基于边光滑有限元的复合空腔声振特性分析  

Analysis of Vibro-acoustic Characteristics of Composite Cavity Based on Edge Smooth Finite Element Method

作　　者：陈正轩 陆静[1,2] 袁丽芸 陈莎[1] CHEN Zheng-xuan;LU Jing;YUAN Li-yun;CHEN Sha(School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China;Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Liuzhou 545006, China)

机构地区：[1]广西科技大学机械与汽车工程学院,柳州545006 [2]广西汽车零部件与整车技术重点实验室,柳州545006

出　　处：《科学技术与工程》2022年第10期3913-3919,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51665006);广西科技大学研究生教育创新计划(GKYC202001)。

摘　　要：由于色散误差和单元离散的影响,传统有限元法在分析弹性空腔中高频声振特性时计算效率和计算精度较差。采用边光滑有限元法建立空腔的声场模型,并利用GHM(Golla-Hughes-McTavish)模型模拟黏弹性材料,考虑弹性空腔、约束层阻尼结构(constrained layer damping,CLD)以及腔内声场之间的多场耦合,建立了二维CLD弹性空腔的数值模型,分析了复合空腔的声振耦合特性。数值算例表明,在低频范围内本文所建立的混合有限元模型的计算精度与传统有限元模型相当,中高频率范围内本文模型的计算精度和稳定性优于传统有限元法。Due to the influence of dispersion error and element dispersion,the computational efficiency and accuracy of the traditional finite element method are poor in the analysis of middle and high frequency acoustic-vibration coupling characteristics of the elastic cavity.The acoustic field model of the cavity was established by the edge smoothing finite element method,and the viscoelastic material was simulated by the GHM model.Considering the multi-field coupling between the elastic cavity,the structure of the constrained layer damping(CLD)and the acoustic field in the cavity,a numerical model of the two-dimensional CLD elastic cavity was found,and the acoustic vibration coupling characteristics of the composite cavity were analyzed.Numerical examples show that the computational accuracy of the hybrid finite element model is equivalent to that of the traditional finite element model in the low frequency range,while the computational accuracy and stability of the proposed model are superior to that of the traditional finite element method in the middle and high frequency range.

关 键 词：边光滑有限元法 复合空腔 声振耦合 约束层阻尼结构 GHM模型 

分 类 号：TB535[理学—物理]