A boundary element approach is presented to predict acoustic attenuation performance of three-pass perforated duct mufflers. The muffler is divided into a number of substructures and then the BEM is applied to each one of these substructures leading to a system of equations in terms of sound pressure and particle velocity. Using the boundary and continuity conditions, the transfer impedance matrix is obtained between the inlet and outlet of the muffler, yielding the four-pole parameters and the transmission loss. For a prototype configuration, the predictions of transmission loss from the present boundary element approach and the one-dimensional theory are compared with the experimental results. The boundary element predictions match closely the experimental results throughout the frequency range of interest, while the one-dimensional solution shows a reasonable agreement at lower frequencies and deviate at higher frequencies. The effect of perforation length, porosity, lengths of the expansion chamber and the end cavities, as well as duct extensions into the end cavities on the acoustic attenuation performance of three-pass perforated duct mufflers is investigated in detail.
Boundary element analysis of three-pass perforated duct mufflers
Noise Control Engineering Journal ; 48 , 5 ; 151-156
2000
6 Seiten, 12 Quellen
Article (Journal)
English
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