Multiple-Subarc Gradient-Restoration Algorithm, Part 2: Application to a Multistage Launch Vehicle Design View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2003-01

AUTHORS

A. Miele, T. Wang

ABSTRACT

In Part 1 (see Ref. 2), a multiple-subarc gradient-restoration algorithm (MSGRA) was developed with the intent of enhancing the robustness of gradient-restoration algorithms and also enlarging the field of applications. Indeed, MSGRA can be applied to optimal control problems involving multiple subsystems as well as discontinuities in the state and control variables at the interface between contiguous subsystems.In Part 2 (this paper), MSGRA is applied to compute the optimal trajectory for a multistage launch vehicle design, specifically, a rocket-powered spacecraft ascending from the Earth surface to a low Earth orbit (LEO). Single-stage, double-stage, and triple-stage configurations are considered. For multistage configurations, discontinuities in the mass occur at the interfaces between consecutive stages.The numerical results show that, given the current levels of the engine specific impulse and spacecraft structural factor, the single-stage version is not feasible at this time, while the double-stage and triple-stage versions are feasible. Further increases in the specific impulse and decreases in the structural factor are needed if the single-stage configuration has to become feasible.Also, the numerical results show that the optimal trajectory requires initially maximum thrust, followed by modulated thrust so as to satisfy the maximum acceleration constraint, followed by nearly zero thrust for coasting flight, followed by a final burst with moderate thrust so as to increase the spacecraft velocity to the circular velocity needed for LEO insertion. The above properties of the optimal thrust time history are useful for developing the guidance scheme approximating in real time the optimal trajectory for a launch vehicle design. More... »

PAGES

19-39

References to SciGraph publications

  • 2003-01. Multiple-Subarc Gradient-Restoration Algorithm, Part 1: Algorithm Structure in JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS
  • 1998-06. Optimal Ascent Trajectories and Feasibility of Next-Generation Orbital Spacecraft in JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1023/a:1022154001343

    DOI

    http://dx.doi.org/10.1023/a:1022154001343

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1020008711


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