基于传递函数的消声器传声损失测量研究

褚志刚;徐少华;卢 喜;杨 亮

振动与冲击 ›› 2009, Vol. 28 ›› Issue (7) : 203-207.

PDF(202 KB)
PDF(202 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (7) : 203-207.
论文

基于传递函数的消声器传声损失测量研究

  • 褚志刚1, 徐少华2, 卢 喜2, 杨 亮3
作者信息 +

STUDY ON MEASUREMENT OF TRANSMISSION LOSS OF MUFFLER BASED ON TRANSFER FUNCITION

  • CHU Zhi-gang1, XU Shao-hua2, LU Xi2 Yang Liang3
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摘要

摘 要:传统的消声器传声损失测量通常是在单末端边界条件下,将消声器上、下游侧作为2个独立声学系统,分别测量上游侧入射功率和下游侧透射功率,进而计算确定其传声损失,该方法未能完全考虑消声器下游侧末端反射波对上游侧的耦合效应,限制了传声损失的测量精度。因此,为了完整计及下游侧末端反射波对上游侧的耦合,提出了基于传递函数的4传声器位置、双末端边界条件传声损失测量方法。并给出了提高传递函数测量精度的传递函数修正算法。在此基础上,以B&K的声学材料测试系统为硬件平台,对典型扩张式消声器进行了传声损失测量分析,实验结果与理论分析结果具有良好的一致性。

Abstract

Abstract: The traditional measurement of the transmission loss of muffler was done in single terminal boundary conditions, the sound fields at the upstream side and downstream side of the muffler were considered to be two independent acoustic systems. Then the transmission loss of muffle was determined by calculating the incidence power of upstream side and the transmitted power of downstream side respectively. But it failed to take into account the full coupling effect on the sound field of upstream side for the reflected wave from the terminal of the downstream side of the muffler, limiting the measurement accuracy of the sound transmission loss. Consequently, in order to take into account the coupling fully, the new measurement method of transmission loss, which based on transfer function, 4 microphone locations, and dual terminal boundary conditions, was put forward. Furthermore, transfer function correction algorithm which can improve the accuracy of transfer function measurements also was derived. In the end, the experiment for transmission loss of a typical expansion muffler using hardware platform of B&K acoustical material testing system was done, and the results were consistent with the theory.

关键词

消声器 / 传声损失 / 传递函数 / 耦合

Key words

muffler / transmission loss / transfer function / coupling

引用本文

导出引用
褚志刚;徐少华;卢 喜;杨 亮 . 基于传递函数的消声器传声损失测量研究[J]. 振动与冲击, 2009, 28(7): 203-207
CHU Zhi-gang;XU Shao-hua;LU Xi Yang Liang. STUDY ON MEASUREMENT OF TRANSMISSION LOSS OF MUFFLER BASED ON TRANSFER FUNCITION[J]. Journal of Vibration and Shock, 2009, 28(7): 203-207

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