Publication:
Minimum vibration maneuvers using input shaping and pulse-width, pulse frequency modulated thruster control

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Authors
Buck, Nicholas V.
Subjects
Advisors
Agrawal, B.N.
Date of Issue
1996-12
Date
December, 1996
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Minimizing the modal vibration induced by on-off thrusters is a challenging problem designers of flexible spacecraft. This thesis presents the first study of Pulse Width, Pulse Frequency (PWPF) modulated thruster control using the method of command input shaping. Input shaping systems with linear actuators has been successfully developed to reduce modal vibrations. Recently this method has been extended to systems with on-off actuators to some degree. However, exist approaches require complicated nonlinear optimization and result in bang-bang control action. Bang thruster operation on flexible spacecraft is propellant-intensive and causes frequent thru switches. In this thesis, a new approach integrating command input shaping with PWPF-modulated thruster control is developed to minimize residual vibration in maneuvers and to reduce propel consumption. To realize this approach, an in-depth analysis of the PWPF modulator is first conducted to recommend parameter settings. Next, command input shapers are designed and integrated with PWPF modulator. Simulation verifies the efficacy of this technique in reducing modal vibration. Lastly, robustness analyses are performed and demonstrate the method's insensitivity to frequency damping uncertainty.
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Thesis
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Format
x, 151 p.
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Distribution Statement
Approved for public release; distribution is unlimited.
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