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《Journal of Vibration and Shock》 2011-02
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Analysis of whole body noise and muffler improvement for a motorcycle

ZHANG Yuan-yuan1,LI Shun-ming1,HE Yan-song2,MIAO Xiao-dong1(1.College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;2.School of Mechanical Engineering,Chongqing University,Chongqing 400030,China)  
Based on spectral analysis of noise signal and sound-intensity test,noise sources on a motorcycle were identified.The result indicated that the exhaust noises of the engine are the major causes of noise.Using tests and FEM,its exhaust muffler's aerodynamics and acoustic performances were studied,three improvement schemes for its muffler were proposed,and validated using tests.The pass-by noise of the motorcycle with an improved muffler could ultimately be reduced by 1-2 dB.
【Fund】: 国家自然科学基金资助项目(50675099)
【CateGory Index】: U483
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