Multi-variable approach of contact-impact issue in variable topology system
In multi-body systems, contact-impact processes occur in most cases.Sub-periods and sub-regional methods are frequently used recently, different coordinates introduced in both of the approaches.However, the sub-regional method seems to be more effective.Floating frame of reference formulation is widely used for contact treatment, which describe displacements by the rigid body motion and a small superposed deformation, and the coordinate depicted the deformation includes finite element nodal coordinates and modal coordinates, the former deals with the contact/impact region, and the later describes the non-contact region.Free interface substructure method is used in modeling, and the dynamic equation of a single body is derived.Then, using the unidirectional recursive method, the dynamic equations of multi-body systems are established.Furthermore, contactimpact areas are treated through additional constraint equations and Lagrange multipliers.Using such approach, efficiency and accuracy are guaranteed, with the modal truncation and unidirectional recursive methods, it reduces the number of system coordinates and the dimensions of mass matrix.Especially, the latter effectively reduced the constraint equations of system and it formed smaller scale of DAEs.FEM method in the local contact region can deal with contact/impact between arbitrarily complex interfaces.Although the additional constraint equations lose some efficiency when solving equations, but more accurate constraint force can be calculated.
Jiabei Shi Jiazhen Hong Zhuyong Liu
School of Naval Architecture,Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai,200240 School of Naval Architecture,Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai,2002
国际会议
上海
英文
1-7
2012-08-26（万方平台首次上网日期，不代表论文的发表时间）