声强法测声功率的工程应用研究

Engineering application of sound power determination using sound intensity measurement

本文从工程实用角度出发 ,以实验分析为基础来探讨声强法测量声功率的误差问题。主要将背景噪声与测量环境结合起来 ,研究背景噪声、声源表面吸收在不同环境中的影响 ,还对声强法与声压法的差别作了比较。经试验研究表明 ,在一般厂房中用声强法测量设备声功率时 ,即使背景噪声比设备声压级高 1 1dB都可照常进行 ,结果勿需修正。

In this paper,the errors of sound power determination using sound intensity measurement are studied,based on the analysis of experimental results with the eyes of engineering application.Through combining background noise and measuring environment study,the effects of background noise,surface absorption of the source in different environments as well as the difference between sound intensity measurement and sound pressure measurement are emphasized.It is shown by experiments that,the measurement of sound intensity may continue normally in general workshops even if the background noise is 11 dB more than the sound pressure level of the equipment,and the results will be fairly accurate without any correction.The conclusions in this paper are the realistic guides in the application of sound intensity measurement.