基于虚拟样机技术的刚柔耦合系统动力学仿真

基于集成CAD、CAE与可视化技术的虚拟样机技术,提出一种刚柔耦合系统动力学建模与仿真的方法.根据刚柔耦合动力学方程,建立计及刚体运动与弹性变形的系统虚拟样机.对于运动副间隙、摩擦力以及制造误差引起的建模与仿真误差,通过对比试验结果选择系统特征参数为修正因子进行调整,从而补偿以上因素对建模和仿真精度的影响.利用三维实体建模技术、有限元技术以及多体动力学分析,依照虚拟样机仿真和试验的建模仿真流程,完成了曲柄滑块机构的刚柔耦合动力学仿真实例.与试验对比结果表明建模方法和仿真流程的有效性和实用性.

Dynamics Simulation of Flexible-Rigid Mechanism Based on Virtual Prototyping Technology

Virtual Prototyping (VP) technology is a multidisciplinary and leading-edge focus which integrates CAD, CAE and visual technologies, etc. Usually, better simulation result can be obtained by using the VP technology. A modeling method for dynamics simulation of flexible-rigid mechanism was proposed. Based on dynamics equations of flexible-rigid system, the virtual prototyping of mechanism was constructed. In order to improve the accuracy of model and the reliability of simulation, the coupling of rigid-body movement and elastic deformation was considered. Errors caused by joint clearance, friction force and manufacturing would apparently affect the simulation result. Therefore, it is feasible that some characteristic parameters of system are adjusted according to experiment data. Then the adjustment of these systematic parameters could compensate the influence of the above factors. The modeling and simulation flow were detailedly discussed based on VP simulation and experiment results. A technological application of crank-slider mechanism demonstrated the validity of the presented method. The model for dynamics simulation was constructed by integrating 3D entity modeling, finite element method(FEM) and multi-bodies system(MBS) technology. Comparison between simulation solutions utilizing this method and experiment results shows a good agreement.