Numerical analysis of the 2D acoustic field with epistemic uncertainty

查看全文 作　　者：LIU [1]Zuojun;YU [1]Dejie;WANG [1]Hanbei;CHEN [1]Ning;XIA [1]Baizhan

机构地区：[1]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University Changsha 410082

出　　处：《Chinese Journal of Acoustics》索引2017年第36卷第1期,共15页

基　　金：supported by the National Natural Science Foundation of China(11572121);Independent Research Project of State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body(71375004) 摘　　要：Aiming at the problem that the epistemic uncertain parameters exist in an acoustic field,an evidence theory-based finite element method(ETFEM) is proposed by introducing the evidence theory,in which the focal element and basic probability assignment(BPA) are used to describe the epistemic uncertainty.In order to reduce the computational cost,the interval analysis technique based on perturbation method is adopted to acquire the approximate sound pressure response bounds for each focal element.The corresponding formulations of intervals of expectation and standard deviation of the sound pressure response with epistemic uncertainty are deduced.The sound pressure response of a 2D acoustic tube and a 2D car acoustic cavity with epistemic uncertain parameters are analyzed by the proposed method.The proposed method is verified through the comparison of the analysis results of random acoustic field with that of epistemic uncertain acoustic field.Numerical analysis results show that the proposed method can analyze the 2D acoustic field with epistemic uncertainty effectively,and has good prospect of engineering application. 关键词：不确定性参数数值分析声场二维概率分配函数证据理论不确定参数有限元法

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Numerical analysis of the 2D acoustic field with epistemic uncertainty

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