Article
Engineering, Multidisciplinary
Keke Shi, Chuang Liu, Zhaowei Sun, Xiaokui Yue
Summary: This paper investigates the simplified electromagnetic force/torque model and coupled orbit-attitude dynamics modeling in spacecraft electromagnetic docking, and proposes an improved sliding mode control scheme based on planned trajectory. The research shows that dividing the tracking process of relative orbit and attitude into three parts and using a sliding mode control strategy can solve the tracking problem effectively.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Automation & Control Systems
Fanglai Zhu, Yuhang Fu, Thach Ngoc Dinh
Summary: In this paper, a novelty unknown input observer (UIO) is proposed for a linear system with unknown input, which can achieve asymptotic system state estimation and unknown input reconstruction simultaneously via interval observer. The interval estimation of the output vector is obtained by designing an interval observer under the assumption that the boundary of the unknown input is known. Then, an algebraic relationship between the unknown input and the system state is established based on the upper and lower boundary estimations of the output vector. A Luenberger-like state observer together with an algebraic unknown input reconstruction is designed to form a UIO based on the algebraic relationship. Furthermore, a UIO is applied directly on a time-delay system with unknown input, demonstrating the advantages of the proposed UIO. Simulation examples and comparisons to existing results are provided to illustrate the effectiveness and advantages of the proposed method.
Article
Automation & Control Systems
Yuezu Lv, Zhongkui Li, Zhisheng Duan
Summary: This paper presents a framework on minimal-order specified-time unknown input observers for linear systems based on a pairwise observer structure. It first proposes a minimal-order specified-time observer for the linear system without the unknown input that can exactly estimate the state at the preset time. Another form of the specified-time observer is designed to further reduce the computational burden. In the presence of the unknown input, a minimal-order specified-time unknown input observer is presented by introducing a singular transformation to decouple the effect of the unknown input, with strong observability as the sufficient and necessary condition. The robustness of the proposed observers is also discussed.
Article
Computer Science, Information Systems
Jiyu Zhu, Qikun Shen, Tianping Zhang, Yang Yi
Summary: This paper investigates the finite-time tracking problem of a class of nonlinear interconnected systems and proposes a novel finite-time adaptive fault-tolerant control scheme. The proposed scheme can ensure that each tracking error converges to a small neighborhood of the origin in finite time. Unlike existing research, this work considers the general case where the system input powers are unknown and larger than one, and applies input constraints to avoid actuator damage.
INFORMATION SCIENCES
(2024)
Article
Automation & Control Systems
He Kong, Mao Shan, Salah Sukkarieh, Tianshi Chen, Wei Xing Zheng
Summary: Recent progress has been made in Kalman filter (KF) with norm constraints on the state due to its potential applications in robotics and navigation. A noticeable discovery is that the KF gain has an analytical expression and the brute-force normalization is optimal in the mean-square sense. However, existing results are limited to cases where models/bounds or statistical properties of the disturbances are known.
Article
Engineering, Aerospace
Yu-chen Zhang, Meng-chen Ma, Xiao-Yan Yang, Shen-min Song
Summary: This study addresses the problem of fixed-time control for the autonomous proximity of non-cooperative targets with various constraints and disturbances. A 6-DOF relative motion model is constructed, and a fixed-time disturbance observer is proposed to estimate system disturbances using a radial basis function neural network. An adaptive fixed-time controller based on the back-stepping technique is designed to stabilize the relative error system with full-state constraints. The proposed controller guarantees fixed-time stability regardless of the constraints, and simulation scenarios validate its effectiveness and robustness.
Article
Automation & Control Systems
Zixin Huang, Xiao Wan, Liheng Wang, Lejun Wang, Hao Fu
Summary: In this paper, an optimal model reference adaptive control algorithm is proposed for unknown discrete-time nonlinear systems with input constraint, considering robustness to uncertainty. By using an input constraint auxiliary system, the original problem is transformed into an optimal regulation problem of an auxiliary error system with lumped uncertainty. The algorithm introduces an action-critic variable to achieve chattering-free sliding model control for the auxiliary error system, ensuring robustness to disturbance and neural network approximation error. The Lyapunov method is used to prove the uniformly ultimate bounded property, and the effectiveness of the algorithm is demonstrated through a simulation example.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Automation & Control Systems
Riccardo Marino, Patrizio Tomei
Summary: This article addresses the problem of global output tracking for stable minimum phase systems and proposes a hybrid adaptive output feedback control method to achieve global asymptotic output tracking even in the presence of input constraints.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Engineering, Aerospace
Chuang Liu, Xiaokui Yue, Jianqiao Zhang, Keke Shi
Summary: An active disturbance rejection control (ADRC) scheme is proposed for electromagnetic docking of spacecraft to handle time-varying delay, fault signals, external disturbances, and elliptical eccentricity. By introducing an intermediate observer (IO) and an auxiliary variable, the relative motion information and total disturbance can be estimated. The proposed ADRC scheme ensures convergence of relative position, relative velocity, and estimation errors. It has advantages in accuracy, robustness, and requirement of no prior knowledge.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Engineering, Aerospace
Wenhao Zhang, Xingling Shao, Wendong Zhang, Jiaping Qi, Haoze Li
Summary: In this paper, a novel appointed-time funnel control policy is proposed for quadrotors under environmental disturbances and parametric uncertainties. The control strategy utilizes unknown input observers to identify unknown system dynamics and regulates trajectory tracking error profiles within preassigned boundaries. The proposed approach improves the robustness of quadrotors and is validated through simulations and comparisons.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Chun-Yang Kong, Dang-Jun Zhao, Ming-Zhe Dai, Bu -Ge Liang
Summary: This paper proposes an event-triggered control strategy based on extended state observer (ESO) for the attitude tracking problem of small plug-and-play spacecraft with uncertain inertia parameters, external disturbances, and actuator faults. A simplified controller is developed based on the angular velocity and the general disturbances estimated by the provided ESO using the information of the system inputs and the angular velocities. The proposed event-triggered policy effectively balances the performance of event-triggering and the control stability performance, reducing the final state convergence regions without increasing triggering times compared to existing studies.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Automation & Control Systems
Bailiang Lyu, Xiaokui Yue, Chuang Liu
Summary: This article proposes a multi-observer-based fault-tolerant disturbance-rejection control strategy to solve the attitude stabilization problem of spacecraft subject to multisource complex disturbances. The strategy achieves simultaneous estimation of attitude information, actuator fault, and external disturbance through the introduction of intermediate variables. Based on these estimations, a fault-tolerant disturbance-rejection control strategy is developed. Numerical simulations demonstrate the effectiveness and superiority of the proposed strategy.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2022)
Article
Automation & Control Systems
Haifang Li, Bin Zhou, Wim Michiels
Summary: This article studies the design of prescribed-time full-and reduced-order unknown input observers for linear singular systems with input delay and demonstrates the effectiveness and superiority of the proposed approaches through comparative simulations.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2023)
Article
Automation & Control Systems
Jing Zhou, Tongxiang Li, Bo Chen, Li Yu
Summary: This article proposes a systematic design methodology for estimating unknown inputs in time-varying systems. By introducing intermediate variables to model the relationship between unknown inputs and system states, a modified Kalman filter is designed to estimate both system states and unknown inputs. The stability condition ensures that the mean square error of the intermediate Kalman filter is bounded.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2022)
Article
Automation & Control Systems
Jitao Li, Zhenhua Wang, Tarek Raissi, Yi Shen
Summary: This article presents a novel unknown input observer design for linear parameter-varying systems in a bounded error context. By integrating decoupling technique and set-membership approach, a compromise is achieved between the restrictiveness and the conservativeness of estimation. Numerical simulations demonstrate the validity of the presented method in a vehicle lateral dynamics system.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2021)
Article
Engineering, Aerospace
Chuang Liu, Keke Shi, Zhaowei Sun
ADVANCES IN SPACE RESEARCH
(2019)
Article
Engineering, Aerospace
Keke Shi, Chuang Liu, Zhaowei Sun
Article
Automation & Control Systems
Chuang Liu, Xiaokui Yue, Keke Shi, Zhaowei Sun
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2019)
Article
Engineering, Aerospace
Keke Shi, Chuang Liu, Zhaowei Sun, Xiaokui Yue
ADVANCES IN SPACE RESEARCH
(2020)
Article
Automation & Control Systems
Chuang Liu, Keke Shi, Xiaokui Yue, Zhaowei Sun
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2020)
Article
Engineering, Aerospace
Lei Xing, Jianqiao Zhang, Chuang Liu, Xiao Zhang
Summary: This paper investigates the attitude tracking control problem for spacecraft with limited communication using event-triggered based sliding mode control theory. By developing the attitude dynamics directly on the special orthogonal group SO(3), singularities and ambiguities associated with other attitude representations are avoided. The proposed coordinate-free adaptive event-triggered sliding mode controller effectively decreases the communication burden and ensures the closed-loop system to be uniformly ultimately bounded.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Automation & Control Systems
Yibo Ding, Xiaokui Yue, Chuang Liu, Honghua Dai, Guangshan Chen
Summary: An adaptive anti-saturation robust finite-time control algorithm (AARFTC) is proposed for a flexible air-breathing hypersonic vehicle (FAHV) in this study. The algorithm combines an adaptive fixed-time anti-saturation compensator (AFAC) and differentiator-based backstepping control to address saturation issues and improve the convergence speed and accuracy of the system.
Article
Engineering, Aerospace
Siyuan Li, Chuang Liu, Zhaowei Sun
Summary: This paper investigates a novel distributed hierarchical control method for small satellites by combining formation flying and satellite cluster. The method utilizes specific controllers to estimate and control external disturbances, maintain collision avoidance and desired communication range between satellites. Numerical simulations demonstrate the effectiveness of the proposed method.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Keke Shi, Chuang Liu, Zhaowei Sun, Xiaokui Yue
Summary: This paper investigates the simplified electromagnetic force/torque model and coupled orbit-attitude dynamics modeling in spacecraft electromagnetic docking, and proposes an improved sliding mode control scheme based on planned trajectory. The research shows that dividing the tracking process of relative orbit and attitude into three parts and using a sliding mode control strategy can solve the tracking problem effectively.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Aerospace
Chuang Liu, Xiaokui Yue, Ziyu Yang
Summary: This paper addresses the attitude stabilization and vibration suppression problem for post-capture flexible spacecraft, designing a hybrid nonfragile controller and testing whether nonfragile controllers are always better than fragile controllers in attitude control performance.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Chuang Liu, Xiaokui Yue, Jianqiao Zhang, Keke Shi
Summary: An active disturbance rejection control (ADRC) scheme is proposed for electromagnetic docking of spacecraft to handle time-varying delay, fault signals, external disturbances, and elliptical eccentricity. By introducing an intermediate observer (IO) and an auxiliary variable, the relative motion information and total disturbance can be estimated. The proposed ADRC scheme ensures convergence of relative position, relative velocity, and estimation errors. It has advantages in accuracy, robustness, and requirement of no prior knowledge.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Automation & Control Systems
Bailiang Lyu, Xiaokui Yue, Chuang Liu
Summary: This article proposes a multi-observer-based fault-tolerant disturbance-rejection control strategy to solve the attitude stabilization problem of spacecraft subject to multisource complex disturbances. The strategy achieves simultaneous estimation of attitude information, actuator fault, and external disturbance through the introduction of intermediate variables. Based on these estimations, a fault-tolerant disturbance-rejection control strategy is developed. Numerical simulations demonstrate the effectiveness and superiority of the proposed strategy.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2022)
Article
Engineering, Aerospace
Bailiang Lyu, Chuang Liu, Xiaokui Yue
Summary: This paper investigates a hybrid nonfragile intermediate observer-based T-S fuzzy attitude control strategy subject to multi-source complex disturbances for achieving integrated attitude stabilization and vibration suppression in flexible spacecraft. A refined T-S fuzzy model and a hybrid nonfragile observer are proposed to estimate state information and disturbance simultaneously. The quadratic stability and robust H-infinity performance of the closed-loop system are demonstrated via Lyapunov stability analysis with linear matrix inequalities (LMIs).
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Ziyu Yang, Chuang Liu, Xiaokui Yue, Ming Guo
Summary: This paper presents a negative imaginary output feedback H infinity synthesis strategy for addressing the issue of model parameters uncertainty in the vibration control of flexible spacecraft. The strategy considers the uncertainties of model parameters, controller gain perturbations, unknown inertia, and actuator faults simultaneously, guaranteeing asymptotic stability with H infinity performance and approximating to negative imaginary for the closed-loop attitude control system. An iterative algorithm under linear matrix inequality constraints provides the conditions for the existence of such controller. External disturbance and input saturation are also taken into account. Numerical simulations demonstrate the superiority of the proposed controller in attitude stabilization and vibration suppression of flexible spacecraft.
Article
Engineering, Aerospace
Andre F. P. Ribeiro, Carlos Ferreira, Damiano Casalino
Summary: This study compares a filament-based free wake panel method to experimental and validated numerical data in order to simulate propeller slipstreams and their interaction with aircraft components. The results show that the free wake panel method is able to successfully capture the slipstream deformation and shearing, making it a useful tool for propeller-wing interaction in preliminary aircraft design.
AEROSPACE SCIENCE AND TECHNOLOGY
(2024)
