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| Dynamic characteristics simulation of cracked beam |
| WU Ning-Xiang, WU Ke-Qin, YOU Mei-Yan, XIE Li-Yang |
| School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, China |
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Abstract The dynamic simulation crack models of cracked beam are introduced. And advantages of each model are analyzed. By adopting lumped flexibility model, simulation analysis of the changing characteristics of modal parameters with thecrack changing is carried out and the simulation result accords with the experimental result well. Simulation data qualitatively reflects the changing trends of natural frequency and modal shape with the crack parameters changing. Generally, it is regarded that crack located on the modal shape nodes has no effect on model parameters. However, simulation result indicates that this conclusion is not absolute. Moreover, sensitivity of beams with different geometry parameters tocrack is discussed.
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Published: 28 August 2006
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裂纹梁的动态特性仿真
介绍了裂纹梁动力仿真中的主要裂纹模型，分析了各种模型的优缺点，并应用集中柔度模型对裂纹梁的模态参数随裂纹的变化特性进行仿真分析，仿真结果和实验结果吻合较好。仿真数据定性地反映出固有频率、振型随裂纹参数的变化趋势。通常认为，位于振型节点的裂纹对模态参数没有影响，仿真结果证明这一结论并不全面。进一步探讨了不同几何参数的梁对裂纹的敏感性。
关键词：
裂纹梁,
结构动力学,
振动特性,
仿真,
损伤检测
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