噪声与振动控制Issue(4)：71-74,4.DOI:10.3969/j.issn.1006-1335.2015.04.016
排气消声器对加速行驶车外噪声的影响分析
Analysis of the Influence of Exhaust Muffler on Pass-by Noise of Accelerating Trucks
摘要
Abstract
Exhaust muffler has a very important contribution to the pass-by noise reduction of heavy duty trucks. In order to investigate the influence of the exhaust muffler on the pass-by noise of heavy-duty trucks, the insertion losses of the exhaust systems of a heavy-duty truck and a benchmark heavy duty truck were tested experimentally under several operation conditions. The results show that the pass-by noise of the truck could be less than the limit of 80 dB(A) if the insertion loss of the muffler was larger than 20 dB(A). Unfortunately, the domestic heavy duty truck cannot satisfy this requirement. Then, the acoustic performance of the domestic heavy duty truck’s exhaust muffler was improved. The insertion losses of the muffler before and after the improvement were analyzed by means of the finite element method. Finally, the improved muffler was made, installed in the truck and tested. The test results show that the pass-by noise of the domestic truck with the improved muffler can be reduced by 3.3 dB(A).关键词
声学/排气消声器/传递损失/车外加速噪声/有限元分析Key words
acoustics/exhaust muffler/transfer loss/pass-by noise/finite element analysis分类
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运伟国,武智方,邓超..排气消声器对加速行驶车外噪声的影响分析[J].噪声与振动控制,2015,(4):71-74,4.基金项目
陕西省自然科学基金(2011JM7016) （2011JM7016）
