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2013 IEEE 11th International Conference on Electronic Measurement & Instruments

作者： Chen Xiaojun Hu Tao Wang Dandan Wu Huilan Beijing Institute of Astronautical Systems Engineering Harbin Institute of Technology Department of Automatic Measurement and Control

ISBN: (纸本)9781479907571

As to the real-time positioning demands for micro assembly process, this paper proposes a way which is based on Relevance Vector Machine Regression (RVMR). It solves the low efficiency problem which usually accompanies other common regression algorithms because the regression pattern is not sparse enough. This paper brings out grading RVMR, adopting the thought what is called "From coarse to fine". In this way, the number of training samples is greatly reduced while guaranteeing precision. So the off-line training efficiency is improved, meeting various parts in micro assembly process. In this algorithm, the algebra feature of the part image is extracted as the RVM's input, using Principal Component Analysis (PCA). Experiments on many regression algorithms and grading RVMR are both carried on. The results show that RVMR gets the shortest measuring time and the highest accuracy. The single axis estimation precision of part attitude is better than 0.5°.

关键词： Micro assembly, Attitude estimation, Relevance vector machine, Regression.

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Study of Low-Contrast Digital Meter Image Segmentation Algorithm

Study of Low-Contrast Digital Meter Image Segmentation Algor...

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2013 IEEE 11th International Conference on Electronic Measurement & Instruments

作者： Chen Xiaojun Hu Tao Wang Dandan Beijing Institute of Astronautical Systems Engineering Harbin Institute of Technology Department of Automatic Measurement and Control

ISBN: (纸本)9781479907571

During the digital recognition process of digital display instrument, if there is no lighting or light is weak, the recognition rate comes low because of poor image quality. As to this problem, this paper proposes a new algorithm for image segmentation. The algorithm uses the histogram equalization to improve image contrast and enhance gray difference between the background and the area to be identified. And then it positions display area coarsely using the adaptive region growing method. Finally, the display area is precisely positioned by projection method. And adaptive threshold segmentation is done in this area. The experimental results show that the algorithm can rapidly and accurately position the display area of digital display instrument. And segmentation effect of the positioned image is improved obviously, effectively simplifying the subsequent digital recognition algorithms and guaranteeing its recognition accuracy.

关键词： Digital meter, Numetical Recognition,Entropy threshold,Encode

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Preference-Inspired co-evolutionary algorithm using weights for many-objective optimization

Preference-Inspired co-evolutionary algorithm using weights ...

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15th Annual Conference on Genetic and Evolutionary Computation, GECCO 2013

作者： Wang, Rui Purshouse, Robin C. Fleming, Peter J. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

ISBN: (纸本)9781450319645

Decomposition based approaches are known to perform well on many-objective problems when a suitable set of weights is provided. However, providing a suitable set of weights a priori is difficult. This study proposes a novel algorithm: preference-inspired co-evolutionary algorithm using weights (PICEA-w), which co-evolves a set of weights with the usual population of candidate solutions during the search process. The co-evolution enables suitable sets of weights to be constructed along the optimization process, thus guiding the candidate solutions toward the Pareto optimal front. Experimental results show PICEA-w performs better than algorithms embedded with random or uniform weights.

关键词： Multiobjective optimization

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Evaluation of the spherical concave mirror and convex lens in compensating turbulence effect on FSO systems

Evaluation of the spherical concave mirror and convex lens i...

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International Symposium on Communication systems, Networks and Digital Signal Processing, CNSDSP

作者： M. Hulea Z. Ghassemlooy S. Rajbhandari X. Tang Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Romania Optical Communications Research Group Northumbria University Newcastle United Kingdom Department of Engineering Science University of Oxford United Kingdom Tsinghua University Beijing China

This paper focuses on evaluating the performance of two aperture averaging methods used for compensating the effects of the air turbulence in free space optical (FSO) communications. These methods are based on using a concentration lens and spherical concave mirrors (SCM). The preliminary experimental results show that the quality of the received signal in terms of the Q-factor and the scintillation index is moderately improved when employing a lens in comparison to SCM for all turbulence regimes. However, these results were obtained with different collection areas and focal points. Therefore, a more rigorous approach using lens and SCM with the same aperture diameters and focal lengths needs to be adopted to ensure conclusive results.

关键词： Laser beams Lenses Optical beams Apertures Optical fiber communication Mirrors Receivers

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Positive observer for continuous-time Takagi-Sugeno systems

Positive observer for continuous-time Takagi-Sugeno systems

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52nd IEEE Conference on Decision and control, CDC 2013

作者： Zaidi, Ines Tadeo, Fernando Chaabane, Mohamed Department of Systems Engineering and Automatic University of Valladolid Spain Department of Control of Industrial Processes University of Sfax Tunisia

ISBN: (纸本)9781467357173

This paper presents a positive observer design methodology for Takagi Sugeno systems with unmeasurable premise variables. For that, a positive Takagi-Sugeno observer is developed in order to estimate the system states and to guarantee the nonnegativity of the estimates at each time. Conditions are established in order to guarantee the convergence of the state error. These conditions are given as Linear Matrix Inequalities (LMIs) which makes possible to obtain the gains of the fuzzy observer. Finally, simulation results show the effectiveness of the proposed positive observer. © 2013 IEEE.

关键词： Linear matrix inequalities

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A dual decomposition algorithm for separable nonconvex optimization using the penalty function framework

A dual decomposition algorithm for separable nonconvex optim...

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52nd IEEE Conference on Decision and control, CDC 2013

作者： Dinh, Quoc Tran Necoara, Ion Diehl, Moritz KU Leuven Belgium Automatic Control and Systems Engineering Department University Politehnica Bucharest Romania EPFL Switzerland

ISBN: (纸本)9781467357173

We propose a dual decomposition method for solving separable nonconvex optimization problems that arise e.g. in distributed model predictive control over networks. We first derive a new sequential convex programming (SCP) scheme based on penalty function approach to handle nonconvexity. Then, we combine this SCP scheme with a dual decomposition algorithm to obtain a two-level decomposition algorithm. The global convergence of this algorithm is analyzed under standard assumptions. Some preliminary numerical results are also given to illustrate the theoretical results. © 2013 IEEE.

关键词： Convex optimization

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Linear model predictive control based on approximate optimal control inputs and constraint tightening

Linear model predictive control based on approximate optimal...

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52nd IEEE Conference on Decision and control, CDC 2013

作者： Necoara, Ion Nedelcu, Valentin Keviczky, Tamás Doan, Minh Dang De Schutter, Bart Automatic Control and Systems Engineering Department University Politehnica Bucharest Romania Delft Center for Systems and Control Delft University of Technology Netherlands Can Tho University of Technology Viet Nam

ISBN: (纸本)9781467357173

In this paper we propose a model predictive control scheme for discrete-time linear time-invariant systems based on inexact numerical optimization *** assume that the solution of the associated quadratic program produced by some numerical algorithm is possibly neither optimal nor feasible, but the algorithm is able to provide estimates on primal suboptimality and primal feasibility violation. By tightening the complicating constraints we can ensure the primal feasibility of the approximate solutions generated by the algorithm. Finally, we derive a control strategy that has the following properties: The constraints on the states and inputs are satisfied, asymptotic stability of the closed-loop system is guaranteed, and the number of iterations needed for a desired level of suboptimality can be determined. © 2013 IEEE.

关键词： Model predictive control

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A note on improvement of adaptive observer robustness

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IFAC Proceedings Volumes 2014年第3期47卷 558-562页

作者： Denis Efimov Christopher Edwards Ali Zolghadri Non-A team at Inria Lille Parc Scientifique de la Haute Borne 40 avenue Halley 59650 Villeneuve d'Ascq France College of Engineering Mathematics and Physical Sciences University of Exeter Exeter EX4 4QF UK University of Bordeaux IMS-lab Automatic control group 351 cours de la libération 33405 Talence France Department of Control Systems and Informatics National Research University ITMO 49 Kronverkskiy av. Saint Petersburg197101 Russia

In this paper the problem of adaptive observer design in the presence of disturbances is studied, and an augmented adaptive observer is proposed. First, the H ∞ gain of a conventional adaptive observer is estimated, which characterizes the effect of disturbances on output errors. Next, it is shown that if the disturbance is “matched” in the plant equations, then it is possible to introduce additional sliding-mode feedback, dependent on the plant output, improving the accuracy of observation. Simulation results confirm the improvement.

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Minimization of the Operation Costs of a Solar/Gas Airconditioning System Using Duration-based Predictive control

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Energy Procedia 2013年 42卷 784-793页

作者： Johanna Salazar Maria del Mar Castillo Francisco Rodriguez Fernando Tadeo Systems Engineering and Automatic Control Department University of Valladolid 47005 Valladolid Spain Automatic Control Electronics and Robotics Research Group University of Almería Ctra. Sacramento s/n 04120 Almería Spain

A proposal for the advanced control of a hybrid solar/gas air-conditioning system and its testing by simulation is presented. The proposal is based on a Predictive controller that optimizes the operational costs by taking into account the costs of gas heating and the electrical consumption. The Constrained Mixed-Integer Predictive control problem obtained is then solved using a formulation based on the duration of the states, which simplifies the numerical solution. The simulation at different times of the year is carried out in order to show the validity of the proposed approach

关键词： Climatic control Solar Climatization Predictive control

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Predictive control of a Renewable Energy Microgrid with Operational Cost Optimization

Predictive Control of a Renewable Energy Microgrid with Oper...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Johanna Salazar Fernando Tadeo Luis Valverde Systems Engineering and Automatic Control Dept. University of Valladolid Systems Engineering and Automatic Control Dept. University of Valladolid Thermal Engineering Group Energy Engineering Department School of Engineering

ISBN: (纸本)9781479902255

A proposal for optimal control of a microgrid powered by solar energy with mixed temporary storage based on a battery bank and hydrogen is presented and evaluated here by means of simulations. The proposal is based on a Predictive controller that optimizes the operational costs by taking into account the value of the energy generated, the cost of locally storing energy, the aging of the components and the operational constraints. The Constrained Mixed-Integer Predictive control problem obtained is then solved using a formulation based on the duration of the states, which simplifies the numerical solution. Some simulation results are presented to show the validity of the proposed approach.

关键词： Hybrid MPC Microgrid Renewable Hydrogen Power management Fuel cell Electrolyzer Metal hydride

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