基于分向半解析有限元法的矩形杆波动特性 |
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引用本文: | 唐楠,吴斌,刘秀成,曹海洋,何存富.基于分向半解析有限元法的矩形杆波动特性[J].北京工业大学学报,2015,41(11):1734-1742. |
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作者姓名: | 唐楠 吴斌 刘秀成 曹海洋 何存富 |
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作者单位: | 北京工业大学 机械工程与应用电子技术学院,北京 100124;安徽理工大学 理学院,安徽 淮南 232001;北京工业大学 机械工程与应用电子技术学院,北京,100124 |
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基金项目: | 国家自然科学基金资助项目 |
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摘 要: | 为了研究超声导波无损检测的技术核心,利用分向半解析有限元法对矩形杆中超声导波的频散曲线进行计算,求解了几种不同尺寸、不同物理参数的矩形杆中超声导波的相速度和群速度曲线.通过对比得出分向半解析法能够精确求解矩形杆中导波的频散特性;几何尺寸和材料参数的变化对不同导波模态的影响并不相同.最后,搭建试验装置,对具体模型进行试验验证,进一步验证了计算方法的准确性.
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关 键 词: | 分向半解析法 频散 矩形杆 |
Guided Wave Propagation in a Rectangular-rod Based on Directional Semi-analytical Method |
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Abstract: | Dispersion curves provide the fundamental information to describe the propagation of elastic waves through a structure. The directional semi-analytical method combined analytical approach with numerical method is very efficient in solving complex problems. In this paper, dispersion relations for three-dimensional waveguides with rectangular cross-section are proposed by using directional semi-analytical method. Results show that a rectangular unit can be used to compute the dispersion curves for rectangular-rod. Geometric and physical parameters can affect the dispersion curves, and the influence on different modes is different. Finally, the proposed method is proven by the experiment. |
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Keywords: | directional semi-analytical method dispersion rectangular-rod |
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