摘要
针对可折叠薄膜航天器的特点和设计需求,设计一种由杆件、弦绳、薄膜构成的新型可折叠/展开的刚柔耦合多体系统:可折叠张拉整体-薄膜系统。杆件可以提供充足的系统刚度,通过控制弦绳拉力可实现系统形态变化和形态控制,薄膜折叠技术可明显减小系统折叠形态的外形尺寸。采用非线性有限元方法建立系统动力学模型,用于描述系统运动中的几何非线性特性和薄膜折叠/展开过程中的材料非线性特性。基于准静态控制和H;控制方法设计一种系统形态展开组合控制策略,仿真结果表明该控制策略可以在系统预应力构型发生切换的情况下实现系统形态展开,并且在展开形态下快速稳定系统并抑制系统振动。
A foldable tensegrity-membrane system is designed and studied.This novel flexible multibody system,composed of bars,tendons,and membranes,is capable of system folding and deployment.Bars provide sufficient system stiffness,and tendon force control technique can be used to achieve system shape control.Membrane folding techniques can reduce folded system shapes.A nonlinear finite element model is developed to study system dynamics,and geometric and material nonlinearities are considered in the model.A combined control strategy based on quasi-static control and H;control is designed to achieve system deployment.Simulation results indicate that the proposed control strategy is capable of controlling system dynamics when system prestressing configuration transitions occur during system deployment and the system can be rapidly stabilized to alleviate system vibrations at the final deployed shape.
作者
杨庶
YANG Shu(School of Automation,Northwestern Polytechnical University,Xi’an 710072,China)
出处
《南京航空航天大学学报》
CAS
CSCD
北大核心
2021年第S01期122-129,共8页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(51808447)资助项目
