一种声强计算的新方法

NEW METHOD FOR SOUND POWER CALCULATION

采用p_p法计算声强时 ,需要将两声器测得的声压进行平均作为被测点的声压 ,将两声压进行差分计算来间接获得声振速。常规声压平均一般均基于算术平均算法 ,分析发现 :在高频区误差较大。针对声场大多呈非线性的特点 ,提出了应用几何平均计算声压的方法。并分别以两同相小球源和声柱为例 ,对基于这两种计算声压的方法得到的声强误差进行了对比分析 ,结果表明 :在高频区由几何平均计算声强的精度明显高于由算术平均计算声强的精度。

When calculating the power of sound source using the p_p strategy,the sound pressures obtained via two microphones should be averaged to get the average sound pressure of the estimated point,and from the differential of the two sound pressures the sound vibrating speed can be derived.Normally the average of the sound pressures is based on arithmetical average.Study shows that the error is biggish in high frequency range.In view of that most of the sound fields are nonlinear,so the method of calculating the sound pressure based on geometrical average is developed.The two same balls sound source and cylinder sound source are taken as studied cases respectively,and the sound power errors obtained via the two averaging methods are compared .Results show that in high frequency range,the sound power error obtained via geometrical averaging is less than that calculated via arithematical averaging method.