Active Microgravity Isolation using Linear Parameter-varying Techniques

F. Zhang, I.J. Fialho, and K.M. Grigoriadis (USA)

Keywords

nonlinear systems, parameterdependent sys tems, uR control, vibration isolation, aerospace systems.

Abstract

This work considers the use of linear parameter-varying (LPV) methods for the control of stiffness hysteresis in ac tive microgravity vibration isolation systems. We assume that the hysteresis model is known, and describe it using a stiffness parameter that takes values in a compact convex set. The proposed parameter-dependent controller is con tinuously scheduled on real-time measurements of the pa rameter, and provides guaranteed stability and performance for the full range of parameter variability. The method is applied to a simplied model of a microgravity vibration isolation system with an umbilical stiffness hysteresis non linearity. Simulations show that the parameter-varying de sign is stable and that the desired robust isolation perfor mance is achieved over the range of displacements consid ered. The results are compared to those obtained with a xed uR controller.

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