vibration isolation

10.67  vibration isolation. Reduction achieved in the ability of a system to vibrate in response to a mechanical oscillation through the use of a resilient coupling. Annotation              See...

shielding

10.66  shielding. Phenomenon whereby sound reduction is provided by interposing a wall or partition between a sound source and a...

insertion loss

10.65  insertion loss. Of a silencer or other sound-reducing element in a specified frequency band, the decrease in sound pressure level measured at the location of the receiver when a sound insulator is inserted in the transmission path between the sound...

duct lining

10.64  duct lining. Layer of porous material placed on the inner surface of a duct to attenuate sound that propagates through the duct.

critical frequency

10.63  critical frequency. Of a panel or partition, the lowest frequency at which the coincidence effect occurs. Unit, hertz (Hz).    ...

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