Manufacturers of anti-vibration mounts usually offer machine mounts with varying natural frequencies, to eliminate the excitation frequency of the machine, versus the natural frequency of the anti-vibration mount. Vibration technology differentiates between two types of oscillation signatures. Sinusoidal oscillation of working equipment produces a predictable vibration signature. Sinusoidal oscillations occur on generators, compressors and blowers, which require a soft RAV D mount, whereas, shocks or impacts produce a non-predictable signature. For mixers, crushers, punching presses and shears, a RAV mount would be prefered.
Dampening effect is related to the proportion of the relevant acoustic resistance to acoustic velocity, and the material density. Typically, the ideal amount of isolation of solid-born noise can be expected through the entire frequency range with a rubber-steel mount combination.
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The Timken Company.