Finite element study of acousto-structural interaction

Abstract

Finite element models are developed for the analysis of the response of a cylindrical shell with an enclosed acoustic cavity. Depending on the complexity of the cylindrical shell, the work falls into three areas.

Part I involves the study of the response of an unstiffened cylinder. Three finite element models, one structural and two acoustic are developed to model the problem. The second acoustic finite element is formulated with a displacement potential concept and because of the ease of coupling with the shell element it is chosen for all subsequent work.

Part II studies the interaction between a ring-stiffened cylinder and an enclosed acoustic cavity. A new ring finite element is developed to represent the stiffener. Theoretical computations involve not only the orthodox finite element analysis but the viability of other task saving concepts such as "periodic structure" and "transfer matrix" are also investigated.

The last part deals with the vibrational behaviour of an orthogonally- stiffened cylindrical shell. Three finite element models are formulated to model this structure completely. Only the in-vacuo vibrational behaviour of the shell is investigated. Justifications of this approach are outlined in the previous parts.

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