114 ACCURACY EVALUATION OF THE SOUND POWER MEASUREMENT BY THE SOUND PRESSURE AND THE SOUND INTENSITY METHODS(O.S.4 Measurement and Sensor II)

概要

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Because of its plane-wave assumption at measurement points, the pressure method is in essence an approximation in determining the sound power of a source. In the sound intensity method, however, the cause of the measurement error is theoretically due only to the finite number of the measurement points. In the present paper, degrees of measurement errors of the two methods are evaluated using a sound source model that comprises multiple point-like spherical sources placed above an infinitely large rigid floor. Using this model, it is possible to evaluate measurement accuracies of the sound pressure and the sound intensity methods. Roughly speaking, in order to keep the error within ±1.0dB, the number of measurement points must be equal to or larger than 20, and the radius of the measurement surface must be equal to or larger than twice the largest dimension of the source.
一般社団法人日本機械学会の論文
2005-05-31