大变形柔性多体系统非线性动力学数值仿真与实验研究

提出了一种作大范围运动柔性梁的非接触动态测试技术.在基于位移的柔性多体系统几何精确建模及非线性有限元分析技术的基础上,利用EAGLE-500运动分析系统及其相应的分析软件对作大范围运动钛合金柔性梁作了实验研究,并且利用之前提出的几何精确梁理论进行数值仿真.数值仿真结果与实验结果完全吻合,验证了作者所提的几何精确梁理论及...

Numerical Simulation and Experimental Investigation on Nonlinear Dynamics of a Highly Flexible Multibody System

A non-contact dynamic testing technique for a flexible beam undergoing wide range of movement is presented in this paper. EAGLE-500 motion analysis system and its corresponding analysis software EvaRT4.6 were used to carry out experimental investigation on a flexible titanium alloy beam undergoing wide range of movement, based on the geometrically exact modeling theory and nonlinear finite element technique for a flexible multibody system. By using the former presented parameters from the geometrically exact beam theory, numerical simulation was carried out. Numerical results agree well with experimental results, with only some minor differences between both results due to the effect of air damping and non-perfect geometry of the tested beam. The feasibility of previously proposed beam theory and nonlinear finite element technique by authors for a flexible multibod system was verified. Experimental results also show that camera-based non-contact measurement technique is feasible for experimental investigation on flexible multibody systems, especially for those systems that are impossible to be tested by conventional methods due to lager deformation.