• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Optimization of low-thrust spacecraft trajectories by direct shooting methods.
【24h】

Optimization of low-thrust spacecraft trajectories by direct shooting methods.

机译：通过直接射击方法优化低推力航天器的轨迹。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The present study investigates minimum-time and minimum-fuel low-thrust trajectory problems via a single shooting direct method. Various Earth-based and interplanetary case studies have been examined and have yielded good agreement with similar cases in the literature. Furthermore, new near-optimal trajectory problems have been successfully solved. A multiple-orbit thrust parameterization strategy was also developed to solve near-optimal very-low-thrust Earth-based transfers.; The direct approach for trajectory optimization was found to be very robust. For most problems, solutions were obtained even with poor initial guesses for the controls. The direct approach was also found to be only slightly less accurate than the indirect methods found in the literature (within 0.7%).; Lastly, this thesis examines the use of the high-accuracy complex-step derivative approximation method for solving low-thrust transfer problems. For certain very nonlinear transfer problems, the complex-step derivative approximation was found to increase the robustness of the single shooting direct method.
机译：本研究通过单次射击直接方法研究了最小时间和最小燃料的低推力轨迹问题。已经审查了各种基于地球和行星际的案例研究，并与文献中的类似案例取得了很好的一致性。此外，已经成功地解决了新的接近最优的轨迹问题。还开发了一种多轨道推力参数化策略，以解决基于近地极低推力的地基传递。发现用于轨迹优化的直接方法非常可靠。对于大多数问题，即使对控件的初始猜测很差，也可以获得解决方案。还发现直接方法的准确性仅比文献中的间接方法（0.7％以内）低。最后，本文研究了使用高精度复步导数逼近方法来解决低推力传递问题。对于某些非常非线性的转移问题，发现复步导数近似可以提高单次射击直接方法的鲁棒性。

著录项

  • 作者

    Rampersad, Christopher.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Aerospace.
  • 学位 M.A.Sc.
  • 年度 2004
  • 页码 94 p.
  • 总页数 94
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天技术的研究与探索;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号