Abstract
This paper investigates a fuzzy disturbance observer (FDO)-based terminal sliding mode control (TSMC) strategy for the liquid-filled spacecraft with flexible structure(LFS-FS) under control saturation. Firstly, a novel FDO is designed to estimate the lumped uncertainty, including the inertia uncertainty, external disturbance, the coupling of liquid slosh and flexible structure(LF), as well as the parts that exceed control saturation. The merits of the FDO lie in that estimation error can be arbitrarily small by adjusting the designed parameters and the prior information is not required. Then, based on the estimation of FDO, a finite-time TSMC is designed, which has more satisfactory control performance, such as chattering reduction and fast convergence speed. The stability of the closed-loop system is proved strictly by Lyapunov theory. Finally, numerical simulations are presented to demonstrate the effectiveness of the proposed method.
Highlights
IntroductionOver the past few decades, the space technology development is recognized as an important part for national security, earth observation, planetary exploration and so on
Over the past few decades, the space technology development is recognized as an important part for national security, earth observation, planetary exploration and so on. Since it has been rapidly developed for the control strategy of rigid spacecraft, many methods have been introduced to enhance the stability of the control effect, such as sliding mode control(SMC) [1]–[4], adaptive control [5], [6], robust control [7]–[9]
The missions of the spacecraft are becoming increasingly complex, flexible appendages [10] and liquid storage chamber [11] are widely adopted on the spacecraft, which change the control mode and make the control more difficult
Summary
Over the past few decades, the space technology development is recognized as an important part for national security, earth observation, planetary exploration and so on. Since it has been rapidly developed for the control strategy of rigid spacecraft, many methods have been introduced to enhance the stability of the control effect, such as sliding mode control(SMC) [1]–[4], adaptive control [5], [6], robust control [7]–[9]. The missions of the spacecraft are becoming increasingly complex, flexible appendages [10] and liquid storage chamber [11] are widely adopted on the spacecraft, which change the control mode and make the control more difficult. Because the space task becomes more complex, longer
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