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Up to now, the low frequency pressure response of the vented enclosure has been studied with the analog circuit. But some of the peaks and the valleys at the pressure response curve can not be explained. In this paper a new theory which combines the sound field with the analog circuit is presented for the purpose of solving this problem. 相似文献
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In this paper.the sound radiation characteristics of secondary sources are analyed theoretically and experimentally.Akind of tripole elements of secondary source is realied.A method using acceleration signal as the input to the controlsystem has been introduced.Experiments are conducted both in an anechoic chamber and a reverberation room.The resultsof global attenuations of the-dimensional noise fields in tbe low frequency range are given and discussed. 相似文献
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本文描述了用球面駐波法測吸声材料(或水下底貭)的反射係数,实驗結果証明:本方法测試仪器及装置簡单並具有較高的精确性。並对剛性面及胶合玻璃纤维棉作了測量,后者还同駐波管法結果作了比較,两者吻合得比較好。 相似文献
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理论研究了多参考通道自适应有源结构声辐射控制系统参考信息的拾取问题,利用二维空间采样定理,对简支条件下矩形板的受激振动信号的采样点的个九和布放作了研究,出了恢复矩形板的振动信号的解析形式,并作了数值计算的误差分析,得到的结果具有普通性,对结构振动的近场声辐射的预测及进行有源噪声低消的研究和应用具有重要的意义。 相似文献
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空间有源消声的声能量流研究 总被引:1,自引:0,他引:1
本文从理论和实验两个方面对平面噪声场中单极子次级源、偶极子次级源最小辐射声功率时的空间产能量流作了研究,从而直观、清晰地描述了一种消声机理:有源声吸收。并指出:尽管此时次级声源是\ 相似文献
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