作者：陆益民, 纪明祥, 陈品, 李志远
作者单位：合肥工业大学噪声振动研究所, 安徽 合肥 230009
关键词：声强测量系统;修正声强;有限差分;误差分析
摘要：
传统的声强测量系统价格昂贵,有限差分的存在使得测试频域受到探头间距的限制,宽频噪声需分段多次测量。根据互谱声强算法,利用采集卡、传声器和虚拟仪器技术开发出一套便捷、高效、低成本的声强测量系统,包括数据采集、系统声压灵敏度标定、相位失配标定和声强测量。针对算法中存在的有限差分误差进行修正,在半消声室中以宽带白噪声为声源,用开发的声强测量系统分析探头间距为20 mm和50 mm时探头轴线和声源传播方向夹角分别为0、45的修正前后声强误差。结果表明该声强测量系统有效,修正后同一探头间距测试频域得到拓展,声强准确度得到提升。
Design and experimental verification of corrected sound intensity measurement system
LU Yimin, JI Mingxiang, CHEN Pin, LI Zhiyuan
Institute of Sound & Vibration Research, Hefei University of Technology, Hefei 230009, China
Abstract: As the traditional sound intensity measurement system is expensive and the finite difference makes the test frequency domain be limited by probe interval and broadband noise be measured by sections in several tests, a set of convenient, efficient and low-cost sound intensity measurement system covering data acquisition, system sound pressure sensitivity calibration, phase mismatch calibration and sound intensity measurement was developed by using capture card, microphone and virtual instrument technology according to cross spectrum sound intensity algorithm. It corrects the error of finite difference in the algorithm and analyzes the error of sound intensity after and before correction when the included angle in probe axis direction and sound source transmission direction is 0° and 45° respectively(when the probe interval is 20 mm and 50 mm) with the developed sound intensity measurement system by taking the wideband white noise in semi-anechoic room as the sound source. Results show that the sound intensity measurement system is effective and after the correction, the test frequency domain at one same probe internal is expanded and the sound intensity accuracy is improved.
Keywords: sound intensity measurement system;corrected sound intensity;finite difference;error analysis
2016, 42(6): 70-73,99 收稿日期: 2015-12-08;收到修改稿日期: 2016-01-13
基金项目:
作者简介: 陆益民(1972-),男,安徽合肥市人,副教授,博士,研究方向为噪声与振动控制。
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