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A number of researchers [3],[4] have shown that Statistical Energy Analysis[1] provides a useful framework for test-based noise path analysis - as well purely analytical models. This paper describes the results of a comparative study of two such models - an analytic SEA model and a test-based SEA parameter model - for predicting the Noise Reduction performance of a light truck body. First, the different power balance matrix solutions and SEA subsystem definitions are reviewed. Second the results of the two independent models are compared. For some specific cases of structure-borne noise, the test-based method is shown to be more accurate than the analytic model. Third, means by which individual measured SEA parameters can be integrated into an analytic SEA model are proposed and evaluated. Results indicate that the scope for analytical model improvement, but also highlight the need for more rigorous “consistency” in the way test-based SEA parameters are measured.

A simplified numerical approach was used to evaluate the dynamic deflections of bumper systems under impact. The analysis was performed using a nonlinear structural finite element computer code, WRECKER-F, developed by Ford Motor Company. Five cases consisting of different mesh size models and boundary conditions for the center impact by a pendulum were simulated and four cases for corner impact were studied. It was found that this simplified approach is accurate enough to be used for preliminary evaluations of bumper impact performance.