VibrationVIEW Help
189
© 1995-2005 Vibration Research Corporation. All rights reserved.
frequency. The frequency range used for SRS analysis will be from a lower frequency of 100/(Pulse
Duration in ms) to up to half of the sample rate.
Tip:
To force the analysis to a certain set of frequencies, check the "Analyze only at breakpoint freq"
box, and enter the desired analysis frequencies in the SRS Breakpoints list. When that box is
checked, only the frequencies listed in the SRS Breakpoints list will be used for SRS analysis.
The
SRS Synthesis
parameters are used to synthesize a pulse to match a specified SRS curve.
Select the type of pulse with the
Synthesis Type
selection box. The
Pulse Duration
should be longer
than the period of the lowest frequency in the SRS specification and optimally should be about 10
times as long. The
Sample Rate
should be at least 4 times the highest frequency in the SRS
specification and optimally should be 10 times the highest frequency.
The
Start Frequency
and
End Frequency
parameters control the chirp (frequency sweep) and burst
random synthesis methods.
For frequency sweeps, to sweep up in frequency, set the
End Frequency
higher than the
Start
Frequency
. To sweep down in frequency, set the
End Frequency
lower than the
Start Frequency
.
The lower frequency should be one tenth of the lowest frequency in the SRS specification and the
higher frequency should be double the highest frequency in the SRS specification.
For burst random, the
Start Frequency
should be equal to or greater than the lowest frequency in the
SRS specification and the
End Frequency
should be equal to or less than the highest frequency in the
SRS specification.
After you have entered the SRS specification and synthesis parameters, press the
Synthesize
button
to synthesize a pulse to meet the specification. The synthesis uses an iterative technique so each time
you click the
Iterate more
button, the SRS of the synthesized pulse will get closer to the specified
curve. Press the
Synthesize
button to restart the synthesis with a new set of parameters.
To see the synthesized acceleration, velocity and displacement curves, select the "Accel", "Vel" or
"Disp" radio buttons under the bottom left corner of the graph. The "SRS" button will restore the SRS
Profile Definition graph.
ZPA = Zero Period Acceleration
For SRS, this is the absolute peak acceleration during the pulse. This can be found as either the
Control Peak acceleration value, or on the SRS plot it will be the asymptotic value of the plot at high-
frequency.
4.5
Field Data Replicator Test Definition
4.5.1
Playback tab
Field Data Replicator Playback dialog box
menu command, while a Field Data Replicator test is open, to
display this dialog.
110
Summary of Contents for VibrationVIEW
Page 15: ...Document Revision Part I ...
Page 17: ...How To Part II ...
Page 96: ...Menu commands Part III ...
Page 142: ...Test Definition Part IV ...
Page 217: ...Control Centers Part V ...
Page 227: ...Accelerometer Toolbars Part VI ...
Page 231: ...Stop Codes Part VII ...
Page 263: ...Typical Views Part VIII ...
Page 268: ...VibrationVIEW Help 255 1995 2005 Vibration Research Corporation All rights reserved ...
Page 269: ...Dialog Boxes Part IX ...
Page 303: ...Windows Elements Part X ...
Page 309: ...APPENDIX Part XI ...
Page 311: ...APPENDIX 298 1995 2005 Vibration Research Corporation All rights reserved ...