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Cloud manufacturing simulation platform for sintering production process control

Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS 2012年第7期18卷 1627-1636页

作者： Xiong, Yong-Hua Xu, Hu Wu, Min Lai, Xu-Zhi School of Information Science and Engineering Central South University Changsha 410083 China Hunan Engineering Laboratory for Advanced Control and Intelligent Automation Central South University Changsha 410083 China

To reduce the risk of field debugging and to improve the adaptability and reliability of actual automation systems, a simulation experiment platform based on cloud manufacturing was designed for sintering process of iron and steel manufacturing. Taking Programmable Logic controller(PLC) group, Distributed control System(DCS) group, server group and database group as physical resource layer, and taking various virtual control objects and optimization models of sintering processes as virtual resource layer, the cloud services such as semi physical simulation, operation parameter verification, produce process simulation and process study of sintering processes' optimal control system were provided by facing cloud access terminal users such as steel manufacturing enterprises, research and design institutions. The automatic material thickness control system in segregation feeding process of sintering production was taken as an example to verify the effectiveness of simulation experiment platform.

关键词： Optimal control systems

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Adaptive backstepping control of multi-model switching for the hydraulic servo position system of a rolling mill

Beijing Keji Daxue Xuebao/Journal of University of Science a...

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Beijing Keji Daxue Xuebao/Journal of University of science and Technology Beijing 2012年第11期34卷 1346-1351页

作者： Shao, Peng-Zhen Fang, Yi-Ming Wang, Wen-Bin Jiao, Zong-Xia Hebei Key Lab. of Industrial Computer Control Engineering Yanshan University Qinhuangdao 066004 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China

To deal with the structure jumping problem resulting from elastic load force and external load force jumping in different working conditions, an adaptive backstepping control method of multi-model switching was presented based on the common Lyapunov function method and the adaptive backstepping method. This approach combines the features of adaptive backstepping control and the design requirements of a common Lyapunov function, and the adaptive controller for every sub-system and the parameter adaptive estimators for the uncertainty upper bound are designed by backstepping control, then taking the Lyapunov function designed by backstepping as a common Lyapunov function to ensure that the system is asymptotically stable under arbitrary switching. It is easy to select the common Lyapunov function by the combination of backstepping and the common Lyapunov function method, and the problem of parameter jumping and parameter slow time-varying existing at the same time is solved. Simulation results demonstrate that the designed controllers can ensure not only good dynamic and static performance for the hydraulic servo position system of a rolling mill, but also good robustness for the system parameter jumping and parameter slow time-varying.

关键词： Backstepping

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Guaranteed cost control for discrete-time networked control systems with random Markov delays

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Journal of Systems engineering and Electronics 2011年第4期22卷 661-671页

作者： Li Qiu Bugong Xu Shanbin Li School of Automation Science and Engineering South China University of Technology Guangzhou 510640 E R. China College of Mechatroincs and Control Engineering Shenzhen University Shenzhen 518060 P. R. China

The guaranteed cost control for a class of uncertain discrete-time networked control systems with random delays is addressed. The sensor-to-controller （S-C） and contraller-to-actuator （C-A） random network-induced delays are modeled as two Markov chains. The focus is on the design of a two-mode-dependent guar- anteed cost controller, which depends on both the current S-C delay and the most recently available C-A delay. The resulting closed-loop systems are special jump linear systems. Sufficient conditions for existence of guaranteed cost controller and an upper bound of cost function are established based on stochastic Lyapunov-Krasovakii functions and linear matrix inequality （LMI） approach. A simulation example illustrates the effectiveness of the proposed method.

关键词： networked control systems （NCSs） guaranteed costcontrol random Markov delays linear matrix inequality （LMI）.

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Stochastic H_2 Optimal control of Discrete-Time Markov Jump Systems with Periodic Coefficients

Stochastic H_2 Optimal Control of Discrete-Time Markov Jump ...

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American control Conference

作者： Hongji Ma Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781457710957

In this paper, the H_2 optimal state-feedback control problem is investigated for discrete-time Markov jump systems subject to periodic coefficients and multiplicative noise. First of all, an exhaustive analysis is pursued to set up an H_2 performance criterion (H_2 norm), which can be characterized by the periodic solutions of two generalized Lyapunov equations. Based on the obtained H_2 norm, the H_2 optimal state-feedback controller is designed in terms of the stabilizing solution of a discrete-time generalized Riccati equation with periodic coefficients. Moreover, this stabilizing solution can be computed efficiently by the available iterative algorithm.

关键词： Markov processes Noise Educational institutions Riccati equations Optimal control

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Research on infrared object tracking based on SUKF and SIFT

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2012年第4期23卷 791-797页

作者： Zheng, Hong Zheng, Chen Yan, Xiu-Sheng Chen, Hai-Xia School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China Laboratory of Optical Information Technology Control and Security Yanjiao 065201 China

Aiming at the problems that accurate motion tracking of infrared object is hard in complex background by using a single algorithm, a new infrared object tracking method which combines scale unscented Kalman filter (SUKF) and scale invariant feature transform (SIFT) is proposed. Firstly, SUKF can estimate the state of unknown system, and the position of object center is located, and then the local detection area with SIFT feature is identified. Secondly, the features of object are obtained and matched by SIFT algorithm in this local area. Finally, the object center is accurately located by SIFT algorithm, and the state model of SUKF is updated and corrected by the final location. Compared with the related methods, the proposed tracking strategy based on SUKF-SIFT has better tracking results and real-time performance.

关键词： Kalman filters

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Passivity Analysis of Impulsive Complex Networks

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International Journal of automation and computing 2011年第4期8卷 484-489页

作者： Jin-Liang Wang Huai-Ning Wu Zhi-Chun gang Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing 100191 PRC College of Mathematics Science Chongqing Normal University Chongqing 400047 PRC

In this paper, we first investigate input passivity and output passivity for a class of impulsive complex networks with time-varying delays. By constructing suitable Lyapunov functionals, some input passivity and output passivity conditions are derived for the impulsive complex networks. Finally, an example is given to show the effectiveness of the proposed criteria.

关键词： Impulsive complex networks time-varying delays input passive output passive Lyapunov functional.

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System Identification model for an Intelligent Pneumatic Actuator (IPA) system

System Identification model for an Intelligent Pneumatic Act...

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2012 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Khairuddin Osman Ahmad 'Athif Mohd Faudzi M.F. Rahmat Nu'man Din Mustafa M. Asyraf Azman Koichi Suzumori Department of Industrial Electronics Faculty of Electrical and Electronics Universiti Teknikal Malaysia Melaka Durian Tunggal Malacca Malaysia Department of Mechatronics and Robotics Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Malaysia Department of Control Instrumentation and Automation Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Malaysia Graduate School of Natural Science and Technology Okayama University Okayama Japan

Intelligent Pneumatic Actuators (IPA) is a new generation of actuator for Research and Development (R&D). The purpose of this paper is to present the System Identification (SI) technique and procedure for the IPA system. System identification is used to obtain the mathematical model (transfer function) of the IPA system from the measured experimental data. Flow for the SI procedure starts with experimental setup, model structure selection, model estimation, model validation and finally testing with basic controller to prove the operation of IPA system. Auto Regressive with Exogenous Input (ARX) model is chosen as model structure of the system. Based on the input and output data of the system (model validation), best fit criterion and correlation analysis of the residual is analyzed to determine the adequate model to represent the IPA system. The result from SI model shows linear discrete model in order to obtain a discrete transfer function for the IPA system.

关键词： Analytical models Data models Silicon Mathematical model Actuators Robots Correlation

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Robust Hybrid control for Ballistic Missile Longitudinal Autopilot

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Chinese Journal of Aeronautics 2011年第6期24卷 777-788页

作者： WAEL Mohsen Ahmeda WAEL Mohsen Ahmed QUAN Quan Department of Automatic Control School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China

This paper investigates the boost phase＇s longitudinal autopilot of a ballistic missile equipped with thrust vector control. The existing longitudinal autopilot employs time-invariant passive resistor-inductor-capacitor （RLC） network compensator as a control strategy, which does not take into account the time-varying missile dynamics. This may cause the closed-loop system instability in the presence of large disturbance and dynamics uncertainty. Therefore, the existing controller should be redesigned to achieve more stable vehicle response. In this paper, based on gain-scheduling adaptive control strategy, two different types of optimal controllers are proposed. The first controller is gain-scheduled optimal tuning-proportional-integral-derivative （PID） with actuator constraints, which supplies better response but requires a priori knowledge of the system dynamics. Moreover, the controller has oscillatory response in the presence of dynamic uncertainty. Taking this into account, gain-scheduled optimal linear quadratic （LQ） in conjunction with optimal tuning-compensator offers the greatest scope for controller improvement in the presence of dynamic uncertainty and large disturbance. The latter controller is tested through various scenarios for the validated nonlinear dynamic flight model of the real ballistic missile system with autopilot exposed to external disturbances.

关键词： ballistic missiles attitude control gain-scheduling optimal tuning-control LQ optimal regulators

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Lane Keeping control for Autonomous 4WS4WD Vehicles Subject to Wheel Slip Constraint

Lane Keeping Control for Autonomous 4WS4WD Vehicles Subject ...

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American control Conference

作者： Changfang Chen Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecom-munications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781457710957

This paper proposes a robust control scheme that prevents an autonomous 4WS4WD vehicle from lane departure and wheel skidding in presence of road curvature and aerodynamic drag. The control objectives can be specified as various closed-loop specifications, such as lane keeping, wheel slip constraint and disturbance attenuation. An LMI approach is used to deal with these objectives simultaneously, which combines the quadratic stabilization technique with constraints on inputs. Simulation results show that the proposed controller effectively limits the combined wheel slip and improves the lane keeping performance.

关键词： Wheels Vehicles Roads Tires Friction Aerodynamics Vehicle dynamics

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A novel method of parameter identification of nonlinear electrohydraulic servo systems

A novel method of parameter identification of nonlinear elec...

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2011 International Conference on Fluid Power and Mechatronics, FPM 2011

作者： Zhao, Pan Wang, Shaoping Li, Xin Zhang, Boya Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing China

ISBN: (纸本)9781424484522

This paper presents a parameter identification method with nonlinear ordinary differential equation (ODE) model for electro-hydraulic servo systems (EHSS) based on Matlab toolbox, in which the values of known parameters are fixed and the values of unknown parameters are identified. In order to avoid the problem of over-parameterization, this paper divides the identification into two parts, i.e. no-load identification (identification of the system without load) and with-load identification (identification of the system with load). To test the performance of this method, it is applied to a set of simulated data. Identification results demonstrate perfect correspondence between the data and the identified models. © 2011 IEEE.

关键词： Ordinary differential equations

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