT
OPTIONS:
-m = remove mean from data
-a = calculate analysis parameters
-h = print help message
Points per Segment = number points per analysis segment
Number of Averages = number of segments to average
STDIN:
The input file is a free-format ASCII text file with three columns. The input
file can be created with program breadcd:
time, amplitude channel 1, amplitude channel 2
There may be more then one data set in the input file. Each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with four columns:
Frequency (hz) and Real part and Imag part and magnitude
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculate cubic spline curve fit to time series data.
USAGE: cspline [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-t number = delta time increment
default delta time increment = 0.01 seconds
STDIN:
The input file is a free-format ASCII text file with two columns:
time (sec) and amplitude (eu)
eu is engineering unit.
There may be more then one data set in the input file. Each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
time (sec) and amplitude (eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates cumulative rms for autospectral density sampled at even
delta frequency increments.
USAGE: cumrms [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency (hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file. Each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and cumulative RMS Amplitude (eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program combines sine dwell, sine sweep, and random vibration environments
into a final damage equivalent test level. The final equivalent test level can be
a sine dwell, sine sweep, or random test type.
Calculates dBA level for octave or third octave band sound pressure level data.
USAGE: dba [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency (hz) and SPL (dB)
dB is referenced to 0.00002 N/M^2
There may be more then one data set in the input file. Each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file
Sound pressure (dBA)
There may be more then one data set in the output file. Each data set is
separated by 2 blank lines.
This program applies a dB scale factor to input data file.
USAGE: dbfactor [OPTIONS] TYPE FACTOR STDIN STDOUT
OPTIONS
-h prints help message
-m apply - sign to factor
TYPE = spl to apply dB factor SPL spectra
TYPE = sine to factor sine(g's) spectra by factor dB
TYPE = psd to factor psd(g's) spectra by factor dB
FACTOR = in dB to apply to spectra
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz) or sine amplitude (g's) or SPL
eu is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz) or sine amplitude (g's) or SPL
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program decimates a time history by getting every other data point. Note
you should low pass data to avoid aliasing.
USAGE: desample [OPTIONS] STDIN STDOUT
OPTIONS
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time(seconds) and amplitude (eu)
eu is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time(seconds) and amplitude (eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program interpolates data dropouts in time history or psd data.
USAGE: dropout [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-p autospectral density file type (default file type is time history)
-f number = data level indicating dropout
large negative number for time history (default = -1000)
small positive number for autospectral density (default = 1.0E-18)
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) or time(sec) and amplitude (eu) or amplitude (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) or time(sec) and amplitude (eu) or amplitude (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates a endurance vibration envelope from a ASCII database
that contains flight test data.
USAGE: enddb [OPTIONS] conditions channels MISSIONS STDIN STDOUT
OPTIONS:
-h = print help message
STDIN:
The database file is a free-format ASCII text file.
GOOD/BAD scale_factor f0 df np flight channel psd...
GOOD/BAD = good or bad channel
scale = scale factor for psd
fo = starting frequency(hz)
df = delta frequency increment(hz)
condition = flight condition(integer number)
channel = accelerometer channel(integer number)
psd ... = autospectral density amplitudes for np analysis frequencies
MISSIONS:
Free-format ASCII text file in format.
hours condition 1 condition 2 ...
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
This program calculates endurance vibration envelope with constant Q smoothing from
ASCII database that contains the flight test data.
USAGE: %s [OPTION] flights channels missionfile STDIN STDOUT\n", prog);
[OPTIONS]
-h = print help message
-b = bandwidth increment in delta octave
default = 3 for third octave smoothing
-t = test duration in hours
default = 5 hours
-d = damping exponet
default = 2
-s = slope of fatigue curve
default = 5.68
STDIN:
The database file is a free-format ASCII text file.
GOOD/BAD f0 df np flight channel psd...
GOOD/BAD = good or bad channel
scale = scale factor for psd
fo = starting frequency(hz)
df = delta frequency increment(hz)
flight = flight condition(integer number)
channel = accelerometer channel(integer number)
psd ... = PSD amplitudes for np analysis frequencies
Input mission file:
The input file is a free-format ASCII text file.
hours flight1 flight2 ...
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(Hz) and PSD(EU^2/Hz)
EU is engineering unit.
This program calculates a envelope of vibration spectra.
USAGE: envel [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file.
Frequency(hz) and amplitude (eu) or autospectral density (eu^2/hz)
eu is engineering unit.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and amplitude (eu) or autospectral density (eu^2/hz)
eu is engineering unit.
This program calculates every spectral density given input time history.
Usage: esd [OPTIONS] "Points per Segment" averages STDIN STDOUT
OPTIONS:
-m = remove mean from data
-a = calculate analysis parameters
-h = print help message
Point per Segment = number points per analysis segment
averages = number of segments to average
STDIN:
The input file is a free-format ASCII text file with two columns:
Time (seconds) and Amplitude (eu)
eu is engineering unit
There may be more then one data set in the input file each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and energy spectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates level exceedances of a time history or a rainflow cycle
count.
USAGE: exceed [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-b number = number of bins
-x use xrange for histogram (default = yrange)
STDIN:
The input file is a free-format ASCII text file with 2 columns:
Time (sec) or rainflow range and amplitude (eu) or rain flow mean
eu = engineering unit
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
bin center point and bin count
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates fast Fourier transform given time history
input time history. The input and output data are in the same
engineering units.
Usage: fft [OPTIONS] STDIN STDOUT
OPTIONS:
-i = real and imag output
-h = print help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time(sec) Amplitude
There may be more then one data set in the input file
each data set in separated by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with three columns:
Frequency(Hz) "Amplitude and Phase or Real and Imag output"
There may be more then one data set in the output file.
Each data set in separated by 2 empty lines. This
file can be processed by gnuplot.
This program does fatigue life calculation given a rainflow cycle count. The
fatigue strength exponent and fatigue strength coefficient are input from the
command line.
USAGE: fstress [OPTIONS] "Fatigue Strength Coefficient" "Fatigue Strength Exponent" STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Range Count and Mean Count
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
life in blocks
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates transfer function of single degree of freedom system.
USAGE: gain STDOUT
Input to this program is Interactive.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Gain
This program generates a sinusoidal signal.
USAGE: gsine td sr freq amp [OPTION] STDOUT
td = time duration
sr = sample rate
freq = frequency
amp = amplitude
OPTIONS
-h prints help message
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time(sec) Amplitude(eu)
eu is engineering unit.
This program generates a white noise signal.
USAGE: gwhite td sr mean stddev [OPTION] STDOUT
td = time duration
sr = sample rate
mean = mean of signal
stddev = standard deviation of signal
OPTIONS
-h prints help message
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time(sec) Amplitude(eu)
eu is engineering unit.
This program applies a Hanning window to spectra.
Usage: hann [OPTIONS] STDIN STDOUT
-h = print help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency (hz) and autospectral density (eu^2/hz)
There may be more then one data set in the input file each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates histograms. Calculates a normal distribution function
for comparison by using the -p command line switch.
USAGE: histogram [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-b number = number of bins
-p calculate density
-x use xrange for histogram(default = yrange)
STDIN:
The input file is a free-format ASCII text file with 2 columns:
Time (sec) or rainflow range and amplitude (eu) or rain flow mean
eu = engineering unit
There may be more then one data set in the input file
each data set in separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two or three columns:
bin center point and ( bin count and normal distribution for -p switch )
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates butterworth high-pass filter of time history.
USAGE: hpf [OPTIONS] "Frequency Cutoff" "Sample Rate" STDIN STDOUT
OPTIONS:
-h prints help message
Frequency Cutoff = high-pass frequency
Sample Rate = sample rate for time history
STDIN:
The input file is a free-format ASCII text file with two columns:
Time (sec) and Amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time (sec) and Amplitude (eu)
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates inverse fast Fourier transform. The input and output
data are in the same engineering units.
Usage: ifft [OPTIONS] STDIN STDOUT
OPTIONS:
-h = print help message
STDIN:
The input file is a free-format ASCII text file with three columns:
Frequency(Hz) Real_Magitude Imag_Magitude
There may be more then one data set in the input file
each data set in separated by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with three columns:
Time(sec) Real_Magitude Imag_Magitude
There may be more then one data set in the output file.
Each data set in separated by 2 empty lines. This
file can be processed by gnuplot.
Calculate log-log plot parameters for amplitude spectra plotted as straight
lines on log-log coordinates. Slopes are calculated in dB/octave. dB is
defined as 20*log10(A2/A1) for amplitude spectra.
USAGE: ilpa [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
To calculate Amplitude 2 input: 0 slope(dB/octave) freq1 amp1 freq2
To calculate Frequency 2 input: 1 slope(dB/octave) freq1 amp1 amp2
To calculate Frequency 1 input: 2 slope(dB/octave) amp1 freq2 amp2
To calculate Amplitude 1 input: 3 slope(dB/octave) freq1 freq2 amp2
To calculate slope(dB/octave) input: 4 freq1 amp1 freq2 amp2
STDOUT:
The output file is a free-format ASCII text file with five columns:
Freq 1 and Amplitude 1 and Freq 2 and Amplitude 2 and Slope (dB/Octave)
USAGE: ilpp [OPTIONS] STDIN STDOUT
Calculate log-log plot parameters for power spectra plotted as straight lines on
log-log coordinates. Slopes are calculated in dB/octave. dB is defined as
10*log10(P2/P1) for power spectra.
OPTIONS:
-h prints help message
STDIN:
To calculate Amplitude 2 input: 0 slope(dB/octave) freq1 amp1 freq2
To calculate Frequency 2 input: 1 slope(dB/octave) freq1 amp1 amp2
To calculate Frequency 1 input: 2 slope(dB/octave) amp1 freq2 amp2
To calculate Amplitude 1 input: 3 slope(dB/octave) freq1 freq2 amp2
To calculate slope(dB/octave) input: 4 freq1 amp1 freq2 amp2
STDOUT:
The output file is a free-format ASCII text file with five columns:
Freq 1 and Amplitude 1 and Freq 2 and Amplitude 2 and Slope (dB/Octave)
This program interpolates autospectral density on log-log coordinates to integer
number of delta autospectral density input spectra points. Note this program
does not change the frequency resolution of the autospectral density, it just
re-samples at a difference frequency spacing.
USAGE: int [OPTIONS] STDIN STDOUT
OPTIONS
-h prints help message
-f number = delta interpolation increment
default delta interpolation increment = 1 hertz
-l number = lower freq extrapolation limit
-u number = upper freq extrapolation limit
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set is
separated by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
Each data set in separated by 2 empty lines. This file can be processed by
gnuplot.
This program interpolates amplitude data plotted on log-log coordinates to third
octave band frequencies. Amplitude data can be sine(g's), psd(g^2/hz), or
mobility.
USAGE: intampthird [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and amplitude (eu) or amplitude (eu) or spectra (eu^2/hz) or mobility
There may be more then one data set in the input file. Each data set in separated
by 2 blank lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and amplitude (eu) or amplitude (eu) or spectra (eu^2/hz) or mobility
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program does integration of time history data.
USAGE: integ [OPTION] SCALE STDIN STDOUT
SCALE = scale factor for time history data.
Use 386.1 to scale accel in g's to inches/seconds^2 before integration
to get velocity in in/second
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time(seconds) and Amplitude(EU)
EU is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time(seconds) and Amplitude(EU)
EU is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program interpolates octave band SPL data to standard octave band frequencies
USAGE: intspl2octave [OPTIONS] STDIN STDOUT
OPTIONS
-h prints help message
-l number = lower freq extrapolation limit
-u number = upper freq extrapolation limit
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
USAGE: intspl2old [OPTIONS] STDIN STDOUT
This program interpolates octave band sound pressure level data to data to old
sound pressure level octave band frequencies
OPTIONS
-l number = lower freq extrapolation limit
-u number = upper freq extrapolation limit
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program interpolates sound pressure level data to third octave band
frequencies.
USAGE: intspl2third [OPTIONS] STDIN STDOUT
OPTIONS
-h prints help message
-l number = lower freq extrapolation limit
-u number = upper freq extrapolation limit
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
Calculate Joint acceptance for reverberent noise on plate with simple supports.
USAGE: jarev [OPTIONS] STDIN STDOUT
STDIN:
The output file is a free-format ASCII text file with four columns:
Altitude(ft) and mode number and length x and length y
OPTIONS
-h prints help message
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Joint Acceptance
Calculate Longitudinal Joint acceptance upstream of protuberance for simple support beam per Wyle report 71-10 Equation 39.
USAGE: joint [OPTIONS] STDIN STDOUT
OPTIONS
-h prints help message
STDIN:
Calculate given Mach use: "Mach" altitude(ft) Mach mode length_streamwise
Calculate given keas use: "keas" altitude(ft) keas mode length_streamwise
Calculate given ktas use: "ktas" altitude(ft) ktas mode length_streamwise
Calculate given kcas use: "kcas" altitude(ft) kcas mode length_streamwise
Notes:
First entry is a string that defines the type of airspeed information to entry.
mode is number of half waves
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Joint Acceptance
Calculation of Joint acceptance for progressive wave on simply supported beam.
USAGE: %s [OPTIONS] STDIN STDOUT\n", prog);
OPTIONS
-h prints help message
STDIN:
The input file is a free-format ASCII text file with 3 columns:
Altitude(ft) \"Axial mode half waves\" Lenght_X
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(Hz) and Joint Acceptance
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program applies a 6 order Butterworth low pass filter to a time history.
USAGE: lpf [OPTIONS] "Low Pass Frequency" "Time HistorySample Rate" STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time (sec) and Amplitude (eu)
eu = engineering units
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time (sec) and Amplitude (eu)
eu = engineering units
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
Remove linear trend from time history.
USAGE: ltrend [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
time(sec) and amplitude(eu)
eu is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
time(sec) and amplitude(eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates a composite condition and channel envelope from a ASCII
database that contains the test data. The condition and channel envelopes
are the ones that define the maximum envelopes of the composite plotted
vibration data.
USAGE: maxfc [OPTIONS] conditions channels STDIN STDOUT
OPTIONS:
-h = help message
STDIN:
The database file is a free-format ASCII text file.
GOOD/BAD scale f0 df np condition channel psd...
GOOD/BAD = good or bad channel
scale = scale factor for psd
fo = starting frequency(hz)
df = delta frequency increment(hz)
condition = condition (integer number)
channel = accelerometer channel(integer number)
psd ... = autospectral density amplitudes for np analysis frequencies
Note conditions and channels are input using a colon operator to
for example:
1,2,10:15,6 would expand to 1,2,10,11,12,13,14,15,6
STDOUT:
The output file is a free-format ASCII text file with three columns:
Frequency(hz) and Condition and Channel
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates a endurance vibration envelope.
USAGE: nocal [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with n data blocks as:
segment duration in Hours
Frequency(hz) and autospectral density(g^2/hz)
. .
. .
. .
Each data block in separated by 2 blank lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
This file can be processed by gnuplot.
This program normalizes time history to start at zero time. Default is to
subtract offset from time values.
USAGE: normth [OPTIONS] STDIN STDOUT
OPTIONS:
-t calculate time values t = 0+i*dt
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time(sec) and Amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set is
separated by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time(sec) and Amplitude (eu)
eu = engineering unit
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates log normal tolerance limits.
USAGE: ntl [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-b is beta the percentile limit, default = 95%
possible values are 90%, 95%, and 99%
-g is gama the confidence coefficient, default = 0.50
possible values are 50%, 75%, and 90%
STDIN:
The input file is a free-format ASCII text file.
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
This program calculates overall sound pressure level.
USAGE: oaspl [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL(dB)
There may be more then one data set in the input file each data set is
separated by 2 empty lines
STDOUT:
OASPL
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program converts octave band sound pressure levels to autospecral density.
USAGE: oct2psd [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and octave band sound pressure levels
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program multiplies complex data in real - imag format by i*omega.
Usage: omathdiff [OPTIONS] STDIN STDOUT
OPTIONS:
-h = print help message
STDIN:
The input file is a free-format ASCII text file with three columns:
Frequency(Hz) real imag
There may be more then one data set in the input file each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with three columns:
Frequency(Hz) real imag
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program packs a ASCII database into a binary database.
USAGE: packdb conditions channels STDIN STDOUT
conditions = list of flight conditions to pack to binary database
channels = list of channel numbers to pack to binary database
flight or channel ranges are separated by colon's
for example: 100,101:105,110
expands to: 100 101 105 106 107 108 109 110
STDIN:
The database file is a free-format ASCII text file.
GOOD/BAD scale x0 dx np flight channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec) or frequency
dx = delta time(sec) or frequency
np = number of amplitudes
flight = flight condition(integer number)
channel = accelerometer channel(integer number)
y = amplitude
STDOUT:
The output database file is a binary file.
GOOD/BAD scale x0 dx np flight channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec) or frequency
dx = delta time(sec) or frequency
np = number of amplitudes
flight = flight condition(integer number)
channel = accelerometer channel(integer number)
y = amplitude
This program locates minimum and maximum peaks of time histories
USAGE: peaks [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time (sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time (sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates the minimum, average, and maximum envelope of a set of vibration spectra.
USAGE: envel [OPTION] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file.
Frequency(Hz) and PSD(EU^2/Hz)
EU is engineering unit.
STDOUT:
The output file is a free-format ASCII text file with four columns:
Frequency(Hz) minimum PSD(EU^2/Hz) average PSD(EU^2/Hz) maximum PSD(EU^2/Hz)
EU is engineering unit.
Calculation of modal mass for plate with simple supports.
USAGE: %s [OPTIONS] STDIN STDOUT\n", prog);
OPTIONS
-h prints help message
STDIN:
The input file is a free-format ASCII text file with 3 columns:
"Mass per unit area" Lenght_X Lenght_Y
STDOUT:
The output file is a free-format ASCII text file:
Modal Mass
Convert autospectral density of pressures to sound pressure response.
USAGE: psd2spr [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-q damping Q value
default damping Q = 10
-b pressure coupling factor
default coupling factor Beta = 2
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (psi^2/hz)
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Sound Pressure Response (psi)
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates autospectral density response for a single degree of freedom system
relative to a inertial reference frame fixed to earth given a autospectral density base motion
input autospectral density spectra.
USAGE: psdresponse [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-f number = natural frequency
default natural frequency = 100 hertz
-q number = system gain
default system gain = 10
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu = engineering unit.
There may be more then one data set in the input file, each data set in
separated by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program does rainflow cycle counting. Input file must be arranged to begin
with the maximum peak for this program. Use the program rfsetup to preprocess
the data for the rainflow count. The rfsetup program will
arrange the data to begin with the maximum peak.
USAGE: rainflow [OPTIONS] STDIN STDOUT
OPTION
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time (sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Range and Mean
There may be more then one data set in the output file. Each data set is
separated by 2 empty lines.
Usage: ranpan "interactive input" STDOUT
This program calculates random panel response to acoustic pressure
Reference: R. H. Lyon and R. G. DeJong, "Theory and application of statistical
energy analysis," Butterworth-Heinemann, Boston, 1995
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency (hz) and autospectral density (g^2/hz)
Read time history or autospectral density data from ASCII database.
USAGE: readdb FLIGHTS CHANNELS STDIN STDOUT
FLIGHTS = list of flight conditions to parse from database
CHANNELS = list of channel numbers to parse from database
Note conditions and channels are input using a colon operator to
for example:
1,2,10:15,6 would expand to 1,2,10,11,12,13,14,15,6
Database format:
GOOD/BAD scale x0 dx np flight channel y ...
STDIN:
The database file is a free-format ASCII text file.
GOOD/BAD scale x0 dx np flight channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec) or frequency
dx = delta time(sec) or frequency
np = number of amplitudes
flight = flight condition(integer number)
channel = accelerometer channel(integer number)
y = amplitude
STDOUT:
The output file is a free-format ASCII text file with two columns:
time(sec or frequency) and amplitude(eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program reads sound pressure data from ASCII database
USAGE: readspl [OPTIONS] BAND FLIGHTS CHANNELS STDIN STDOUT
OPTIONS:
-h = help
BAND = Data type: 1 = octave band,0 = old octave band, 3 = third octave band
Flights = list of conditions to parse from database
Channels = list of channel numbers to parse from database
Note conditions and channels are input using a colon operator to
for example:
1,2,10:15,6 would expand to 1,2,10,11,12,13,14,15,6
STDIN:
The database file is a free-format ASCII text file.
GOOD/BAD dbscale x0 dx np flight channel y ...
GOOD/BAD = mark data as good or bad
dbscale = dB factor to apply to data
x0 = starting frequency(hz)
np = number of frequencies
flight = flight condition(integer number)
channel = channel(integer number)
y = SPL amplitude
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL(dB)
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates autospectral density response spectra for a single degree of freedom
system relative to a inertial reference frame fixed to the base of the system
given a autospectral density base motion input autospectral density spectra.
USAGE: relpsdresponse [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-f number = natural frequency
default natural frequency = 100 hertz
-q number = system gain
default system gain = 10
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu = engineering unit.
There may be more then one data set in the input file, each data set in separated by 2 empty lines.
Output File:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density (eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates relative random response spectra given autospectral
density base input spectra. Response is calculated relative to a axis fixed to
the base on the system.
USAGE: relrs [OPTIONS] STDIN STDOUT
OPTIONS:
-q number = damping
default damping = 10
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Amplitude(eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program arranges time history for simplified rainflow counting by
rearranging so that time history begins with maximum peak. Data should be
preconditioned with program "peaks" to remove data points between peaks. This
data can be processed with program rainflow to do the cycle counting.
USAGE: rfsetup [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time (sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file
each data set is separated by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time (sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program removes mean from time history.
Usage: rmean [OPTIONS] STDIN STDOUT
OPTIONS:
-h = print help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time(sec) and Amplitude(eu)
eu is engineering unit.
There may be more then one data set in the input file each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time(sec) and Amplitude(eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates root mean square of a autospectral spectral density sampled at
small even delta frequency increments using trapezoidal integration.
USAGE: rms [OPTIONS] STDIN STDOUT
OPTIONS
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu = engineering unit.
There may be more then one data set in the input file each data set in
separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file:
RMS(eu)
eu = engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines.
Calculate RMS in octave bands from input autospectral density.
USAGE: rmsoctave [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file
each data set in separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and RMS(eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates RMS for time history.
USAGE: rmsth [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and amplitude(eu)
eu is engineering unit.
There may be more then one data set in the input file
each data set in separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file
RMS
There may be more then one data set in the output file.
Each data set in separated by 2 blank lines. This
file can be processed by gnuplot.
This program calculates rms level in third octave bands.
USAGE: rmsthird [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-s scale RMS(G's) to RMS(M^2/sec) for comparison to MIL-STD-1472 criteria
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and RMS(eu)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program estimates standard deviation of stress response in structure
USAGE: rstress STDOUT
Interactive input
STDOUT:
The output file is a free-format ASCII text file:
Standard Deviation Stress = fn
This program scales autospectral density data file scaled in measurement units to
engineering units
USAGE: scale [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with a header line and two columns:
Header line:
X1, X2, dX, Y1, Y2, dY
X1 = x axis lower limit
X2 = x axis upper limit
dX = x axis length in measurement units
Y1 = y axis lower limit
Y2 = y axis upper limit
dY = y axis length in measurement units
Data:
Frequency(MU) and autospectral density(MU)
MU = measurement units
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program scales SPL data file scaled in measurement units to
engineering units
USAGE: scaledb [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with a header line and two columns:
Header line:
X1, X2, dX, Y1, Y2, dY
X1 = x axis lower limit
X2 = x axis upper limit
dX = x axis length in measurement units
Y1 = y axis lower limit
Y2 = y axis upper limit
dY = y axis length in measurement units
Data:
Frequency(MU) and autospectral density(MU)
MU = measurement units
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL(dB)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program applies a scale factor to input data file.
USAGE: sfactor [OPTIONS] factor STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates separated flow power spectral density based on data from
Wyle laboratories report 70-10 Equation 10.
USAGE: sflow10 [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
Input is one of the following options.
"mach" altitude(ft) mach "distance from leading edge" "RMS pressure / dynamic pressure"
"keas" altitude(ft) keas "distance from leading edge" "RMS pressure / dynamic pressure"
"ktas" altitude(ft) ktas "distance from leading edge" "RMS pressure / dynamic pressure"
"kcas" altitude(ft) kcas "distance from leading edge" "RMS pressure / dynamic pressure"
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(psi^2/hz)
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates attached flow power spectral density based on data from
Wyle laboratories report 70-10.
USAGE: sflow10 [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
Input is one of the following options.
"mach" altitude(ft) mach "distance from leading edge"
"keas" altitude(ft) keas "distance from leading edge"
"ktas" altitude(ft) ktas "distance from leading edge"
"kcas" altitude(ft) kcas "distance from leading edge"
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(psi^2/hz)
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates separated flow power spectral density based on data from
Wyle laboratories report 70-10 Equation 43.
USAGE: sflow10 [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
Input is one of the following options.
"mach" altitude(ft) mach "diameter of protuberance" "RMS pressure / dynamic pressure"
"keas" altitude(ft) keas "diameter of protuberance" "RMS pressure / dynamic pressure"
"ktas" altitude(ft) ktas "diameter of protuberance" "RMS pressure / dynamic pressure"
"kcas" altitude(ft) kcas "diameter of protuberance" "RMS pressure / dynamic pressure"
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(psi^2/hz)
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program generates a half sine or terminal sawtooth shock pulse time history.
half sine pulse is default
USAGE: shockth [OPTIONS] STDOUT
-h prints help message
-s terminal sawtooth pulse: default is a half sine pulse
-d number = pulse duration
default duration = 0.011 seconds
-g number = pulse level
default level = 15 g
Calculates SIL level for octave octave band sound pressure level
data.
USAGE: sil [OPTIONS] STDIN STDOUT
OPTIONS:
-c = common octane bands 848, 1696, and 3392 hertz
-t = three band method 500, 1000, and 2000 hertz
default is 500, 1000, 2000, and 4000 hertz bands
-h prints help message
Calculates SIL level.
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and SPL
eu is engineering unit.
There may be more then one data set in the input file
each data set in separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file
SIL
There may be more then one data set in the output file.
Each data set in separated by 2 blank lines.
This program applies constant Q smoothing to autospectral density.
USAGE: smooth [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-b fractional octave: default third = 3
6 would be sixth octave ...
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates spl level in octave bands from pressure
autospectral density data.
USAGE: sploctave [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(psi^2/hz)
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and spl in octave bands
reference 2.9e-9 psi
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates spl level in third octave bands from pressure
autospectral density data.
USAGE: splthird [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(psi^2/hz)
There may be more then one data set in the input file each data set in
separated by 2 blank lines
Output File:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and spl in third octave band
reference 2.9e-9 psi
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program scales random vibration test spectra for test duration and total mission
profile duration
USAGE: interactive
This program calculates shock response spectra. The calculated acceleration is
referenced to a frame of fixed to earth.
USAGE: srsa [OPTIONS] STDIN STDOUT
OPTIONS:
-q = damping
default damping of Q = 10
-f = starting frequency
default = 10 hz
-d = delta frequency
default = 1/20 octave increment
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and Amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Amplitude (eu)
eu = engineering unit
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates equivalent static acceleration shock response spectra.
Reference:
Kelly, R.D. and Richman, G., \"Principles and Techniques of Shock Data Analysis\",
The Shock and Vibration Information Center, pages 145-146
USAGE: srse [OPTIONS] STDIN STDOUT
OPTIONS:
-h = help
-r = calculate relative deflection response(inches)
-g = factor to normalize acceleration by gravity
default = 386.1
-q = damping
default damping of Q = 10
-f = starting frequency
default = 10 Hz
-d = octave increment for analysis frequencies
default = 1/24 octave increment
enter increment as X to get 1/X frequency spacing
STDIN:
The input file is a free-format ASCII text file with two columns:
time(sec) and amplitude(g's)
There may be more then one data set in the input file
Each data set in separated by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(Hz) and Response(g's)
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates shock response spectra given a force shock pulse input.
USAGE: srse [OPTIONS] STDIN STDOUT
OPTIONS:
-h = help
-m = replace default mass
default mass = unit mass
-q = damping
default damping of Q = 10
-g = factor to normalize acceleration by gravity
default = 386.1
-f = starting frequency
default = 10 Hz
-d = octave increment for analysis frequencies
default = 1/24 octave increment
enter increment as X to get 1/X frequency spacing
STDIN:
The input file is a free-format ASCII text file with two columns:
time(sec) and amplitude(force)
There may be more then one data set in the input file
Each data set in separated by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with 4 columns:
Frequency(Hz) Displacement Velocity Acceleration
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program converts sound spectra level (referenced to 2.9e-9 psi squared) to
power spectra density (psi^2/hz).
USAGE: ssl2psd [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and SSL(dB)
eu is engineering unit.
There may be more then one data set in the input file
each data set is separated by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(psi^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program converts third octave SPL data octave bands SPL.
USAGE: third2octave [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and third octave SPL
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and octave SPL
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program converts a third octave SPL to a autospectral density
USAGE: third2psd [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and third octave SPL
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates running RMS level for input time history.
USAGE: rmsth tr to [OPTION] STDIN STDOUT
tr = lenght of RMS analysis time slice in seconds
to = RMS time slice overlap in seconds
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(Hz) and amplitude(EU)
EU is engineering unit.
There may be more then one data set in the input file
each data set in separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
time RMS
There may be more then one data set in the output file.
Each data set in separated by 2 blank lines. This
file can be processed by gnuplot.
This program splits a time history into segments.
USAGE: thsplit [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
-s input segment size default = 2048
STDIN:
The input file is a free-format ASCII text file with two columns:
time(sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
time(sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
Time reverse time series on time axis. Can be used with programs lpf and hpf to
do phase correction for filtering operation.
USAGE: timer [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
time(sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
time(sec) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program truncates autospectral density data file to power of 2.
USAGE: tp2 [OPTIONS] STDIN STDOUT
OPTIONS
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file:
Frequency(hz) and amplitude (eu)
eu = engineering unit
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines.
This program calculates transfer function of time history for two input channels.
Usage: transfun [OPTIONS] Points per Segment" averages STDIN STDOUT
Points per Segment = number points per analysis segment
averages = number of segments to average
OPTIONS:
-m = remove mean from data
-a = calculate analysis parameters
-h = print help message
STDIN:
The input file is a free-format ASCII text file with three columns:
Frequency(hz) and Amplitude(eu) and Amplitude(eu)
eu = engineering unit
There may be more then one data set in the input file each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and Gain
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program calculates sound transmission loss for a panel per "Frank Fahy,
"sound and Structural vibration radiation, transmission and response," equation
4.38b.
USAGE: interactive
This program selects time slice from time history file.
USAGE: tslice [OPTIONS] "starting time" "ending time" STDIN STDOUT
OPTIONS
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Time(sec) and Amplitude(eu)
eu is engineering unit.
There may be more then one data set in the input file each data set is separated
by 2 empty lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Time(sec) and Amplitude(eu)
eu is engineering unit.
There may be more then one data set in the input file
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
Unpacks binary time history or autospectral density database to ASCII database.
USAGE: unpackdb STDIN STDOUT
STDIN:
The database file is a binary database file.
GOOD/BAD scale x0 dx np flight channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec) or frequency
dx = delta time(sec) or frequency
np = number of amplitudes
flight = flight condition(integer number)
channel = accelerometer channel(integer number)
y = amplitude
STDOUT:
The database file is a ASCII database file.
GOOD/BAD scale x0 dx np flight channel y ...
GOOD/BAD = mark data as good or bad
scale = scale factor to apply to data
x0 = starting time(sec) or frequency
dx = delta time(sec) or frequency
np = number of amplitudes
flight = flight condition(integer number)
channel = accelerometer channel(integer number)
y = amplitude
List descriptions of programs in vibtoolbox package.
USAGE: interactive
This program transforms velocity autospectral density to displacement autospectral density
USAGE: vsddsd [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(ips^2/hz)
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(inch^2/hz)
Calculated displacement is 0 to peak
eu is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program calculates zero crossings with positive slope from autospectral density input spectra.
USAGE: zerocross [OPTIONS] STDIN STDOUT
OPTIONS:
-h prints help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(hz) and autospectral density(eu^2/hz)
eu is engineering unit.
There may be more then one data set in the input file each data set in separated
by 2 blank lines
STDOUT:
The output file is a free-format ASCII text file.
zero crossing frequency in hz
There may be more then one data set in the output file. Each data set in
separated by 2 blank lines. This file can be processed by gnuplot.
This program adds an array of zeros to each end of a PSD or time history
The input and output data are in the same engineering units.
Usage: zerofill [OPTIONS] pointsSegment averages STDIN STDOUT
OPTIONS:
-z = number zero fill points to add
-h = print help message
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(Hz) or seconds and PSD(EU^2/hz) or g's
There may be more then one data set in the input file each data set in separated
by 2 empty lines.
STDOUT:
The output file is a free-format ASCII text file with two columns:
Frequency(Hz) or seconds and PSD(EU^2/hz) or g's
EU is engineering unit.
There may be more then one data set in the output file. Each data set in
separated by 2 empty lines. This file can be processed by gnuplot.
This program converts a output file in gnuplot format to vibtoolbox ASSCI
database file format.
USAGE: %s [OPTION] STDIN STDOUT\n",prog);
OPTIONS:
-h prints help message
-i use slice index number in place of channel number
STDIN:
The input file is a free-format ASCII text file with two columns:
Frequency(Hz) or Time and power spectral density(eu**2/Hz) or amplitude(eu)
eu is engineering unit.
There may be more then one data set in the input file
each data set in separated by 2 blank lines
STDOUT:
The output file is a free-format ASCII database file