The Measurement of Transfer Functions for Noise Control Applications

In principle.the prediction of airborne noise resulting from machine vibration requires knowledge of the source of the vibrations. of the structural transmission path between source and receiver and of the ef ciency of the conversion of vibration to airborne noise.In practice.the transmission path and the conversion ef ciency may be combined into one overall transfer function Practical values of these paramelers have been measured experimentally.Two real cases have also been investigated in the eld.All of the measurements were carried out using an FFI analyser giving 400point spectra over the range 0-500Hz. BASIS OF THE METHOD.