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第35届中国控制会议

作者： ZHANG Zhen LIU Binbin WANG Peng YAN Peng State Key Laboratory of Tribology & Institute of Manufacturing Engineering Department of Mechanical EngineeringTsinghua University Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua University State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University School of Automation Science and Electrical Engineering Beihang University School of Mechanical Engineering Shandong University

ISBN: (纸本)9781509009107

This paper presents an additive manufactured beam flexure-based XY positioning stage with spatial redundant *** order to restrict rotational error motions of the guidance module,a spatial redundant constraint is *** additive manufacturing technique is adopted to monolithically fabricate the proposed positioning *** simulation results show that the proposed XY positioning stage is capable to achieve ±2 x 2 mm2 working *** fabricated prototyping stage shows that the advanced manufactured flexure mechanism can achieve good geometric effect and could be a good alternative to a metal-based flexure mechanism.

关键词： Nanopositioning Beam flexure mechanism Additive manufacturing

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automatic Tuning of a Fuzzy Meta-model for Evacuation Speed Estimation

Automatic Tuning of a Fuzzy Meta-model for Evacuation Speed ...

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International Conference on Cybernetics and Informatics

作者： Michal Gregor Igor Miklosik Juraj Spalek Department of Control and Information Systems Faculty of Electrical Engineering University of Zilina

ISBN: (纸本)9781509018352

The paper concerns an application of genetic-fuzzy systems to automatic tuning of a fuzzy meta-model for evacuation speed estimation. The paper first covers some basic facts concerning evacuation in road tunnels and its simulation. It then proceeds to discuss the basics of genetic-fuzzy systems and proposes an evolutionary approach for automatic tuning of said meta-model. The approach is verified experimentally and the resulting error metrics are presented.

关键词： Fuzzy systems Meta-model Evolutionary methods Evacuation

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Process time optimization in reduced order ILC

Process time optimization in reduced order ILC

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IEEE Multi-Conference on systems and control

作者： Fabian Kennel Steven Liu Institute of Control Systems Department of Electrical and Computer Engineering University of Kaiserslautern

ISBN: (纸本)9781509007561

This paper presents an approach to a process time optimization in reduced order Iterative Learning control (ILC) which can handle nonlinear iterative/periodic systems and nonlinear disturbances/constraints. The reduced order approach leads to a simplified ILC structure and a decreased storage demand/calculation effort. The method is based on a Model Predictive control (MPC) approach and solves a tracking error optimization problem. In addition, an algorithm to minimize the process time is integrated in the ILC design. The approach is tested on a ball balancing platform where a periodic race course is tracked by a ball using servo motors as actuators for tilting.

关键词： processing time International Labour Conference Reduced order Servo Device Component tilting actuators Racetracks

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When does channel-output feedback enlarge the capacity region of the two-user linear deterministic interference channel? 1

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11th International Conference on Cognitive Radio Oriented Wireless Networks, CROWNCOM 2016

作者： Quintero, Victor Perlaza, Samir M. Esnaola, Iñaki Gorce, Jean-Marie CITI Laboratory 6 Av. des Arts Villeurbanne69621 France Department of Automatic Control and Systems Engineering The University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

ISBN: (数字)9783319403526

ISBN: (纸本)9783319403519

The two-user linear deterministic interference channel (LD-IC) with noisy channel-output feedback is fully described by six parameters that correspond to the number of bit-pipes between each transmitter and its corresponding intended receiver, i.e., (formula presented) and (formula presented) between each transmitter and its corresponding non-intended receiver i.e., n12 and n21;and between each receiver and its corresponding transmitter, i.e., (formula presented) and (formula presented). An LD-IC without feedback corresponds to the case in which (formula presented) and the capacity region is denoted by (formula presented). In the case in which feedback is available at both transmitters, (formula presented), the capacity is denoted by (formula presented). This paper presents the exact conditions on(formula presented) (resp. n←22) for observing an improvement in the capacity region (formula presented) (resp. (formula presented) with respect to (formula presented), for any 4-tuple (formula presented) ∈ IN4. Specifically, it is shown that there exists a threshold for the number of bit-pipes in the feedback link of transmitter-receiver pair 1 (resp. 2), denoted by (formula presented) (resp. (formula presented) for which any n(formula presented) (resp. (formula presented) enlarges the capacity region, i.e., (formula presented) (resp. (formula presented) ⊂ (formula presented). The exact conditions on (formula presented) (resp. (formula presented)) to observe an improvement on a single rate or the sum-rate capacity, for any 4-tuple (formula presented) ∈ IN4 are also presented in this paper. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications engineering 2016.

关键词： Feedback

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A survey of control strategies for spacecraft attitude and orientation

A survey of control strategies for spacecraft attitude and o...

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UKACC International Conference on control (control)

作者： H. B. Hassrizal J. A. Rossiter Department of Automatic Control and Systems Engineering The University of Sheffield Sheffield UK School of Mechatronic Engineering Universiti Malaysia Perlis Malaysia

This paper presents a survey of different control methods deployed for spacecraft attitude control with a focus on strengths, weaknesses and opportunities for improvement. Common methods discussed include Sliding Mode control (SMC), Unscented Kalman Filter (UKF) and Adaptive control. Common challenges are the disturbances and uncertainties in space and produced by the spacecraft. This overview is used as a foundation for proposing useful research directions for developing improved control methods for the spacecraft attitude and orientation, with core requirements being low cost, robustness, precision, high efficiency and low computational load. The paper also summarises key actuation types used for satellite orientation, magnetics actuator and reaction wheels actuator, as the control strategy deployed, robustness and performance have strong links to the actuation.

关键词： Space vehicles Earth Orbits Satellites Actuators Magnetics Wheels

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Butterworth Pattern-based Simultaneous Damping and Tracking controller Designs for Nanopositioning systems

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Frontiers in Mechanical engineering 2016年 2卷

作者： Russell, Douglas San-Millan, Andres Feliu, Vicente Aphale, Sumeet S. School of Engineering University of Aberdeen Aberdeen United Kingdom Department of Electrical Electronic and Automatic Control Engineering University of Castilla-La Mancha Ciadud Real Spain

The Butterworth filter is known to have maximally flat response. Incidentally, the same response is desired in precise positioning systems. This paper presents a method for obtaining a closed-loop Butterworth filter pattern using common control schemes for positioning applications, i.e., Integral Resonant control (IRC), Integral Force Feedback (IFF), Positive Position Feedback (PPF), and Positive Velocity and Position Feedback (PVPF). Simulations show a significant increase in bandwidth over traditional design methods and verify the desired pole placement is achieved. The simulations also show a significant limitation of the achievable bandwidth in the case of IRC, IFF, and PPF. For this reason, only PVPF is considered in experimental analysis. Experiments are performed using a two-axis serial kinematic nanopositioning stage. The results show a significant improvement in bandwidth, from 123 to 370 Hz, and increased positioning accuracy, specifically at the turn-around point, in comparison to the sequentially designed control scheme. © Copyright © 2016 Russell, San-Millan, Feliu and Aphale.

关键词： Butterworth filters

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PID synthesis under probabilistic parametric uncertainty

PID synthesis under probabilistic parametric uncertainty

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American control Conference

作者： Pedro Mercader Kristian Soltesz Alfonso Banos Department of Computer Sciences and Systems Engineering University of Murcia Spain Department of Automatic Control Lund University Sweden

ISBN: (纸本)9781467386838

In many system identification methods, process model parameters are considered stochastic variables. Several methods do not only yield expectations of these, but in addition their variance, and sometimes higher moments. This paper proposes a method for robust synthesis of the proportional-integral-derivative (PID) controller, taking parametric process model uncertainty explicitly into account. The proposed method constitutes a stochastic extension to the well-studied minimization of integrated absolute error (IAE) under H_∞-constraints on relevant transfer functions. The conventional way to find an approximate solution to the extended problem is through Monte Carlo (MC) methods, resulting in high computational cost. In this work, the problem is instead approximated by a deterministic one, through the unscented transform (UT), and its conjugate extension (CUT). The deterministic approximations can be solved efficiently, as demonstrated through several realistic synthesis examples.

关键词： Stochastic processes Robustness Process control Transforms Minimization Transfer functions Optimization

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The use of fractal dimension for purposes of AC motors functional steadiness analysis

The use of fractal dimension for purposes of AC motors funct...

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International Conference on Applied and Theoretical Electricity (ICATE)

作者： Ion Voncilă Mădălin Costin Mihai-Lucian Voncilă Automatic Control and Electrical Engineering Department University. „Dunărea de Jos” of Galati Faculty of Automatic Control and Computers University. Politehnica Bucharest

The paper deals with two analysis methods which can provide enough information regarding functional steadiness of electric drives using AC motors: frequential analysis method (determine the content of harmonics of the electric specific curves), and fractal analysis method (determine the fractal dimension of specific curves of time variation). The paper shows the complementarity of the two methods and the validity of the new method suggested (fractal analysis/fractal dimension) through the non-contradictory nature concerning the influence of any disturbance on the driving system functional steadiness.

关键词： Synchronous motors Drives Fractals Permanent magnet motors Harmonic analysis Frequency conversion Couplings

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Predictive control for an asymmetric multilevel converter for PV energy injection

Predictive control for an asymmetric multilevel converter fo...

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International Conference on Environment and electrical engineering (EEEIC)

作者： Javier Muñoz Fausto Cadena Patricio Gaisse Marco Rivera Eduardo Espinosa Raúl Gregor Department of Electrical Engineering Universidad de Talca Talca Chile Dept. of Environment and Energy Universidad Católica de la Santisima Concepción Concepcion Chile Lab. of Power and Control Systems Universidad Nacional de Asunción Luque CP Paraguay

ISBN: (纸本)9781538639184

Recent publications on multilevel converters show different topologies and control to obtain an improvement in the sinusoidal current waveform, controlling de DC voltage and the active/reactive power. This paper presents a 27-level asymmetric multilevel converter for photovoltaic injection using a predictive control algorithm that commands the three-phase converter to control the active power injected to the grid. The analyses include the detailed description of the converter valid states as well as the discrete time model of the equivalent circuit. The control strategy considers a master linear controller in charge to track the Maximum Power Point and a slave loop that includes a predictive controller, which is responsible of the current tracking. The proposal is validated through simulated results that illustrates the dynamic behavior of the converter under irradiance changes.

关键词： Mathematical model Prediction algorithms Integrated circuit modeling Topology Voltage control Predictive models Cost function

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Robust and Scalable Power System State Estimation via Composite Optimization

arXiv

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arXiv 2017年

作者： Wang, Gang Giannakis, Georgios B. Chen, Jie Digital Technology Center and the Electrical and Computer Engineering Department University of Minnesota MinneapolisMN55455 United States State Key Lab of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing100081 China Tongji University Shanghai200072 China

—In today’s cyber-enabled smart grids, high penetration of uncertain renewables, purposeful manipulation of meter readings, and the need for wide-area situational awareness, call for fast, accurate, and robust power system state estimation. The least-absolute-value (LAV) estimator is known for its robustness relative to the weighted least-squares (WLS) one. However, due to nonconvexity and nonsmoothness, existing LAV solvers based on linear programming are typically slow, hence inadequate for real-time system monitoring. This paper develops two novel algorithms for efficient LAV estimation, which draw from recent advances in composite optimization. The first is a deterministic linear proximal scheme that handles a sequence of (5 ∼ 10 in general) convex quadratic problems, each efficiently solvable either via off-the-shelf toolboxes or through the alternating direction method of multipliers. Leveraging the sparse connectivity inherent to power networks, the second scheme is stochastic, and updates only a few entries of the complex voltage state vector per iteration. In particular, when voltage magnitude and (re)active power flow measurements are used only, this number reduces to one or two, regardless of the number of buses in the network. This computational complexity evidently scales well to large-size power systems. Furthermore, by carefully mini-batching the voltage and power flow measurements, accelerated implementation of the stochastic iterations becomes possible. The developed algorithms are numerically evaluated using a variety of benchmark power networks. Simulated tests corroborate that improved robustness can be attained at comparable or markedly reduced computation times for medium- or large-size networks relative to existing alternatives. Copyright © 2017, The Authors. All rights reserved.

关键词： Electric power transmission networks

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