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A generalized scheme for analysis of multifarious commercially used mufflers

Panigrahi, SN and Munjal, ML (2007) A generalized scheme for analysis of multifarious commercially used mufflers. In: Applied Acoustics, 68 (6). pp. 660-681.

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Commercial automotive mufflers are often too complex to be broken into a cascade of onedimensional elements with predetermined transfer matrices. The one-dimensional (1-D) scheme presented in this paper is based on an algorithm that uses user-friendly visual volume elements along with the theory of transfer matrix based muffler analysis. This work attempts to exploit the speed of the one-dimensional analysis with the flexibility, generality and user- friendliness of three-dimensional analysis using geometric modeling. A code based on the developed algorithm has been employed to demonstrate the generality of the proposed method in analyzing commercial mufflers by considering three very diverse classes of mufflers with difflerent kinds of combinations of reactive, perforated and absorptive elements. Though the examples used in the paper are not very complex for they are meant to be just representative cases of certain classes of mufflers, yet the algorithm can handle a large domain of commercial mufflers of high degree of complexity. Results from the present algorithm have been validated through comparisons with both the analytical (plane wave based) and the more general, three-dimensional FEM based results. The forte of the proposed method is its power to construct the system matrix consistent with the boundary conditions from the geometrical model to evaluate the four-pole parameters of the entire muffler and thence its transmission loss, etc. Thus, the algorithm can be used in conjunction with the transfer matrix based muffler programs to analyze the entire exhaust system of an automobile.

Item Type: Journal Article
Publication: Applied Acoustics
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Automotive muffler;Silencer;Transfer matrix;Algorithm
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 01 Dec 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ac.in/id/eprint/11588

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