考虑铰摩擦的柔性太阳阵展开动力学研究
DEPLOYMENT DYNAMICS OF FLEXIBLE SOLAR ARRAYS CONSIDERING FRICTIONAL JOINT
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摘要: 研究了空间漂浮航天器太阳阵展开与锁定过程的刚柔耦合动力学问题. 基于Jourdain 速度变分原理和单项递推组集方法, 建立了太阳阵展开与锁定过程的刚柔耦合多体系统动力学模型,采用虚功率原理推导了铰摩擦对系统动力学方程的贡献. 在以上动力学模型中引入3-D 鬃毛摩擦模型来研究铰链的摩擦特性对太阳阵展开动力学的影响. 所建动力学模型的正确性通过与商业软件ADAMS 和NASTRAN 的联合仿真对比得到了验证,该模型能够有效地预测太阳阵的展开历程以及航天器姿态的动态行为.Abstract: The deployment and locking of solar arrays of a free-floating spacecraft is studied in this paper. The rigid-flexible coupling dynamic model for describing the deployment and locking process is established using the Jourdain's velocity variational principle and the approach of forward recursive formulation. The contribution of joint friction to the dynamic equation of the system is derived based on the virtual power principle. The 3-D bristle friction model is introduced to study the influence of joint friction on the deployment dynamics of solar arrays. The validity of the proposed model is verified through the comparison of simulation results with those using the commercial software ADAMS and NASTRAN, and this model is available for predicting the deployment process of solar arrays and the attitude motion of spacecraft.