Simulation Analysis of Acoustic Attenuation Performance for Different Shape of an Expansion Chamber Silencer
Information and Computing Science, 2009. ICIC '09. Second International Conference（2009）
摘要
This paper studied the internal laws of silencers’ acoustic attenuation performance, when the cross-sectional shape, length and diameter of the expansion chamber changed. Based on the BEM-FEM coupled model and to combine with the improved Four-pole Parameters Method, the transmission loss (TL) was calculated. It is pointed that the flatter the expansion chamber is, the worse the performance is. When the length decreases, the domes of the TL become broader, and the number of domes decreases. When the diameter increases, the TL increases, but the growth rate and the inactive frequency decrease. The results indicate that by using computer modeling analysis, it is sensible to optimize the shape to meet the needs of the eliminating frequency band and the applied circumstance.
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关键词
frequency band,diameter increase,simulation analysis,acoustic attenuation performance,inactive frequency decrease,domes decrease,length decrease,applied circumstance,cross-sectional shape,different shape,tl increase,expansion chamber,expansion chamber silencer,numerical simulation,fem,shape,acoustics,couplings,cross section,computer model,noise abatement,finite element methods,frequency,attenuation,acoustic attenuation,international law,computational modeling,acoustic waves,silencer,finite element analysis
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