Attitude controller design for reusable launch vehicles during reentry phase via compound adaptive fuzzy H-infinity control

Abstract

In this paper, the attitude control problem of reusable launch vehicles (RLVs) during reentry phase is investigated by using compound adaptive fuzzy H-infinity control (CAFHC) strategy in the presence of parameter uncertainties and external disturbances. Firstly, the control-oriented attitude model is established by a model transformation based on the six-degree-of-freedom(6-DoF) dynamic model of the RLV. Secondly, a novel attitude control scheme is developed and the control strategy consists of two parts to achieve a stable and accurate attitude tracking during reentry flight process. An attitude tracking controller is designed utilizing adaptive fuzzy H-infinity control approach combined with an identification model to improve the attitude tracking performance in the interior of fuzzy approximation region of attitude angle. Next, an attitude stabilization controller based on boundary adaptive technique is employed to assure the robustness of the closed-loop system in the exterior of fuzzy approximation region of attitude angle. Furthermore, the stability of the closed-loop system is guaranteed within the framework of Lyapunov theory and the attitude tracking error converges to a small neighborhood around origin. Finally, the simulation results are presented to demonstrate that the effectiveness of the proposed control scheme for reentry RLV, and its tracking performance performs better than the other control method.

Hybrid FS–WNN approximator in indirect adaptive control of uncertain non‐linear MIMO systems

“…To the best of the authors' knowledge, no previous work has implemented a FS approximator in parallel to a WNN approximator, and combined the outputs of the two approximators using the modulation technique that was proposed by Ghavidel and Kalat [26], Ghavidel [27], Dian et al [28], Mao et al [29] as shown in Fig. 3.…”

Reentry attitude control for a reusable launch vehicle with aeroservoelastic model using type‐2 adaptive fuzzy sliding mode control

“…The fuzzy logic system (FLS) control method has been attached much attention during the past few years. Because FLS technique is an effective method to deal with the model uncertainties and nonlinear parts of the control system due to its good approximation, thus it has been extensively applied to design the flight control system for the vehicle . In order to enhance the tracking performance and achieve good robustness for the flight control system, FLS has usually been combined with other control approaches such as fault‐tolerant control and adaptive control .…”

“…Because FLS technique is an effective method to deal with the model uncertainties and nonlinear parts of the control system due to its good approximation, thus it has been extensively applied to design the flight control system for the vehicle. [24][25][26] In order to enhance the tracking performance and achieve good robustness for the flight control system, FLS has usually been combined with other control approaches such as fault-tolerant control 27 and adaptive control. 28 In addition, a type-2 FLS, which can provide additional design degrees of freedom in Mamdani and Takagi-Sugeno-Kang FLSs, is more effective when such system is used in situations where lots of uncertainties are present compared with type-1 FLS.…”

Adaptive fault-tolerant attitude control for reentry vehicle involving actuator saturation

“…Many attitude control methods have been proposed for improving the control performance of reentry vehicle. 6–13 Liang et al. proposed a decoupling trajectory tracking method to improve attitude stability of the reentry vehicle.…”

“…10 Among these many proposed attitude control methods, all of them were designed basing on the assumption that the actuator is functioning normally. 6–13 However, the adverse aerodynamic environment and constantly changing flight condition during the reentry process, makes difficulties for satisfying the assumption as the actuator may be come up with faults like loss of effectiveness, float, etc. If we do not take into account the fault tolerant capability, the reentry may fail or catastrophic accident may happen even though there is only a small actuator fault.…”