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American control Conference

作者： Michelle S. Chong Masashi Wakaiki Joao P. Hespanha Department of Electrical and Electronic Engineering the University of Melbourne Australia Center for Control Dynamical systems and Computation (CCDC) University of California Santa Barbara CA 93106-9560 USA

ISBN: (纸本)9781479917730

We address the problem of state estimation for multi-output continuous-time linear systems, for which an attacker may have control over some of the sensors and inject (potentially unbounded) additive noise into some of the measured outputs. To characterize the resilience of a system against such sensor attacks, we introduce a new notion of observability -- termed "observability under attacks" -- that addresses the question of whether or not it is possible to uniquely reconstruct the state of the system by observing its inputs and outputs over a period of time, with the understanding that some of the available system's outputs may have been corrupted by the opponent. We provide computationally efficient tests for observability under attacks that amount to testing the (standard) observability for an appropriate finite set of systems. In addition, we propose two state estimation algorithms that permit the state reconstruction in spite of the attacks. One of these algorithms uses observability Gramians and a finite window of measurements to reconstruct the initial state. The second algorithm takes the form of a switched observer that asymptotically converges to the correct state estimate in the absence of additive noise and disturbances, or to a neighborhood of the correct state estimate in the presence of bounded noise and disturbances.

关键词： State estimation Observability Linear system Additive noise Sensors

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Optimal scheduling of diesel generators in offshore support vessels to minimize fuel consumption

Optimal scheduling of diesel generators in offshore support ...

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Annual Conference of Industrial Electronics Society

作者： K. Srinivasa Rao Priyesh J. Chauhan Sanjib K. Panda Gary Wilson Xiong Liu Amit Kumar Gupta National University of Singapore Singapore SG Department of Electrical & Computer Engineering National University of Singapore Singapore Electrical Power & Control Systems Rolls-Royce Singapore Pte. Ltd. Singapore

ISBN: (纸本)9781479917631

This paper presents optimal generation scheduling for minimization of fuel consumption (FC) in an offshore support vessel with a dynamic positioning system and diesel generator (DG) sets of 8000 kW total capacity. FC is analyzed for equal load sharing among equal capacity DGs, optimal load sharing among equal capacity DGs, and optimal load sharing among unequal capacity DGs. Due to nonlinear specific FC (SFC) curves of the diesel engines, a Genetic Algorithm is used for optimal load sharing. The SFC-vs-load relationship obtained from Brake SFC (BSFC) map of the diesel engines is characterized using a cubic spline interpolation. A solution to the problem is attained by comparing yearly fuel consumption in the three cases for the load profile of target vessel. This method can be applied to any vessel equipped with multiple generating units. A vessel with proper selection of DG capacities and closed bus-tie can achieve maximum fuel savings; however, when deciding the DG capacity and load scheduling, it is necessary to consider fuel consumption alongside concerns such as optimizing exhaust emissions after-treatment, ensuring adequate power availability for essential services, and scheduling engine maintenance.

关键词： Fuels Diesel engines Genetic algorithms Optimal scheduling Splines (mathematics) Propulsion

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The Determination of the Shelf Mass in the Universal Shelving Stacker by Measuring the Frequency Converter Torque Generating Current of the Main Drive

Manufacturing Technology

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Manufacturing Technology 2015年第3期15卷 30-30页

作者： Kollár, Pavol Nikitin, Yuri Straka, Martin Department of Electrical Engineering and Mechatronics Faculty of Electrical Engineering and Informatics Technical university of Kosice Letna 9 Kosice042 00 Slovakia Department of Mechatronic Systems Kalashnikov Izhevsk State Technical University "Mechatronic Systems" Department Izhevsk Russia Logistics Institute of Industry and Transport Faculty of Mining Ecology Process Control and Geotechnology Technical university of Kosice Park Komenskeho 14 Kosice043 84 Slovakia

The correct determination of the shelf mass including content is very important for the proper function of a universal shelf stacker (USS) drives life and construction USS so that these elements were not overloaded. Weighing can be done by direct methods using various sensors tension and compression but also the indirect method, by the torque sensing of current frequency converter, which controls the speed of the three-phase asynchronous motor. This method does not require any additional construction or adaptation or additional sensors or electronic evaluation system power operation. Weighting method of shelf in USS is based on the fact that the torque converter current is proportional to the sum of the weight of the shelf and the extractor and its value provides almost every frequency converter. In contrast to the direct weighing method of the shelf it is obvious economic advantage of this method and the accuracy is sufficient for the operation of USS. Copyright © 2015. Published by Manufacturing Technology. All rights reserved.

关键词： Frequency converters

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An expectation maximisation algorithm for behaviour analysis in video

An expectation maximisation algorithm for behaviour analysis...

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International Conference on Information Fusion

作者： Olga Isupova Lyudmila Mihaylova Danil Kuzin Garik Markarian Francois Septier Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK School of Computing and Communications Lancaster University Lancaster UK Telecom Lille Institut Mines-Telecom Villeneuve d'Ascq Cedex France

Surveillance systems require advanced algorithms able to make decisions without a human operator or with minimal assistance from human operators. In this paper we propose a novel approach for dynamic topic modeling to detect abnormal behaviour in video sequences. The topic model describes activities and behaviours in the scene assuming behaviour temporal dynamics. The new inference scheme based on an Expectation-Maximisation algorithm is implemented without an approximation at intermediate stages. The proposed approach for behaviour analysis is compared with a Gibbs sampling inference scheme. The experiments both on synthetic and real data show that the model, based on Expectation-Maximisation approach, outperforms the one, based on Gibbs sampling scheme.

关键词： Visualization Hidden Markov models Training Testing Markov processes Feature extraction Joints

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Inverse parametric convex programming problems via convex liftings 19

Inverse parametric convex programming problems via convex li...

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Nguyen, N.A. Olaru, S. Rodriguez-Ayerbe, P. Hovd, M. Necoara, I. Automatic Control Department Gif-sur-Yvette France Department of Engineering Cybernetics Norwegian University of Science and Technologies Trondheim Norway Politehnica University of Bucharest Automatic Control and Systems Engineering Department Bucharest Romania

ISBN: (纸本)9783902823625

The present paper introduces a procedure to recover an inverse parametric linear or quadratic programming problem from a given polyhedral partition over which a continuous piecewise affine function is defined. The solution to the resulting parametric linear problem is exactly the initial piecewise affine function over the given original parameter space partition. We provide sufficient conditions for the existence of solutions for such inverse problems. Furthermore, the constructive procedure proposed here requires at most one supplementary variable in the vector of optimization arguments. The principle of this method builds upon an inverse map to the orthogonal projection, known as a convex lifting. Finally, we show that the theoretical results has a practical interest in Model Predictive control (MPC) design. It is shown that any linear Model Predictive controller can be obtained through a reformulated MPC problem with control horizon equal to two prediction steps. © IFAC.

关键词： Inverse problems

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Rating and matching in peer review systems 52

Rating and matching in peer review systems

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2014 52nd Annual Allerton Conference on Communication, control, and Computing, Allerton 2014

作者： Xiao, Yuanzhang Dorfler, Florian Van Der Schaar, Mihaela Department of Electrical Engineering UCLA United States Automatic Control Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781479980093

Peer review (e.g., review of research papers) is essential for the success of the scientific community. In peer review, the reviewers voluntarily exert costly effort in reviewing papers. Hence, it is important to design mechanisms to elicit high effort from reviewers. Exploiting the fact that the researchers interact with each other repeatedly (e.g., by submitting and reviewing papers over years), we propose a rating and matching mechanism to elicit high effort from reviewers. Our proposed mechanism overcomes two major difficulties, namely adverse selection (i.e., the unidentifiable quality of heterogeneous reviewers) and moral hazard (i.e., the unobservable effort levels from reviewers). Specifically, our proposed mechanism assigns and updates ratings for the researchers, and matches researchers' papers to reviewers with similar ratings. In this way, the mechanism identifies different types of reviewers by their ratings, and incentivizes different reviewers to exert high effort. Focusing on the matching rule, we first provide design guidelines for a general matching rule that leads the system to an equilibrium, where the reviewers' types are identified and their high efforts are elicited. Then we study in detail a baseline matching rule that assigns each researcher's paper to one of the two reviewers with the closest ratings, provide guidelines of how to choose the initial ratings, and analyze equilibrium review quality and equilibrium ratings. Finally, we extend the baseline matching rule to two classes. The first extension provides extra reward and/or punishment by adjusting the probabilities of matching each researcher's paper to its neighbors. The second extension provides extra reward and/or punishment by allowing to match each researcher's paper to reviewers other than its neighbors. We prove that it is beneficial (in the sense that the optimal equilibrium review quality is higher) to reward reviewers in the first extension, and to punish reviewers in the sec

关键词： Risk management

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On the linear constrained regulation problem for continuous-time systems 19

On the linear constrained regulation problem for continuous-...

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Bitsoris, George Olaru, Sorin Vassilaki, Marina Control Systems Laboratory Department of Electrical and Computer Engineering University of Patras Patrs26500 Greece Automatic Control Department Gif-sur-Yvette91190 France ASPETE Department of Electrical Engineering Education N. Heraklion 14121 Athens Greece

ISBN: (纸本)9783902823625

In this paper the regulation problem for linear continuous-time systems by linear state-feedback under linear state and/or control constraints is investigated. This problem, named the Linear Constrained Regulation Problem, has been extensively studied when the regulation concerns an equilibrium situated in the interior of the domain of admissible states. In this paper the case when the desired equilibrium state is on the boundary of the domain of admissible states is considered. The tools used for the analysis and design of this kind of control problems are the conditions of positive invariance of polyhedral sets, Lyapunov-like polyhedral functions, LMI methods and eigenstructure assignment techniques. © IFAC.

关键词： Continuous time systems

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H_∞ control for a Smart Micro-Positioning System with an Analytical Model for the Output of the Inverse Compensation

H_∞ Control for a Smart Micro-Positioning System with an An...

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American control Conference

作者： Micky Rakotondrabe Omar Aljanaideh Mohammad Al Janaideh Department of Automatic Control and Micro-Mechatronic Systems department (AS2M) FEMTO-ST Institute CNRS - University of Franche-Comt at Besanon (UFC) - ENSMM - UTBM Besanon France Department of Mechanical Engineering The University of Jordan Amman 11942 Jordan Department of Mechatronics Engineering The University of Jordan Amman 11942 Jordan

ISBN: (纸本)9781479917730

An experimental study was carried out on a piezoelectric actuator in order to explore the benefits of a mathematical formula [1], that describes the output of the inverse compensation when an inverse Prandtl-Ishlinskii hysteresis model is applied as a feedforward compensator. The inverse Prandtl-Ishlinskii was first formulated and applied for compensation of hysteresis nonlinearities of a piezoelectric actuator. The theoretical formula was afterwards employed to construct an H_∞ feedback control. The controller was calculated and applied to the piezoelectric actuator with the inverse feedforward model. The experimental results verify the effectiveness of the controller and the benefits that the theoretical formula of the inverse compensation can contribute.

关键词： Hysteresis Piezoelectric actuators Feedforward neural networks Adaptive control Standards

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Semiparametric Density Forecasting of Electricity Load for Smart Charging of Electric Vehicles

Semiparametric Density Forecasting of Electricity Load for S...

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Conference on control Applications

作者： Can Bikcora Lennart Verheijen Siep Weiland Control Systems Group Department of Electrical Engineering Eindhoven University of Technology 5600 MB Eindhoven The Netherlands Innovation Department Enexis B.V. 5223 MB 's-Hertogenbosch The Netherlands

ISBN: (纸本)9781479977970

To be utilized in the smart charging of plug-in electric vehicles, this paper proposes semiparametric conditional mean and variance models for the daily density forecasting of the electricity load. The mean is modeled by means of an autoregressive moving average model with exogenous inputs (ARMAX), whereas several options for the variance evolution are investigated, starting with modeling the variance as a power of the conditional mean, then as a piecewise constant function, and finally as a generalized autoregressive conditional heteroskedasticity (GARCH) model. Due to the possible non-Gaussianity of the distribution of the stochastic components, a quasi-maximum likelihood estimation (QMLE) with the Pearson type IV (P-IV) distribution is also considered, apart from the estimation with the Gaussianity assumption. Moreover, the daily density forecasts are generated in a nonparametric manner by propagating samples from the stochastic components iteratively through the available model. These strategies, involving different options for variance modeling and estimation, are compared in terms of their forecast performances on two representative phase currents from the low voltage cables of medium-to-low voltage transformers in the Netherlands. The results indicate that the QMLE with the Gaussianity assumption performs better due to the additional complexity of the P-IV distribution on estimation. Concerning the variance models, the piecewise constant and GARCH models are more preferable when processing phase currents exhibiting only daily seasonality, and the model as a power of the conditional mean outperforms the others if both daily and weekly seasonality and hence more complexity is present.

关键词： utilized smart charging plug-in electric

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The iceberg risk in the Titanic year of 1912: Was it exceptional?

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Significance 2014年第3期11卷 6-10页

作者： Bigg, Grant Billings, Steve Department of Geography University of Sheffield United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

The sinking of the Titanic is typically blamed on human, design and construction errors. But what of the iceberg that did the damage? Was it a lone berg, or one of many in the area? And should it have been that far south? Earth systems scientist Grant Bigg and systems engineer Steve Billings assess the data. © 2014 The Royal Statistical Society.

关键词： ICEBERGS RESEARCH MARINE accidents NAVAL architecture HUMAN error

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