具有变泊松运动特性的剪叉式折展机构运动学分析  

Kinematics analysis of scissor deployable mechanism with variable Poisson motion characteristics

作　　者：畅博彦[1,2] 闫圣杰 梁栋 关鑫[1] 韩芳孝 CHANG Boyan;YAN Shengjie;LIANG Dong;GUAN Xin;HAN Fangxiao(School of Mechanical Engineering,Tiangong University,Tianjin 300387,China;Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology,Tianjin 300387,China)

机构地区：[1]天津工业大学机械工程学院,天津300387 [2]天津市现代机电装备技术重点实验室,天津300387

出　　处：《工程设计学报》2024年第1期20-30,共11页Chinese Journal of Engineering Design

基　　金：国家自然科学基金资助项目(52005368,52175243);天津市高等学校创新团队培养计划资助项目(TD13-5037)。

摘　　要：为提高折展机构的折展率和支撑性能,提出了一种具有变泊松运动特性的剪叉式折展机构并对其进行运动学分析。首先,提出了一种单闭环厚板支撑单元并将其应用于三明治结构,利用ANSYS Workbench软件分析不同形状夹芯层对三明治结构支撑刚度的影响,发现采用厚板支撑单元的三明治结构具有更好的支撑效果和更小的质量,且可通过改变结构设计参数来实现正负泊松比的切换。然后,根据泊松比的定义,设计了一种具有变泊松运动特性的正n边形剪叉式折展机构;基于螺旋理论,通过绘制闭环折展机构的旋量约束拓扑图分析得到其自由度为1,将折展机构分为3种模块并阐述了模块化纵向扩展的原理和过程。最后,建立了m层正n边形剪叉式折展机构的运动学模型并搭建了正四边形剪叉式折展支撑结构实物样机,进一步验证了机构的变泊松运动特性,这可为后续的研究提供理论基础。In order to improve the folding rate and support performance of deployable mechanisms,a scissor deployable mechanism with variable Poisson motion characteristics is proposed and its kinematics analysis is conducted.Firstly,a thick panel support unit with single-closed-loop was proposed and applied to sandwich structures.Through analyzing the influence of different shape sandwich layers on the support stiffness of sandwich structure by using ANSYS Workbench software,it was found that the sandwich structure with thick plate support unit had better support effect and smaller mass,and the positive and negative Poissonratio could be switched by changing the structural design parameters.Secondly,according to the definition of Poissonratio,a regular n-sided scissor deployable mechanism with variable Poisson motion characteristics was designed.Based on the screw theory,the screw constraint topology graph of the closed-loop deployable mechanism was drawn to analyze its degree of freedom as 1.The deployable mechanism was divided into three modules,and the principle and process of modular longitudinal expansion were described.Finally,the kinematics model of the m-layer regular n-sided scissor deployable mechanism was established and the prototype of the regular quadrilateral scissor deployable support structure was set up to further verify the variable Poisson motion characteristics of the mechanism,which could provide a theoretical basis for the follw-up research.

关 键 词：三明治结构 剪叉式折展机构 螺旋理论 运动学分析 

分 类 号：TH112[机械工程—机械设计及理论]