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声强法测定噪声源声功率的误差分析

发表时间:2016-01-15  浏览量:1855  下载量:641
全部作者: 纪明祥,陆益民
作者单位: 合肥工业大学噪声振动研究所
摘 要: 以点声源和相干声源为例,采用数值仿真分析方法,针对双传声器互谱声强的有限分误差,通过对比声强理论值和互谱测量值,分析离散点声强法测定噪声源声功率的误差,并在半消声室中对点声源进行实验验证。结果表明,测点数目足够时,数值仿真方法可以准确算出声源声功率级。要获得同样的测量精度,相干声源场需要比点声源场更多的测点。在六面体包络面中,以1 dB误差作参考,声功率的测试精度高于声强的测试精度。
关 键 词: 声学;互谱声强;数值仿真;声功率;误差
Title: Error analysis of sound power of noise sources by cross-spectral sound intensity method
Author: JI Mingxiang, LU Yimin
Organization: Institute of Sound &Vibration Research, Hefei University of Technology
Abstract: In this paper, taking the case of point source and coherent source, using the method of numerical simulation, aimed at finite difference of two microphone cross-spectral sound intensity, we analyzed the error of sound power of noise sources in the method of discrete point sound intensity by comparing the sound intensity theoretical value to the measured value and carried on verification testing of point source in a semi anechoic-chamber. The results show that when there are enough numbers of measuring points, sound power of sound source can be calculated by numerical simulation precisely. In order to obtain the same measurement accuracy, the coherent sound source field needs more measurement points than the point sound source field. In the envelope surface of hexahedron, take 1 dB error for reference, the accuracy of sound power is greater than that of sound intensity.
Key words: acoustics; cross-spectral sound intensity; numerical simulation; sound power; error
发表期数: 2016年1月第1期
引用格式: 纪明祥,陆益民. 声强法测定噪声源声功率的误差分析[J]. 中国科技论文在线精品论文,2016,9(1):49-54.
 
3 评论数 2

:文章新颖,立意不错,逻辑性强,值得相关学科研究人员学习

2016-03-28 15:24:42

:回复jingran1988:good

2016-03-28 15:26:33
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