Hybrid Technique Based on Finite Element and Experimental Data for Automotive Applications 2007-01-0466

This paper presents the hybrid technique application in identifying the noise transfer paths and the force transmissibility between the interfaces of the different components in the vehicle. It is the stiffness based formulation and is being applied for the low to mid frequency range for the vibration and structure borne noise. The frequency response functions such as dynamic compliance, mobility, inertance, and acoustic sensitivity, employed in the hybrid method, can either be from the test data or finite element solution or both. The Source-Path-Receiver concept is used. The sources can be from the road surface, engine, transmission, transfer case, prop-shaft, differential, rotating components, chain drives, pumps, etc., and the receiver can be driver/passenger ears, steering column, seats, etc. The dynamic stiffness matrix, obtained by inverting the dynamic compliance, is being used as a superelement database of the main structure and is connected to the substructures by isolators or rigid bolts, depending on the attachments. Superelement has the advantage that matrices can be passed from one organization to another without revealing proprietary details or concern. This hybrid method is very efficient, economical and versatile for the automotive and aerospace applications.