The Nomogram below can be used to estimate either of the three variables if the other two are known.
For example, if 90% isolation is required from a motor running at 2400 rpm, then a static deflection of approximately 1.6mm would be required. It can be seen that for low forcing frequencies it is necessary to have increasingly large deflections in the mounts tending towards spring based or cable mounts.
It should be remembered that this is a simplified tool and can only provide approximate results as other factors are involved in the final mount selection. Isolation below 50% tends to deteriorate rapidly with small changes to deflection or forcing frequency.
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