A Methodology for Improving Vehicle Suspension's Vibro-Acoustic Performance for Road Induced Noise using FBS Method

This research focuses on improving the vibro-acoustic performance of vehicle suspension. Therefore, the reduction of the transmission force from the mount point of the cross member to the input point of the vehicle body is needed. In this study, the body input force is predicted based on the Frequency Response Function Based Substructuring (FBS) method at the vehicle cross member and coupling points. A model of the substructure was developed to efficiently derive an improvement factor to reduce the transmission force. For this reason, the dynamic stiffness of the mount bush is required for estimating the force. And the dynamic stiffness is calculated indirectly by applying the inverse formulation. In order to verify the validity of the experiments performed in this study, a specially designed cross member jig and a unique suspension rig capable of directly measuring the force at the suspension mount point were employed. In this series of studies, the focal point is to verify the feasibility of the inverse formulation method in deriving the road noise improvement factor of the suspension.