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作者： Zhang, Chunmei Chen, Jie Xin, Bin Cai, Tao Chen, Chen School of Automation Beijing Institute of Technology Beijing China Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing China School of Electronic Information Engineering Taiyuan University of Science and Technology Shanxi China Department of Automation Tsinghua University Beijing China

ISBN: (纸本)9788995605646

Differential Evolution (DE) is a simple and efficient numerical optimization method. Most DE variants in the literature adopt fixed population size. This paper incorporates into DE the mechanisms of lifetime and extinction which regulate DE's population size in an adaptive manner. The population size is adjusted according to the online progress of fitness improvement. Two schemes of inserting new individuals are proposed to match different mechanisms respectively. The performance of these innovations is examined through the optimization of benchmark problems. The results show that the proposed adaptive population sizing strategy is efficient for improving the convergence and efficiency of the DE. © 2011 Asian control Association.

关键词： Optimization

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Stability analysis of the Acrobot walking with observed geometry

Stability analysis of the Acrobot walking with observed geom...

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作者： Anderle, Milan Čelikovský, Sergej Czech Technical University in Prague Faculty of Electrical Engineering Department of Control Engineering Technická 2 166 27 Prague Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic Pod Vodárenskou věží 4 182 08 Prague Czech Republic

ISBN: (纸本)9783902661937

This paper aims to extend of the previously developed analytical design for the Acrobot walking. The corresponding state feedback controller is completed in this paper by an observer to estimate some states of the Acrobot. Both the controller and the observer are based on the partial exact feedback linearization of order 3. The feedback controller and the observer are extended for the tracking of the cyclic walking-like trajectory in order to demonstrate the cyclic Acrobot walking. The cyclic walking-like trajectory starts continuous phase from certain initial conditions, that at the end of the step makes an impact and after the impact it reaches the same initial conditions as at the beginning of the step. This cyclic motion of the Acrobot enable us to prove the stability of the feedback tracking with the observer numericaly by the method of Poincaré mappings. This numerical proof of the stability is supported by numerical simulations showing practically unlimited number of steps of the stable Acrobot walking. © 2011 IFAC.

关键词： Stability

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Feedback design for the Acrobot walking-like trajectory tracking and computational test of its exponential stability

Feedback design for the Acrobot walking-like trajectory trac...

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1st Joint Symposium on Computer-Aided control System Design, CACSD 2011 and Systems with Uncertainty, SU 2011

ISBN: (纸本)9781457710667

This paper aims to the further improve of the previously developed design for the Acrobot walking based on the partial exact feedback linearization of order 3. Namely, such an exact system transformation leads to an almost linear system where error dynamics along trajectory to be tracked is a 4 dimensional linear time varying system having 3 time varying entries only. Unlike previous approaches treating time varying entries as uncertainties with various extent of conservatism, the present paper takes into the account an information about these time varying functions including their derivatives up to order 4. Using that, the time varying state and the feedback transformation enable to design a fundamental matrix of the error dynamics in an explicit form and pre-designed stability properties. In particular, product of that fundamental matrix at the end of the single support walking phase by the impact map Jacobian enables directly prove stability of the hybrid cyclic walking like trajectory by computing certain 44 matrix and determining numerically whether its eigenvalues lie within the unit circle. This combination of analytical and numerical computations provides the justification of the exponential stability of the walking-like trajectory tracking. Moreover, it is supported by numerical simulations showing practically unlimited number of steps of the Acrobot "walking". © 2011 IEEE.

关键词： Trajectories

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A Complementary Modularized Ramp Metering Approach Based on Iterative Learning control and ALINEA

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IEEE Transactions on Intelligent Transportation Systems 2011年第4期12卷 1305-1318页

作者： Zhongsheng Hou Xin Xu Jingwen Yan Jian-Xin Xu Gang Xiong Advanced Control Systems Laboratory School of Electronic and Information Engineering Beijing Jiaotong University BJTU Beijing China Institute of Automation College of Mechatronics and Automation National University of Defense Technology Changsha China Department of Electrical and Computer Engineering National University of Singapore Singapore Automation Institute Chinese Academy of Sciences (CAS) Beijing China

Ramp metering is an effective tool for traffic management on freeway networks. In this paper, we apply iterative learning control (ILC) to address ramp metering in a macroscopic-level freeway environment. By formulating the original ramp metering problem as an output regulating and disturbance rejection problem, ILC has been applied to control the traffic response. The learning mechanism is further combined with Asservissement Linéaire d'Entrée Autoroutière (ALINEA) in a complementary manner to achieve the desired control performance. The ILC-based ramp metering strategy and the modified modularized ramp metering approach based on ILC and ALINEA in the presence of input constraints are also analyzed to highlight the advantages and the robustness of the proposed methods. Extensive simulations are given to verify the effectiveness of the proposed approaches.

关键词： Traffic control Mathematical model Convergence Learning systems Feedforward neural networks

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Assembly and fabrication of single-wall carbon nanotube field effect transistor using dielectrophoresis method

Assembly and fabrication of single-wall carbon nanotube fiel...

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9th Chinese International Nanoscience and Technology Symposium and the Nano-Products Exposition

作者： Xu, Ke Dong, Zaili Tian, Xiaojun Liu, Jian Wu, Chengdong State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China School of Information and Control Engineering Shenyang Jianzhu University Shenyang 110168 China

On account of their sizes and unique properties, single-wall carbon nanotubes are candidates for a number of building blocks in nanoscale electronics. With respect to the assembly of carbon nanotube field effect transistor, the dielectrophoresis technology is adopted, which assembles SWCNTs between the microelectrodes, SWCNTs are affected by the electrophoretic force which is carried out by the related theoretical analysis in a nonuniform electric field. The driving electric field of dielectrophoresis is simulated by the comsol software. According to the simulation results, a number of the experiments are done. The applied alternating current voltage has a frequency of 2MHzand an amplitude of 10 V. It turns out that the required experimental parameters of the efficient assembly of SWCNT are obtained. AFM scanning and electrical properties of SWCNTs show that the method can achieve the effective assembly of carbon nanotube field effect transistor. SWCNTs are driven in the microelectrode gap, having a good arrangement of uniform orientation and assembly results, and proportional to the arrangement density along the electrode width direction and the duration of DEP. As a result, it also provides an effective method of assembly and fabrication for other one-dimensional nanomaterials assembly of nanoelectronic devices. Copyright © Taylor & Francis Group, LLC.

关键词： Electrophoresis

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Practical and robust control for precision positioning systems

Practical and robust control for precision positioning syste...

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IEEE International Conference on Mechatronics

作者： Chong, Shin-Horng Sato, Kaiji Department of Control Instrumentation and Automation Universiti Teknikal Malaysia Melaka Hang Tuah Jaya 76100 Durian Tunggal Malaysia Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology 4259 Nagatsuta Midori-ku Yokohama 226-8502 Japan

ISBN: (纸本)9781612849836

This paper presents a practical and improved practical controller for enhancing precision motion performance. For practical use, high motion control performance, ease of design and controller adjustment are desired. A nominal characteristic trajectory following (NCTF) control has been studied to realize high performance and ease of application. The NCTF controller consists of a nominal characteristic trajectory (NCT) which is the reference motion of a control system and determined from experimental open-loop time responses of the mechanism and a compensator which makes the motion of the controlled object to follow NCT. The controller parameters can be determined easily, without any given model parameters. In the present paper, the Acceleration-Reference - Continuous Motion (AR-CM) NCTF controller has been proposed and implemented. The AR-CM NCTF considers the acceleration reference for object motion as additional controller elements besides the velocity reference. The AR-CM NCTF controller provides the advantage of high overshoot reduction and disturbance reduction characteristics. This paper then highlights how robustness the controller in the precision positioning systems. The issues considered include (i) variation of mass object;(ii) variation of disturbance force such as coulomb and viscosity frictions. The design procedure of the AR-CM NCTF controller remains easy, practical and is independent of friction characteristics. Validation and implementation of the AR-CM NCTF controller with a mechanism with friction are carried out in order to confirm its effectiveness. The robustness of the AR-CM NCTF controller is examined by comparing its motion performance with the PDDO (PD + disturbance observer) controllers. The comparative experimental results illustrate the achievable performance of the AR-CM NCTF controller in positioning and tracking control and the higher robustness to plant parameter variations, as compared to the PDDO controllers. © 2011 IEEE.

关键词： controllers

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Mass action realizations of reaction kinetic system models on various time scales

Mass action realizations of reaction kinetic system models o...

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作者： Hangos, K.M. Szederkényi, G. Process Control Research Group Computer and Automation Reseach Institute Kende u. 13-17 Budapest H-1111 Hungary Department of Electrical Engineering and Information Systems University of Pannonia Egyetem u. 10 Veszprém Hungary

Complex chemical reaction networks often exhibit different dynamic behaviour on different time scales. A combined approach is proposed in this work for determining physically meaningful mass action realizations of complex chemical reaction networks that describe its dynamic behaviour on different time scales. This is achieved by appropriately reducing the detailed overall mass action kinetic scheme using quasi steady state assumptions fit to the particular time scale, and then searching for an optimal realization using mixed integer linear programing. Furthermore, the relationship between the properties (reversibility, deficiency, stability) of the obtained realizations of the same system on different time scales are also investigated and related to the same properties of the detailed overall model. It is shown that the reduced models obtained by quasi steady state assumptions may show exotic nonlinear behaviour, such as oscillations, when the original detailed is globally asymptotically stable. The proposed methods are illustrated by using a simple Michaelis-Menten type reaction kinetic example. The simplified versions of the well known Brusselator model have also been investigated and presented as a case study. © Published under licence by IOP Publishing Ltd.

关键词： Reaction kinetics

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Clique discovery based on user similarity for online shopping recommendation

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Information Technology Journal 2011年第8期10卷 1587-1593页

作者： Yang, Qing Zhou, Ping Zhang, Huibing Zhang, Jingwei Electronic Engineering and Automation Institute Guilin University of Electronic Technology Guilin 541004 China Computer and Control Institute Guilin University of Electronic Technology Guilin 541004 China

Identifying cliques with the same interests is valuable for online shopping which can make the recommendation and advertisements to target different users more accurately and maximize the benefits of advertisers, publishers and users. This study, has proposed an effective and efficient method to discover cliques for online shopping which firstly identifies clique leaders and clusters the most similar users, then computes clique cores among existing clique members and finally generates the complete cliques. A marked improvement is that two key factors, users' behavioral characteristics and regular purchase information, are unified to discover cliques. This method can also remove effectively most of fake purchases through computing the operation similarity among different goods categories. © 2011 Asian Network for Scientific Information.

关键词： Clique core Clique discovery Clique leader Online recommendation

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Robust H∞ control of switched uncertain time-varying delay discrete-time systems via dynamic output feedback

Robust H∞ control of switched uncertain time-varying delay ...

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7th International Conference on Electrical and Electronics engineering, ELECO 2011

作者： Song, Zhengui Dimirkovsky, Gyorgyi Zhao, Jun Institute of Integrated Process Automation College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Departments of Computer Eng. and Control Eng. Faculty of Engineering Dogus University Acibadem Zeamet Sokak 21 Kadikoy TR-34722 Istanbul Turkey Institute of Automation and Systems Eng. Faculty of Electrical Eng. and Info. Technologies SS Cyril and Methodius University Karpos 2 BB MK-1000 Skopje Macedonia

ISBN: (纸本)9786050102048

Robust H∞ output feedback control problem for a class of switched linear discrete-time systems possessing norm-bounded uncertainty and time-varying delay is investigated. A switched dynamic output feedback controller is sought that can robust exponentially stabilize and reduce to a prescribed level the effect of disturbance input on the controlled output in the closed loop. A delay-dependent linear matrix inequality based sufficient condition for the problem to be solvable is derived via the switched Lyapunov functions. controller design is performed by solving a set of linear matrix inequalities. An illustrative example along with simulation results is given to demonstrate the validity of these novel derivations. © 2011 Chamber of Turkish Electric.

关键词： Linear matrix inequalities

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Sliding mode control of switched uncertain linear systems: Designing robust H∞ sliding surface

Sliding mode control of switched uncertain linear systems: D...

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7th International Conference on Electrical and Electronics engineering, ELECO 2011

作者： Lian, Jie Dimirkovsky, Gyorgyi Zhao, Jun Institute of Integrated Process Automation College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Departments of Computer Eng. and Control Eng. Faculty of Engineering Dogus University Acibadem Zeamet Sokak 21 Kadikoy TR-34722 Istanbul Turkey Institute of Automation and Systems Eng. Faculty of Electrical Eng. and Info. Technologies SS Cyril and Methodius University Karpos 2 BB MK-1000 Skopje Macedonia

ISBN: (纸本)9786050102048

The robust H∞ control problem for a class of uncertain switched linear systems by using the variable structure control is investigated. A robust H∞ single sliding surface is shown to exist as long as a convex combination of the subsystems of the switched system is robustly stabilizable with disturbance attenuation level γ. A switching law is constructed via the single Lyapunov function technique. Variable structure controllers of subsystems are designed so as the resulting closed-loop system guarantees the robust H∞ performance. An illustrative example and simulation results are given to demonstrate the effectiveness of the proposed design method. © 2011 Chamber of Turkish Electric.

关键词： Sliding mode control

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