大型网架式可展开空间结构展开过程索网非光滑摩擦接触缠绕动力学研究

During the on-orbit deployment of large deployable space structures composed of trusses and meshes under microgravity, the flexible meshes and tension networks composed of flexible cables will contact and wrap with friction among them. These non-smooth events will increase the vibration of meshes after the deployment of these structures, or even will lead to failure of the on-orbit deployment. The contact problems of cables have attracted wide attention both at home and abroad. Due to the physical nonlinearity and the geometrical complexity of contact areas and due to the high complexity of contact, self-contact or even wrap problems among large number of flexible cables, however, the study on the deployment of these structures, considering frictional contact and wrap problems of mesh, is still at the initial stage. It is urgent to put forward a new theory or method to solve these problems. In the framework of rigid-flexible multibody system dynamics, this project focuses on the research of non-smooth contact and wrap dynamics with friction for mesh of these large deployable space structures during their deployments. The specific research contents are shown as follows. The rigid-flexible system dynamic model of deployable space structures composed of trusses and meshes will be established, in which the precise modeling of large number of flexible cables in these structures will be a serious consideration. The efficient detection strategy and the non-smooth dynamic modeling of frictional contacts and wraps of meshes will be studied. The deployment of mesh of these structures will be simulated and the influence of frictional contact and wrap of mesh on the process of deployment of these structures will be mainly studied. The vibration of networks after deployment caused by frictional contact and wrap of mesh during the deployment of mesh also will be simulated and the influence of this vibration on the running accuracy during service of these structures will be analysed quantitatively. The research will help to improve the theoretical system of deployment dynamics of large deployable space structures composed of trusses and meshes and will provide theoretical support for the design of these space structures.

大型网架式空间结构在轨展开的过程中，柔性索网和张力网会发生复杂的摩擦接触缠绕等非光滑事件，不仅会加剧该结构展开锁定后的网面振动，甚至会导致结构在轨展开失败。因此绳索的接触问题引起国内外广泛关注。然而，由于接触部位的物理非线性和几何复杂性，特别是大量柔索的接触、自接触甚至缠绕问题极为复杂，考虑索网摩擦接触缠绕的该结构展开研究尚处于起步阶段，急需提出新的理论和方法。本课题拟在刚柔耦合多体系统框架下开展该结构展开过程索网非光滑摩擦接触缠绕动力学的研究，主要内容包括：网架式空间结构刚柔耦合系统动力学建模，重点研究该结构中大量柔索精确模型的建立；索网的高效接触检测方法与非光滑动力学建模研究；索网展开过程仿真，重点研究索网摩擦接触缠绕对展开过程的影响；索网摩擦接触缠绕引起的网面振动对展开锁定后运行精度的影响。本课题有助于完善网架式可展空间结构的展开动力学理论体系，为此类空间结构的设计提供理论支撑。

大型网架式空间结构在轨展开的过程中，柔性索网和张力网会发生复杂的摩擦接触缠绕等非光滑事件，不仅会加剧该结构展开锁定后的网面振动，甚至会导致结构在轨展开失败。因此绳索的接触问题引起国内外广泛关注。然而，由于接触部位的物理非线性和几何复杂性，特别是大量柔索的接触、自接触甚至缠绕问题极为复杂，考虑索网摩擦接触缠绕的该结构展开研究尚处于起步阶段，急需提出新的理论和方法。本课题在刚柔耦合多体系统框架下开展了该结构展开过程索网非光滑摩擦接触缠绕动力学的研究，主要内容包括：网架式空间结构刚柔耦合系统动力学建模，重点研究了该结构中大量柔索精确模型的建立；索网的高效接触检测方法与非光滑动力学建模研究；索网展开过程仿真。重点研究了索网摩擦接触缠绕对展开过程的影响，深入探讨了引起桁架展开不同步现象的原因。本课题有助于完善网架式可展空间结构的展开动力学理论体系，为此类空间结构的设计提供理论支撑。