Zhijie Liu

TL;DR: It is shown that the state of the system is proven to converge to a small neighborhood of zero in the presence of the varying length, varying speed and input constraint.

TL;DR: In this article, an adaptive fault tolerant control strategy is developed to suppress the vibrations of the flexible panel in the course of the attitude stabilization, and a Lyapunov-based stability analysis is conducted to determine whether the system energies, angular velocities and transverse deflections, remain bounded and asymptotically decay to zero in the case of infinite number of actuator failures.

TL;DR: A robust adaptive fault tolerant control such that the global stability of the resulting closed-loop cascaded system is ensured and asymptotic tracking can be achieved subject to actuator failures, parameter uncertainty and external disturbances.

TL;DR: Under the proposed control, the uniformly ultimately bounded stability of the closed loop system is achieved through rigorous Lyapunov analysis without any discretization or simplification of the dynamics in the time and space.

TL;DR: A disturbance observer is designed to estimate and compensate for the disturbances including the external disturbance and vibration from the flexible appendages and a sample state feedback control scheme is proposed for flexible spacecraft subject to input magnitude and rate constrains, using the linear matrix inequality (LMI) and Lyapunov direct method.