关键词: 声固耦合模型, 高频分析, 不确定性, 随机模型, 统计能量法

Abstract: In order to solve the uncertainty problems of vehicle statistical energy analysis, a stochastic uncertainty statistical energy method for vehicle acoustic-structural coupling model was proposed. In this method, structural and acoustic cavity material parameters were taken as uncertain variables. A statistical energy model of acoustic-structural coupling system was built. Both of damping loss factors and coupling loss factors were calculated. Their partial derivatives with respect to material parameters were analyzed. Based on the theory of stochastic algorithm, the formulas for calculating the mean and standard deviation of noise were derived under uncertain material parameters. The stochastic uncertain statistical energy method was applied to simple plate cavity model and car firewall cavity model respectively, and the noise fluctuation characteristics of the model were solved under uncertain conditions successfully.

Key words: acoustic-structural coupling model, high frequency analysis, uncertainty, stochastic model, statistical energy method