空间展开机构模型动力学实验与计算

为了研究空间展开机构的展开过程、锁定碰撞及其振动响应,对由1个中心刚体、2个铰链接的柔性梁构成的展开系统模型进行了研究,用有限段梁单元以及碰撞连续力模型的方法建立多体模型,使用自己开发的多体动力学软件对系统展开过程仿真。设计了实验方案和测量方法,构建了展开系统物理模型,研制了面阵CCD光学测量系统,在4m×1.7m气浮平台上对展开过程进行了测量。对非对称展开的数学仿真和实验结果进行了频谱分析和对比,并用特征系统实现算法识别出系统锁定后振动的模态参数,为振动控制提供了必要的信息。

Dynamic experimental study and sim ulation of a flexible deployment system

This paper focuses on the deployment, locking impact, and dynamic response of a flexible deployment system with a central rigid body and two articulated flexible beams. The system was modeled with the finite segments connected by massless beam elements and a continuous contact force model of the locking joint. The governing differential-algebraic equations for the system developed using the Newton-Euler method with Lagrange multipliers were solved using the method of generalized coordinate partitioning. An experimental model of the flexible system was constructed on an air floating platform. A CCD optical measuring system was used to measure the large displacements and vibrations. The system modal parameters obtained using the eigensystem realization algorithm were compared with the simulation, and the results are positive.