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Its had this resonance issue since we got it. I was able to recreate the shaker armature and perform FEA on it. I believe the resonant mode in question is a swaying/twisting motion of the armature. I can't think of a way to stiffen/dampen this mode through any changes to the fixture on top.

I have run tests with the bare table only. Its resonance is ~2150 Hz. I believe adding our fixture decreases it to 1975 Hz.

Fairly flimsy, it is only 0.75" thick. However, its first resonant mode is around ~3000Hz (simulated).

Hello, I am trying to conduct random vibration testing using a electrodynamic shaker table. In testing there is a resonance (~1975 Hz), caused by the shaker assembly itself, within the the desired spectrum (10-2000 Hz). This resonance cannot be controlled and is preventing our response PSD from...