Abstract
This work extends the application of the finite volume method to predict the acoustic performance of the water muffler with the consideration of elastic walls. The three-dimensional time-domain finite volume method and the improved time-domain impulse method are employed to predict the acoustic attenuation characteristics of mufflers. The present results agree well with analytical solutions and numerical results obtained by finite element method with commercial codes. The effects of different thicknesses of elastic end cavity wall, elastic tube, and cavity walls on acoustic characteristics of a water-filled Helmholtz resonator are investigated. An attempt to simplify the present method with the effective sound speed has been implemented and discussed.
Highlights
Pumps are widely used in different industries and are the main sources of noise in piping systems
The results indicated that the wall compliance reduced the resonance frequency in comparison with an identically shaped rigid cavity
In order to obtain transmission loss (TL) by the modified impulse method, a Gaussian pressure pulse p = exp [2(t 2 3/(1.6 3 104))2/(1/(1.6 3 104))2] Pa is applied at the inlet of the main pipe in the fluid subdomain, where T# = 1/(1.6 3 104) s is obtained according to 2 lin . 6 cmax T# with lin = 0.3 m and cmax = cf
Summary
Pumps are widely used in different industries and are the main sources of noise in piping systems. Keywords Water muffler, structural acoustic interaction, finite volume method, transmission loss, elastic wall Zhou et al.[8] discussed the effect of the elastic walls on the acoustic characteristics of a water Helmholtz resonator. It is hard to use the method in Zhou et al.’s study[8] to consider the effects of the elastic sidebranch tube and main pipe on the acoustic performance.
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