【摘要】 大型空间电站在轨展开过程中存在典型的滑移约束问题，为精准分析其展开动力学特性，将单个展开胞元视为柔性多体系统，采用绝对节点坐标法（ANCF）构建胞元展开动力学模型，同时引入应变分解法，有效降低全参数单元闭锁带来的建模误差。针对滑移铰的动力学建模需求，提出基于拉格朗日乘子法的无摩擦滑移铰建模方法，推导环形截面梁在ANCF框架下的积分表达式，并通过增加滑移单元法向约束使扰动力趋于零，大幅降低单元滑移过程中的震荡影响。将该建模方法应用于存在大变形的胞元展开系统动力学仿真，结果表明，该方法可精准描述滑移铰的动力学行为，建模精度与仿真稳定性表现良好，可推广应用于各类包含大转动、大变形特征的柔性多体系统动力学分析问题中。更多还原

【Abstract】 Typical sliding constraint problems exist in the on-orbit deployment of large-scale space power stations. To accurately analyze the deployment dynamic characteristics, a single deployment cell is regarded as a flexible multibody system, and the absolute nodal coordinate formulation(ANCF) is adopted to construct its deployment dynamic model. Meanwhile, the strain split method is introduced to effectively reduce the modeling errors caused by full-parameter element locking. A frictionless sliding joint modeling method based on the Lagrange multiplier method is proposed to meet the dynamic modeling requirements of sliding joints. The integral expression of the annular cross-section beam under the ANCF framework is derived, and the disturbance force is driven to zero by adding normal constraints to the sliding element, which greatly weakens the oscillatory effects during the element sliding process. The modeling method is applied to the dynamic simulation of a cell deployment system with large deformations. Results show that the method can accurately characterize the dynamic behavior of sliding joints with good modeling accuracy and simulation stability, and can be extended to the dynamic analysis of various flexible multibody systems with large rotation and large deformation characteristics.更多还原