A HYBRID OPTIMAL CONTROL METHOD FOR TIME-OPTIMAL SLEWING MANEUVERS OF FLEXIBLE SPACECRAFT Conference Paper

abstract

• 2018 Univelt Inc. All rights reserved. The problem of time-optimal, rest-to-rest slewing of a flexible spacecraft through a large angle is studied. These maneuvers are known to have bang-bang control profiles, which lead to undesirable excitation of higher frequency vibrations. It is common to approximate the dynamics using the assumed modes method; and formulate and solve the resulting optimal control problem using both direct and indirect methods. In order to improve solution convergence and attenuate the effects of undesired vibrations, torque smoothing is applied through a novel hyperbolic tangent smoothing. Application of control smoothing is demonstrated within the indirect formulation. Results of the two approaches are compared along with discussions on the advantages of smoothing, truncation of the discretized model and development of a hybrid optimal control method.

authors

• Junkins, John

published proceedings

• ASTRODYNAMICS 2018, PTS I-IV

author list (cited authors)

• Singh, S. K., Taheri, E., & Junkins, J. L.

complete list of authors

• Singh, Sandeep K||Taheri, Ehsan||Junkins, John L

publication date

• January 2019

published in

• Spaceflight Mechanics 2005, Vol 120, Pts 1 and 2  Journal

International Standard Book Number (ISBN) 13

• 978-0-87703-657-9

start page

• 2659

end page

• 2678

volume

• 167