Audio frequency vibration transmitted from operating machinery into supporting and connected structures is often responsible for the noise and vibration problems in complex built-up system such as compressor mount system in the air-conditiner.
The fundamental quantity for characterizing the vibratory coupling between structures is neither forces nor velocities, but power.
In general, vibration isolation system consists of a vibrating machine connected to a structure at multiple points by vibration isolators. The vibrational power which is fed into the structure is governed by a number of factors including : the vibrational ‘soure-strength‘ of the machinery, the influence of vibration controlling measures such as vibration isolation, and the dynamic properties of both the machinery and the foundation structure on which the machinery is mounted.
In this thesis, a new performance of isolation system which has multi-point mount and nonrigid base structure is presented. Performance is expressed in terms of vibrational power effectiveness which relates the vibrational power transmission in an isolated system to the vibrational power trasmission in an unisolated system. Vibraional power effectiveness is derived for a mounting system connected to nonrigid base structure at multiple points by massless isolators. Usefulness of vibrational power effectiveness is illustrated by its application to compressor mount system of the air-conditioner.
