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2007 9th European control Conference, ECC 2007

作者： Martin-Romero, Juan Jose Gil-Martinez, Montserrat Garcia-Sanz, Mario Department of Electrical Engineering University of la Rioja Spain Department of Automatic Control and Computer Science Public University of Navarra Spain

ISBN: (纸本)9783952417386

This paper introduces a new analytical formulation to describe the robust performance and stability bounds for the quantitative feedback theory (QFT) controller design methodology. The new approach explicity defines a family of curves that allow the user to significantly reduce the computational effort and improves the accuracy of the design. The paper includes two examples to clarify and validate the analytical formulation. © 2007 EUCA.

关键词： Design

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Analytical formulation to compute QFT templates for plants with a high number of uncertain parameters

Analytical formulation to compute QFT templates for plants w...

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2007 Mediterranean Conference on control and Automation, MED

作者： Martín-Romero, Juan José Gil-Martínez, Montserrat García-Sanz, Mario Department of Electrical Engineering University of La Rioja Spain Department of Automatic Control and Computer Science Public University of Navarra Spain

ISBN: (纸本)142441282X

This paper introduces an analytical formulation to describe QFT templates based on Fourier series. This allows to calculate the template contour of plants with a high number of uncertain parameters. The proposed solution consists of performing operations between analytical subtemplates. This saves calculation time and allows to work with an infinite set of plant values. © 2007 IEEE.

关键词： Fourier series

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Hybrid heuristic and mathematical programming in oil pipelines networks: Use of immigrants

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2005年第1期6卷 9-19页

作者： DE LA CRUZ J.M HERRáN-GONZáLEZ A RISCO-MARTíN J.L ANDRéS-TORO B Department of Computer Architecture and Automatic Control Complutense University of Madrid 28040 Madrid SpainDepartment of Computer Architecture and Automatic Control Complutense University of Madrid 28040 Madrid SpainDepartment of Computer Science Engineering C.E.S. Felipe II (U.C.M.) 28300 Aranjuez SpainDepartment of Computer Architecture and Automatic Control Complutense University of Madrid 28040 Madrid Spain

We solve the problem of petroleum products distribution through oil pipelines networks. This problem is modelled and solved using two techniques: A heuristic method like a multiobjective evolutionary algorithm and Mathematical Programming. In the multiobjective evolutionary algorithm, several objective functions are defined to express the goals of the solutions as well as the preferences among them. Some constraints are included as hard objective functions and some are evaluated through a repairing function to avoid infeasible solutions. In the Mathematical Programming approach the multiobjective optimization is solved using the Constraint Method in Mixed Integer Linear Programming. Some constraints of the mathematical model are nonlinear, so they are linearized. The results obtained with both methods for one concrete network are presented. They are compared with a hybrid solution, where we use the results obtained by Mathematical Programming as the seed of the evolutionary algorithm.

关键词： MOEA MILP Hybrid algorithm Constraints

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Computing monotone policies for Markov decision processes: a nearly-isotonic penalty approach

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IFAC-PapersOnLine 2017年第1期50卷 8429-8434页

作者： Mattila R. Rojas C.R. Krishnamurthy V. Wahlberg B. Department of Automatic Control School of Electrical Engineering KTH Royal Institute of Technology Stockholm Sweden Department of Electrical and Computer Engineering Cornell University Cornell TechNY United States

This paper discusses algorithms for solving Markov decision processes (MDPs) that have monotone optimal policies. We propose a two-stage alternating convex optimization scheme that can accelerate the search for an optimal policy by exploiting the monotone property The first stage is a linear program formulated in terms of the joint state-action probabilities. The second stage is a regularized problem formulated in terms of the conditional probabilities of actions given states. The regularization uses techniques from nearly-isotonic regression. While a variety of iterative method can be used in the first formulation of the problem, we show in numerical simulations that, in particular, the alternating method of multipliers (ADMM) can be significantly accelerated using the regularization step. © 2017

关键词： alternating direction method of multipliers (ADMM) isotonic regression l1-regularization Markov decision process (MDP) monotone policy sparsity stochastic control

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Free Vibration of Braided Composite Plates with a Center Hole

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Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2017年第2期38卷 135-144页

作者： Tsai, Kun-Hsieh Hwan, Chung-Li Hwang, Jiann-Lih Lin, Meng-Ju Lo, Chih-Ching Department of Fiber and Composite Materials Feng-Chia University Taichung 407 Taiwan Department of Mechanical and Computer-Aided Engineering Feng-Chia University Taichung 407 Taiwan Department of Automatic Control Engineering Feng-Chia University Taichung 407 Taiwan

In this study, experiment and finite element analysis by software ANSYS are employed to explore the free vibration of braided composite plates, each with a center hole. First, the fiber volume fraction, braiding angle and density of braided composite plates, as well as the height-to-length ratio of a unit cell are measured. The equivalent engineering constants of the braided composite are then calculated by means of the stiffness averaging method. Secondly, the engineering constants calculated above, together with the measured density, are put into ANSYS to analyze the free vibration of the plates. Then vibration experiments of the braided composite plates are conducted, and the experimental results are used to validate the computed results. Finally, the effects that braid angle, fiber volume fraction, aspect ratio, along with the size and shape of holes have on the natural frequencies and vibration modes of our specimens are studied. © 2017, Chinese Mechanical engineering Society. All right reserved.

关键词： Natural frequencies

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Vision based compass for mobile robot orientation

Vision based compass for mobile robot orientation

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1993 Intelligent Vehicles Symposium, IV 1993

作者： Martinez, A.B. Climent, J. Planas, R.M. Asensio, J.M. Automatic Control and Computer Engineering Department Universitat Politecnica de Catalunya Pau Gargallo 5 Barcelona08028 Spain

ISBN: (纸本)0780313704

This paper presents a vision system that can be used as a robot's visual compass in indoors environments. The robot uses a zenithal-looking camera. From the image so obtained the vision system is able to obtain the deviation in orientation from an initial one. Observing ceilings, it can be seen that there are many straight lines (beams, water pipes, electrical wires, air conditioning systems, etc). Many of these ceilings also present repetitive textures such as grids, mosaics, longitudinal lines, metallic nets, etc. To detect the straight lines a 6x6 window is used to convolve the input image in real time. The window coefficients are dynamically changed with the robot orientation. The effect achieved with these sets of coefficients is equivalent to pass a rotated window over the image. © 1993 IEEE.

关键词： Textures

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Design of a neural network observer to control a FED-batch bioprocess

Design of a neural network observer to control a FED-batch b...

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1999 European control Conference, ECC 1999

作者： Boutalis, Y.S. Kosmidou, O.I. Automatic Control Systems Laboratory Department of Electrical and Computer Engineering Democritus University of Thrace XanthiGR-67100 Greece

ISBN: (纸本)9783952417355

The present paper deals with the production of Saccharomyces cerevisiae, described by a sixth order nonlinear state space model. The control objective is to ensure the process stability and desirable specifications in the presence of disturbances and lack of reliable state measurements. First, the model of the process and its properties are presented. Next the ability of multi-layer Neural Networks to act as reliable emulators of the system dynamics is tested by simulation results and a training strategy is proposed to improve their performance. Finally, a non-linear adaptive observer is designed by means of artificial neural networks. © 1999 EUCA.

关键词： Neural networks

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CICLIC: A tool to generate feasible cyclic schedules

CICLIC: A tool to generate feasible cyclic schedules

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WFCS 2006: 2006 IEEE International Workshop on Factory Communication Systems

作者： Yépez, José Guardia, Josep Velasco, Manei Ayza, Jordi Castañé, Rosa Martí, Pau Fuertes, Josep M. Automatic Control and Computer Engineering Department Technical University of Catalonia C/Pau Gargallo 5 08028 Barcelona Spain

ISBN: (纸本)1424403790

A common way of implementing periodic real-time systems is by means of a cyclic scheduler. This method of scheduler is characterized by having a high degree of determinism, a high degree of predictability, a high degree of reliability, and implementation simplicity. Also, it is a very well-known method broadly used in industrial environments. The main problem this type of scheduler may have is the lack of flexibility, since any change in the group of tasks or in its temporary characteristics forces it to do repeat the execution plan. In solving these problems, it is necessary, and most of the time, essential, to have tools that may help system designers to create a cyclic scheduler automatically. In this paper, a tool having this function, and named CICLIC is described. The design mechanism is based on algorithms of exhaustive search that use heuristic rules in optimizing searching paths. To illustrate the use of CICLIC some examples are shown. © 2006 IEEE.

关键词： Real time systems

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Event-triggered leader-following formation control for multi-agent systems under communication faults: application to a fleet of unmanned aerial vehicles

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Journal of Systems engineering and Electronics 2021年第5期32卷 1014-1022页

作者： VAZQUEZ TREJO Juan Antonio GUENARD Adrien ADAM-MEDINA Manuel PONSART Jean-Christophe CIARLETTA Laurent ROTONDO Damiano THEILLIOL Didier Research Center for Automatic Control of Nancy University of LorraineNancy F-54000France Electronic Engineering Department National Institute of Technology of MexicoCuernavaca Morelos 62490Mexico Lorraine Research Laboratory in Computer Science and Its Applications University of LorraineNancy F-54000France University of Stavanger Department of Electrical and Computer EngineeringStavanger 4021Norway

The main contribution of this paper is the design of an event-triggered formation control for leader-following consensus in second-order multi-agent systems(MASs)under communication *** the agents must follow the trajectories of a virtual leader despite communication faults considered as smooth time-varying delays dependent on the distance between the *** matrix inequalities(LMIs)-based conditions are obtained to synthesize a controller gain that guarantees stability of the synchronization *** on the closed-loop system,an event-triggered mechanism is designed to reduce the control law update and information exchange in order to reduce energy *** proposed approach is implemented in a real platform of a fleet of unmanned aerial vehicles(UAVs)under communication faults.A comparison between a state-of-the-art technique and the proposed technique has been provided,demonstrating the performance improvement brought by the proposed approach.

关键词： event-triggered leader-following consensus communication fault formation control unmanned aerial vehicle(UAV) experimental result

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On the conceptualization of total disturbance and its profound implications

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Science China(Information Sciences) 2020年第2期63卷 221-223页

作者： Sen CHEN Wenyan BAI Yu HU Yi HUANG Zhiqiang GAO Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences Beijing Aerospace Automatic Control Institute Center for Advanced Control Technologies Department of Electrical Engineering and Computer ScienceCleveland State University

Dear editor,How to deal with uncertainties and/or disturbances is a central issue pushing the development of both control science and control technology. Among various approaches, the active disturbance rejection control (ADRC) has been successfully implemented in various industrial practices because of its uniqueness in concepts, simplicity

关键词： ESO On the conceptualization of total disturbance and its profound implications

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