摘要
在燃油泵调节器模态分析过程中,高集成装配体的模型简化和以螺钉连接为主的多种连接方式的有限元建模对分析结果的影响是一个难点。本文从实际工程应用角度出发,提出了关键子结构验证结合整体有限元建模的模态分析方法。首先,根据燃油泵调节器的结构特点对模型进行简化和网格处理;然后,开展了关键子结构壳体模态的仿真分析和实验测试,并在Virtual.Lab软件中对螺钉、密封圈、弹簧、紧配合和滑动配合等进行了连接方式的建模探索和多类型设置,解决了不同单元类型网格的过渡问题;在确保关键子结构有限元模型精度的前提下,最后开展了整体的有限元建模与模态特性研究,通过与实验结果的对比验证了仿真方法的可行性。结果表明:关键子结构法在处理复杂中小型结构装备的有限元分析上效果较佳,复杂结构有限元模型的连接处理方式不宜过多,否则求解不易收敛。多点约束法(Multipoint constraint method,MPC)能够高效处理非协调网格的过渡,适用小位移或变形的模型。
In the process of modal analysis of the fuel pump regulator,it is difficult to simplify the model of highly integrated assembly and establish finite element modeling of various connection modes mainly with screw connection,which have a great impact significant effect on the analysis results.From the perspective of practical engineering application,the modal analysis method of crucial substructure verification combined with global finite element modeling is proposed.Firstly,according to the structural characteristics of the fuel pump regulator,the model is simplified and meshed.Then,the crucial substructure shell modal analysis and experimental test are carried out.In the Virtual.Lab,different connection types are modeled,such as screw connection,seal ring connection,tight connection and sliding connection,and multi-type settings are carried out to solve the transition problems of different grid element types.Finally,under the premise of ensuring the accuracy of the key substructure finite element model,the overall finite element modeling and modal characteristics research are carried out,and the feasibility of the simulation method is verified by comparing with the experimental results.The results show that the crucial substructure method is better in dealing with the finite element analysis of complex small and medium-sized structural equipment,and the connection type of the finite element model of complex structure should not be too many,otherwise the solution is not easy to be converged.Multipoint constraint(MPC)method can deal with the transition of incompatible elements efficiently,and it is suitable for models with small displacement or deformation.
作者
何立强
王鹏
胡学满
HE Liqiang;WANG Peng;HU Xueman(Aero Engine Corporation of China,Beijing 100097,China;Aviation Military Representative Office of the Army Armament Department Aviation Military Representative Bureau in Shanghai,Shanghai 200000,China;Department of Mechanical and Electrical Engineering,Xiamen University,Xiamen 361102,China)
出处
《南京航空航天大学学报》
CAS
CSCD
北大核心
2021年第4期537-545,共9页
Journal of Nanjing University of Aeronautics & Astronautics
