Contact-impact Analysis in Multi-body Systems Using Component Mode Synthesis
In this paper, dynamic formulation of flexible multibody systems with contact-impact is investigated.The floating frame approach is used to describe the couple of the rigid body motion and the elastic deformation of the flexible body, and the finite element method is used for discretization of the flexible bodies.With the application of the compon ent mode synthesis method, the total degrees of freedom are reduced.By using the additional constraint method, the impact constraint equations and the kinematic constraint equations are derived, and the Lagrange equations of the first kind of flexible multi-body system with variable topology are obtained.In the conventional formulation of flexible multi-body system with contact-impact, impact constraints based on the finite elements method are introduced.In order to express the impact between different bodies accurately, more elements are needed to describe the impact regions, which will significantly increase the DOFs.Since the impact is of short duration, the numerical simulation will not be efficient in small integration time step condition.Using the modal synthesis technique of the dynamic substructure method, a few low-order modal coordinates are used to replace the nodal coordinates of the inner nodes of the substructures, and meanwhile, the nodal coordinates of the local impact region are kept, therefore the total DOFs are greatly cut down and computational cost of the simulation is significantly reduced.The comparison of the simulation time shows higher efficiency of the present formulation compared with the conventional formulation since the DOFs reduces.Numerical simulation shows great efficiency of this method.
Peng Chen Jin-yang Liu Jia-zhen Hong
School of Naval Architecture,Ocean and Civil EngineeringShanghai Jiaotong UniversityShanghai,200240, School of Naval Architecture,Ocean and Civil Engineering Shanghai Jiaotong University Shanghai,20024
国际会议
上海
英文
1-5
2012-08-26（万方平台首次上网日期，不代表论文的发表时间）