Finite-time stabilization for a novel non-contact spacecraft with a small air-clearance range constraint. (15th November 2022)

• Record Type: Journal Article
• Authors: Liao, He; Qi, Jirong; Xie, Jinjin; Zhu, Zhu; Zhao, Yanbin; Feng, Junhua
• Is Part Of: Mechanical systems and signal processing. Volume 180(2022)
• Publication Date: 2022-11-15
• Subjects: Adaptive finite-time observer -- Non-contact spacecraft -- Non-singular terminal sliding mode controller -- Small air-clearance range constraint; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2022.109441
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: The novel non-contact spacecraft can achieve physical vibration isolation through the non-contact Lorentz actuator (NCLA), thereby providing ultra-high payload pointing accuracy and stability. However, due to the change in the relative position of magnet and coil, the NCLA can ensure accurate control input only in the linear working range, but not in the entire air-clearance range. To address this problem, this paper proposes an adaptive finite-time observer for the external and inner disturbance torques caused by the nonlinear effect of the NCLA. Moreover, a novel non-singular terminal sliding mode controller is proposed to guarantee the non-contact spacecraft architecture can rapidly enter into the linear range of the NCLA with a small air-clearance range constraint in a complex external environment. Simulations and experiments are conducted on the air-bearing platform with dual five-degree-of-freedom to verify the feasibility and effectiveness of the proposed approach.