Measurement of moving sound source by method of sound intensity for automatic supervision

摘要

In our previous paper, for road noise to the satisfy environmental standard, it was proposed that it is necessary to control each automobile noise of individual vehicles below L{sub}(Amax)=74dB. When a measurement point leaves from the sound source sufficiently, the IL equals to the SPL, and one also corresponds to L{sub}(Amax). The problem, which is the Doppler effect and the propagation delay time, exists in measurement of moving sound source. In this paper, the sound intensity of a moving sound source with constant velocity along a straight line was measured by two microphone method. From the results, it can be said that the measurement errors of sound intensity and it effectiveness were verified.