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IEEE Information technology and Mechatronics Engineering Conference (ITOEC)

作者： Tingwei Fu Zhan Wen Jianwei Liu Zheng Zheng Wenzao Li School of Communication Engineering Chengdu University of Information Technology Chengdu Sichuan China Science and Technology on Aircraft Control Laboratory Beihang University Beijing China

ISBN: (纸本)9781538653746

Delay Tolerant Network (DTN) is playing a pivotal role in the future human living areas, especially in the future development of smart cities. In the future smart cities, the available energy resources are very limited. In this condition, the intelligent transmission is required as soon as possible, to achieve the goal of saving energy resources. At present, most of the researches focus on optimizing the transmission unit or routing algorithm for prolonging the network life time. There is no good adaptive energy saving scheme according to urban environmental rules. In this paper, an energy protection mechanism under human encounter characteristics is proposed in terms of AESS (Adaptive Energy Saving Scheme based on geographic grid) approach, which can be applied to various DTN routing protocols such as Epidemic, Prophet, ADAF etc. According to the rules in the urban scenarios, nodes can sleep dynamically to save energy. Simulation results verify the performance of proposed AESS which is used in Epidemic, Prophet and ADAF , under an urban scenario, are better than the corresponding original algorithm in delivery ratio, network overhead ratio and energy consumption status.

关键词： Urban areas Routing Heuristic algorithms Energy consumption Energy resources Wavelength division multiplexing Simulation

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Block Backstepping Trajectories Tracking control for Unmanned Helicopters

Block Backstepping Trajectories Tracking Control for Unmanne...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： Xin Yu Xiangyu Wang Shihua Li Jiyu Liu Ya Zhang Ministry of Education Key Laboratory of Measurement and Control of Complex Systems of Engineering PR China Aviation Key Laboratory of Science and Technology on Aircraft Control. Facri. Xian PR China

This paper proposes a block backstepping trajectories tracking control scheme for a class of unmanned helicopters. The control objective is to make the position and yaw angle trajectories of the helicopter track the desired position and yaw angle trajectories. In order to design the controller, the helicopter system is divided into three subsystems at first. Then based on the block backstepping technique, four control inputs which constitute the helicopter controller are designed step by step in three subsystems. The asymptotic stability of the closed-loop helicopter trajectories tracking error system is verified based on Lyapunov stability analysis. Finally, numerical simulations demonstrate the effectiveness of the proposed block backstepping control scheme.

关键词： Helicopters Backstepping Trajectory tracking Trajectory Aerodynamics Process control control design

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Practical stability of integral-based event-triggered control systems 36

Practical stability of integral-based event-triggered contro...

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第36届中国控制会议

作者： Hao Yu Fei Hao The Seventh Research Division School of Automation Science and Electrical EngineeringBeihang University Science and Technology on Aircraft Control Laboratory Beihang University

ISBN: (纸本)9781538629185

This paper studies the practical stabilization of nonlinear event-triggered control systems in the presence of bounded *** integral-based triggering condition is employed to generate the *** event is triggered when the integral of the absolute measurement error,between the latest sampled and the current states,violates a time-varying *** is proved that the closed-loop nonlinear system is practically stable,i.e.,the state of the system is bounded with a bound depending on the initial state,the bound of the disturbances,and the parameters in the triggering ***,a positive estimate of minimum inter-event time is provided to exclude the Zeno ***,for the integral-based event-triggered control,it is shown that a pre-specified upper bound of inter-event times is necessary to ensure the practical ***,a numerical example is provided to illustrate the efficiency and the feasibility of the obtained results.

关键词： Event-triggered control Nonlinear systems Integral-based triggering condition Practical stability

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Performance of Non-Orthogonal Multiple Access (NOMA) in a C-RAN System 86

Performance of Non-Orthogonal Multiple Access (NOMA) in a C-...

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86th IEEE Vehicular technology Conference (VTC-Fall)

作者： Singh, Rupesh Zhu, H. Wang, J. Seventh Research Division Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing China

ISBN: (纸本)9781509059355

Cloud radio access network (C-RAN) has been proposed as a novel mobile network architecture allowing centralized processing. Resource allocation (RA) is the core task in order to coordinate transmissions. In this paper efficient resource allocation technique in non-orthogonal multiple access (NOMA) based C-RAN systems is proposed. The task of RA is solved by centralized solutions in a C-RAN. The problem of maximizing the weighted sum-rate of users with target quality of service (QoS) is addressed subject to various constraints. The problem is divided into sub-problems and then sub-optimal solutions are proposed. Numerical experiments show that the proposed algorithms can improve the system performance as compared to orthogonal multiple access (OMA)-based C-RAN systems.

关键词： Resource management NOMA Quality of service Multiplexing Throughput Scheduling Baseband

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Security control for Linear Systems subject to Denial-of-Service Attacks 36

Security Control for Linear Systems subject to Denial-of-Ser...

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第36届中国控制会议

作者： Tingting Cui Hao Yu Fei Hao The Seventh Research Division School of Automation Science and Electrical EngineeringBeihang University Science and Technology on Aircraft Control Laboratory Beihang University

ISBN: (纸本)9781538629185

This paper studies the stability of event-triggered control systems subject to Denial-of-Service *** improved method is provided to increase frequency and duration of the DoS attacks where closed-loop stability is not destroyed.A twomode switching control method is adopted to maintain stability of event-triggered control systems in the presence of ***,this paper reveals the relationship between robustness of systems against DoS attacks and lower bound of the interevent times,namely,enlarging the inter-execution time contributes to enhancing the robustness of the systems against DoS ***,some simulations are presented to illustrate the efficiency and feasibility of the obtained results.

关键词： Event-triggered control secure control linear systems DoS attacks

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Infrared epsilon-near-zero absorption excited by magnetic dipole resonance

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Optics Communications 2020年 472卷

作者： Ya Li Peng Zhang Yanning Liu Ruomei Jiang Yu Gong Longjiang Deng Peiheng Zhou National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of China Chengdu 611731 China Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu 611731 China Shenyang Aircraft Design and Research Institute Shenyang 110035 China

In natural or artificial Epsilon-near-zero (ENZ) materials, excitation of the absorption at ENZ point requires large incident-angle or polarization dependence, and thus become limited in practical applications. In this paper, the magnetic dipole resonance in a metal-ENZ-insulator–metal structure breaks such restrictions on ENZ absorption, by providing a critical longitudinal electric field to the embedded ENZ material. In numerical and corresponding experimental realizations, a thin SiO 2 film in the metal-ENZ-insulator–metal structure serves as the ENZ layer at mid-infrared and holds the ENZ absorption at both TE and TM polarizations under normal incidence. The cooperation of ENZ absorption, magnetic dipole mode and the loss of SiO 2 film further results in infrared absorption enhancement and band-width broadening.

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Adaptive nonlinear control of autonomous spacecraft rendezvous and proximity operations

Adaptive nonlinear control of autonomous spacecraft rendezvo...

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AIAA Guidance, Navigation, and control Conference, 2017

作者： Sun, Liang Huo, Wei Jiao, Zongxia The Seventh Research Division Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

ISBN: (数字)9781624104503

ISBN: (纸本)9781624104503

An adaptive nonlinear control strategy is proposed for a pursue spacecraft in proximity operations on a non-cooperative target in space. The relative position vector between the pursuer and the target is required to direct towards the docking port of the target while the attitude of the two bodies must be synchronized. This formulation results in a highly nonlinear, highly coupled and uncertain system that poses a challenging control problem. The proposed relative pose model between the two spacecraft are expressed as the classical Euler-Lagrange equations to facilitate and simplify the relative pose controller design. An integrated controller of relative translation and relative rotation is formulated by using adaptive nonlinear state feedback control. The parametric uncertainties, unknown coupled dynamics and bounded external disturbances are compensated online with the norm-estimation-based adaptive update laws. It is proved via Lyapunov stability theory that the tracking errors of relative position and relative attitude are uniformly ultimately bounded. Numerical simulation demonstrates the effectiveness of the proposed controller. © 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Space rendezvous

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Fault Tolerant control for Civil aircraft with Actuator Faults and Rate Limit

Fault Tolerant Control for Civil Aircraft with Actuator Faul...

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IEEE Chinese Guidance, Navigation and control Conference (CGNCC)

作者： Zhenmin Wang Lirong Li Yishi Liu Qingdong Li Xiwang Dong Zhang Ren School of Automation Science and Electronic Engineering Science and Technology on Aircraft Control Laboratory Beihang University Beijing P.R. Shanghai Civil Aircraft Health Monitoring Engineering Technology Research Center Shanghai P.R.china

ISBN: (数字)9781538611715

ISBN: (纸本)9781538611722

In this paper, a rate limit control scheme based on model reference adaptive control is studied for longitudinal motion of civil aircraft with actuator failure and saturation nonlineanty. Both actuator failures and constraints are important factors that affect the stability and performance of the flight control system. As described above, the fault tolerance control method is adjusted by using an adaptive law based on a Lyapunov function. Addition and multiplication faults are considered in the designed controller to deal with loss of effectiveness of actuator failure. In addition, the basic controller and the fault-tolerant controller use different technologies for their different constructions to end. Proof of the stability of the two improved controllers is proposed. These improved controllers improve the performance of the control system operating in the presence of actuator failure and saturation. Finally, numerical examples of anti-saturation fault-tolerant controllers for civil aircraft are presented. The proposed fault-tolerant control scheme can improve stability and performance.

关键词： Actuators aircraft Aerospace control Additives Fault tolerant systems Fault tolerant control

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Brain-actuated Humanoid Robot based on Brain-computer Interface (BCI)

Brain-actuated Humanoid Robot based on Brain-computer Interf...

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IEEE International Conference on Automation, Electronics and Electrical Engineering (AUTEEE)

作者： Jun Jiang Boxin Zhao Peng Zhang Yang Bai Xiaolong Chen Air force Engineering University Xi’an P.R. China Science and Technology on Aircraft Control Laboratory FACRI Xi’an Shaanxi China

ISBN: (纸本)9781538678626;9781538678619

Brain-computer interface (BCI) technology provides a new communication and control channel between the brain and a computer, without the participation of peripheral nerves and muscles. This paper proposed a brain-actuated BCI paradigm to control a humanoid robot. Because of the extremely low signal-to-noise ratio (SNR) of the electroencephalograph (EEG) signals, effective BCI paradigm for multiple degrees of freedom (DOF) control without external stimulation is hard to construct. To address this problem, a novel sequential coding method was presented in this paper to increase the number of output commands. With this method, different brain activities could be modulated using one motor imagery task only. A four-class BCI paradigm was designed based on the sequential coding method, and used to control a humanoid robot. Four subjects participate in the walking experiment of the robot. The average time cost to complete one walking task was 139.8 seconds. The experimental results demonstrated the effectiveness of the sequential coding method for multi-class BCI paradigm design.

关键词： Task analysis Legged locomotion Humanoid robots Electroencephalography Time factors Encoding

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Fault Tolerant control for Commercial aircraft with Actuator Faults and Amplitude Saturation

Fault Tolerant Control for Commercial Aircraft with Actuator...

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IEEE Chinese Guidance, Navigation and control Conference (CGNCC)

作者： Yishi Liu Liwei Sun Qingdong Li Xiwang Dong Zhang Ren School of Automation Science and Electronic Engineering Science and Technology on Aircraft Control Laboratory Beihang University Beijing P.R.china Shanghai Civil Aircraft Health Monitoring Engineering Technology Research Center Shanghai P.R.china

ISBN: (数字)9781538611715

ISBN: (纸本)9781538611722

In this paper, a constrained control scheme based on model reference adaptive control is investigated for longitudinal motions of a commercial aircraft with actuator faults and amplitude saturation. As presented, an adaptive law based on Lyapunov function is utilized to adjust the fault tolerant control law. Both additive and multiplicative faults are considered in the designed controller to deal with locked in place, loss of effectiveness, and bias actuator faults. Moreover, the basic controller and the fault tolerant controller adopt different techniques to anti-windup respectively for their diverse construction. Proofs for the stability of the two modified controllers which improve the performance of control system operating in the presence of actuator faults and amplitude saturation are proposed. Finally, a numerical example of the anti-windup fault tolerant controller for a commercial aircraft is demonstrated. The stability and performance improvements can be accrued with the presented fault tolerant control scheme.

关键词： Actuators aircraft Additives Aerospace control Fault tolerant systems Fault tolerant control

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