Nonlinear random response of cylindrical panels to acoustic excitations using finite element modal method

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)327-345
Journal / PublicationNonlinear Dynamics
Volume31
Issue number3
Publication statusPublished - Feb 2003

Abstract

This paper investigates large amplitude multi-mode free vibration and random response of thin cylindrical panels of rectangular planform using a finite element modal formulation. A thin laminated composite doubly curved element is developed. The system equation in structural nodal DOF is transformed into the modal coordinates by the using the modes of the underlying linear system. The nonlinear stiffness matrices are also transformed into nonlinear modal stiffness matrices. Numerical integration is employed to determine free vibration and random response. Single-mode free vibration results are compared with existing classical analytical solutions to validate the nonlinear modal formulation. Nonlinear random analysis results for cylindrical panels have shown that the root mean square of panel deflections could be larger than those obtained using the linear structure theory. Time histories, probability distribution functions, power spectral densities, and phase plane plots are also presented.

Research Area(s)

  • Acoustic excitation, Curved panel, Finite element, Modal coordinates, Nonlinear random vibration