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Prediction of breakout noise from an elliptical duct of finite length

Munjal, ML and Gowtham, GSH and Venkatesham, B and Reddy, Hari Krishna M (2010) Prediction of breakout noise from an elliptical duct of finite length. In: Noise Control Engineering Journal (NCEJ), 58 (3). pp. 319-327.

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Abstract

This paper describes a predictive model for breakout noise from an elliptical duct or shell of finite length. The transmission mechanism is essentially that of ``mode coupling'', whereby higher structural modes in the duct walls get excited because of non-circularity of the wall. Effect of geometry has been taken care of by evaluating Fourier coefficients of the radius of curvature. The noise radiated from the duct walls is represented by that from a finite vibrating length of a semi infinite cylinder in a free field. Emphasis is on understanding the physics of the problem as well as analytical modeling. The analytical model is validated with 3-D FEM. Effects of the ovality, curvature, and axial terminations of the duct have been demonstrated. (C) 2010 Institute of Noise Control Engineering.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The Institute of Noise Control Engineering of the USA (INCE/USA).
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 08 Sep 2010 11:17
Last Modified: 19 Sep 2010 06:14
URI: http://eprints.iisc.ernet.in/id/eprint/31322

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