On Developing New Statistical Energy Methods for the Analysis of Vibration Transmission in Complex Vehicle Structures*

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Abstract
This paper presents an overview of research being conducted on vibration transmission in complex vehicle structures. Complex structures are assemblages of coupled component systems. Random parameter uncertainties in such structures can dramatically affect the high- to mid-frequency dynamics, mandating a statistical analysis. New statistical energy methods for predicting vibration transmission are explored by relaxing assumptions which limit the applications of current high-frequency techniques. Particular attention is paid to those assumptions that restrict the analysis to higher frequency ranges. A parameter-based approach that provides a more faithful representation of the structure's forced response is presented. For an example system, numerical simulations and analytical approximations based on this approach are shown to provide improved estimates of the average power transmission. This improvement is most significant in the mid-frequency range