计算力学学报2016，Vol.33Issue(4)：564-569,6.DOI:10.7511/jslx201604022
带裂纹旋转柔性梁系统的刚柔耦合动力学研究
Rigid-flexible coupling dynamic analysis of a rotating flexible beam with cracks
摘要
Abstract
The effect of a crack on the dynamic behaviors of a rotating flexible beam system with rigid-flexible coupling effect is investigated through the application of a lattice spring model (LSM).Based on the local flexibility theory of cracks,the flexural stiffness of the cracked section is represented by a massless rotational spring,and then the first-order approximate coupling model of the rotating flexible beam is established,which takes account of the nonlinear coupling between transverse and longitudinal deformations.Numerical results show that the presence of the crack lowers the natural frequencies of the rotating flexible beam,and as the rotation speed of beam increases,the impact of the crack on the natural frequencies becomes weakens.In particular,a positive correlation between the natural frequencies and the bending moment at the crack is discovered.In addition,the crack can not only increase the response at the beam tip during the stage of rotation speed increase,but also has a significant impact on its oscillation amplitude during stable rotation.关键词
刚柔耦合/裂纹/晶格弹簧模型/一次近似耦合/固有频率Key words
rigid-flexible coupling/crack/LSM/first-order approximate coupling/natural frequencies分类
数理科学引用本文复制引用
蒋宪宏,邓子辰,李庆军,张凯..带裂纹旋转柔性梁系统的刚柔耦合动力学研究[J].计算力学学报,2016,33(4):564-569,6.基金项目
国家自然科学基金(11432010)资助项目 （11432010）
