CAJ | 학술논문

探月飞船升阻比较低，再入时为达到长的飞行纵程，必须采用跳跃式再入方式。考虑多种约束条件，对跳跃式再入走廊进行了优化设计。首先，对路径约束进行分析，根据跳跃式再入轨迹的动力学特性对轨迹进行分段，推导了关键段中路径约束间的解析关系式，并在此基础上对优化问题进行了简化；其次，对滚转角速度约束进行分析，通过选择合理的离散点个数来保证角速度约束的满足；最后，为保证结果的高精度与全局最优性，采用两层优化策略进行求解，先利用高斯伪谱法得到控制变量初值，再将初值代入直接打靶法中计算得到最终结果。仿真结果表明：路径约束分析结果与优化结果保持一致，可在一定程度上简化优化问题；对滚转角速度约束的处理简单有效；两层优化策略能使问题快速收敛到满足约束的高精度解。
탐월비선승조비교저，재입시위체도장적비행종정，필수채용도약식재입방식。고필다충약속조건，대도약식재입주랑진행료우화설계。수선，대로경약속진행분석，근거도약식재입궤적적동역학특성대궤적진행분단，추도료관건단중로경약속간적해석관계식，병재차기출상대우화문제진행료간화；기차，대곤전각속도약속진행분석，통과선택합리적리산점개수래보증각속도약속적만족；최후，위보증결과적고정도여전국최우성，채용량층우화책략진행구해，선이용고사위보법득도공제변량초치，재장초치대입직접타파법중계산득도최종결과。방진결과표명：로경약속분석결과여우화결과보지일치，가재일정정도상간화우화문제；대곤전각속도약속적처리간단유효；량층우화책략능사문제쾌속수렴도만족약속적고정도해。
For lunar module with low lift-to-drag ratio , skip entry trajectory must be flown to achieve long downrange.In this paper, skip entry corridor was designed considering multi-constraints. First, path constraints were analyzed , analytic relations among them were formulated based on the dynamic feature of skip entry trajectory .Simplification could be made to the original problem .Sec-ond , bank rate and bank acceleration constraints were analyzed .Bank rate constraint could be satis-fied when the number of discrete points was choosing reasonably .Third, considering both the global optimality and high-accuracy of solution , a two-level optimization strategy was proposed .Initial guess of controlled variable was obtained using Gauss pseudospectral method , then the optimal re-sults was obtained using direct shooting .The results indicate that numerical optimization results are in good accordance with the theoretical results of path constraints analysis , the bank constraints en-forcement method proposed in this paper is valid and easy to implement , and the proposed optimiza-tion strategy can obtain high-accuracy optimal solutions which satisfy all the constraints .