Automotive Electric Power Steering Systems NVH Performance Investigations

This paper deals with noise and vibration problems in electric power steering systems used in modern automotive platforms. Various types of commonly used power steering systems are presented. The noise and vibration performance of new EPS designs can have a significant impact on users. Computational FEM methods used to investigate the dynamic properties mechanical systems were implemented to situationally test the NVH performance of EPS systems. Computational FEM model building procedure is presented with detailed description of crucial EPS system elements and contacts. Conventional EPS vibro-acoustic measurement techniques such as modal testing and Field Data Replication are presented alongside newer techniques such as acoustic camera measurements.