The Principles of Anti Vibration Mountings

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The Principle of Anti Vibration Mountings

Anti vibration mountings minimise the level of vibration transmitted from an oscillatory system to its surroundings. Alternatively the mounts can be used to protect fragile equipment from external vibrations. The amplitude of vibration of the oscillatory system itself does not decrease and must therefore be able to move with the vibration.

Generally mountings should be selected to provide at least 70% isolation, i.e. no more than 30% transmission, against the lowest disturbing frequency of the system. For static applications the maximum recommended strain in the rubber is 15% in compression and 30% in shear. Certain rubber-to-metal bonded mountings can also be used in shock applications to absorb energy, and compression strain levels of up to 30% are acceptable in this type of application.

Vibration Isolation

When there is an external force of energy maintaining the vibration of an oscillatory system, anti vibration mounts incorporating rubber reduce the amplitude of vibration that is passed in to the surrounding structure and the system is said to have a degree of isolation.

Vibration Damping

If the amplitude of vibration of an oscillatory system becomes progressively smaller, the system is said to be damped i.e. there is no external source of energy maintaining the amplitude of vibration and therefore the system ceases to vibrate.

Design Aspects Regarding The Mounting Of Rubber / Metal Products

Figure 1.4

Wrong: There is metallic contact between the machine and the base.

Right: Machine and base are completely isolated from each other.

Figure 1.5

Placing inserts opposite one another should be avoided if possible.

Preferred: The thickness of the rubber is more effectively used to achieve good cushioning.

Figure 1.6

Wrong: The rubber is totally encapsulated and is thus unable to deform.

Right: The rubber is now able to deform and hence isolates the machine.

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