کنترل مانور و ارتعاشات فضاپیمای انعطاف‌پذیر با الگوریتم کنترل مود لغزشی ترمینال غیرتکین و ورودی کوانتیده

This article presents the development of a quantized nonsingular terminal sliding mode algorithm, integrated with a strain rate feedback algorithm, for the concurrent control of both maneuvering and vibration suppression in a flexible spacecraft. The proposed nonsingular terminal maneuver control law produces continuous control inputs, which are subsequently transformed into quantized control signals through a specially designed quantizer, effectively mitigating the chattering phenomenon. The singularity problem is addressed through the implementation of the nonsingular terminal sliding mode algorithm. Furthermore, the proposed control law ensures high-precision motion along the sliding surface within a finite time, irrespective of uncertainties, rigid-flexible coupling dynamics, or external disturbances. The strain rate feedback algorithm, using piezoelectric sensors/actuators, remains active throughout the maneuver to reduce the system's residual vibrations. The overall system stability is proven using Lyapunov theory. One of the key features of the proposed maneuver control algorithm is its faster convergence compared to conventional algorithms. Simulations, conducted as a comparative study on large-angle maneuvers, highlight the algorithm’s advantages in preventing the excitation of high-frequency modes in flexible components, improving accuracy, enhancing convergence speed, reducing chattering, and minimizing control effort.