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10.2013

Vibration Mount Selection Guide:

How we should decide to use which type/model of elastic mounts for our rotating machinery:

 

This recommendations are not proper to use for main propulsion engines, only for secondary machineries like pumps, chiller units and generator sets etc.

     1. Determine the total weight of the equipment & number of required mounts

     2. Calculate the weight on each mounting

     3. Determine the running speed (or forcing frequency) of the equipment

     4. Determine the static deflection of the mounting ( f = (300/d)^1/2 )

          - f= required natural frequency of the vibration mount

          - d = static deflection

     5. Based on the load per mounting, select a suitable mounting type to give the required static deflection, taking into account the specific application requirements, such as whether the equipment is Mobile or Static

     6. Ensure that all connections & services to the equipment, such as exhausts, pipework and ducting are flexible i n order to allow the equipment to move freely

 

Below shown image indicates for resonance curve.  A plot of the transmissibility T is shown in below image for various values of the damping coefficient ζ.  In the limit where ζ approaches zero, there is infinite amplification at the resonance frequency ω0. As the damping increases, the amplitude at resonance decreases.  However, the “roll-off” at higher frequencies decreases (i.e. the transmissibility declines more slowly as damping increases).

 

Please feel free to contact if you may have any question.

Tags:elastic mounts vibration mounts resonance curve natural frequency resonance genova marine engineering