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| 基于传递函数的消声器传声损失测量技术研究 | |
| 引用本文： | 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技术研究[J]. 振动与冲击, 2009, 28(7) |
| 作者姓名： | 褚志刚 徐少华 卢喜 杨亮 |
| 作者单位： | 1. 重庆大学,机械工程学院,重庆,400030 2. Brüel&Kjaer声学和振动测量仪器公司,中国代表处,上海,200233 3. 重庆长安,汽车工程研究院,重庆,401120 |
| 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,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具有良好一致性. |
| 关 键 词： | 消声器 传声损失 传递函数 耦合 |
Measurement of transmission loss of a muffler based on transfer function |
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| CHU Zhi-gang,XU Shao-hua,LU Xi,YANG Liang. Measurement of transmission loss of a muffler based on transfer function[J]. Journal of Vibration and Shock, 2009, 28(7) | |
| Authors: | CHU Zhi-gang XU Shao-hua LU Xi YANG Liang |
| Abstract: | The traditional measurement of the transmission loss of a 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 independ- ent acoustic systems. Then, the transmission loss of the muffler was determined by calculating the incidence power of the upstream side and the transmitted power of the downstream side, respectively. But it failed to take the full coupling effect of the reflected wave from the terminal of the downstream side of the muffler on the sound field of the upstream side into account, and limited the measurement accuracy of the sound transmission loss. Consequently, in order to take the cou- pling into account fully, the new measurement method of transmission loss, which was based on transfer function, 4 micro- phone locations, and dual terminal boundary conditions, was put forward. Furthermore, a transfer function correction al- gorithm which could 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 experimental results were consistent with the theoretic ones. |
| Keywords: | muffler transmission loss transfer function coupling |
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