中文摘要：

由于非线性,最优控制问题通常依赖于数值求解,即通过离散目标泛函和受控运动方程转化为一有限维的非线性最优化问题.最优控制问题中的受控运动方程在表示为受控Birkhoff方程的形式之后,可以利用受控Birkhoff方程的离散变分差分格式进行离散.与按照传统差分格式近似受控运动方程相比,此途径可以诱导更加真实可靠的非线性最优化问题,进而也会诱导更加精确有效的离散最优控制.应用于航天器交会对接问题,该种数值求解最优控制问题的方法在较大时间步长的情况下仍然求得了一个有效实现交会对接的离散最优控制.模拟结果验证了该方法的有效性.

英文摘要：

In general,optimal control problems rely on numerically rather than analytically solving methods,due to their nonlinearities.The direct method,one of the numerically solving methods,is mainly to transform the optimal control problem into a nonlinear optimization problem with finite dimensions,via discretizing the objective functional and the forced dynamical equations directly.However,in the procedure of the direct method,the classical discretizations of the forced equations will reduce or affect the accuracy of the resulting optimization problem as well as the discrete optimal control.In view of this fact,more accurate and efficient numerical algorithms should be employed to approximate the forced dynamical equations.As verified,the discrete variational difference schemes for forced Birkhoffian systems exhibit excellent numerical behaviors in terms of high accuracy,long-time stability and precise energy prediction.Thus,the forced dynamical equations in optimal control problems,after being represented as forced Birkhoffian equations,can be discretized according to the discrete variational difference schemes for forced Birkhoffian systems.Compared with the method of employing traditional difference schemes to discretize the forced dynamical equations,this way yields faithful nonlinear optimization problems and consequently gives accurate and efficient discrete optimal control.Subsequently,in the paper we are to apply the proposed method of numerically solving optimal control problems to the rendezvous and docking problem of spacecrafts.First,we make a reasonable simplification,i.e.,the rendezvous and docking process of two spacecrafts is reduced to the problem of optimally transferring the chaser spacecraft with a continuously acting force from one circular orbit around the Earth to another one.During this transfer,the goal is to minimize the control effort.Second,the dynamical equations of the chaser spacecraft are represented as the form of the forced Birkhoffian equation.Then in this case,the discrete variation