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Rubber has been used in vibration isolation for a considerable time

All engines and many other mechanical and electrical devices require mounting and restraining. These mounting systems often have the added function of isolating the machine vibrations from the mountings.

If we now consider a typical system where we have a vibrating body attached to a bed via a rubber mounting system we have 3 units to consider:

1. The vibrating body, the freer this is to move the more the vibration energy will be dissipated away from the source of the vibration. This will reduce one cause of damage and prolong the life of the equipment. To allow for this vibration we need the mounts to be as soft as possible.

2. The bed and fixings are isolated from the vibrations by an elastic mounting system which prevents transmission of the vibrations to the bed. This reduces the fatigue of the fixings and stops any distress caused by the transmitted vibration. Again the softer the mount the lower the amount of vibration energy transmitted.

3. The rubber mounting system should be capable of carrying the weight of the equipment mounted on it, along with any other loads applied as a result of the equipment’s operation. It must also isolate the vibrations from the bed. The mounting system should also have a long life. For a long life we need strains to be as low as possible, and therefore the stiffness as high as practical.

When considering the above requirements there is a requirement for the mount to be soft and hard at the same time. This requirement to compromise poses a significant challenge to the mount designer to reduce the strain on the rubber at the applied loads, and on the manufacturer to make the mount to the highest standards to extend the life. These considerations require a significant understanding of both vibration engineering and rubber.

Vibration isolation theory is well documented, however, real solutions are complicated by the difficulty in defining and measuring the relevant properties of the rubber. Also as can be seen from the schematic wind generator drive chain the complex interactions require skilled analysis.

NATURAL FREQUENCY fn: Natural Frequency is the frequency of vibration that will occur if a system is disturbed from its normal position and allowed to vibrate freely

DISTURBING FREQUENCY fd: The external force or displacement due to unbalance mass & non-uniform torque Calculation for Finding Isolators Natural Frequency:-