Specification of Modal Participation Factors in Acoustic Scattering Problems

Shock and Vibration, Jul 2018

Using the wet modes of a submerged structure as expansion functions, it is shown how the scattered far-field pressures induced by an incident harmonic wave may be modified in a prescribed manner. This is done by applying forces directly to the structural surface, which superposes a radiated pressure field on the scattered one. By appropriate choice of the applied nodal forces, modal participation factors associated with any combination of mode shapes may be controlled. The method is illustrated by a numerical example.

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Specification of Modal Participation Factors in Acoustic Scattering Problems

Specification of Modal Participation Factors in Acoustic Scattering Problems M. Ettouney,1 R. Daddazio,1 and F. DiMaggio2 1Weidlinger Associates, Inc., Applied Science Division, 333 Seventh Avenue, New York, NY 10001, USA 2Columbia University, Department of Civil Engineering and Engineering Mechanics, New York, NY 10027, USA Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Using the wet modes of a submerged structure as expansion functions, it is shown how the scattered far-field pressures induced by an incident harmonic wave may be modified in a prescribed manner. This is done by applying forces directly to the structural surface, which superposes a radiated pressure field on the scattered one. By appropriate choice of the applied nodal forces, modal participation factors associated with any combination of mode shapes may be controlled. The method is illustrated by a numerical example.


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M. Ettouney, R. Daddazio, F. DiMaggio. Specification of Modal Participation Factors in Acoustic Scattering Problems, Shock and Vibration, DOI: 10.3233/SAV-1993-1107