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《Automotive Engineering》 2015-10
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An Analysis on the Influence of Structural Parameters on the Sound Attenuation of Impedance Compound Muffler

Chen Changzheng;Bai Xiaotian;Yu Shenbo;Zhang Lei;School of Mechanical Engineering,Shenyang University of Technology;Engineering Research Center for Noise and Vibration Control of Liaoning Province;  
In this paper,the acoustic performance of impedance compound muffler with an elliptical cross section is studied by using three-dimensional analytic algorithm derived in an elliptical cylindrical coordinates to analyze the effects of different parameters on the sound attenuation of muffler.The results show that the perforation rate,the aperture and the flow resistivity of sound absorption materials all have relatively significant effects on the acoustic attenuation characteristics of muffler.The magnitudes of sound attenuation at high and low frequencies have rather great difference for mufflers with different parameters.So it is strongly suggested in practical application to adjust the structural parameters of muffler according to the frequency characteristics of exhaust noise in different conditions for obtaining satisfactory results.
【Fund】: 国家自然科学基金(51175350)资助
【CateGory Index】: U464.134.4;TB535.2
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