Vibration Comparison
Vibration Comparison
(OP)
I'm an ME that has very limited experience in vibration analysis. I was recently handed a project to evaluate the effectiveness of a vibration damping mount.
We had two tests done to the UUT per MIL-STD-810F(Fig 514.5C-1). The first test had the UUT mounted directly to the shaker table. The second test had the UUT mounted to the vibration damping mount, which was mounted directly to the shaker table.
All in all, I got 6 sets of data (3 axes with vibe mount, 3 axes without). The plots I got were in g^2/hz as a function of hz. Also included in each chart is a g(rms) value. It is my understanding that this value is the area under this curve. Is that correct? Also, is the relationship between the g(rms) values a good indicator of the effectiveness of the mount? For example, one axis had a value of 2.70 g(rms) without the mount and 1.66 g(rms) with the mount. Can I use these numbers as a valid comparison to present to others? Thank you.
We had two tests done to the UUT per MIL-STD-810F(Fig 514.5C-1). The first test had the UUT mounted directly to the shaker table. The second test had the UUT mounted to the vibration damping mount, which was mounted directly to the shaker table.
All in all, I got 6 sets of data (3 axes with vibe mount, 3 axes without). The plots I got were in g^2/hz as a function of hz. Also included in each chart is a g(rms) value. It is my understanding that this value is the area under this curve. Is that correct? Also, is the relationship between the g(rms) values a good indicator of the effectiveness of the mount? For example, one axis had a value of 2.70 g(rms) without the mount and 1.66 g(rms) with the mount. Can I use these numbers as a valid comparison to present to others? Thank you.





RE: Vibration Comparison
Good luck.
RE: Vibration Comparison
Regards
Dave
RE: Vibration Comparison
Some basic aspects to consider:
- no resonance in the resiliently mounted instlalation.
- Displacements within certain specified tolerances (which can be altererd by changing stiffness of the support.
- Allowable displacements during transients.
RE: Vibration Comparison
RE: Vibration Comparison
The mean thing is: avoid resonance by tuning mounts and possible exciting forces.