Alipour Milad, Malekzadeh Maryam, Ariaei Alireza
Department of Mechanical Engineering, University of Isfahan, Iran.
ISA Trans. 2022 Sep;128(Pt A):162-173. doi: 10.1016/j.isatra.2021.10.022. Epub 2021 Oct 27.
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.
在本研究中，提出了一种新型自适应分数阶非奇异终端滑模（AFONTSM）控制器。构建了一种新颖的多功能滑模面，其目的是利用四元数误差和反作用轮角动量误差的分数阶差分，使反作用轮在每次姿态稳定机动后静止。利用李雅普诺夫定理研究了在不确定性和外部干扰下闭环系统的实际固定时间稳定性。将AFONTSM控制器的性能与现有的非奇异终端滑模（NTSM）、全阶NTSM和分数阶滑模控制器进行了比较。最后，通过在内部/外部干扰和不确定性条件下对航天器姿态控制子系统模拟器进行实际实验，研究了所提出的AFONTSM控制器在接近实际情况下的有效性；然后，将结果与先前的研究进行了比较。
