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This paper investigates the attitude control problem in the presence of wheel low-speed friction and external disturbances. The critical issues surrounding wheel friction are firstly discussed, and the spacecraft attitude model and wheel friction model are introduced. A friction observer that can effectively estimate the friction torque is developed. An observer-based sliding mode controller, to perform...
A new framework based on structured singular value (μ) analysis is introduced to evaluate the robust stability margin of an SISO aeroservoelastic system with the structural and actuator uncertainties considered. The essential of the proposed method is to extend the nominal gain margin concept based on open-loop analysis to robust stability margin by introducing an extra uncertainty. This newly developed...
To improve the dynamic response of the parallel AC/DC transmission system, constructive nonlinear control designation has been introduced into the typical nonlinear system. In according to the diversity of nonlinear phenomena, lots of nonlinear controls are proposed. The constructive nonlinear control using the dissipativity and passivity concept can guarantee the stability and robustness of the system...
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