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Guided waves in elastic rectangular bars:A solution using partial plate mode decomposition
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作者 FENG Feilong SHEN Zhuangzhi +1 位作者 SHEN Jianzhong LU Chao 《Chinese Journal of Acoustics》 CSCD 2019年第2期178-188,共11页
Similar to Auld's solution for Lamb waves,the wave modes in elastic rectangular bar are solved by partial wave decomposition method.The partial waves are composed of plate modes with the same wavenumber component ... Similar to Auld's solution for Lamb waves,the wave modes in elastic rectangular bar are solved by partial wave decomposition method.The partial waves are composed of plate modes with the same wavenumber component in waveguide longitudinal direction,thus free boundary conditions on one pair of opposite surfaces are automatically satisfied.Based on completeness assumption and orthogonality of the plate modes,four independent eigenequations are eventually derived for dispersion curve and mode shape investigation.Numerical evaluation shows the calculated results are in consistent with the FEM results.It is then verified that the plate modes which obliquely bounced back and forth between the two opposite surfaces compose the guided modes traveling in the rectangular waveguides with certain wave numbers in transversely resonant cases. 展开更多
关键词 GUIDED WAVES RECTANGULAR BARS mode decomposition
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