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Lecture Notes in Electrical engineering 2014年 325卷 201-215页

作者： Nayl, Thaker Nikolakopoulos, George Gustafsson, Thomas Automatic Control Group Department of Computer Science Electrical and Space Engineering Luleå University of Technology Luleå97187 Sweden

This article proposes a novel real time bug like algorithm for performing a dynamic smooth path planning scheme for an articulated vehicle under limited and sensory reconstructed surrounding static environment. In the general case, collision avoidance techniques can be performed by altering the articulated steering angle to drive the front and rear parts of the articulated vehicle away from the obstacles. In the presented approach factors such as the real dynamics of the articulated vehicle, the initial and the goal configuration (displacement and orientation), minimum and total travel distance between the current and the goal points, and the geometry of the operational space are taken under consideration to calculate the update on the future way points for the articulated vehicle. In the sequel the produced path planning is iteratively smoothed online by the utilization of Bezier lines before producing the necessary rate of change for the vehicle’s articulated angle. The efficiency of the proposed scheme is being evaluated by multiple simulation studies that simulate the movement of the articulated vehicle in open and constrained spaces with the existence of multiple obstacles. © Springer International Publishing Switzerland 2014.

关键词： Motion planning

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Stabilizing Submanifolds with Passive Input-Output Relations

Stabilizing Submanifolds with Passive Input-Output Relations

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IEEE Annual Conference on Decision and control

作者： Jan Maximilian Montenbruck Murat Arcak Frank Allgower Department of Electrical Engineering and Computer Sciences University of California at Berkeley Institute for Systems Theory and Automatic Control University of Stuttgart

ISBN: (纸本)9781479978878

We study submanifold stabilization problems from an input-output perspective. For doing so, we consider feedback interconnections of relations of signals whose squared distance to a given submanifold has finite integral. In our framework, output feedback passivity of the feedforward relation and input strict passivity of the feedback relation with sufficiently large excess of passivity, both with respect to the integral squared distance of their signals to the submanifold under consideration, is sufficient for submanifold stabilization. We show that the distance of the signals in the feedback interconnection to the submanifold remains bounded for bounded exogenous inputs, thus extending the feedback theorem for passive systems to submanifold stabilization problems.

关键词： Integral equations Aerospace electronics Output feedback Synchronization Sections Conferences Feedforward neural networks

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Dependence of ESD charge voltage on humidity in data centers: Part I - Test methods

Dependence of ESD charge voltage on humidity in data centers...

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2015 ASHRAE Winter Conference

作者： Talebzadeh, Atieh Moradian, Mahdi Han, Yunan Patnaik, Abhishek Swenson, David E. Pommerenke, David Department of Electrical and Computer Engineering Electromagnetic Compatibility Laboratory Missouri University of Science and Technology RollaMO United States Department of Electrical and Computer Engineering Missouri University of Science and Technology RollaMO United States School of Information Science and Technology Beijing University of Chemical Technology Beijing China Affinity Static Control Consulting LLC Round RockTX United States

ISBN: (纸本)9781936504961

The effect of absolute and relative humidity on the charge generated in the human body during different human activities was investigated. Environmental conditions were varied between a relative humidity of 8% to 45% in a temperature range of 5°C to 38°C (41°F to 100.4°F);additionally, a wide range of footwear and flooring types were considered. The human activities studied included well-defined walking, random walking and scraping feet, taking off a sweater and dropping it, and standing up from a chair. The first part of this three-part paper mainly describes the test and data analysis methodology. One conclusion based on the voltages generated across different footwear and flooring combinations is that charge generation depends on the particular activity and associated materials. However, low relative humidity and a low, but not very low, dew point in general produce conditions favorable for high-voltage generation. Of all of the experiments performed, standing up from a chair yielded the highest body voltage. Two other parts of the three-part paper present a detailed analysis. © 2015 ASHRAE.

关键词： Floors

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Decentralized optimal control of inter-area oscillations in bulk power systems

Decentralized optimal control of inter-area oscillations in ...

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IEEE Annual Conference on Decision and control

作者： Xiaofan Wu Florian Dorfler Mihailo R. Jovanovic Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN 55455 Automatic Control Laboratory at ETH Zurich Switzerland

ISBN: (纸本)9781479978878

In bulk power systems, spectral analysis of poorly damped modes is commonly used for identifying local and interarea oscillations. Conventionally, these oscillations are mitigated by carefully tuned decentralized controllers. In this paper, we depart from the modal perspective and employ non-modal tools to analyze and control inter-area oscillations. Our input-output analysis examines power spectral density and variance amplification of stochastically forced systems and offers new insights relative to modal approaches. To improve upon the limitations of conventional wide-area control strategies, we also study the problem of signal selection and optimal design of sparse and block-sparse wide-area controllers. In our approach, we preserve rotational symmetry of the power network by allowing only relative angle measurements in the distributed controllers. We examine performance tradeoffs and robustness of sparse and block-sparse control architectures by studying the NETS-NYPS test system, and show that optimal retuning of fully-decentralized controllers can effectively guard against local and inter-area oscillations.

关键词： Optimal control bulk power system controllers Power grids power systems Signal selection Decentralized Rotational symmetry Angle measurement Input output analysis

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Towards an emotional agent architecture for practical reasoning

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical engineering 2014年第1期76卷 145-156页

作者： PuicǍ, Mihaela-Alexandra Department of Computer Science Faculty of Automatic Control and Computers University Politehnica of Bucharest Romania

Agents aimed at accomplishing task specific goals require reasoning and learning capabilities;their internal architecture is built using artificial intelli- gence techniques like problem solving, knowledge representation or planning. But agents aimed at interacting with human users are expected to know more than that: they need to show believable behavior and social abilities. Emotions, with their influence on behavior and cognitive processes, are able to provide the required abilities. We believe that modeling human emotional mechanisms as faithfully as possible makes an agent suitable for performing in a human-agent interaction en- vironment. In this paper we present such an architecture, which aims at modeling the human affective mechanisms of primary and secondary emotions, personality and resource usage. The agent is integrated in a human-agent interaction sce- nario, showing how its affect infuences its behavior and the activities during a lesson in an e-learning system.

关键词： Knowledge representation

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Simulation of control algorithm for active reduction of transversal vibrations of beams by piezoelectric elements based on identification of bending moment

Simulation of control algorithm for active reduction of tran...

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作者： Kozień, M.S. ͆cislo, L. Cracow University of Technology Faculty of Mechanical Engineering Institute of Applied Mechanics Al. Jana Pawla II 37 Kraków31-864 Poland Cracow University of Technology Faculty of Electrical and Computer Engineering Department of Automatic Control and IT Warszawska 24 Kraków30-155 Poland

Application of piezoelectric elements to active reduction of bending vibrations of the beams is known well in the literature. During vibrations, an external excitation may vary in the time domain, including its form in the frequency domain. It should have influence on their response. The problem of proper selection of the control parameter in the control algorithm used to reduce vibrations arises. In the article, simulations of a control algorithm based on detection of bending moment are analytically tested. The solution for the transient type of vibrations are obtained by the finite difference method (FDM). Analysis for two separated natural modes was performed. The analysis shows the possibility to design a control algorithm based on detection of the bending moment.

关键词： Bending moments

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Identifiability and Parameter Estimation of Linear Continuous-time Systems under Irregular and Random Sampling

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IFAC-PapersOnLine 2015年第28期48卷 332-337页

作者： Mu, Biqiang Guo, Jin Wang, Le Yi Yin, George Xu, Lijian Zheng, Wei Xing Key Laboratory of Systems and Control Chinese Academy of Sciences Beijing100190 China School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing100083 China Department of Electrical and Computer Engineering Wayne State University DetroitMI48202 United States Department of Mathematics Wayne State University DetroitMI48202 United States Department of Electrical and Computer Engineering Technology Farmingdale State College State University of New York FarmingdaleNY11735 United States School of Computing Engineering and Mathematics University of Western Sydney PenrithNSW2751 Australia

This paper considers the problem of identifiability and parameter estimation of single-input-single-output, linear, time-invariant, stable, continuous-time systems under irregular and random sampling schemes. Conditions for system identifiability are established under inputs of exponential polynomial types and a tight bound on sampling density. Identification algorithms of Gauss-Newton iterative types are developed to generate convergent estimate sequences. When the sampled output is corrupted by observation noises, input design, sampling times, and convergent algorithms are intertwined. Persistent excitation (PE) conditions for strongly convergent algorithms are derived. Unlike the traditional identification, the PE conditions under irregular and random sampling involve both sampling times and input values. Under the given PE conditions, iterative and recursive algorithms are developed to estimate the original continuous-time system parameters. The corresponding convergence results are obtained. Several simulation examples are displayed to verify the theoretical results. © 2015

关键词： Continuous time systems Iterative methods Lyapunov methods Nonlinear control systems Parameter estimation Sampling convergence and asymptotical normality Estimation algorithm Identifiability Irregular sampling Linear continuous time system Non linear least squares

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Extended spatial evolutionary games and induced bystander effect

Advances in Intelligent Systems and Computing

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Advances in Intelligent Systems and Computing 2014年 283卷 337-348页

作者： Krześlak, Michal Świerniak, Andrzej Silesian University of Technology Electronics and Computer Science Department of Automatic Control Gliwice Poland

The main goal of the study is modelling of radiation induced bystander effect using evolutionary game theory. A payoff table for three different phenotypes (game-theoretic strategies) contains: costs/profits of bystander effect, choice of apoptotic pathway, producing growth factors and resistance against bystander effect. Games are played on a lattice and for that purpose two kinds of spatial evolutionary games are presented and compared. Moreover different polymorphic equilibrium points dependent on model parameters and cells reproductions are discussed. © Springer International Publishing Switzerland 2014

关键词： Cellular automata

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Corrections to "Efficient Adaptive Turbo Equalization for Multiple-Input–Multiple-Output Underwater Acoustic Communications" [W. Duan, J. Tao, and Y. Rosa Zheng, IEEE J. Ocean. Eng ., 2017, DOI: 10.1109/JOE.2017.2707285]

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IEEE Journal of Oceanic engineering 2017年第3期42卷 752-752页

作者： W. Duan J. Tao Y. R. Zheng Qualcomm Technologies Inc. San Diego CA USA Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO USA Key Laboratory of Underwater Acoustic Signal Processing of Ministry of Education Southeast University Nanjing China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China

Equation In [1], (6) of the above named work is corrected.

关键词： MIMO Adaptive equalizers Underwater communication Underwater acoustics Least mean squares methods

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DuQuad: a toolbox for solving convex quadratic programs using dual (augmented) first order algorithms

DuQuad: a toolbox for solving convex quadratic programs usin...

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IEEE Annual Conference on Decision and control

作者： Ion Necoara Sverre Kvamme Automatic Control and Systems Engineering Department University Politehnica Bucharest Romania Department of Engineering Cybernetics Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)9781479978878

In this paper we present the toolbox DuQuad specialized for solving general convex quadratic problems arising in many engineering applications (e.g. embedded predictive control problems). Several versions of dual first order methods are implemented in the programming language C, and optimized for low iteration complexity and low memory footprint. The toolbox has a dynamic Matlab interface which make the process of testing, comparing, and analyzing the algorithms simple. The algorithms are implemented using only basic arithmetic and logical operations and thus are suitable to run on low cost embedded hardware. It is shown that if an approximate solution is sufficient for a given application, there exists problems where some of the implemented algorithms obtain the solution faster than state-of-the-art commercial solvers.

关键词： Heuristic algorithms Prediction algorithms Approximation algorithms Complexity theory Hardware Linear systems Convergence

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