A Partition Finite Element Method Allowing the Calculation of the Vibro-Acoustic Response of Fully Trimmed Vehicles in Medium Frequency Range

摘要

A practical partition approach, allowing the computation in the medium frequency range of the vibro-acoustic response of a fully trimmed passenger car, is presented. It has the advantage of limiting the storage memory needed for the structural model base of the vehicle. The car structure is divided in parts coupled either with the passenger compartment or with the trimming components. Calculations are performed by separately importing each structure part with its associated modal base; the global modal base is restricted to the considered part. The size reduction of the structural modal basis allows an increase of the upper frequency limit to cover the medium frequency range without requiring more hardware resources. The proposed approach is first validated by a simple model and then applied to a fully trimmed car.