摘要
利用FOAC模型理论,给出了大范围运动的大变形变截面柔性梁的位移描述,继而得到系统的机械能的高阶表述,然后基于广义Hamilton原理得到系统的动力学模型。系统模型考虑了柔性梁在不同方向的相互耦合影响,使得系统能够对较高速度的旋转刚柔耦合结构进行动力学仿真,避免了传统ZOAC模型对高速旋转柔性系统仿真结果发散的不足,从本质上分析了动力刚化作用。在此基础上,考虑热冲击对系统的动力学响应,包括梁两侧同等热冲击和不等温热冲击,为航天结构和热场环境救援机器人的动力学行为提供仿真模型。
Based on the first-order approximately coupled （FOAC） model, the displacement of the variable crosssection flexible beam with large overall motion and large deformation is derived. Then high-order expression of sys- tem mechanical energy is obtained. The dynamic model of the system is established based on the generalized Hamil- ton principle. Considering the axial-transverse coupling effect, the dynamic simulation of the higher speed system is carried out and the divergence of the simulation result of the higher speed system based on the zeroth-order approxi- mately coupled （ZOAC） model is avoided and the dynamic stiffening effect is analyzed essentially. Then the system dynamic response of thermal impact including symmetrical heat impact and nonsymmetrical heat impact is investiga- ted. The simulation model for the space structure and thermal environment rescue robot is also given. Finally, nu- merical simulation is done to indicate the effect of structure subjected to thermal impact and the utility of the model.
出处
《机械科学与技术》
CSCD
北大核心
2008年第10期1236-1241,共6页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(10772147,10572119,10632030)
高校博士点基金项目(20070699028)
陕西省自然科学基金项目(2006A07)
大连理工大学工业装备结构分析国家重点实验室开放基金项目资助
