A GENERAL FORMULATION FOR THE SOUND RADIATION FROM RECTANGULAR, BAFFLED PLATES WITH ARBITRARY BOUNDARY-CONDITIONS

被引：127

作者：

BERRY, A ^{[1
]}

GUYADER, JL ^{[1
]}

NICOLAS, J ^{[1
]}

机构：

[1] INST NATL SCI APPL,LVA,F-69621 VILLEURBANNE,FRANCE

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 1990年 / 88卷 / 06期

关键词：

D O I：

10.1121/1.399682

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The radiation of sound from a baffled, rectangular plate with edges elastically restrained against deflection and rotation is analyzed. The elastic constants along the contour can be varied to reproduce simply supported, clamped, free, or guided edges as limiting cases. The formulation is based on a variational method for the vibration of the plate, and assumes no fluid loading of the structure. The elastic boundary conditions appear in the Hamiltonian of the plate through a dynamic contribution, which is expressed in terms of nondimensional edge parameters. The extremalization of the Hamiltonian is achieved using a Rayleigh-Ritz method, and both the free vibrations and the forced vibrations of the plate are presented. The radiation of sound from the plate is analyzed in the far field, and is calculated from one-dimensional Fourier transforms. Numerical results are presented for the radiation efficiency of modes of simply supported, clamped, free, and guided plates. The values found agree well with predictions of Wallace in the simply supported case, and of Gomperts in the guided case. It is found that a low deflection stiffness at the edges decreases the radiation efficiency of the elastic modes in a spectacular manner. The radiation efficiency of the rigid modes of the plate is derived analytically in low frequencies. It is seen that, when rigid motion of the plate is permitted, it is responsible for almost all the acoustical power radiated. The new case of a plate which is locally clamped along its four edges is also presented. © 1990, Acoustical Society of America. All rights reserved.

引用

页码：2792 / 2802

页数：11

共 13 条

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