Practical fractional-order nonsingular terminal sliding mode control of spacecraft. (September 2022)

• Record Type: Journal Article
• Authors: Alipour, Milad; Malekzadeh, Maryam; Ariaei, Alireza
• Is Part Of: ISA transactions. Volume 128(2022)Part A
• Page Start: 162
• Page End: 173
• Publication Date: 2022-09
• Subjects: Adaptive fractional-order nonsingular terminal sliding mode (AFONTSM) -- Spacecraft attitude control simulator -- Reaction wheels momentum management -- Fixed-time stability; Engineering instruments -- Periodicals; Engineering instruments; Periodicals; Electronic journals; 629.805
• DOI: 10.1016/j.isatra.2021.10.022
• Languages: English
• ISSNs: 0019-0578

Abstract

Abstract: In this study, a new adaptive fractional-order nonsingular terminal sliding mode (AFONTSM) controller is presented. A novel multi-purpose sliding surface is constructed, with the aim of bringing the reaction wheels in to rest after every attitude stabilization maneuver, utilizing the fractional-order difference of the quaternion error and the reaction wheels angular momentum error. The closed-loop system's practical fixed-time stability is investigated using the Lyapunov theorem under uncertainty and external disturbance. The AFONTSM controller's performance is compared with the existing nonsingular terminal sliding mode (NTSM), full-order NTSM, and fractional-order sliding mode controllers. Finally, the proposed AFONTSM controller's effectiveness is studied in close-to-reality situations through practical experiments on the spacecraft attitude control subsystem simulator under internal/external disturbance and uncertainty; then, the results are compared with previous studies. Highlights: Fractional calculus grants more degrees of freedom to integer-order controllers. Reaction wheels have restrictions on their torque and angular momentum. Attitude stabilization and momentum management are important problems. In fixed-time stability, the settling time function is upper bounded.