The effectiveness of vibration isolation depends to a great extent on the relationship between the rotational speed of the machine and the natural frequency of the insulator (damping ratio). In general it is true that the effectiveness of vibration isolation rises as the natural frequency of the insulator drops, that is, as the ratio between the frequency of the vibration (rotational speed of the machine) and the natural frequency of the insulator rises. The curve below shows that isolation only starts to occur when this ratio exceeds 2. If the ratio is less than 2, the vibration may easily be amplified or strengthened. Typically, the objective is to achieve a ratio of between 3 and 4. A ratio of 3 is considered to be the lowest effective value, a ratio of 4 to be an economic limit. A ratio of greater than 4 cannot be justified on economic grounds, as the incremental material cost is proportionally much greater than the incremental isolation effectiveness thereby achieved.
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