A practical attitude control scheme for hypersonic vehicle based on disturbance observer

Abstract

This paper proposes a practical three-channel attitude control scheme for hypersonic vehicle based on the linear active disturbance rejection control. The control scheme considers the weak and strong coupling scenarios separately due to the dynamic characteristics. For the weak coupling case, three linear active disturbance rejection controllers are designed for the Euler angles of the three channels, respectively, to deal with the strong uncertainties. The expected stability margin and dynamic performance can be guaranteed through the stability margin tester tuning method. Moreover, the control scheme for the pitch, yaw, and roll angles can be applied to the control of the angle of attack, the sideslip angle and the bank angle directly according to the flight dynamics of the hypersonic vehicle, thus realizing a unified control framework for all the attitude angles. For the strong coupling scenario like the fast reversal maneuver, the inner-loop angular rate feedback is performed first in this paper to enhance the damping characteristics, and then linear active disturbance rejection control is designed for the augmented plant to eliminate the strong coupling effects. Simulation results demonstrate the satisfactory tracking and disturbance rejection ability of the proposed methods.

Disturbance observer–based super-twisting sliding mode control for formation tracking of multi-agent mobile robots

“…Concerning the leader-follower pair, its formation dynamics on Assumptions 1, 2, and 3 are determined by equations (9) and (13), its disturbance observer is designed by equation (25), its sliding surface vector is described by equation (29), and its supertwisting sliding mode control law via the disturbance observer is given by equation (32). Then, the closedloop control system of this pair becomes asymptotically stable despite the uncertainties and disturbances if equation (34) holds true…”

“…In equation (39), we will have _ V \ 0 if equation (34) holds true. This indicates that the leader-follower pair is of asymptotically stable in the sense of Lyapunov.…”

“…Concerning the supertwisting sliding mode formation maneuvers, it is possible to avoid the overestimate problem of the gain by the disturbance observer technique. So far, it is reported that the disturbance observer technique has been successfully applied to mechatronics systems, [28][29][30][31] chemical and process systems, 32 biological systems, 33 aerospace systems, 34 and so on. This paper adopts the technique for the super-twisting sliding mode formation maneuvers of uncertain multi-robot systems.…”

Practical Energy Dissipation Control of Near Space Glider on Independent Longitudinal Plane

“…Here, a combined aerodynamic model of [3,40,42,43] is employed, which is slightly modified so it is suitable for a wider range of angle of attack. The aerodynamic forces can be calculated as…”

“…An effective and weak model-dependent control strategy, which has a similar framework of the PID controller, is desired to regulate the attitude in reality. Recently, active disturbance rejection control (ADRC) [27,28], as an extension of traditional PID controller, has been widely used in industrial applications [29][30][31][32][33][34][35][36][37][38], and flight control is possibly the most active arena of ADRC [15,[38][39][40][41][42]. In the design, the ADRC only needs an open-loop control gain, which can be obtained relatively accurately than other characteristic parameters and can significantly reduce difficulty of modelling.…”