Noise reduction with perforated three-duct muffler components

Narayana Rao, K and Munjal, ML (1986) Noise reduction with perforated three-duct muffler components. In: Sadhana : Academy Proceedings in Engineering Sciences, 9 (4). pp. 255-269.

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Abstract

This paper describes the authors’ distributed parameter approach for derivation of closed-form expressions for the four-pole parameters of the perforated three-duct muffler components. In this method, three simultaneous second-order partial differential equations are first reduced to a set of six first-order ordinary differential equations. These equations are then uncoupled by means of a modal matrix. The resulting 6 × 6 matrix is reduced to the 2 × 2 transfer matrix using the relevant boundary conditions. This is combined with transfer matrices of other elements (upstream and downstream of this perforated element) to predict muffler performance like noise reduction, which is also measured. The correlation between experimental and theoretical values of noise reduction is shown to be satisfactory.

Item Type:	Journal Article
Publication:	Sadhana : Academy Proceedings in Engineering Sciences
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	16 Dec 2011 06:31
Last Modified:	16 Dec 2011 06:31
URI:	http://eprints.iisc.ac.in/id/eprint/42740

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