Super-twisting disturbance observer-based finite- time attitude stabilization of flexible spacecraft subject to complex disturbances

Abstract

There exist complex disturbances in the attitude control system of flexible spacecrafts, such as space environmental disturbances, flexible vibrations, inertia uncertainties, payload motions, etc. To suppress the effects of these disturbances on the performance of attitude stabilization, a super-twisting disturbance observer (STDO)-based nonsingular terminal sliding mode controller (NTSMC) is proposed in this paper. First, STDO is designed for a second-order dynamical system constructed by applying the lumped disturbance and its integral as state variables, and applying the integral as virtual measurement. Since the virtual measurement is obtained by integrating the inverse attitude dynamics, STDO not only avoids the differential operation of angular velocity, but also fully utilizes the information of a nonlinear model. By combining STDO with NTSMC, a composite controller is designed to achieve high-accuracy spacecraft attitude stabilization. Since most of the disturbances are compensated for by a STDO-based feedforward compensator, only a small switching gain is required to deal with the residual disturbances and uncertainties. Thus, the chattering phenomenon of the controller can be alleviated to a great extent. Finally, numerical simulations for the comparison between STDO-based NTSMC and nonlinear disturbance observer-based NTSMC are carried out in the presence of complex disturbances to verify the effectiveness of the proposed approach.

An Intuitive End-to-End Human-UAV Interaction System for Field Exploration

“…As the system Equation 18is observable, the STESO can be designed for this system by introducing a super-twisting algorithm (Yan and Wu, 2019):…”

Observer-Based Sliding Mode Control for Flexible Spacecraft With External Disturbance

“…as Lyapunov function candidate. According to (9), (10), (11) and (12), the time derivative of V 1 is given aṡ…”

“…In this control scheme, the switching gain in the part of sliding control law was small, and thus the chattering phenomenon can be reduced. A super-twisting disturbance observer was proposed in [11] to estimate a lumped disturbance combined by actuator faults, inertia uncertainties, internal and external disturbances and its integral. The estimation of the lumped disturbance integral was obtained by integrating the inverse attitude dynamics.…”

Observer-based multi-objective parametric design for spacecraft with super flexible netted antennas

“…For example, in 1958 the satellite named "Explorer-1" caused the energy dissipation in the system owing to the flexible vibration of the four whip antennas that eventually led to the attitude roll [1]. Therefore, vibration suppression and attitude control of spacecraft with large flexible attachments is a critical problem and it has received lots of attention [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Sliding mode control (SMC) and backstepping control are commonly used control methods in order to solve this problem.…”

“…The problems of robust H ∞ controller design with input constraints are considered in [11,12]. In addition to SMC, backstepping, and robust H ∞ control, many other control methods are also applied to the vibration suppression and attitude control of flexible satellites, such as disturbance observer-based control [13][14][15], adaptive control [16][17][18][19][20], and finite-time control [16,18,21]. Many of the current control methods are proposed for a single control target (e.g., [2][3][4][5][6][7][8][11][12][13][14][15][16][17][18][19][20][21]) to provide flexible spacecraft control.…”