Development of selection methodologies and procedures of the modal set for the generation of flexible body models for multibody simulation

In this paper, a mode selection method, useful in multibody analysis and, in particular, in modal model generation of flexible body, is shown. This method is based on so called Component Mode Synthesis and, especially, on Craig and Bampton approach. It is able to identify before any multibody simulations which modes, among so called normal modes, could have high participation factor in model dynamic behaviour. The idea is to evaluate the reaction forces that each normal mode generates on connection points (boundary dofs). The methodology and the implemented procedure are shown in the paper. The procedure was carried out in a particular simulation environment (finite element and multibody codes) using routines developed in Fortran language. Lastly, an automotive test case, used to verify the implemented selection method, is shown