Analysis And Optimization For The Mid-frequency Response Of Structural-acoustic System With Uncertainties By Using Adaptive Expansion Algorithm

Uncertainty exists widely in structured acoustic cavity coupling systems,and intermediate frequency response is more sensitive to uncertainty than low frequency response.The efficiency of the response analysis method and the reliability optimization method of the existing uncertain structural-acoustic system are one of the main bottlenecks restricting its engineering application.Therefore,it is of great significance for the vibration and noise control of structural sound cavity coupling system to put forward a reasonable analysis method of intermediate frequency response and accurately predict its vibration response.In this paper,the analysis method of intermediate frequency response of acoustic cavity coupling system with uncertain structure is studied.The main research contents are as follows:(1)The global sensitivity analysis of the influence of uncertain parameters on the system response shows that:(1)The influence of uncertain parameters on the system response of the structured acoustic cavity coupling system is different;(2)The nonlinear degree between different uncertain parameters and system response is different.The global sensitivity analysis is used to establish the proxy model of the acoustic cavity coupling system with uncertain structure.(2)In view of the low computational efficiency of the existing intermediate frequency response analysis methods for the acoustic cavity coupling system with uncertain structures,an uncertain Finite ElementStatistical Energy Analysis(FE-SEA)method based on Anisotropic Adaptive Sparse moment-based Arbitrary Polynomial(AASMAPC)expansion method is proposed to effectively improve the computational efficiency of the intermediate frequency response analysis method for the acoustic cavity coupling system with uncertain structures.(3)Spoke coupling in view of the uncertainty structure system reliability optimization problem solving efficiency is too slow,introducing AASMAPC expansion method random-interval reliability optimization model,put forward the model based on sparse agent efficient reliability optimization method has high precision,lightweight design requirements,and to consider in this paper,the proposed method was applied to the subway interior noise simulation optimization.In this paper,an efficient and high-precision algorithm for analysis and optimization of intermediate frequency response of acoustic cavity coupling system with uncertain structure is proposed,which provides an effective technical means for vibration and noise reduction in traffic and engineering fields.