新型球式稳定平台内框架的模态分析与优化  

Model analysis and optimization of internal framework of new type spherical stabilized platform

作　　者：孙路伟[1] 武秀东[1] 吕琼莹[1] 海智渊 

机构地区：[1]长春理工大学机电工程学院,吉林长春130022

出　　处：《机电工程》2014年第3期350-353,共4页Journal of Mechanical & Electrical Engineering

摘　　要：针对新型球式稳定平台光电设备视轴稳定的问题和其内框架动态性能的研究,通过Pro/E软件建立了内框架与光电设备的装配三维模型,利用ANSYS Workbench软件,对新型球式稳定平台内框架进行了有限元分析。通过对内框架和光电设备进行有限元网格划分、设置各项材料参数、添加边界条件等一系列步骤,计算出了内框架的前五阶固有频率和振型,在前五阶模态振型云图中找出了内框架最薄弱的部分,从而检查出所设计的新型球式稳定平台不在关心的频率范围内发生共振,符合设计要求。研究结果表明,有限元模态分析对于优化系统的动态性能是十分有效的,它能够确保新型球式跟踪平台远离共振失效。根据计算结果提出修改意见,可以为以后新型球式稳定平台的整体动态性能的优化改善提供理论基础。Aiming at the stabilization of the line of sight（LOS） of electro-optical（EO） of the new type spherical stabilized platform and the study of the dynamic performance of system＇s framework,the 3D model of the framework and the EO was built by Pro/E software,at the same time,the modal analysis of the internal framework and the EO of the new type spherical stabilized platform was done by ANSYS Workbench software.The first five natural frequencies and mode shapes were calculated through finite element mesh,setting the material parameters,adding boundary conditions and a series of steps about the internal framework,it was found out that the frequency of the design of the new type spherical platform was not in the frequency range of resonance,the requirements of design was satisfied by identifying the weakest part of the framework in the first five modes of the natural frequency.The results show that,the finite element method（FEM） analysis is an effective tool to optimize the system＇s dynamic performance to assure the optimal working conditions far from the resonating failure.According to the result of the calculation,the modifications to the design are presented for the future improving of the new type spherical stabilized platform to the overall dynamic performance and it provides a theoretical basis about the design of the new type spherical stabilized platform.

关 键 词：球式稳定平台 模态分析 固有频率 有限元法 

分 类 号：TH122[机械工程—机械设计及理论]