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Wave Propagation in Fluid Loaded Periodic Structures

by Michael L. Accorsi, Univ of Connecticut, Storrs, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract:

Periodic structures, such as rib stiffened plates or cylindrical shells, are frequently used as major structural components in naval and aerospace applications. For these applications, the acoustic design is often an important consideration. It is well known that periodic structures act as mechanical filters, which allow waves to propagate in certain frequency ranges known as pass bands and prevent wave propagation in other frequency ranges known as stop bands. Analysis of wave propagation in such structures is an effective means for performing the acoustic design. In the current work, a finite element based method is developed for analysing free wave propagation in one dimensional periodic structures with fluid loading. By exploiting the periodicity, an extremely efficient and accurate computational tool is developed. Because the method is finite element based, excellent modelling capability is possible (for example, detailed modelling of stiffener geometry).

Subject Headings: Finite element method | Wave propagation | Structural analysis | Stiffening | Shell structures | Mathematical models | Fluid mechanics

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