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X33 Reusable Launch Vehicle Control on Sliding Modes: Concepts for a Control System DevelopmentControl of the X33 reusable launch vehicle is considered. The launch control problem consists of automatic tracking of the launch trajectory which is assumed to be optimally precalculated. It requires development of a reliable, robust control algorithm that can automatically adjust to some changes in mission specifications (mass of payload, target orbit) and the operating environment (atmospheric perturbations, interconnection perturbations from the other subsystems of the vehicle, thrust deficiencies, failure scenarios). One of the effective control strategies successfully applied in nonlinear systems is the Sliding Mode Control. The main advantage of the Sliding Mode Control is that the system's state response in the sliding surface remains insensitive to certain parameter variations, nonlinearities and disturbances. Employing the time scaling concept, a new two (three)-loop structure of the control system for the X33 launch vehicle was developed. Smoothed sliding mode controllers were designed to robustly enforce the given closed-loop dynamics. Simulations of the 3-DOF model of the X33 launch vehicle with the table-look-up models for Euler angle reference profiles and disturbance torque profiles showed a very accurate, robust tracking performance.
Document ID
19990010044
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Shtessel, Yuri B.
(Alabama Univ. Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
September 1, 1998
Subject Category
Launch Vehicles And Space Vehicles
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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