April 2009

Engineering Case Histories

Case 49: Isolating foundations from machinery vibrating forces

Vibration can be detrimental to nearby equipment

Sofronas, A., Consulting Engineer

A roof fan that had been rebuilt and balanced was causing excessive noise and was shaking nearby equipment. The rubber isolators on which the fan was originally mounted had been discarded during disassembly. With no information on the type of mounts the maintenance team installed some they had obtained from an idle piece of equipment. Most equipment is rigidly mounted and so, this type of vibration problem does not occur often. The following analysis was done to see if these isolators were the cause of the higher vibration levels. It's a good case history because it also explains some important vibration principles. Fig. 1 shows the simplified fan along with a support point that wil

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