摘要
针对可展开式减速器的辐条在复杂气动载荷下易发生弯曲变形的问题,提出一种具有刚度自适应性可展开伞状减速装置,通过合理布置预张紧柔索使辐条的抗弯刚度随外界气动载荷的增大而增强。首先,基于载荷方程建立减速装置支撑结构的理论模型,分析刚度自适应性的作用原理,其次,利用有限元分析软件创建无索与含索减速装置的对照模型,验证含索减速装置的刚度自适应性。最后,建立运动微分方程与虚拟样机模型,分析减速装置展开过程。分析结果表明,在直径10 mm,初始应力10 MPa的预张紧柔索作用下,辐条最大挠度随载荷的变化曲线变为单调递增的平滑凹曲线,曲率随预张紧柔索初始应力的增大逐渐减小;含索减速装置整体的最大变形在0~60%极限载荷区间低速稳定增长,最大挠度减小超过50%,展现出较理想的刚度自适应性。
Aiming at the problem that the ribs of the expandable decelerator are prone to bending and deformation under complex aerodynamic load,a deployable umbrella-shaped decelerator with stiffness adaptability is proposed,and the bending stiffness of the ribs is enhanced with the increase of external aerodynamic load by reasonably arranging the pretensioned flexible cable.Firstly,based on the load equation,the theoretical model of the support structure of the decelerator is established,and the principle of stiffness adaptability is analyzed.Secondly,the finite element analysis software is used to create a control model of cable-free and cable-containing decelerators to verify the stiffness adaptability of the cable-containing decelerator.Finally,the differential equation of motion and virtual prototype model is established to analyze the unfolding process of the decelerator.The analysis results show that under the action of the pretensioned flexible cable with a diameter of 10mm and an initial stress of 10MPa,the maximum deflection of the rib changes with the load curve into a monotonically increasing smooth concave curve,and the curvature gradually decreases with the increase of the initial stress of the pretensioned flexible cable.The maximum deformation of the whole cable-containing decelerator increases steadily at low speed in the 0~60%ultimate load range,and the maximum deflection decreases by more than 50%,showing relatively ideal stiffness adaptability.
作者
耿坤
张静
郭宏伟
刘荣强
寇子明
GENG Kun;ZHANG Jing;GUO Hongwei;LIU Rongqiang;KOU Ziming(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Province Engineering Technology Research Center for Mine Fluid Control,Taiyuan 030024,China;National-local Joint Engineering Laboratory of Mining Fluid Control,Taiyuan 030024,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;Hebei Innovation Center for Equipment Light weight Design and Manufacturing,Qinhuangdao 066004,China;School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《真空科学与技术学报》
CAS
CSCD
北大核心
2023年第12期1021-1032,共12页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金重点项目(51835002)
山西省科技创新领军人才团队项目(202204051002003)。
关键词
伞状减速装置
预张紧柔索
刚度自适应
静力学分析
动力学分析
Umbrella decelerator
Pre-tensioning cable
Stiffness self-adaptation
Static analysis
Dynamic analysis
作者简介
联系人:张静,E-mail:free1985216@163.com。
