摘要
抛物面天线作为卫星上重要的功能组件,是实现遥感测量和无线通信等功能的基础。为了解决模块化抛物面天线折展机构构型设计与刚度匹配困难的问题,提出一种基于剪刀机构的肋单元折展机构的构型方法,并设计了肋单元折展机构。通过运动学分析,验证了该机构通过参数的修改,可以实现同一折展机构展开状态包络不同抛物面拟合球面。给出一种包络锥法实现多模块折展机构展开过程的求解思路,为可转动肋单元的运动副配置提供依据。构建多模块折展机构的有限元模型,以提高固有频率和降低整体质量为优化目标,对肋单元折展机构的构型参数进行优化。采用非劣排序遗传算法完成优化迭代计算,得到具有高刚度、轻量化的折展机构设计参数,在相同条件下优化后调和平均固有频率提高了67.4%,天线整体质量下降了35.2%。
As an important functional component of a satellite,a parabolic antenna is a basis for realizing remote sensing measurement and wireless communication.In order to solve the difficulty of configuration design and stiffness matching of modular parabolic antenna deployable mechanism,a configuration method of rib element deployable mechanism based on scissors mechanism is proposed,and the rib element deployable mechanism is designed.Through kinematic analysis,it is verified that the same deployable mechanism can envelope different paraboloid-fitted spheres through the modification of parameters.The configuration of kinematic pairs of rotatable rib parts is based on a concept for solving the unfolding process of the multi-module deployable mechanism by the envelope cone approach.The configuration parameters of the rib element deployable mechanism are improved to increase natural frequency and decrease overall quality,and the finite element model of the multi-module deployable mechanism is built.The non-inferior sorting genetic algorithm is used to complete the optimization iterative calculation,and the design parameters of deployable mechanisms with high structural stiffness and lightweight are obtained.Under the same conditions,the harmonic average natural frequency is increased by 67.4%,and the overall quality of the antenna is reduced by 35.2%after optimization.
作者
何天宇
董洋
王辉
赵军鹏
王春洁
HE Tianyu;DONG Yang;WANG Hui;ZHAO Junpeng;WANG Chunjie(School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China;State Key Laboratory of Virtual Reality and Systems,Beihang University,Beijing 100191,China)
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2023年第9期2473-2481,共9页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金(51635002)。
关键词
模块化抛物面天线
构型综合
运动学分析
有限元分析
优化设计
modular parabolic antenna
configuration synthesis
kinematic analysis
finite element analysis
optimal design
