柔性多体系统碰撞动力学建模理论及仿真算法的研究

The research on the modeling and its relative numeric algorithm of the Variable-Structure and impact dynamic.systems is the most important basis for solving the complicated engineering problems especially in aerospace.industry. The traditional method to cope with the impact between bodies in multi-body system dynamics has its.limitation, for example the restitution coefficient of the impact is commonly determined by the impact test of two.particles. The tangential movement in collision is often conformed with the Whittaker assumption. The more.problems are often induced when the impact process is included in multi-body dynamic systems, such as the.various movements stored in collision body, the precision of numeric simulation and its stability of the dynamic algorithm to deal with impact process. This project takes a series research work to the above problems. Breaking through some basic assumptions adopted in classical impact mechanics, a reasonable and efficient impact model.considering the friction effects and the structure flexibility effects is established. Combined with the multi-body dynamic theory, the Variable-Structure and impact dynamic theory is systematicly developed and applied in the deployment mechanism with joint clearance. This work is the foundation for developing Variable-Structure and impact dynamic theory. The relative test research verified the correct of the theory. We have published 6 papers about this project in domestic academic magazines, and an invited report is pressed in a nationwide conference proceeding. The achievement of this research is truly and honest, and it has not only vital significance in science, but also has important value in engineering application. Keywords: Impact, Variable Structure, Multibody Dynamics, Clearance, Friction..二、研究计划要点及执行情况概述：.本项目按照“计划执行书”的目标，突破经典碰撞动力学理论中的一些基本假定，以弹.性接触理论为基础，考虑摩擦及碰撞体柔性的影响，建立合理有效的碰撞接触模型，并研究.稳定可靠的数值算法。实际研究表明，经典碰撞理论中的恢复系数的定义及切向运动的描述.在很多情况下不能满足变结构与碰撞动力学分析的要求，当多体系统嵌入碰撞与变结构The research on the modeling and its relative numeric algorithm of the Variable-Structure and impact dynamic.systems is the most important basis for solving the complicated engineering problems especially in aerospace.industry. The traditional method to cope with the impact between bodies in multi-body system dynamics has its.limitation, for example the restitution coefficient of the impact is commonly determined by the impact test of two.particles. The tangential movement in collision is often conformed with the Whittaker assumption. The more.problems are often induced when the impact process is included in multi-body dynamic systems, such as the.various movements stored in collision body, the precision of numeric simulation and its stability of the dynamic algorithm to deal with impact process. This project takes a series research work to the above problems. Breaking through some basic assumptions adopted in classical impact mechanics, a reasonable and efficient impact model.considering the friction effects and the structure flexibility effects is established. Combined with the multi-body dynamic theory, the Variable-Structure and impact dynamic theory is systematicly developed and applied in the deployment mechanism with joint clearance. This work is the foundation for developing Variable-Structure and impact dynamic theory. The relative test research verified the correct of the theory. We have published 6 papers about this project in domestic academic magazines, and an invited report is pressed in a nationwide conference proceeding. The achievement of this research is truly and honest, and it has not only vital significance in science, but also has important value in engineering application.

经典碰撞假定下的多体系统碰撞动力学，既不能确定碰撞力的大小，也不能正确计算斜碰撞下的碰撞冲量。本项目将突破经典碰撞假设，以弹性接触理论为基础，考虑摩擦及碰撞体柔性的影响，建立合理有效的碰撞接触模型，计算碰撞力的历程及碰撞总冲量，研究稳定可靠的数值算法。用模型实验对理论和计算进行验证。本项目具有重要的科学意义和应用价值。