A Modification of the SEA Equations: A Proposal of how to Model Damped Car Body Systems with SEA

The assumption of diffuse (constant) field response limits the applicability of SEA for analysis of structure-borne sound in automotive structures as these are damped and, thus response decay with distance.

A relatively simple modification of the SEA equations can be shown to solve the problem of decay with distance across subsystems. It appears that the modification can be implemented into SEA software without too much problem.

An analytical model is used to demonstrate the errors when the conventional SEA approach is used and the merit of modified SEA equations. A generic firewall, car floor and rear wall is used as showcase.