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This paper describes an effective method with statistical energy analysis (SEA) for specifying the vehicle sound proof package that achieves the best balance between light weight and high sound insulation performance. For proposing the sound proof package in the early stages of vehicle development, it is necessary to assess a number of specifications and to pick the best design specifications for weight and sound proof performance. However, there are difficulties in achieving conflicting objectives simultaneously, and acoustic engineers need special technical know-how. In this study, a new automated optimization method is proposed that approaches the problem above. As a result, detailed sound insulation package specifications, including the thickness distribution of each part, can be obtained and these can be easily transferred to drawings. Moreover, the accuracy of this method is proven by a reduction in vehicle interior cabin sound pressure level

A prediction tool based on the transfer matrix approach is applied for calculating the effects of the sound package on acoustic cavities damping and on trimmed panels coupling loss factors, needed for SEA modelling of vehicles. Predicted TL and absorption of trimmed components are compared to measurement results. The tool allows calculating, outside the SEA software, the needed quantities for multi-layered insulation components, by taking into account also the non-uniformity of the insulation part and of the structure. This feature is crucial, especially in all cases, in which SEA models are used to design and optimise the vehicle acoustic package.

This paper describes an effective method of developing a soundproof package, which balances both light weight and high noise insulation performance. Since it is required to propose design of sound insulator in the early stages of the development, the hybrid statistical energy analysis (SEA) modeling method is applied, which is practical for high frequency analysis. Also an acoustic characteristic estimation technique of the multi layer structures is used. As a result of applying these effective methods, the 2006 brand-new vehicle categorized as C has enhanced in road noise quietness and decreased in weight as compared with the previous model.