Application & principles of anti-vibration mountings

Anti-vibration mountings installed in machines and equipment’s help minimize the level of vibration transmitted from a system to its surrounding area. Alternatively these vibration mounts are used to protect the fragile equipment from the external vibrations. The amplitude of vibration of the system itself does not decrease and must therefore needs to move with the vibration.

 Generally anti- vibration mountings should be selected to provide at least 70% isolation, with not more than 30% transmission, against the lowest disturbing frequency of the

Application & principles of anti-vibration mountings

Application & principles of anti-vibration mountings

system. Whereas, in case of static applications the maximum recommended strain in the rubber is 15% in compression and 30% in shear.  Also, certain rubber-to-metal bonded mountings are used in shock applications to absorb energy, and compression strain levels of up to 30% which are acceptable in this type of application.

So, while there is an external force of energy maintaining the vibration of the system, anti-vibration mounts incorporating rubber reduce the amplitude of vibration that is passed in to the surrounding structure. In such a case the system is said to have a degree of isolation. If the amplitude of vibration of the given system progressively reduces, the system is then said to be damped. That is there is no external source of energy maintaining the amplitude of vibration and thus the system ceases to vibrate.

 

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