Modelling of flexible members for simulation of vehicle dynamics

Advanced simulation models of vehicle dynamics consists of interconnected rigid and deformable structural members. The modelling of deformable structures as a part of simulation model can be carried out by different approaches. A relatively new approach is to employ component modes. In this approach, each deformable structural member is first modelled by finite element method with great accuracy. Next, the flexibility and inertia data of this structural member is translated to the current simulation software in the form of component modes and respective data. By this approach, the number of original degrees-offreedoms of current structural component can be reduced effectively, and thus, in many applications, the numerical efficiency enhanced without any remarkable loss of accuracy. In this report the general background for modelling deformable components is reviewed first. Especially, the component mode synthesis method and its modifications are considered. Secondly, the modelling alternatives offered by some of the simulation software products are reviewed. The software products included in this study are ADAMS, DADS, Simpack and Working Model Motion. The alternative possibilities to model deformable bodies
by these software’s are compared. Thirdly, future trends and some application examples are presented. Finally, some preliminary recommendations are given and several open questions are listed.