MOR for friction induced self-excitation in jointed structures based on substructuring for nonlinear interfaces - a review of methods with application to brake squeal

摘要

The modelling and simulation of friction induced NVH-problems is still a challenging task due to the high complexity and sensitivity of the problem. Today, linear stability analyses of large-scales FE-models have become state of the art in industrial applications. However, the so-called Complex-Eigenvalue-Analysis (CEA) provides information for steady states without considering the nonlinear impact of e.g. joints or contacts. Thus it has become evident that reliable analyses include nonlinearities. To assess nonlinear systems it is necessary to reduce the models to a practicable size. This contribution aims on comparing different substructuring techniques with regard to their applicability to stability problems appearing in the field of friction-induced vibrations. To this end a model structure under frictional self-excitation and employed dynamic substructing is investigated by comparing results from a linearized approach via eigenvalue analysis to those from direct time integration of the nonlinear model.