Although much of noise control is based upon the sound paths of the type shown in figure-1 (below). These are not only paths. Airborne sound results from any vibrating surface. However, the housing of a machine is not necessarily the only vibrating surface. The vibrations of a machine can cause the radiation of noise at places quite remote from the machine itself by causing the structure on which the machine is mounted, to vibrate. The vibration in turn can be transmitted to adjacsent structures which can radiate air-borne sound.
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