修正声强测量系统设计及实验验证

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1、第42卷第6期中国测试Vol.42No.62016年6月CHINAMEASUREMENT&TESTJune，2016doi院10.11857/j.issn.1674-5124.2016.06.016修正声强测量系统设计及实验验证陆益民袁纪明祥袁陈品袁李志远（合肥工业大学噪声振动研究所，安徽合肥230009）摘要院传统的声强测量系统价格昂贵袁有限差分的存在使得测试频域受到探头间距的限制袁宽频噪声需分段多次测量遥根据互谱声强算法袁利用采集卡尧传声器和虚拟仪器技术开发出一套便捷尧高效尧低成本的声强测量系统袁包括数据采集尧系统声压灵敏度标定尧相位失配标定和声强测量遥针对算法中存在的有限差分误差进行

2、修正袁在半消声室中以宽带白噪声为声源袁用开发的声强测量系统分析探头间距为20mm和50mm时探头轴线和声源传播方向夹角分别为0毅尧45毅的修正前后声强误差遥结果表明该声强测量系统有效袁修正后同一探头间距测试频域得到拓展袁声强准确度得到提升遥关键词院声强测量系统；修正声强；有限差分；误差分析文献标志码院A文章编号院1674-5124渊2016冤06-0070-04DesignandexperimentalverificationofcorrectedsoundintensitymeasurementsystemLUYimin，JIMingxiang，CHENPin，LIZhiyuan（Ins

3、tituteofSound&VibrationResearch，HefeiUniversityofTechnology，Hefei230009，China）Abstract:Asthetraditionalsoundintensitymeasurementsystemisexpensiveandthefinitedifferencemakesthetestfrequencydomainbelimitedbyprobeintervalandbroadbandnoisebemeasuredbysectionsinseveraltests，asetofconvenient，efficientan

4、dlow-costsoundintensitymeasurementsystemcoveringdataacquisition，systemsoundpressuresensitivitycalibration，phasemismatchcalibrationandsoundintensitymeasurementwasdevelopedbyusingcapturecard，microphoneandvirtualinstrumenttechnologyaccordingtocrossspectrumsoundintensityalgorithm.Itcorrectstheerroroff

5、initedifferenceinthealgorithmandanalyzestheerrorofsoundintensityafterandbeforecorrectionwhentheincludedangleinprobeaxisdirectionandsoundsourcetransmissiondirectionis0毅and45毅respectively（whentheprobeintervalis20mmand50mm）withthedevelopedsoundintensitymeasurementsystembytakingthewidebandwhitenoisein

6、semi-anechoicroomasthesoundsource.Resultsshowthatthesoundintensitymeasurementsystemiseffectiveandafterthecorrection，thetestfrequencydomainatonesameprobeinternalisexpandedandthesoundintensityaccuracyisimproved.Keywords:soundintensitymeasurementsystem；correctedsoundintensity；finitedifference；erroran

7、alysis0引言体现袁声强测量不需要特定的消声室或半消声室袁随声强具有方向性的优势在现代声学测量中得到着声强技术和测试软硬件的发展袁声强测量已广泛应[1][2][3]收稿日期院2015-12-08曰收到修改稿日期院2016-01-13用于声功率测试尧噪声源识别尧声场特性分析等作者简介：陆益民渊1972-冤袁男袁安徽合肥市人袁副教授袁博士袁方面袁国内也用声强技术解决了大型电器设备的声学[4-5]研究方向为噪声与振动控制遥