变拓扑多体系统动力学的全局仿真

对于在运动过程中系统自由度会发生改变的变拓扑复杂机械系统，提出基本系统与当前系统的概念，采用约束激活的思想，实现系统拓扑结构在仿真过程中自动切换．以笔者开发的多体系统动力学仿真软件ＤＡＭＢ为基础，将其扩展为可进行变拓扑多体系统动力学全局仿真的软件系统．文中以某型号火箭炮系统火箭弹发射动力学的全局仿真为例说明这种方法的可行性

GLOBAL DYNAMICS SIMULATION OF MULTIBODY SYSTEMS WITH VARIABLE TOPOLOGY

New concepts, a basic system and a current system for a multibody system with variable topology, are proposed for the global dynamics simulation of the complex mechanical systems By use of technology of activation of passive constraints, the exchange of topologies of a system is automatically completed in the simulation process The software DAMB, developed by the authors is extended to simulate the whole dynamic process of a system An example, the simulation of launching of a rocket gun system, is given in the end of the paper to prove the feasibility of the method