Relative displacements during random vibration
Relative displacements during random vibration
(OP)
Hi,
I need help regarding test setup for determining relative displacements using accelerometers at two locations during random vibration.
We had done this before about 6 years back but I have forgotten the details.
1. Install two accelerometers at two locations
2. Take output from the two accelerometers to charge amplifier/summer to get the difference
3. Retrieve PSD v/s frequency data and then double integrate to get the relative displacement PSD v/s frequency at the two locations. Then calculate rms displacements.
Is this correct?
Thanks in advance for your help.
Regards,
- NaikD
I need help regarding test setup for determining relative displacements using accelerometers at two locations during random vibration.
We had done this before about 6 years back but I have forgotten the details.
1. Install two accelerometers at two locations
2. Take output from the two accelerometers to charge amplifier/summer to get the difference
3. Retrieve PSD v/s frequency data and then double integrate to get the relative displacement PSD v/s frequency at the two locations. Then calculate rms displacements.
Is this correct?
Thanks in advance for your help.
Regards,
- NaikD





RE: Relative displacements during random vibration
Usual provisos apply, double integration is not straightforward. If you are using B&K 2635 charge amps read the instruction manual it is quite informative on this.
Cheers
Greg Locock
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