A Proposal of Dynamic Behaviour Design Based on Mode Shape Tracing: Numerical Application to a Motorbike Frame

A modal based method to design and to improve the dynamic behaviour of flexible multibody systems is proposed in this paper. The dynamic behaviour of a flexible multibody system depends on the dynamics of its components and on the effects of the connections. When dynamics problems are experienced in particular working conditions, changes to the design are required. Usually connections are standard and there is not space for changes, therefore the components should be improved. Changes at components level improve the global system behaviour, but it is not so easy to identify the most effective component for each specific case. The purpose of the proposed method is to identify the most influent components in specific working frequency ranges of a multibody system. The method is based on a hierarchical procedure from assembly to components which leads to the identification of the components to be modified in order to improve assembly performance.