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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.
The main crack models in cracked beam dynamic simulation are introduced, the advantages and disadvantages of various models are analyzed, and the simulation results of the modal parameters of the cracked beam with the crack are given by using the concentrated flexibility model. The simulation results are in good agreement with the experimental ones Good simulation data qualitatively reflect the natural frequency and mode shape with the trend of crack parameters.It is generally believed that the mode located at the mode-shaped node crack has no effect on the modal parameters, the simulation results show that this conclusion is not comprehensive.Further explore the different Geometrical parameters of beam susceptibility to cracks.