vibration levels with spring isolators
vibration levels with spring isolators
(OP)
I know that there are several standards for acceptance levels of vibration for equipment rigidly supported. However,if a piece of equipment is supported by spring isolators, are there any acceptance levels on record. I would think that the equipment itself would have higher amplitudes of vibration is it is supported by springs.
Any help out there?
Thanks
Any help out there?
Thanks





RE: vibration levels with spring isolators
Different rules apply for rigidly compared to resiliently mounted equipment.
RE: vibration levels with spring isolators
RE: vibration levels with spring isolators
You must also ensure that the vibration level transmitted to the foundation/structure does not exceed 4.5mm/s RMS (velocity).
Other factors to consider is the deflection limit (amplitude) of the springs, ie. 1 inch or 2 inch deflection etc. Be careful when you design the location of the spring isolators. Try as much as possible to locate the isolators evenly, based on equal mass distribution of the equipment ie. each mount should have equal load sitting on it.
Try to check with the vibration isolation specialist eg. korfund isolators of the US.
Hope this may help.
RE: vibration levels with spring isolators
For integral horsepower motors, NEMA MG-1 allows 0.12 ips (pk/0) when tested rigidly mounted and 0.15 ips when tested resiliently mounted. That 0.03 ips is a difference of 20 to 25% depending on which number you compare it to.
This applies for factory testing of a motor. It's not intended to apply for installed equipment although most users are happy if their equipment comes close to the factory limit.
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RE: vibration levels with spring isolators