复杂穿孔板结构消声器传递损失研究-噪声与振动控制.PDF

第35 卷 第5 期 噪 声 与 振 动 控 制 Vol 35 No.5 2015 年10月 NOISE AND VIBRATION CONTROL Oct. 2015 文章编号：1006-1355(2015)05-0185-04+207 复杂穿孔板结构消声器传递损失研究 陈 敏，郭 辉，徐 驰，王岩松，刘宁宁 (上海工程技术大学，上海 201620 ) 摘 要：为分析穿孔板结构参数对穿孔板消声器传递损失的影响，以某车用消声器为研究对象，利用有限元方法建 立该复杂穿孔板消声器声学模型，并基于两负载法搭建实验台，验证模型的正确性。在此基础上，分析孔隙率、孔径、 板厚等穿孔板结构参数对消声器传递损失的影响。结果表明，随着孔隙率的增大，低频传递损失峰值向高频方向移 动，中高频频带变宽；随着孔径的增大，传递损失变化不大，高频频带变宽；随着板厚的增加，高频传递损失变大。研究 结果对复杂穿孔板结构消声器设计及结构优化具有一定的指导意义。 关键词：声学；消声器；传递损失；两负载法；穿孔板 + 中图分类号：TU 112.59 7 文献标识码：A DOI 编码：10.3969/j.issn. 1006-1335.2015.05.039 Study on Transmission Loss of Complex Mufflers with Perforated Baffles CHEN Min , GUO Hui , XU Chi , WANG Yan-song , LIU Ning-ning ( College of Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China ) Abstract : The acoustic model of a baffle muffler was established by means of finite element method, and the transmission loss of the muffler was analyzed. To measure the transmission loss, a test bench was built with the double-load method adopted. The results of experiments coincided well with the simulation results. On this basis, considering the baffle as a perforated baffle, the influence of some structure parameters, such as the porosity, the pore diameter and the thickness of the baffle, on the transmission loss of the muffler was calculated. The computation results reveal that when the porosity of the perforated baffle increases, the peak of the low- frequency