| This paper based on the noise reduction engineering case of the centrifugal compressor in the factory. Through the noise measuring and spectral analysis of centrifugal compressor and its pipe, the noise source was found out to be the aerodynamic noise of compressor. The aerodynamic noise propagates through the pipe and radiate outside, which forms the reverberation in the pipeline workshop to make the sound pressure level higher than the centrifugal compressor workshop. Through the analysis before, the two methods dissipative muffler and pipeline wrapping could be used to reduce the noise level. But the majority of traditional design methods are based on the experience and testing to define the parameter of dissipative muffler and pipeline wrapping which is often aimless, expensive and need long design period. This paper compare the analytical calculate method, finite element method and experimental data of muffler transmission loss and find out the finite element method could calculate the muffler transmission loss accurately and conveniently. Then the finite element method and CFD method is used to analysis the effect of variation of muffler parameter to the transmission loss and pressure loss include the numbers of layer, distribute mode, thickness flow rate of absorb material and the dimension of muffler to find out how to determinate the muffler parameter. Moreover, the effect of variation of wrapping metal plate thickness, absorb material thickness and flow rate to the insertion loss of the pipeline wrapping to provide the basis of parameter determination. |
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