Six-degree-of-freedom trajectory optimization utilizing a two-timescale collocation architecture

Prasun N. Desai, Bruce A. Conway

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Six-degree-of-freedom (6DOF) trajectory optimization of a reentry vehicle is solved using a two-timescale collocation methodology. This class of 6DOF trajectory problems are characterized by two distinct timescales in their governing equations, where a subset of the states have high-frequency dynamics (the rotational equations of motion) while the remaining states (the translational equations of motion) vary comparatively slowly. With conventional collocation methods, the 6DOF problem size becomes extraordinarily large and difficult to solve. Utilizing the two-timescale collocation architecture, the problem size is reduced significantly. The converged solution shows a realistic landing profile and captures the appropriate high-frequency rotational dynamics. A large reduction in the overall problem size (by 55%) is attained with the two-timescale architecture as compared to the conventional single-timescale collocation method. Consequently, optimum 6DOF trajectory problems can now be solved efficiently using collocation, which was not previously possible for a system with two distinct timescales in the governing states.

Original languageEnglish (US)
Title of host publicationAstrodynamics 2005 - Advances in the Astronautical Sciences - Proceedings of the AAS/AIAA Astrodynamics Conference
Pages1949-1964
Number of pages16
StatePublished - Oct 9 2006
EventAstrodynamics 2005 - Advances in the Astronautical Sciences - Proceedings of the AAS/AIAA Astrodynamics Conference - South Lake Tahoe, CA, United States
Duration: Aug 7 2005Aug 11 2005

Publication series

NameAdvances in the Astronautical Sciences
Volume123 III
ISSN (Print)0065-3438

Other

OtherAstrodynamics 2005 - Advances in the Astronautical Sciences - Proceedings of the AAS/AIAA Astrodynamics Conference
CountryUnited States
CitySouth Lake Tahoe, CA
Period8/7/058/11/05

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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