The critical characteristics of an impact are its duration, distribution and intensity. Isolating an impact converts it from a short-term high-amplitude impulse into one which lasts longer but only carries a small fraction of the original force. In contrast to the periodically-actuated vibrations, the isolated system vibrates in the resonant frequency of the insulated machine and not according to its rotational speed. The remaining impulses transmitted by the insulators drop in intensity as the resonant impulse duration rises and the resonant frequency of the insulated machine drops.
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