Methods of measurement of acoustic noise radiated by an electric machine
- 1 January 1969
- journal article
- Published by Institution of Engineering and Technology (IET) in Proceedings of the Institution of Electrical Engineers
- Vol. 116 (8) , 1419-1431
- https://doi.org/10.1049/piee.1969.0256
Abstract
The acoustic field of an electric machine is described, and the basic measuring techniques and instrumentation for measuring noise are described. The results of sound-pressure measurements in free-field and semireverberant-field conditions, and measurements of sound pressure above a reflecting plane with various shapes of measuring surface are presented and discussed. From these measurements, the total sound power is calculated. The errors involved in using different numbers of sound-pressure sampling points in the power calculation, and of using approximate calculating procedures, are also investigated. Evidence is presented concerning the accuracy of methods of measurement and calculation.Keywords
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