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《Journal of Vibration and Shock》 2009-07
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Measurement of transmission loss of a muffler based on transfer function

CHU Zhi-gang1,XU Shao-hua2,LU Xi2,YANG Liang3(1.College of Mechanical Engineering,Chongqing University,Chongqing 400030,China;2.China Representative Office of Brüel B&K jr Sound&Vibration Measurement A/S,Shangh ai 200233,C hina; 3.Chongqing Chang'an Automobile Engineering Institute,Chongqing 401120,China)  
The traditional measurement of the transmission loss of a muffler was done in single terminal boundary conditions,the sound fields at the upstream side and downstream side of the muffler were considered to be two indedend-ent acoustic systems.Then,the transmission loss of the muffler was determined by calculating the incidence power of the upstream side and the transmitted power of the downstream side,respectively.But it failed to take the full coupling effect of the reflected wave from the terminal of the downstream side of the muffler on the sound field of the upstream side into account,and limited the measurement accuracy of the sound transmission loss.Consequently,in order to take the cou-pling into account fully,the new measurement method of transmission loss,which was based on transfer function,4 micro-phone locations,and dual terminal boundary conditions,was put forward.Furthermore,a transfer function correction al-gorithm which could improve the accuracy of transfer function measurements also was derived.In the end,the experiment for transmission loss of a typical expansion muffler using hardware platform of BK acoustical material testing system was done,and the experimental results were consistent with the theoretic ones.
【CateGory Index】: TB535.2
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