On the acoustic analysis and optimization of ducted ventilation systems using a sub-structuring approach

The Journal of the Acoustical Society of America
X YuLi Cheng

Abstract

This paper presents a general sub-structuring approach to predict the acoustic performance of ducted ventilation systems. The modeling principle is to determine the subsystem characteristics by calculating the transfer functions at their coupling interfaces, and the assembly is enabled by using a patch-based interface matching technique. For a particular example of a bended ventilation duct connecting an inlet and an outlet acoustic domain, a numerical model is developed to predict its sound attenuation performance. The prediction accuracy is thoroughly validated against finite element models. Through numerical examples, the rigid-walled duct is shown to provide relatively weak transmission loss (TL) across the frequency range of interest, and exhibit only the reactive behavior for sound reflection. By integrating sound absorbing treatment such as micro-perforated absorbers into the system, the TL can be significantly improved, and the system is seen to exhibit hybrid mechanisms for sound attenuation. The dissipative effect dominates at frequencies where the absorber is designed to be effective, and the reactive effect provides compensations at the absorption valleys attributed to the resonant behavior of the absorber. This ult...Continue Reading

References

Dec 10, 2008·The Journal of the Acoustical Society of America·Ray Kirby
Jul 27, 2011·The Journal of the Acoustical Society of America·Huahua HuangJian Kang
May 13, 2014·The Journal of the Acoustical Society of America·Xiang YuJean-Louis Guyader
Aug 7, 2014·The Journal of the Acoustical Society of America·Xiang YuJean-Louis Guyader
Feb 24, 2015·The Journal of the Acoustical Society of America·Xiang YuXiangyu You

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