I am working on selection of vibration isolators for one of our electrical cabinets which would be subjected to Sine sweep vibration test from 3 to 100 Hz (1 octave/ min for 2.5 hours) with peak acceleration of 0.7g(see attached pic for test plot).For preliminary analysis, I have selected 4 neoprene floor mounts (Grainger part# 4C988)and determined the natural frequency to be about 4.95 Hz. When I calculated the transmissibility (Q), I found that the max. Q of 50.4 is observed at resonant frequency 4.95 Hz (See attached excel sheet). Therefore, an input acceleration of 0.15 g is amplified to 7.5 g ( 50.4 X 0.15 g) at resonant frequency- kindly correct if my understanding is correct?
This brings to my next question, if Neoprene (damping ratio-0.05) is not sufficient, what other rubber materials I could use for my application. I had found that Butyl Rubber's damping ratio is about 0.2 which would be really good for my application but I am having hard time to find a vendor. If anyone can suggest vendors that would be great.