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学者姓名：张利国
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摘要 ：
In contrast to the fruitful results in saturated control of ordinary differential equation (ODE) systems, there are few related studies for hyperbolic partial differential equation (PDE) systems. This paper focuses on the saturated boundary feedback stabilization problem for the Lighthill-Whitham-Richards (LWR) traffic flow model, in which a variable speed limit (VSL) device is applied at the downstream boundary in the presence of actuator saturation and a saturated boundary feedback controller is proposed to drive the traffic density to the steady state. By employing the Lyapunov function method along with a modified local sector condition, sufficient conditions for ensuring the local exponential stability of the LWR traffic flow system are developed in C1-norm. Remarkably, the proposed sufficient conditions establish a relationship between the control gain and the region of exponential stability (RES), and thus the maximal RES can be determined by introducing an optimization criterion. Lastly, numerical simulations are performed to verify the effectiveness of the theoretical results.(c) 2023 Elsevier B.V. All rights reserved.
关键词 ：
Actuator saturation Actuator saturation Lyapunov function Lyapunov function LWR traffic flow model LWR traffic flow model Sector condition Sector condition Boundary control Boundary control
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| GB/T 7714 | Zhao, Hanxu , Zhan, Jingyuan , Zhang, Liguo . Saturated boundary feedback stabilization for LWR traffic flow model [J]. | SYSTEMS & CONTROL LETTERS , 2023 , 173 . |
| MLA | Zhao, Hanxu 等. "Saturated boundary feedback stabilization for LWR traffic flow model" . | SYSTEMS & CONTROL LETTERS 173 (2023) . |
| APA | Zhao, Hanxu , Zhan, Jingyuan , Zhang, Liguo . Saturated boundary feedback stabilization for LWR traffic flow model . | SYSTEMS & CONTROL LETTERS , 2023 , 173 . |
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摘要 ：
本发明公开了一种基于分布式最优控制的智能网联车匝道合并方法，以最小化各智能车的通行时间和能耗为目标，解决了一种从不同道路到匝道合并点的最优控制问题。首先基于合并约束和安全约束，得到了单个智能车的最优轨迹，随后扩展到多匝道合并段的车辆协调。本发明提出了两阶段优化策略，即先对控制区域内的所有车辆进行上层排序，再根据排序计算车辆的下层输入。最后通过SUMO和Python的协同仿真验证该方法的有效性。结果表明，与传统的车辆相比，最优控制下的车辆的油耗和行驶时间都得到了显著的降低，该发明为以后分布式最优控制提高交通效率奠定了基础。
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| GB/T 7714 | 张利国 , 吴卓群 , 刘旭东 . 一种基于分布式最优控制的智能网联车匝道合并方法 : CN202110182147.7[P]. | 2021-02-09 . |
| MLA | 张利国 等. "一种基于分布式最优控制的智能网联车匝道合并方法" : CN202110182147.7. | 2021-02-09 . |
| APA | 张利国 , 吴卓群 , 刘旭东 . 一种基于分布式最优控制的智能网联车匝道合并方法 : CN202110182147.7. | 2021-02-09 . |
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摘要 ：
With the rapid development of autonomous driving techniques, the cyber-attack issue has emerged as a serious concern due to the cyber vulnerability of autonomous vehicles. In this paper, we consider the cyber security for the autonomous vehicular flow which suffers from the cyber-attack signals on speed dynamics. To address this problem, the Aw-Rascle-Zhang model is extended by considering the unknown cyber-attack to the autonomous vehicles. A novel simultaneous state and input estimation algorithm is developed for the cyber-attack ARZ model by using the boundary observer. The exponential stability of the simultaneous estimation algorithm is given with a set of inequality conditions. Finally, numerical simulation illustrates that the proposed algorithm can estimate the traffic flow state and unknown cyber-attack simultaneously.
关键词 ：
Boundary observer Boundary observer Cyber-attack ARZ model Cyber-attack ARZ model Exponential stability Exponential stability Simultaneous estimation Simultaneous estimation
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| GB/T 7714 | Wu, Jiahao , Luan, Haoran , Zhang, Liguo . Simultaneous State and Cyber-attack Estimation for Autonomous Vehicular Flow Models via Boundary Observers [C] . 2021 : 262-267 . |
| MLA | Wu, Jiahao 等. "Simultaneous State and Cyber-attack Estimation for Autonomous Vehicular Flow Models via Boundary Observers" . (2021) : 262-267 . |
| APA | Wu, Jiahao , Luan, Haoran , Zhang, Liguo . Simultaneous State and Cyber-attack Estimation for Autonomous Vehicular Flow Models via Boundary Observers . (2021) : 262-267 . |
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摘要 ：
We develop backstepping state feedback control to stabilize a moving shockwave in a freeway segment under bilateral boundary actuations of traffic flow. A moving shockwave, consisting of light traffic upstream of the shockwave and heavy traffic downstream, is usually caused by changes of local road situations. The density discontinuity travels upstream and drivers caught in the shockwave experience transitions from free to congested traffic. Boundary control design in this article brings the shockwave front to a static setpoint position, hindering the upstream propagation of traffic congestion. The traffic dynamics are described with Lighthil-Whitham-Richard model, leading to a system of two first-order hyperbolic partial differential equations (PDEs). Each represents the traffic density of a spatial domain segregated by the moving interface. By Rankine-Hugoniot condition, the interface position is driven by flux discontinuity and thus governed by an ordinary differential equation (ODE) dependent on the PDE states. The control objective is to stabilize both the PDE states of traffic density and the ODE state of moving shock position to setpoint values. Using delay representation and backstepping method, we design predictor feedback controllers to cooperatively compensate state-dependent input delays to the ODE. From Lyapunov stability analysis, we show local stability of the closed-loop system in H1 norm with an arbitrarily fast convergence rate. The stabilization result is demonstrated by a numerical simulation and the total travel time of the open-loop system is reduced by 12% in the closed loop.
关键词 ：
Lighthil-Whitham-Richard (LWR) traffic model Lighthil-Whitham-Richard (LWR) traffic model partial differential equations-ordinary differential equation (PDE partial differential equations-ordinary differential equation (PDE moving shockwave moving shockwave state-dependent delay compensation state-dependent delay compensation Backstepping control Backstepping control ODE) coupled system ODE) coupled system
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| GB/T 7714 | Yu, Huan , Diagne, Mamadou , Zhang, Liguo et al. Bilateral Boundary Control of Moving Shockwave in LWR Model of Congested Traffic [J]. | IEEE TRANSACTIONS ON AUTOMATIC CONTROL , 2021 , 66 (3) : 1429-1436 . |
| MLA | Yu, Huan et al. "Bilateral Boundary Control of Moving Shockwave in LWR Model of Congested Traffic" . | IEEE TRANSACTIONS ON AUTOMATIC CONTROL 66 . 3 (2021) : 1429-1436 . |
| APA | Yu, Huan , Diagne, Mamadou , Zhang, Liguo , Krstic, Miroslav . Bilateral Boundary Control of Moving Shockwave in LWR Model of Congested Traffic . | IEEE TRANSACTIONS ON AUTOMATIC CONTROL , 2021 , 66 (3) , 1429-1436 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The boundary feedback control of networks of freeway traffic is considered in this article by means of the partial differential equation (PDE)-based techniques. The control and measurements are all located at the boundaries of each link. We have established the boundary control model for the system, a linear hyperbolic system of balance laws, which includes not only the traffic flow dynamics of the network described by combining the linearized Aw-Rascle-Zhang (ARZ) traffic flow model of each link but also the integrated on-ramping metering and variable speed limit control modeled as the boundary condition. As the traffic demand of the network is fluctuated, the boundary input-to-state stability (ISS) controller is designed to suppress the disturbance and regulate the traffic flow into the boundedness regions of the desired states. Based on a novel Lyapunov function, some sufficient conditions in terms of the matrix inequalities are derived for the ISS boundary stabilization in the L-2-norm. The numerical simulation is given to illustrate the effectiveness of the developed boundary feedback control. Moreover, an interesting traffic experiment is carried out by using the traffic simulation software, AIMSUN, and some specific traffic data are collected and analyzed to verify the feasibility and effectiveness of the boundary control.
关键词 ：
Numerical simulation Numerical simulation input-to-state stability (ISS) input-to-state stability (ISS) Mathematical model Mathematical model Feedback control Feedback control AIMSUN AIMSUN Adaptation models Adaptation models traffic flow model traffic flow model Traffic control Traffic control Numerical models Numerical models freeway traffic networks freeway traffic networks boundary feedback control boundary feedback control Steady-state Steady-state
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| GB/T 7714 | Zhang, Liguo , Luan, Haoran , Lu, Yusheng et al. Boundary Feedback Stabilization of Freeway Traffic Networks: ISS Control and Experiments [J]. | IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY , 2021 , 30 (3) : 997-1008 . |
| MLA | Zhang, Liguo et al. "Boundary Feedback Stabilization of Freeway Traffic Networks: ISS Control and Experiments" . | IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY 30 . 3 (2021) : 997-1008 . |
| APA | Zhang, Liguo , Luan, Haoran , Lu, Yusheng , Prieur, Christophe . Boundary Feedback Stabilization of Freeway Traffic Networks: ISS Control and Experiments . | IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY , 2021 , 30 (3) , 997-1008 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This article designs an optimal observer-based output feedback control for traffic breakdown to dissolve traffic congestion using the backstepping method and optimization. The linearized Aw-Rascle-Zhang model is used to represent the congested traffic dynamics resulting from traffic breakdown. Based on the factors leading to traffic breakdown, we take into account the boundary conditions consisting of a boundary with a constant density and a speed drop at the upstream inlet of a bottleneck, and a boundary with a disturbance of inflow (high traffic demand) at the inlet of the road segment under consideration. To dissolve traffic congestion, a dynamic feedback controller is designed at the upstream boundary. By using the backstepping approach, an observer-based output feedback controller is computed to guarantee the integral input-to-state stability of the closed-loop system. By establishing an optimization problem and solving it, the optimal value of the considered class controller is obtained. The performance of the output feedback controller is also validated by numerical simulations.
关键词 ：
optimization optimization backstepping backstepping high traffic demand high traffic demand linearized ARZ traffic flow model linearized ARZ traffic flow model observer-based output feedback control observer-based output feedback control
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| GB/T 7714 | Guan, Lina , Zhang, Liguo , Prieur, Christophe . Optimal observer-based output feedback controller for traffic congestion with bottleneck [J]. | INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL , 2021 , 31 (15) : 7087-7106 . |
| MLA | Guan, Lina et al. "Optimal observer-based output feedback controller for traffic congestion with bottleneck" . | INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL 31 . 15 (2021) : 7087-7106 . |
| APA | Guan, Lina , Zhang, Liguo , Prieur, Christophe . Optimal observer-based output feedback controller for traffic congestion with bottleneck . | INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL , 2021 , 31 (15) , 7087-7106 . |
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摘要 ：
Microwave plasma chemical vapor deposition (MPCVD) offers us a new option to realize high-temperature epitaxy. In this work, AlN films were deposited on 6H-SiC substrates by MPCVD. The epitaxy was carried out without the participation of ammonia. The results reveal that workable temperature for AlN epitaxy is from 1300 degrees C-1450 degrees C. X-ray rocking curves and X-ray photoelectron spectroscopy confirm the improved crystalline quality of AlN grown at higher temperatures. The narrowest FWHM of X-ray rocking curves for AlN (0002) and (10-12) are 142 and 350 arcsec at 1450 degrees C, respectively. Possible growth mechanisms are suggested.
关键词 ：
ammonia free ammonia free aluminum nitride aluminum nitride MPCVD MPCVD high-temperature epitaxy high-temperature epitaxy
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| GB/T 7714 | Zhang, Yao , Xing, Yanhui , Han, Jun et al. Improving AlN crystalline quality by high-temperature ammonia-free microwave plasma chemical vapor deposition [J]. | APPLIED PHYSICS EXPRESS , 2021 , 14 (5) . |
| MLA | Zhang, Yao et al. "Improving AlN crystalline quality by high-temperature ammonia-free microwave plasma chemical vapor deposition" . | APPLIED PHYSICS EXPRESS 14 . 5 (2021) . |
| APA | Zhang, Yao , Xing, Yanhui , Han, Jun , Zhang, Xuan , Zhang, Xuemin , Zhang, Li et al. Improving AlN crystalline quality by high-temperature ammonia-free microwave plasma chemical vapor deposition . | APPLIED PHYSICS EXPRESS , 2021 , 14 (5) . |
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摘要 ：
State estimate of traffic flow of a freeway segment is considered by using the method of boundary observer design. The observer control and measurements are all located at the boundaries. The nonequilibrium traffic flow dynamics are modeled as a Markov jump linear hyperbolic system with phase transitions. Based on the Lyapunov techniques, the sufficient conditions of matrix inequalities are derived for the exponentially mean-square static as well as the dynamic boundary observer design. Using real traffic data of vehicle trajectories from the Next Generation Simulation (NGSIM) project, the developed stochastic phase transition model of the nonequilibrium traffic flow is calibrated. Moreover, the simulation results illustrate the effectiveness of the boundary observer design for traffic estimation.
关键词 ：
Data models Data models Observers Observers Next Generation Simulation (NGSIM) Next Generation Simulation (NGSIM) Traffic control Traffic control Markov processes Markov processes Trajectory Trajectory Boundary observers Boundary observers Markov jump linear hyperbolic systems Markov jump linear hyperbolic systems Mathematical model Mathematical model Vehicle dynamics Vehicle dynamics nonequilibrium traffic flow nonequilibrium traffic flow exponentially mean-square stability exponentially mean-square stability
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| GB/T 7714 | Zhang, Liguo , Li, Xiaoli , Hao, Jianru et al. Boundary Observer Design for Stochastic Phase Transition Models of Nonequilibrium Traffic Flow [J]. | IEEE TRANSACTIONS ON AUTOMATIC CONTROL , 2021 , 66 (10) : 4828-4835 . |
| MLA | Zhang, Liguo et al. "Boundary Observer Design for Stochastic Phase Transition Models of Nonequilibrium Traffic Flow" . | IEEE TRANSACTIONS ON AUTOMATIC CONTROL 66 . 10 (2021) : 4828-4835 . |
| APA | Zhang, Liguo , Li, Xiaoli , Hao, Jianru , Qiao, Junfei . Boundary Observer Design for Stochastic Phase Transition Models of Nonequilibrium Traffic Flow . | IEEE TRANSACTIONS ON AUTOMATIC CONTROL , 2021 , 66 (10) , 4828-4835 . |
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摘要 ：
In this paper, we address the consensus-based dynamic boundary observer design, where the freeway traffic network modelled by the linearized Aw-Rascle-Zhang traffic flow model is observed by a network of sensors. inspired by the consensus based static boundary observer design for the finite-dimensional ordinary differential equation systems, we further propose a consensus-based dynamic boundary observer and directly analyze the delectability for the infinite dimensional traffic system by means of Lyapunov techniques. The sufficient conditions for the distributed consensus-based boundary observer in terms of matrix inequalities are also provided. Finally, the performance of the proposed approach is tested by some numerical simulations.
关键词 ：
Freeway Traffic Network Freeway Traffic Network ARZ Model ARZ Model Traffic State Estimation Traffic State Estimation Distributed Boundary Observer Distributed Boundary Observer
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| GB/T 7714 | Lu, Yusheng , Luan, Haoran , Zhang, Liguo . Consensus-Based Dynamic Boundary Observer Design for Freeway Traffic Networks [C] . 2020 : 5473-5478 . |
| MLA | Lu, Yusheng et al. "Consensus-Based Dynamic Boundary Observer Design for Freeway Traffic Networks" . (2020) : 5473-5478 . |
| APA | Lu, Yusheng , Luan, Haoran , Zhang, Liguo . Consensus-Based Dynamic Boundary Observer Design for Freeway Traffic Networks . (2020) : 5473-5478 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this paper, we address the consensus-based dynamic boundary observer design, where the freeway traffic network modelled by the linearized Aw-Rascle-Zhang traffic flow model is observed by a network of sensors. Inspired by the consensus-based static boundary observer design for the finite-dimensional ordinary differential equation systems, we further propose a consensus-based dynamic boundary observer and directly analyze the detectability for the infinite dimensional traffic system by means of Lyapunov techniques. The sufficient conditions for the distributed consensus-based boundary observer in terms of matrix inequalities are also provided. Finally, the performance of the proposed approach is tested by some numerical simulations. © 2020 Technical Committee on Control Theory, Chinese Association of Automation.
关键词 ：
Traffic control Traffic control Highway planning Highway planning Ordinary differential equations Ordinary differential equations
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| GB/T 7714 | Lu, Yusheng , Luan, Haoran , Zhang, Liguo . Consensus-Based Dynamic Boundary Observer Design for Freeway Traffic Networks [C] . 2020 : 5473-5478 . |
| MLA | Lu, Yusheng et al. "Consensus-Based Dynamic Boundary Observer Design for Freeway Traffic Networks" . (2020) : 5473-5478 . |
| APA | Lu, Yusheng , Luan, Haoran , Zhang, Liguo . Consensus-Based Dynamic Boundary Observer Design for Freeway Traffic Networks . (2020) : 5473-5478 . |
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