摘要
针对传统固面可展开天线中旁瓣绕双转轴独立折展造成的系统同步性差及可靠性低的问题,设计并分析了一种单自由度折展方案。首先提出了基于粒子群算法的收拢态位姿确定算法,结合等效轴角定理给出了单自由度旋转展开的参数确定方案;以相邻旁瓣运动轨迹为基础,结合变密度拓扑优化方法给出了反射器背架设计方案,分析结果表明本文所设计背架可使反射器热变形降低62.5%,基频提高了4倍,充分证明了背架设计的有效性。以一款10 m口径固面可展开天线为对象进行了折展机构设计,并分析了折展过程中运动学、动力学参数变化规律。基于螺旋理论对折展机构进行分析,得出了多种消极运动副引入方案,并最终选取RSPRR进行机构非过约束设计。分析结果表明,本文所述的固面可展开天线可以完成收拢态与展开态之间的切换,收纳率达到了0.384,折展过程平稳可靠,验证了该设计方案的可行性。同时,相关研究方法及结论可以为固面可展开天线的设计提供技术参考。
This study designs a deployment mechanism based on the Bennett mechanism to address the synchronization and reliability issues of solid surface deployment antennas(SSDAs)caused by independent rotation around two axes.First,a position determination algorithm for the antenna petal based on a particle swarm optimization algorithm is proposed.Combined with the axis-angle theorem,the parameters of uniaxial deployment are obtained,and the deployment mechanism based on the Bennett mechanism is designed.Furthermore,the design scheme of the petal frame is proposed with topology optimization methods based on the motion trajectories of adjacent petals.The analysis results show that the design frame can reduce the reflector deformation by 62.5%and enhance the fundamental frequency by four times,which fully proves the effectiveness of the frame design.Using a 10 m aperture SSDA as an example,the deployment mechanism is established,whereas the kinematic and dynamic parameters during the deployment process are analyzed.The deployment mechanism is further derived into a non-overconstrained mechanism by introducing negative kinematic pairs.The results show that the deployment process of SSDA is stable and reliable;the package ratio reaches 0.384.The research methods and conclusions in this study provide technical references for the design of SSDA.
作者
李昊
马小飞
火统龙
李欢笑
吴迪
LI Hao;MA Xiaofei;HUO Tonglong;LI Huanxiao;WU Di(Xi’an Institute of Space Radio Technology,Xi'an 710100,China;School of Mechano-Electronic Engineering,Xidian University,Xi'an 710071,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2023年第22期3305-3317,共13页
Optics and Precision Engineering
基金
国家自然科学基金面上项目资助(No.52175242)。
关键词
固面可展开天线
单自由度折展
背架设计
消极运动副
solid surface deployable antenna
uniaxial deployment
frame design
negative kinematic pair
