【摘要】 采用p-p法计算声强时,算术平均算法计算常规声压平均存在高频区误差较大、测量效率低等不足。针对这一情况,提出应用几何平均计算声压的方法,并以活塞声源为例,对两种声压计算方法得到的声强误差进行对比分析。结果表明:几何平均声强误差曲线随Δr/r的变化更明显;随Δr增大,两种计算方法测量频率上限均下降;与算术平均算法相比,几何平均算法更适合于宽频测量,且该算法计算机运算时间短,测量效率和测量实时性高。该研究提供了一种更为理想的声强计算方法。更多还原

【Abstract】 This paper is an attempt to seek a better alternative to the arithmetic mean algorithm which reveals more errors in high-frequency sound pressure and less measurement efficiency when used to calculate the average of conventional sound pressure,as required by the calculation of the intensity of sound by p-p method.The paper proposes the application of the geometric mean method of calculate sound pressure and based on piston sound source and gives a contrast analysis of the errors of sound intensity produced by the two sound pressure-calculating methods.The results show that the geometric mean error curve is more obvious to the sound intensity,depending on changing Δr/r; the increase of Δr leads to decreases in the frequency-measuring upper limits of the calculation methods.The geometric mean method which lends itself better to broadband measurement than arithmetic mean algorithm exhibits less computer computation time,greater measuring efficiency,and better real-time measurement.The present study provides a more desirable sound intensity-calculating method.更多还原