Acoustic attenuation analysis of expansion chambers with extended inlet/outlet
Numerical mode matching (NMM) method is developed to predict and analyze the acoustic attenuation performance of expansion chambers with extended inlet/outlet. The two-dimensional finite element method is employed to extract the transversal eigenvalues and eigenvectors, and the mode
matching technique is used to determine the modal amplitudes and transmission loss of expansion chamber silencers by combining the boundary conditions at inlet and outlet. The transmission loss results from the NMM method, three-dimensional finite element method (FEM), and experiment showed
good agreements for circular expansion chambers with extended inlet and outlet ducts, which verified the accuracy of the present NMM method in calculating the acoustic attenuation performance of expansion chamber. Then theNMM method is used to investigate the effects of arrangements, extended
lengths and locations of inlet and outlet ducts on the acoustic attenuation performance of elliptical expansion chambers.
Document Type: Research Article
Affiliations: Harbin Engineering University
Publication date: 01 March 2013
NCEJ is a peer reviewed Technical journal published every two months. The papers published in NCEJ cover general topics related to noise control engineering, ranging from fundamental research to applied case studies and histories.
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