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IFAC-PapersOnLine 2015年第29期48卷 217-228页

作者： Rossiter, J.A. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

Modern technology offers many opportunities to do things differently and hence a key challenge for academic staff is to decide which technology or approach do they use, how do they use it and of course, why should they use it? This plenary paper is aimed at pragmatic approaches to improving the quality of the student learning experience which recognise limitations on staff time and hence using the belief: sometimes quick and dirty now is better than perfect in the distant future. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Teaching systems science Web Design Academic staff Distant futures Education resource Modern technologies Staff time Student learning experiences Teaching methodologies Video production

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Evaluation of Spectral Learning for the Identification of Hidden Markov Models

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IFAC-PapersOnLine 2015年第28期48卷 897-902页

作者： Mattila, Robert Rojas, Cristian R. Wahlberg, Bo Department of Automatic Control and ACCESS School of Electrical Engineering KTH Royal Institute of Technology StockholmSE-100 44 Sweden

Hidden Markov models have successfully been applied as models of discrete time series in many fields. Often, when applied in practice, the parameters of these models have to be estimated. The currently predominating identification methods, such as maximum- likelihood estimation and especially expectation-maximization, are iterative and prone to have problems with local minima. A non-iterative method employing a spectral subspace-like approach has recently been proposed in the machine learning literature. This paper evaluates the performance of this algorithm, and compares it to the performance of the expectation- maximization algorithm, on a number of numerical examples. We find that the performance is mixed; it successfully identifies some systems with relatively few available observations, but fails completely for some systems even when a large amount of observations is available. An open question is how this discrepancy can be explained. We provide some indications that it could be related to how well-conditioned some system parameters are. © 2015

关键词： Hidden Markov models Identification (control systems) Image segmentation Iterative methods Learning algorithms Learning systems Maximum likelihood estimation Maximum principle Method of moments Expectation maximizations Expectation maximization algorithms Identification method Machine learning literature Non iterative method Performance evaluations Spectral factorizations Spectral learning

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Enthusing students to engage and learn control with flexible multimedia assignments

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IFAC-PapersOnLine 2015年第29期48卷 211-216页

作者： Rossiter, J.A. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

This paper gives a brief survey of several ideas in the literature on how to increase student enthusiasm and engagement with learning by incorporating multimedia production into assignments. A description is given on how these ideas have been adopted with the scenario of control engineering for bioengineers. Evidence of student work and student reflections of the efficacy of this approach, and indeed the excellent student feedback, are provided. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Students

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Event-triggered control for discrete-time linear parameter-varying systems

Event-triggered control for discrete-time linear parameter-v...

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American control Conference

作者： Arash Golabi Nader Meskin Roland Toth Javad Mohammadpour Tijs Donkers Department of Electrical Engineering College of Engineering Qatar University P.O. Box 2713 Doha Qatar Control Systems Group Department of Electrical Engineering Eindhoven University of Technology P.O. Box 513 5600 MB The Netherlands Complex Systems Control Lab College of Engineering University of Georgia Athens 30602 USA

ISBN: (纸本)9781467386838

This paper examines a new event-triggered control design approach for discrete-time linear parameter-varying (LPV) systems to reduce the data transmission of the scheduling variables and states to the controller. A parameter dependent state-feedback controller and an event-triggering condition are designed jointly to stabilize the closed-loop system. Then, a procedure is proposed to obtain an event-based reference tracking controller for the LPV systems such that the steady-state response of the system output tends to a desired reference signal and the required tracking performance specifications are satisfied. Sufficient conditions for the design of the event-triggered controller are obtained in the form of linear matrix inequalities (LMI). Simulation results are presented to demonstrate the effectiveness of the proposed control design approach.

关键词： Output tracking Linear parameter-varying systems Event-triggered control Input-to-state stable Linear-matrix inequality

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Tracking of wireless mobile nodes in he presence of unknown path-loss characteristics 18

Tracking of wireless mobile nodes in he presence of unknown ...

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18th International Conference on Information Fusion, Fusion 2015

作者： Khan, M.W. Kemp, A.H. Salman, N. Mihaylova, L.S. School of Electronic and Electrical Engineering University of Leeds United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

ISBN: (纸本)9780982443866

Due to the difficult characterization of the propagation model, most studies on racking of mobile nodes assume the correct knowledge of the power-distance gradients or the path-loss exponents (PLEs). In this paper, we first investigate the impact of erroneous PLEs on positioning of a wireless nodes when both distance and bearing measurements are available. Thus, an analytical expression of the mean square error (MSE) in location estimation is derived in case of erroneous PLEs. Second, we propose a novel online PLE estimation and tracking algorithm in dynamic environments. The proposed algorithm estimates the PLE of individual links a every time-step using he generalized pattern search (GenPS) algorithm. The PLE estimates update the observation vector which is used in a Kalman filter (KF) and a particle filter (PF) for tracking. Simulation results show that the racking performance degrades drastically with an incorrect assumption for the PLE values. Further simulations show that tracking with PLE estimation performs considerably beer compared to tracking with incorrectly assumed PLEs. © 2015 IEEE.

关键词： Beer

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Combining active structural damping and active suspension control in flexible bodied railway vehicles

Combining active structural damping and active suspension co...

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第35届中国控制会议

作者： Xiang Zheng Argyrios Zolotas Roger Goodall Key Lab of Marine Technology and Control Engineering Scientific Research AcademyShanghai Maritime University Intelligent Systems Research Group School of EngineeringCollege of ScienceUniversity of Lincoln Control Systems Group Department of Electronic and Electrical EngineeringLoughborough University

ISBN: (纸本)9781509009107

There is a desire to design lightweight railway vehicle bodies for future high speed ***,suppression of structural vibration of the flexible lightweight vehicle body was attempted via use of active suspensions(conventional actuators)or by structural damping via piezoelectric actuators,with the aim being to improve the ride *** a railway vehicle the typical active suspension setup comprises front and rear suspension conventional actuators,while adding more macro-actuator elements to minimise structural vibrations can substantially impact vehicle weight and location *** this paper,we show that piezoelectric actuator control can provide complementary action to active *** control is adopted for combined active structural damping and active suspension design via Linear Quadratic Gaussian(LQG) method and modal control with skyhook damping *** side-view model of a flexible-bodied railway vehicle integrated with piezoelectric actuators and appropriate sensor outputs is derived and the placement of the piezoelectric actuators and sensors is addressed via structural *** is shown that vibrations of both the flexible modes and rigid modes are suppressed *** suggests that with the combined approach,control by both piezoelectric actuators and suspension actuators could be used in a more efficient way to address vibrations in light railway vehicle bodies.

关键词： Railway vehicles piezoelectric actuators and sensors active structural damping active suspension LQG Skyhook damping

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Experiment design for formal verification via stochastic optimal control

Experiment design for formal verification via stochastic opt...

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European control Conference (ECC)

作者： S. Haesaert P. M. J. Van den Hof A. Abate Control Systems group in the Faculty of Electrical Engineering Eindhoven University of Technology Department of Computer Science Oxford University UK

A measurement-based statistical verification approach is developed for systems with partly unknown dynamics. Grey-box systems, which are specified as a model class, are subject to identification experiments that enable accepting or rejecting system properties expressed as formulae in a linear-time logic with a given confidence. We employ a Bayesian framework for the computation of the confidence level and for the design of experiments to increase the confidence. The experiment design is formulated as a stochastic optimal control problem, which solvable via dynamic programming. Applied to linear control systems, this work enables efficient data-driven verification of partly-known dynamics with controllable non-determinism (inputs) and noisy output observations. A numerical case study concerning the safety of a dynamical system is used to elucidate this approach.

关键词： Noise measurement Bayes methods Uncertainty Mathematical model Markov processes Optimization

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Generalized model for load frequency control studies in a deregulated environment

Generalized model for load frequency control studies in a de...

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European control Conference

作者： Evans E.Ejegi John A. Rossiter Paul Trodden Department of Automatic Control and Systems Engineering (ACSE) University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

ISBN: (纸本)9781509025923

This paper proposes a generalized model for load frequency control (LFC) studies in a deregulated environment. The key advantage of this formulation is that it can accommodate LFC studies in a realistic environment, where interconnected control areas (CAs) have different rated capacities. The significance and effectiveness of this formulation is demonstrated using a 7-area deregulated network which is a modification of the CIGRE-7 machine test system.

关键词： LFC CAs Generalized model

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Synchronization of Lienard-type oscillators in uniform electrical networks

Synchronization of Lienard-type oscillators in uniform elect...

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American control Conference

作者： Mohit Sinha Florian Dorfler Brian B. Johnson Sairaj V. Dhople Department of Electrical and Computer Engineering at the University of Minnesota (UMN) Minneapolis United States of America Automatic Control Laboratory at ETH Zurich Switzerland Power Systems Engineering Center at the National Renewable Energy Laboratory (NREL) Golden CO United States of America

ISBN: (纸本)9781467386838

This paper presents a condition for global asymptotic synchronization of Lienard-type nonlinear oscillators in uniform LTI electrical networks with series R-L circuits modeling interconnections. By uniform electrical networks, we mean that the per-unit-length impedances are identical for the interconnecting lines. We derive conditions for global asymptotic synchronization for a particular feedback architecture where the derivative of the oscillator output current supplements the innate current feedback induced by simply interconnecting the oscillator to the network. Our proof leverages a coordinate transformation to a set of differential coordinates that emphasizes signal differences and the particular form of feedback permits the formulation of a quadratic Lyapunov function for this class of networks. This approach is particularly interesting since synchronization conditions are difficult to obtain by means of quadratic Lyapunov functions when only current feedback is used and for networks composed of series R-L circuits. Our synchronization condition depends on the algebraic connectivity of the underlying network, and reiterates the conventional wisdom from Lyapunov- and passivity-based arguments that strong coupling is required to ensure synchronization.

关键词： Oscillators Synchronization Integrated circuit interconnections Integrated circuit modeling Lyapunov methods Limit-cycles Mathematical model Oscillators integrated circuit interconnections integrated circuit modelling Lyapunov methods Liapunov function Electric circuits Power grids Mathematical Model current feedback

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One-bit compressive sampling with time-varying thresholds for sparse parameter estimation

One-bit compressive sampling with time-varying thresholds fo...

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Sensor Array and Multichannel Signal Processing Workshop

作者： Christopher Gianelli Luzhou Xu Jian Li Petre Stoica Electrical and Computer Engineering University of Florida Florida Gainesville USA Department of Systems and Control Uppsala University Uppsala Sweden

ISBN: (纸本)9781509021048

This paper considers the problem of estimating the parameters of a signal using time-varying thresholded noisy one-bit measurements. The problem is shown to be deterministically identifiable under reasonable conditions on the signal and thresholds. A spectral sensing application is considered, and two sparse methods are presented. In addition to the standard ℓ 1 norm based approach, a “zero-norm” approximation via the logarithm function is used, and shown to yield sparser estimates in a numerical example.

关键词： Quantization (signal) Indexes Uncertainty Additive noise Parameter estimation Sensors Estimation

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