Abstract: During the separation process of outer cover and spacecraft body,the interaction force will affect the motion state of the spacecraft body.In order to explore the influence of the elastic separation of the outer cover on the spacecraft body.Firstly,based on the theory of multibody dynamics,Euler parameters are used to describe the attitude of rigid body.Then the dynamics equations including constraints of the system are obtained with a method of Lagrange multipliers by considering the interaction during the separation of rigid body.Finally,for the established dynamic model,the generalized α algorithm is used to solve the equation by time integration,and the corresponding calculation results are given for different conditions.The results show that the subsequent rotation state of the separated cabin changes regularly under different initial conditions.

Key words: separation, rotating cabin, rigid body rotation, multibody dynamics, generalized α algorithm, dynamic modeling

摘要： 航天器在外罩分离过程中,外罩与航天器本体之间存在相互作用力,会对航天器本体的运动状态产生影响。为探究外罩弹性分离对航天器本体的的影响规律,基于多体动力学理论使用欧拉参数描述刚体姿态,考虑分离时刚体间的相互作用,引入拉格朗日乘子得到含约束方程的多刚体动力学模型。最后,针对建立的动力学模型,采用广义α算法对方程进行时间积分求解,并针对不同工况给出了相应的计算结果。结果表明,在不同初始条件下分离后舱体后续的旋转状态按一定规律变化。

关键词: 分离, 旋转舱体, 刚体转动, 多体动力学, 广义α算法, 动力学建模