Research on sound power testing system(spherical surface method)
The testing of product sound power is related to the intensity of product radiated noise.Currently,a semi anechoic chamber is generally used as the testing environment for product sound power.However,due to the near-field effect of the semi anechoic chamber,measurement results may produce errors.In this article,the spherical surface method is used to envelop the sound source on a spherical surface with the sound source center as the spherical center.The surface sound pressure level measurement points are arranged according to the requirements of GB/T 6882,By setting up three circu-lar brackets,it is possible to achieve 20 surface sound pressure level measurement points.Using a stand-ard sound source as the verification object,the rationality of this method was verified by comparing the 1/3 octave sound power level measured with the standard sound source provided by the superior certifi-cate,and the difference was within±1 dB.
sound power testinganechoic chamberprecision methodspherical surface
NETL
NSTL
万方数据
