摘要
文章分析了斜拉索倾角对支撑臂剪切刚度和扭转刚度的影响,给出了一定横杆长度下斜拉索倾角的最佳取值范围。以支撑臂杆件不发生屈曲失效和支撑臂在最大负载下不发生坍塌为准则,给出了斜拉索预张力的上下限。基于Hertz接触理论,推导了斜拉索预张力与球铰副接触刚度的关系,将关系式引入支撑臂单元段的有限元模型中,进行了模态分析,给出了斜拉索预张力对单元段一阶弯曲频率的影响曲线。分析结果表明,单元段一阶频率先随着斜拉索预张力的增加而增加,但当预张力超过一定值后,预张力的增加反而会使一阶频率降低;得到了斜拉索预张力优选范围。推导了锁定装置解锁力与支撑臂收拢时所需外力矩的关系,利用ADAMS软件对展开/收拢过程的扭矩进行了仿真,对支撑臂单元段展开/收拢过程中所需力矩进行了试验测试,试验结果表明,力矩的理论计算及仿真与试验结果基本吻合,误差在3%以内,证明了理论计算与仿真的正确性。研究结果为球铰接杆式支撑臂中斜拉索组件设计提供了理论依据。
The influence of the diagonal structural parameter （the angle between the diagonal cable and the batten） on the mast shear stiffness and the torsion stiffness was analyzed. An optimization range of the angle was obtained to determine the batten length. The minimum and maximum value of preloads of diagonal cables were obtained based on the rules that the loads on rods would be less than the allowable buckling stress and the mast wouldn＇t collapse on orbit. The relationship between the preloads of diagonal cables and contact stiffness of spherical joint was obtained by the Hertz contact theory and the Winkler beam base hypothesis. Afterward, considering the relationship, the modal analysis was carried out with a finite element model of a mast bay. The analysis results show that the fundamental frequency would increase as the preload increases first, and then the frequency would decrease. Also, the optimization range of preloads in test model is between 500 to 700 N. The relationship between the maximum torsion during deploying/retracting and latch/unlatch force was obtained by static analysis and ADAMS simulation, the results of static analysis and ADAMS simulation is consistent. Then the maximum torsion test during deploying/retracting was carried out. By comparing with the test data, the error of the static analysis results and the ADAMS simulation one is less than 3 %.
出处
《中国空间科学技术》
EI
CSCD
北大核心
2015年第2期33-40,共8页
Chinese Space Science and Technology
关键词
球铰接杆式支撑臂
斜拉索
预张力
锁定力
解锁力
ADAM-type articulated mast
Diagonal cable
Preload
Latch force
Unlatch force
