标题： 多重引力辅助轨迹的初步设计 显示英文标题

标题： On the Preliminary Design of Multiple Gravity-Assist Trajectories

摘要： 在本文中，多重引力辅助轨迹的初步设计被表述为一个全局优化问题。 对解空间结构的分析揭示出强烈的多模态性，这严格依赖于模型的复杂性。 另一方面，展示了过度简化可能会阻碍找到潜在有趣解的可能性。 然后提出了一种轨迹模型，该模型在模型完整性和优化问题复杂性之间取得平衡。 通过一种新颖的全局搜索方法对所得解空间进行探索，该方法结合了基于进化的算法和系统分支策略。 这种方法通过自动平衡局部收敛和全局搜索，实现了对复杂解域的有效探索。 一些困难的多重引力辅助轨迹设计案例证明了所提出方法的有效性。 显示英文摘要

摘要： In this paper the preliminary design of multiple gravity-assist trajectories is formulated as a global optimization problem. An analysis of the structure of the solution space reveals a strong multimodality, which is strictly dependent on the complexity of the model. On the other hand it is shown how an oversimplification could prevent finding potentially interesting solutions. A trajectory model, which represents a compromise between model completeness and optimization problem complexity is then presented. The exploration of the resulting solution space is performed through a novel global search approach, which hybridizes an evolutionary based algorithm with a systematic branching strategy. This approach allows an efficient exploration of complex solution domains by automatically balancing local convergence and global search. A number of difficult multiple gravity-assist trajectory design cases demonstrates the effectiveness of the proposed methodology.