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A Numerical Method for Analysis of the Sound and Vibration of Waveguides Coupled with External Fluid  

Ryue, Jung-Soo (울산대학교 조선해양공학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.29, no.7, 2010 , pp. 448-457 More about this Journal
Abstract
Vibrations and wave propagations in waveguide structures can be analysed efficiently by using waveguide finite element (WFE) method. The WFE method only models the 2-dimensional cross-section of the waveguide with finite elements so that the size of the model and computing time are much less than those of the 3-dimensional FE models. For cylindrical shells or pipes which have simple cross-sections, the external coupling with fluids can be treated theoretically. For waveguides of complex cross-sectional geometries, however, numerical methods are required to deal with external fluids. In this numerical approach, the external fluid is modelled by the boundary elements (BEs) and connected to WFEs. In order to validate this WFE/BE method, a pipe submerged in water is considered in this study. The dispersion diagrams and point mobilities of the pipe simulated are compared to those that theoretically obtained. Also the acoustic powers radiated from the pipe are predicted and compared in both cases of air and water as an external medium.
Keywords
Waveguide Finite Element Method; Waveguide Finite Element/Boundary Element Method; Fluid Coupling; Pipe; Dispersion Diagram; Point Mobility;
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Times Cited By KSCI : 1  (Citation Analysis)
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