薄壁圆管开口式伸展臂卷绕过程力学特性分析  

Mechanical Feature Analysis of a Deployable Thin-Walled Open Cylindrical Boom

作　　者：王思聪 商红军[2] 郭宏伟[1] 刘荣强[1] 史创[1] WANG Sicong;SHANG Hongjun;GUO Hongwei;LIU Rongqiang;SHI Chuang(School of Mechatronical Engineering,Harbin Institute of Technology,Harbin,150001,China;General Department,China Academy of space technology,Beijing 100094,China)

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001 [2]中国空间技术研究院总体部,北京100094

出　　处：《载人航天》2020年第2期159-165,共7页Manned Spaceflight

基　　金：载人航天预先研究项目(040203)。

摘　　要：针对空间可自展开的薄壁圆管开口式伸展臂在展收过程中的大变形易导致杆件局部应变能、应力过高,从而使杆件撕裂失效的问题,通过建立伸展臂应变能、驱动力矩解析模型,建立卷绕过程有限元模型,得到了伸展臂卷绕过程中应变能、驱动力矩,研究了应变能、驱动力矩对伸展臂尺寸参数变化的敏感度;同时根据第四强度理论分析了伸展臂最大Von Mises等效应力点的位置及其在卷绕过程中的变化规律。结果表明:总应变能、驱动力矩对伸展臂厚度的改变最敏感,对开口角度最不敏感,伸展臂外半径及卷轴外半径对伸展臂的影响曲线存在极值;伸展臂在由自由弯曲向卷绕弯曲过渡及展平端附近易发生失效;伸展臂卷绕过程中最大等效应力点始终位于伸展臂端部,卷绕一周后该点始终位于伸展臂端部横截面中心处,其等效应力值随着卷绕的进行不断增高,该点为伸展臂上最易失效点。Self-deployable thin-walled slit tube booms are widely used in space due to their light-weight and high deploy-fold ratio.However,the booms may be teared and disabled as high deformation can lead to high strain energy or stress during coiling or deploying.An arithmetical model was built to obtain the boom strain energy and driving force,and an FEM model was built to find the maximum Von Mises stress point on the boom.A parametric study was conducted to illustrate the relationships between the parameters and the mechanical properties.The results showed that the strain energy and driving torque were sensitive to the boom thickness,and the change of the boom slit angle had little effect on both energy and torque.The impact from the boom natural radius and the coiled radius was non-linear.The maximum Von Mises stress point on the boom was always located in the end of the boom during boom coiling.After one turn coiling,the maximum stress always appeared in the middle of the boom end,and the value increased with the hub winding.Therefore,this point is the most easily damaged point all over the boom.

关 键 词：薄壁伸展臂 应变能 驱动力矩 等效应力 

分 类 号：V19[航空宇航科学与技术—人机与环境工程] V423