摘要
大型航天结构多以桁架作为支撑,发射入轨后通过展开机构将桁架展开,以构成结构的最终形式,因此桁架的顺利展开对于保证航天器的正常运行具有重要意义.本文采用多体动力学理论对空间柔性桁架的可动性问题进行了研究,首先给出了桁架的展开动力学模型,然后建立了桁架中铰链的接触动力学模型,其次给出了铰链摩擦力的计算方法,进而提出了一个桁架结构可动性的判据,最后开展了数值仿真.仿真结果显示,较小的铰链间隙、较大的铰链摩擦力、以及较小的展开驱动力会降低桁架结构的展开可动性.
Large-scale aerospace structures are mostly supported by truss.After being launched into orbit,the truss will unfold through deployable mechanisms to form the final structure.Therefore,the smooth deployment of the truss is great significance for ensuring the normal operation of the spacecraft.This paper studies the mobility problem of space flexible truss by using the multibody dynamics theory.Firstly,the deployable dynamic model of the truss is given.Then,the contact dynamic model of joint in truss is established and the calculation method of joint friction force is presented.Subsequently,we propose a criterion for the mobility of the truss structure.Finally,numerical simulations are carried out.The simulation results show that smaller joint clearance,larger joint friction force,and smaller deploy driving force will reduce the deployable mobility of the truss structure.
作者
汪天武
蔡国平
WANG Tianwu;CAI Guoping(Department of Engineering Mechanics,MOE Key Laboratory of Hydrodynamics,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《力学季刊》
北大核心
2025年第2期266-277,共12页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(10172214)
上海航天创新基金(USCAST2023-25)。
关键词
柔性桁架
展开可动性
铰间隙
铰摩擦
flexible truss
deployable mobility
joint clearance
joint friction
