Linear Parameter-Varying Anti-windup Control For Active Microgravity Isolation
| Authors: | Zhang Feng, Department of Mechanical Enigineering, University of Houston, United States
Fialho Ian, Department of Mechanical Enigineering, University of Houston, United States
Grigoriadis Karolos, Department of Mechanical Enigineering, University of Houston, United States |
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| Topic: | 2.3 Non-Linear Control Systems |
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| Session: | Nonlinear Controller Design |
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| Keywords: | Saturation control, Nonlinear control, Time varying system, Parametric variation, Aerospace control |
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Abstract
In this paper a linear parameter-varying (LPV) anti-windup approach is applied to provide anti-windup compensation for adaptive active microgravity vibration isolation. For such systems, anti-windup protection is required because of actuator saturation in response to inertially based forces acting on the isolated platform. For the example presented in the paper, a static anti-windup compensator scheduled based on the measurement of the rack displacement is designed so that it applies a correcting signal only when the control is saturated. The LPV anti-windup scheme is combined with an LPV controller that shifts its focus from a "soft" setting to a "stiff" setting depending on the need for acceleration minimization or relative displacement reduction to prevent bumping. The performance of the overall closed-loop system is demonstrated by simulations.
