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Non-Negative Intensity for Structures with Inhomogeneous Damping

School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia

E-mail Address: daipei.liu@unsw.edu.au

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Steffen Marburg

Chair of Vibroacoustics of Vehicles and Machines, Department of Mechanical Engineering, Technische Universität München, Boltzmannstraße 15, 85748 Garching, Germany

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Christian Geweth

Chair of Vibroacoustics of Vehicles and Machines, Department of Mechanical Engineering, Technische Universität München, Boltzmannstraße 15, 85748 Garching, Germany

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, and

Nicole Kessissoglou

School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia

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https://doi.org/10.1142/S2591728518500500Cited by:11 (Source: Crossref)

This article is part of the issue:

Special Issue on Advances in Finite and Boundary Element Methods (II); Edited by M. Kaltenbacher, S. Marburg, M. Ochmann and R. Piscoya

Abstract

In this work, numerical methods to identify the surface areas of a vibrating structure that radiate sound are implemented for cases of structures with inhomogeneous distributions of viscous Rayleigh damping. The intensity-based techniques correspond to acoustic intensity evaluated in terms of the acoustic pressure and particle velocity, non-negative intensity evaluated in terms of the acoustic impedance matrix obtained at the structural surface, and back-calculated non-negative intensity evaluated in terms of the acoustic impedance matrix obtained at a far-field receiver surface. Different configurations of inhomogeneous damping are applied to two elastic structures corresponding to a plate and a cylindrical shell. To examine the influence of inhomogeneous damping on sound radiation, the acoustic intensity on the structural surface, the acoustic intensity on several different far-field receiver surfaces, non-negative intensity and back-calculated non-negative intensity are numerically compared for different inhomogeneous damping cases.

Keywords:

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Vol. 27, No. 01

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History

Received 4 February 2018

Accepted 5 August 2018

Published: 7 September 2018

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This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited.

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Non-Negative Intensity for Structures with Inhomogeneous Damping

Abstract

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