具有平行四边形截面的杆类结构波动特性分析

发布时间：2019-06-01 16:47

【摘要】：超声导波无损检测技术具有高效、快捷、灵敏等特点,应用前景广泛。复杂结构的无损检测方案,需要根据结构中超声导波传播特性分析结果进行优化选取。针对平行四边形截面杆,采用同时满足平行四边形域基本方程及斜边边界条件的斜坐标系,建立了完整的平行四边形杆的波动力学方程。采用分向半解析法,计算得到了平行四边形杆中超声导波的频散曲线,并分别研究了斜坐标系角度、对角线之比和邻边边长之比对纵向、扭转模态频散特性的影响规律。最后,通过导波激励、接收实验,验证了计算所得结论的正确性。
[Abstract]:Ultrasonic guided wave nondestructive testing technology has the characteristics of high efficiency, rapidity and sensitivity, and has a wide application prospect. The nondestructive testing scheme of complex structure needs to be optimized according to the analysis results of ultrasonic guided wave propagation characteristics in the structure. For the parallelogram section rod, the complete wave dynamics equation of the parallel quadrangle bar is established by using the oblique coordinate system which satisfies the basic equation of the parallel quadrangle domain and the oblique boundary condition at the same time. The dispersion curves of ultrasonic guided waves in parallel quadrangle bars are calculated by using the split-direction semi-analytical method, and the effects of oblique coordinate system angle, diagonal ratio and adjacent edge length ratio on longitudinal and torsional modal dispersion characteristics are studied respectively. Finally, the correctness of the calculated results is verified by guided wave excitation and receiving experiments.
【作者单位】：北京工业大学机械工程与应用电子技术学院;安徽理工大学理学院;
【基金】：国家自然科学基金(11132002)项目资助
【分类号】：TG115.285

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