摘要
从理论研究和应用研究两个方面追踪了国内外关于能量有限元的发展现状,并指出能量有限元已趋向于预示越来越复杂的结构动响应;接下来介绍本课题组近年来利用能量有限元方法针对实际复杂结构及复杂载荷环境中的高频动响应问题所做的研究工作,主要包括3个部分:一是在考虑多种传递波功率流耦合的情况下,发展了圆柱壳、截锥壳等复杂结构的高频响应能量有限元方法,从而得到了此类结构的中高频局部动响应特性;二是考虑在脉动载荷、混响室等复杂环境中,利用能量有限元方法并结合能量边界元方法预示了结构的高频振动特性和声振耦合特性;三是开发了能量有限元的计算软件,为其大规模应用奠定了基础。最后指出了能量有限元方法目前存在的问题和进一步研究的方向。
In this paper, recent researches about basic theory and applications of EFEM are reviewed, which indicate that the development direction of this method tend to predict the dynamic response of complex structures under the complex environments. Then, towarding to this tendency, the achievements of our research group are presented, which focus on predict the dynamical response of actual complex mechanical structures excited by complex external excitation in practical. There are three main aspects are referred： the first section is that the EFEM to predict the response of complex structures is developed by us when the power flow transfer of multi-waves considered, such as the cylindrical shell and truncated conical shell, and this method help us to ob- tain the local detail response of complex structures in mid and high frequency range; the second part is that we extend the EFEM to predict the vibro-acoustical characteristics of complex structures under the complex excita- tions, including the fluctuate pressure load and the acoustic load in reverberation chamber; the last section is that we develop the EFEM solver and the application platform, which facilitate the further practical applications of EFEM greatly. At the end of this paper, tbe problems to be solved and feasible research contents in the future of EFEM are pointed out briefly.
出处
《中国工程科学》
北大核心
2013年第1期106-112,共7页
Strategic Study of CAE
基金
国家自然科学基金面上项目(11172222)
"教育部长江学者与创新团队发展计划"项目(IRT1172)
关键词
中高频响应
能量有限元方法
声振响应预示
机械结构
动力学
mid and high frequency response
energy finite element method
prediction ofvibro-acousticalresponse
mechanical structure
dynamics
