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。
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 △r/r; the increase of △r 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.
出处
《黑龙江科技学院学报》
CAS
2009年第5期352-355,共4页
Journal of Heilongjiang Institute of Science and Technology
关键词
声强
几何平均
算术平均
误差分析
活塞型声源
sound intensity
geometric average
arithmetic average
error analyses
piston sound source
