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论文类型：期刊论文

发表时间：2005-08-01

发表刊物：JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA

收录刊物：SCIE、EI、Scopus

卷号：118

期号：2

页面范围：800-805

ISSN号：0001-4966

摘要：A state-space coupling method is presented for the direct solution of fluid-loaded natural frequencies and mode shapes of plates. This method expands the frequency-dependent term in the Rayleigh integral in a power series on circular frequency. After factoring out the frequency term from the integrands, integration involved in setting up the acoustic impedance coefficient matrices is confined to a frequency-independent part. The acoustic impedance coefficient matrices are therefore frequency-independent and can be coupled directly with the structural matrix into a canonical state-space form to yield the fluid-loaded modes via the direct eigenvalue analysis. A fluid-loaded stiffened plate is involved to demonstrate the method. Numerical results of the fluid-loaded natural frequencies, mode shapes, and modal damping ratios are given to show the efficacy of the state-space coupling method. (C) 2005 Acoustical Society of America.