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International Conference on Critical Infrastructures, CRIS

作者： Moustafa Chenine Iyad Al Khatib Jordan Ivanovski Volkan Maden Lars Nordström department of Industrial Information & Control Systems The Royal Institute of Technology (KTH) Stockholm SWEDEN Department of Signal Theory and Communications Polytechnic University of Catalonia (UPC) Barcelona Spain Solidux Telecom AB Stockholm Sweden Department of Industrial Information & Control Systems School of Electrical Engineering Royal Institute of Technology Stockholm Sweden Department of Industrial Information & Control Systems School of Electrical Engineering The Royal Institute of Technology (KTH) Stockholm SWEDEN

Phasor based Wide Area Monitoring and control (WAMC) systems are becoming a reality with increased research, development and deployments. Many potential control applications based on these systems are being proposed and researched. Such applications are either local applications using data from one or a few Phasor Measurement Units (PMUs) or centralized utilizing data from several PMUs. An aspect of these systems, which is less well researched, is the WAMC system dependence on high performance communication. This paper presents results of research on the use of Internet Protocol (IP) networks for both PMU and Remote Terminal Unit (RTU)/Intelligent Electronic Devices (IED) data for monitoring purposes. The paper examines performance aspects of the IP network Infrastructures when utilized by both: continuous PMU data streams and critical IED/RTU data. A set of simulation models characterizing a network of a Nordic Transmission System Operator were built to perform the analysis. The paper considers Quality of Service (QoS) strategies and the resulting delays and data loss that would be experienced.

关键词： Phasor measurement units Quality of service Protocols IP networks Delay Monitoring Substations

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Rendezvous and docking sensor and effector system design considerations for the lunar lander Altair

Rendezvous and docking sensor and effector system design con...

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AIAA Guidance, Navigation, and control Conference

作者： Sullivan, Jacob J. Lee, Allan Y. Grover, Myron R. GN and C Autonomous Flight Systems Branch Johnson Space Center Mail Code EG6 2101 NASA Parkway Houston TX 77058 United States Guidance Navigation and Control Section Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena CA 91109-8099 United States Guidance Navigation and Control System Altair Lunar Lander Mail Stop 230-104 United States Altair Lunar Lander Systems Engineering Section Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena CA 91109-8099 United States

ISBN: (纸本)9781600869624

One key function performed by the Guidance, Navigation, and control (GN&C) system of the lunar lander Altair is to rendezvous and dock with the Crew Exploration Vehicle named Orion, in both low Earth orbit and low lunar orbit. The rendezvous and docking process consists of a series of orbital maneuvers and spacecraft attitude controls that successively bring the active vehicle into the vicinity of, and eventually into contact with, the passive vehicle. This paper provides an overview of the rendezvous and docking performance of the Altair GN&C system. To this end, key rendezvous and docking requirements will first be described. These requirements drive the selections of the Altair GN&C sensors, attitude control effectors, and the rendezvous trajectory design. Measurements needed for the rendezvous and docking task will come from the star tracker, inertial measurement unit, docking camera, LIDAR, two-way S-band radiometric ranging data, as well as crew inputs. Measurements from these sensors will be used by the onboard control systems to control well-selected and well-placed Reaction control System (RCS) thrusters to achieve a safe docking. The final contact must be made with the docking axes of the mating vehicles well aligned, both translationally and angularly. Before a high-fidelity simulation test bed is made available, error budgeting is a cost-effective way to assess the docking capability of the Altair and Orion GN&C systems. In docking error budgeting, we first identified all key docking error sources (e.g., attitude control deadbands of mating vehicles, docking sensor measurement error, misalignment between docking sensor and docking mechanism, and others). Results of an error budget study provides the system engineers with a good estimate of whether the GN&C system can achieve the constraints imposed by the docking system. If the docking requirements cannot be met, the relevant error budgets will reveal the source(s) of the problem. Before a high-fidelity

关键词： Budget control

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Universality of weak selection

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Physical Review E 2010年第4期82卷 046106-046106页

作者： Bin Wu Philipp M. Altrock Long Wang Arne Traulsen Research Group Evolutionary Theory Max-Planck-Institute for Evolutionary Biology August-Thienemann-Str. 2 24306 Plön Germany Center for Systems and Control State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University Beijing 100871 China

Weak selection, which means a phenotype is slightly advantageous over another, is an important limiting case in evolutionary biology. Recently, it has been introduced into evolutionary game theory. In evolutionary game dynamics, the probability to be imitated or to reproduce depends on the performance in a game. The influence of the game on the stochastic dynamics in finite populations is governed by the intensity of selection. In many models of both unstructured and structured populations, a key assumption allowing analytical calculations is weak selection, which means that all individuals perform approximately equally well. In the weak selection limit many different microscopic evolutionary models have the same or similar properties. How universal is weak selection for those microscopic evolutionary processes? We answer this question by investigating the fixation probability and the average fixation time not only up to linear but also up to higher orders in selection intensity. We find universal higher order expansions, which allow a rescaling of the selection intensity. With this, we can identify specific models which violate (linear) weak selection results, such as the one-third rule of coordination games in finite but large populations.

关键词： Game theory

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A Robust Stabilization using State Feedback with Feedforward

A Robust Stabilization using State Feedback with Feedforward

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American control Conference

作者： Kumeresan A. Danapalasingam Anders la Cour-Harbo Girish Chowdhary Morten Bisgaard Section for Automation & Control Department of Electronic Systems Aalborg University 9220 Aalborg Denmark Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9781424474264

In a general nonlinear control system a stabilizing control strategy is often possible if complete information on external inputs affecting the system is available. Assuming that measurements of persistent disturbances are available it is shown that the existence of a smooth uniform control Lyapunov function implies the existence of a stabilizing state feedback with feedforward control which is robust with respect to measurement errors and external disturbances. Conversely, using differential inclusions parameterized as nonlinear systems with state and disturbance measurement errors, it is shown that there exists a smooth uniform control Lyapunov function if there is a robustly stabilizing state feedback with feedforward. This paper demonstrates that if there exists a smooth control Lyapunov function for a general nonlinear system with persistent disturbances for which one has previously designed a feedback controller, a feedforward always exists to be augmented for stability.

关键词： State feedback FEEDFORWARD Liapunov function Error measure external input FEEDFORWARD control There exists control strategy Stabilising

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Review of three Recent Books on the Boundary of Bioinformatics and systems Biology

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BioMedical engineering OnLine 2010年第1期9卷 1-4页

作者： Eric Bullinger Monica Schliemann Department of Electrical Engineering and Computer Science (Montefiore Institute) and GIGA (Interdisciplinary Cluster for Applied Geno-proteomics) Université de Liège Belgium Institute for Cell Biology and Immunology and Institute for Systems Theory and Automatic Control Universität Stuttgart Germany

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A Knowledge-Based Artificial Fish-Swarm Algorithm

A Knowledge-Based Artificial Fish-Swarm Algorithm

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IEEE International Conference on Computational Science and engineering, CSE

作者： X. Z. Gao Ying Wu Kai Zenger Xianlin Huang Department of Electrical Engineering Aalto University Espoo Finland Department of Automation and Systems Technology Aalto University Espoo Finland Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China

The Artificial Fish-swarm Algorithm (AFA) is an intelligent population-based optimization algorithm inspired by the behaviors of fish swarm. Unfortunately, it sometimes fails to maintain an appropriate balance between exploration and exploitation, and has a drawback of blind search. In this paper, a novel cultured AFA with the crossover operator, namely CAFAC, is proposed to enhance its optimization performance. The crossover operator utilized is to promote the diversification of the artificial fish and make them inherit their parents' characteristics. The Culture Algorithms (CA) is also combined with the AFA so that the blind search can be combated with. A total of 10 high-dimension and multi-peak functions are employed to investigate the optimization property of our CAFAC. Numerical simulation results demonstrate that the proposed CAFAC can indeed outperform the original AFA.

关键词： Marine animals Optimization Cultural differences Algorithm design and analysis Visualization Programming Protocols

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Efficiency of Steering Torque Recommendation in Limits of Driving Dynamics: An Empirical Study

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IFAC Proceedings Volumes 2010年第7期43卷 650-655页

作者： E. Mehrjerdian A. Gaedke R. Greul T. Bertram ZF Lenksysteme GmbH D-73529 Schwaebisch Gmuend Germany (Tel: +49/7171/31-4735 Institute of Control Theory and Systems Engineering Faculty of Electrical Engineering and Information Technology Technische Universität Dortmund D-44221 Dortmund Germany (Tel: +49/231/755-2670

The potential of controlled torque assistance in safety-related driving situations is investigated in more detail in this paper. For this purpose, a study of test persons was carried out in a real test vehicle in which an oversteer situation was reproducibly induced by activating a kick plate. Driver perception, driver response and vehicle reaction as a result of the activation were evaluated in different types of test with passive and active assistance function in each case. Driver perception was evaluated on the basis of subjective assessments by the test persons. Driver and vehicle response on the other hand were evaluated by analysing vehicle and steering signals. Results in the form of objective criteria are derived which enable the functionality to be evaluated in relation to the level of the assisting torque applied. As well as the holistic consideration of all driver reactions, the benefit of the function to individual drivers is also analysed. A detailed questionnaire was used to classify different driver types from the number of all test drivers, and used as a basis for analysing driver behaviour. Comparison of these responses with journeys carried out by a professional test driver enable conclusions to be drawn relating to the degree of significantly improved driver response to the recommendation.

关键词： driver assistance systems vehicle dynamics steering torque recommendation vehicle oversteering human factors in driver assistance empiric study in real vehicle

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Robust formation control for nonlinear mobile sensors in target tracking

Robust formation control for nonlinear mobile sensors in tar...

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2010第六届全国多智能体系统与控制学术年会

作者： Hu Jiangping Hong Yiguang Hu Xiaoming School of Automation Engineering University of Electronic Science and Technology of China 611731 Che Key Lab of Systems and Control Institute of Systems ScienceChinese Academy of SciencesBeijing 1001 0ptimization and Systems Theory and ACCESS Linnaeus Center Royal Institute of TechnologySE-100 44 S

Collaborative signal processing and sensor deployment have been among the most important research tasks in target tracking using networked *** this paper,a convergent nonlinear filter is constructed to track a target using mobile nonlinear scalar range *** robust formation control is proposed for the mobile sensor network to achieve a desired deployment to guarantee the nonlinear convergent ***,a numerical example is given to illustrate the proposed tracking algorithm.

关键词： Target tracking convergent nonlinear observer-based filter formation control mobile sensors

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Model reduction of homogeneous-in-the-state bilinear systems with input constraints

Model reduction of homogeneous-in-the-state bilinear systems...

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American control Conference

作者： I.J. Couchman E.C. Kerrigan C. Bohm Department of Electrical and Electronic Engineering and the Department of Aeronautics Imperial College London Exhibition Road London SW7 2AZ Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 70550 Stuttgart Germany

ISBN: (纸本)9781424474264

Homogeneous-in-the-state bilinear systems, appended by an additive disturbance, appear both from the discretization of some partial differential equations and from the bilinearization of certain nonlinear systems. They often have large state vectors that can be cumbersome for simulation and control system design. Our aim is to define a method, invariant to time transformations, for finding a reduced-order model with similar disturbance-output characteristics to those of the plant for all admissible input sequences. The inputs considered satisfy simple upper and lower bound constraints, representing saturating actuators. The approximation is based on a model truncation approach and a condition for the existence of such an approximation is given in terms of the feasibility of a set linear matrix inequalities. A novelty of our work is in the definition of a new Gramian for this class of system. Explicit error bounds on the scheme are included.

关键词： Reduced order systems Nonlinear systems Actuators Nonlinear control systems Large-scale systems Open loop systems Partial differential equations control system synthesis Linear matrix inequalities Additives

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An experimental and theoretical approach for the biogas steam reforming reaction

An experimental and theoretical approach for the biogas stea...

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作者： Avraam, D.G. Halkides, T.I. Liguras, D.K. Bereketidou, O.A. Goula, M.A. Prefecture Authority of Imathia Section of Town-Planning and Environment GR-59100 Veria Greece Technological Educational Institute of Western Macedonia Pollution Control Technologies Department GR-50100 Koila Kozani Greece HELBIO S.A. Hydrogen and Energy Production Systems Patras Science Park Stadiou Street Platani GR-26504 Rio Greece University of Western Macedonia Department of Mechanical Engineering Bakola and Sialvera GR-50100 Kozani Greece

An experimental and theoretical study for the biogas steam reforming reaction over 5%Ru/Al2O3 catalyst have been performed. An apparatus was constructed for the conduction of the experiments, the core of which was a tube reactor, filled with the catalyst in form of pellets. The inlet gas mixture consisted of CH4 and CO2 in various composition ratios as a model biogas and steam. A theoretical model of the process was developed. The experimental reactor was modelled as an isothermal pseudo homogeneous fixed bed reactor. Internal and external transport phenomena were neglected and appropriate effectiveness factors were employed instead. A physical properties model was used for the calculation of the physicochemical properties of the real mixture. Five reactant species, CH4, CO 2, H2O, CO and H2, were included in the model, whereas the feed consisted of the first three. Steam reforming and water gas shift were the main reactions. Experimental results and theoretical predictions match closely, stability of the catalyst was assured and an optimal operational window was identified, at GHSV = 10,000-20,000 h-1, T = 700-800 °C, CH4/CO2 = 1.0-1.5 and H2O/CH 4 = 3.0-5.0. © 2010 Published by Elsevier Ltd on behalf of Professor T. Nejat Veziroglu.

关键词： Catalysis

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