Structural-acoustic modal coupling analysis and application to noise reduction in a vehicle passenger compartment

A practical method for noise reduction is proposed and is applied to the in terior noise problem of a vehicle passenger compartment. The proposed metho d is based upon the structural-acoustic response model, in which the interi or pressure is explicitly described in terms of the modal parameters and st ructural-acoustic modal coupling coefficients of the car body and compartme nt system. Considering only a few modes and modal coupling coefficients whi ch have large contributions, the cause of the noise peal: can be easily ide ntified and the reduction procedure can be simplified compared with the con ventional finite element analysis method. In addition, the use of experimen tal data reduces some inevitable errors in the numerical analysis and refin es the numerical predictions in noise problems. These procedures are carrie d out by using a user-friendly computer program (ACSTAP) which has been dev eloped during the course of this study. (C) 1999 Academic Press.