Acoustic Performance Optimization of the Exhaust Muffler for a Car Based on Response Surface Method

Abstract

Abstract: The noises in the interior and exterior of a vehicle are measured in a stationary test, and the results reveal that noise reduction capability of its exhaust muffler is quite weak in the midfrequency. In order to improve the midfrequency transmission loss (TL) of the muffler, optimization is conducted based on the response surface method (RSM). Firstly, the length of insert tubes, position of perforated plates, perforation rate, etc. are selected as design variables and are sampled by the Latin hypercube method, and the frequencyaveraged TL of each sampled point is calculated by acoustic finite element method. Secondly, an RSM model of the midfrequency TL is developed by the Kriging surrogate technique, and its accuracy is validated by reanalysis. Finally, based on this model, the midfrequency TL is optimized by genetic algorithm. After optimization the midfrequency TL is 41.38dB increasing 14.33dB than the original value 27.05dB, and also the overall noise reduction performance of this muffler is improved significantly. The RSMbased optimization procedure in this paper provides a guideline for the acoustic performance design of the mufflers.

Key words: muffler, acoustic performance optimization, transmission loss (TL), response surface method (RSM) model

CLC Number:

LI Mingrui1,DENG Guoyong2,MI Yongzhen1,ZHENG Hui1. Acoustic Performance Optimization of the Exhaust Muffler for a Car Based on Response Surface Method[J]. Journal of Shanghai Jiaotong University, 2017, 51(9): 1031-1035.

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