Robust flight control for hypersonic flight vehicle using nonlinear disturbance observer

2015 ◽  
Author(s):  
Guoqiang Zhu ◽  
Jinkun Liu
Keyword(s):  
Flight Control ◽  
Disturbance Observer ◽  
Flight Vehicle ◽  
Nonlinear Disturbance Observer ◽  
Hypersonic Flight Vehicle ◽  
Hypersonic Flight ◽  
Nonlinear Disturbance ◽  
Robust Flight Control

scholarly journals Nonlinear Robust Control of a Hypersonic Flight Vehicle Using Fuzzy Disturbance Observer

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Lei Zhengdong ◽  
Wang Man ◽  
Yang Jianying
Keyword(s):  
Control System ◽  
Disturbance Observer ◽  
Sliding Mode ◽  
Inversion Method ◽  
Flight Vehicle ◽  
External Disturbances ◽  
Nonlinear Disturbance Observer ◽  
Hypersonic Flight Vehicle ◽  
Hypersonic Flight ◽  
Nonlinear Disturbance

This paper is concerned with a novel tracking controller design for a hypersonic flight vehicle in complex and volatile environment. The attitude control model is challengingly constructed with multivariate uncertainties and external disturbances, such as structure dynamic and stochastic wind disturbance. In order to resist the influence of uncertainties and disturbances on the flight control system, nonlinear disturbance observer is introduced to estimate them. Moreover, for the sake of high accuracy and sensitivity, fuzzy theory is adopted to improve the performance of the nonlinear disturbance observer. After the total disturbance is eliminated by dynamic inversion method, a cascade system is obtained and then stabilized by a sliding-mode controller. Finally, simulation results show that the strong robust controller achieves excellent performance when the closed-loop control system is influenced by mass uncertainties and external disturbances.

scholarly journals Robust Predictive Functional Control for Flight Vehicles Based on Nonlinear Disturbance Observer

2015 ◽  
Vol 2015 ◽  
pp. 1-16
Author(s):  
Yinhui Zhang ◽  
Huabo Yang ◽  
Zhenyu Jiang ◽  
Fan Hu ◽  
Weihua Zhang
Keyword(s):  
Flight Control ◽  
Disturbance Observer ◽  
Linear Structure ◽  
Flight Vehicle ◽  
Nonlinear Disturbance Observer ◽  
Flight Vehicles ◽  
Predictive Functional Control ◽  
State Dependent ◽  
Functional Control ◽  
Nonlinear Disturbance

A novel robust predictive functional control based on nonlinear disturbance observer is investigated in order to address the control system design for flight vehicles with significant uncertainties, external disturbances, and measurement noise. Firstly, the nonlinear longitudinal dynamics of the flight vehicle are transformed into linear-like state-space equations with state-dependent coefficient matrices. And then the lumped disturbances are considered in the linear structure predictive model of the predictive functional control to increase the precision of the predictive output and resolve the intractable mismatched disturbance problem. As the lumped disturbances cannot be derived or measured directly, the nonlinear disturbance observer is applied to estimate the lumped disturbances, which are then introduced to the predictive functional control to replace the unknown actual lumped disturbances. Consequently, the robust predictive functional control for the flight vehicle is proposed. Compared with the existing designs, the effectiveness and robustness of the proposed flight control are illustrated and validated in various simulation conditions.

scholarly journals Disturbance observer–based control of flexible hypersonic flight vehicle

2017 ◽  
Vol 14 (2) ◽  
pp. 172988141668695 ◽  
Author(s):  
Jianxin Ren ◽  
Daipeng Yang
Keyword(s):  
Disturbance Observer ◽  
External Disturbance ◽  
Elastic Vibration ◽  
Equivalent Model ◽  
Flight Vehicle ◽  
Structural Configuration ◽  
Aircraft Structure ◽  
Hypersonic Flight Vehicle ◽  
Hypersonic Flight ◽  
The Impact

In this article, the disturbance observer–based control is designed for a flexible hypersonic flight vehicle with the external disturbance. The aircraft structure is easy to cause elastic vibration, thus leading to serious change in structural configuration or even disintegration. Therefore, the impact of elasticity modal for altitude subsystem is described as a system disturbance, and then, the equivalent model is established. On this basis, considering the model structure and composition of nonlinear systems, the disturbance observer is used to eliminate the information of the disturbance. Finally, the simulation results make an offer to show that the disturbance observer–based control can provide a good tracking performance.

Robust Attitude Control for Quadrotors Based on Parameter Optimization of a Nonlinear Disturbance Observer

2019 ◽  
Vol 141 (8) ◽  
Author(s):  
Shatadal Mishra ◽  
Todd Rakstad ◽  
Wenlong Zhang
Keyword(s):  
Flight Control ◽  
Attitude Control ◽  
Disturbance Rejection ◽  
Disturbance Observer ◽  
Control Unit ◽  
Nonlinear Disturbance Observer ◽  
Wave Disturbances ◽  
Active Disturbance Rejection ◽  
Exogenous Disturbances ◽  
Nonlinear Disturbance

This paper presents a nonlinear disturbance observer (NDOB) for active disturbance rejection in the attitude control loop for quadrotors. An optimization framework is developed for tuning the parameter in the NDOB structure, which includes the infinity-norm minimization of the weighted sum of noise-to-output transfer function and load disturbance sensitivity function. Subsequently, the minimization generates an optimal value of the parameter based on the tradeoff between disturbance rejection and noise propagation in the system. The proposed structure is implemented on PIXHAWK, a real-time embedded flight control unit. Simulation tests are carried out on a custom built, high-fidelity simulator providing physically accurate simulations. Furthermore, experimental flight tests are conducted to demonstrate the performance of the proposed approach. The system is injected with step, sinusoidal, and square wave disturbances, and the corresponding system tracking performance is recorded. Experimental results show that the proposed algorithm attenuates the disturbances better compared to just a baseline controller implementation. The proposed algorithm is computationally cheap, an active disturbance rejection technique and robust to exogenous disturbances.

Disturbance observer based dynamic surface flight control for an uncertain aircraft

2017 ◽  
Vol 232 (4) ◽  
pp. 729-744 ◽  
Author(s):  
Jianjun Ma ◽  
Peng Li ◽  
Zhiqiang Zheng
Keyword(s):  
Flight Control ◽  
Disturbance Observer ◽  
Sliding Mode ◽  
Tracking Error ◽  
Small Neighborhood ◽  
Dynamic Surface ◽  
Nonlinear Disturbance Observer ◽  
Actuator Dynamics ◽  
Highly Nonlinear ◽  
Nonlinear Disturbance

To handle the flight control problem of an uncertain aircraft with highly nonlinear characteristics, internal uncertainties and external disturbances, an adaptive dynamic surface controller based on nonlinear disturbance observer is designed in this paper. A novel nonhomogeneous nonlinear disturbance observer is designed to approximate the uncertainties and disturbances, which can exactly estimate the disturbances in finite time. Dynamic surface control is utilized to avoid the explosion of complexity in traditional backstepping design. Through Lyapunov synthesis, the closed-loop control system is demonstrated to be semi-globally uniformly ultimately bounded and the tracking error converges to a small neighborhood of origin. Besides, actuator dynamics are taken into account, and the controller for actuator dynamics with consideration of limitation is developed based on sliding-mode control theory. The effectiveness of the proposed control is shown by simulation experiments.

scholarly journals Disturbance observer-based L1 robust tracking control for hypersonic vehicles with T-S disturbance modeling

2016 ◽  
Vol 13 (6) ◽  
pp. 172988141667111 ◽  
Author(s):  
Yang Yi ◽  
Lubing Xu ◽  
Hong Shen ◽  
Xiangxiang Fan
Keyword(s):  
Disturbance Observer ◽  
Tracking Error ◽  
Flight Vehicle ◽  
Longitudinal Models ◽  
Robust Tracking Control ◽  
Hypersonic Flight Vehicle ◽  
Hypersonic Flight ◽  
Flight Vehicles ◽  
Unknown Disturbances ◽  
Exogenous Disturbances

This article concerns a disturbance observer-based L1 robust anti-disturbance tracking algorithm for the longitudinal models of hypersonic flight vehicles with different kinds of unknown disturbances. On one hand, by applying T-S fuzzy models to represent those modeled disturbances, a disturbance observer relying on T-S disturbance models can be constructed to track the dynamics of exogenous disturbances. On the other hand, L1 index is introduced to analyze the attenuation performance of disturbance for those unmodeled disturbances. By utilizing the existing convex optimization algorithm, a disturbance observer-based proportional-integral-controlled input is proposed such that the stability of hypersonic flight vehicles can be ensured and the tracking error for velocity and altitude in hypersonic flight vehicle models can converge to equilibrium point. Furthermore, the satisfactory disturbance rejection and attenuation with L1 index can be obtained simultaneously. Simulation results on hypersonic flight vehicle models can reflect the feasibility and effectiveness of the proposed control algorithm.

scholarly journals Continuous Recursive Sliding Mode Control for Hypersonic Flight Vehicle with Extended Disturbance Observer

2015 ◽  
Vol 2015 ◽  
pp. 1-26 ◽  
Author(s):  
Yunjie Wu ◽  
Jianmin Wang
Keyword(s):  
Disturbance Observer ◽  
Sliding Mode ◽  
External Disturbance ◽  
Sliding Mode Controller ◽  
Flight Vehicle ◽  
Terminal Sliding Mode ◽  
Hypersonic Flight Vehicle ◽  
Hypersonic Flight ◽  
Compensation Factor ◽  
The Stability

A continuous recursive sliding mode controller (CRSMC) with extended disturbance observer (EDO) is proposed for the longitudinal dynamics of a generic hypersonic flight vehicle (HFV) in the presence of multiple uncertainties under control constraints. Firstly, sliding mode tracking controller based on a set of novel recursive sliding mode manifolds is presented, in which the chattering problem is reduced. The CRSMC possesses the merits of both nonsingular terminal sliding mode controller (NTSMC) and high-order sliding mode controller (HOSMC). Then antiwindup controller is designed according to the input constraints, which adds a dynamic compensation factor in the CRSMC. For the external disturbance of system, an improved disturbance observer based on extended disturbance observer (EDO) is designed. The external disturbance is estimated by the disturbance observer and the estimated value is regarded as compensation in CRSMC for disturbance. The stability of the proposed scheme is analyzed by Lyapunov function theory. Finally, numerical simulation is conducted for cruise flight dynamics of HFV, where altitude is 110000 ft, velocity is 15060 ft/s, and Mach is 15. Simulation results show the validity of the proposed approach.

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