摘要
设计了一种新型索杆桁架式可展开单元,可以实现大型空间可展开机构的高刚度与轻量化。新型可展单元截面由三个正三角形组成,三角形的三个边由索代替,利用中心三叉结构进行索的牵引与张紧。使用被压缩的扭簧作为展开过程中的驱动元件,通过双曲柄滑块机构实现每个基本可展单元沿轴向的同步运动,采用双向折叠展开的设计大幅减小机构折叠后的体积,采取索杆结合的方式减小机构整体的质量。在杆件连接节点处布置自锁铰链,在完全展开时将机构被锁定为稳定状态。ADAMS软件的动力仿真结果验证了机构展开过程的可行性,扭簧的刚度越大,展开的初始角速度越大,展开时间越短。机构展开后的静刚度分析表明,通过沿机构轴向布置对角拉索,且当对角拉索处于预紧状态时,可展机构可以获得更高的结构刚度。机构的模态分析表明,相比无对角拉索机构,含对角拉索的可展机构振动频率有所提高。
A new cable-rod truss-type deployable unit is designed to achieve high rigidity and light weight of the large-space deployable mechanism.The section of the new deployable unit is composed of three regular triangles whose three sides of the triangle are replaced by cables.The central trident structure is used for traction and tension of the cables.The compressed torsion spring is used as the driving element during the unfolding process,and the synchronous movement of each basic deployable unit along the axial direction is realized through the double crank-slider mechanism.The design of two-way folding-unfolding greatly reduces the volume of the mechanism after folding,the style of combination of cables and rods reduces the overall mass of the mechanism.Self-locking hinges are arranged at the connecting nodes of the rods to lock the mechanism into a stable state when fully deployed.The dynamic simulation results of ADAMS software verify the feasibility of the mechanism deployment process.The greater the stiffness of the torsion spring,the greater the initial angular velocity of deployment and the shorter the deployment time.The static stiffness analysis of the mechanism after deployment shows that by arranging the diagonal cables along the axis of the mechanism,and when the diagonal cables are in a preloaded state,the deployable mechanism can obtain higher structural stiffness.The modal analysis of the mechanism shows that,compared with the mechanism without diagonal cables,the vibration frequency of the expandable mechanism with diagonal cables is increased.
作者
申理精
耿坤
李盘浩
张静
SHEN Lijing;GENG Kun;LI Panhao;ZHANG Jing(College of Applied Sciences,Taiyuan University of Science and Technology,Taiyuan 030024;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024;Shanxi Province Engineering Technology Research Center for Mine Fluid Control,Taiyuan 030024;National-local Joint Engineering Laboratory of Mining Fluid Control,Taiyuan 030024)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2022年第17期135-143,共9页
Journal of Mechanical Engineering
基金
国家自然科学基金重点(51835002)
山西省应用基础研究计划面上青年基金(201901D211010)
山西省高等学校科技创新(2019L0177)
山西省科技厅青年基金(201901D211285)资助项目。
关键词
轻型可展机构
静力学分析
结构刚度
运动学分析
light deployable mechanism
static analysis
structural rigidity
kinematics analysis
