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European control Conference

作者： Andrea Carron Rushabh Patel Francesco Bullo Department of Information Engineering University of Padova Via Gradenigo 6/a 35131 Padova Italy Department of Mechanical Engineering Center for Control Dynamical Systems and Computation College of Engineeringm University of California at Santa Barbara USA

ISBN: (纸本)9781509025923

This article provides analysis results for the weighted hitting time and the pairwise weighted hitting time of a Markov chain. This concepts are useful in many applications from robotics to patrolling, environment monitoring and resources optimization. The aforementioned quantities are a performance indexes which measure the expected time taken by a random walker to travel from an arbitrary node of a graph to a second randomly selected node and the expected time to travel between two chosen nodes. These metrics can be used as objective function in optimization problems. In fact we propose a numerical example applied to robotic surveillance where the weighted hitting time is our cost to minimize with respect to the transition matrix of the agent.

关键词： Hitting time doubly-weighted graphs application

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L2-gain analysis of regenerative switched linear systems with sampled-data state-feedback control

L2-gain analysis of regenerative switched linear systems wit...

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American control Conference (ACC)

作者： Masaki Ogura Masashi Wakaiki João P. Hespanha Victor M. Preciado Department of Electrical and Systems Engineering University of Pennsylvania PA USA Department of Electrical and Electronic Engineering Chiba University Chiba Japan Center for Control Dynamical-systems and Computation (CCDC) University of Carifornia Santa Barbara CA USA

In this paper, we analyze the L 2 -gain of a class of switched linear systems under sampled-data state-feedback control. We consider switched linear systems whose switching signal is a regenerative process. Using the lifting approach and piecewise-constant approximations, we derive a sequence whose limit inferior upper-bounds the L 2 -gain of the closed-loop system. Each term of the sequence can be found by solving a linear matrix inequality. We illustrate the results by the L 2 -gain analysis of a linear system with a failure-prone controller.

关键词： Linear systems Switches Markov processes Random variables Modeling

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Experimental and numerical investigation of static and dynamic vortex generators on an airfoil with a deflected flap 8

Experimental and numerical investigation of static and dynam...

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8th AIAA Flow control Conference, 2016

作者： Rice, Thomas T. Cummings, R. Clingman, D.J. Sahni, O. Amitay, M. Center for Flow Physics and Control Rensselaer Polytechnic Institute TroyNY12180 United States Scientific Computation Research Center Rensselaer Polytechnic Institute TroyNY12180 United States Boeing Research and Technology The Boeing Company PO Box 3707 SeattleWA98124 United States Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Aerospace Enginering Rensselaer Polytechnic Institute TroyNY12180 United States

ISBN: (数字)9781624104329

ISBN: (纸本)9781624104329

Flow separation can be detrimental in a variety of aerospace applications. A traditional method of preventing or delaying flow separation has been static vortex generators. They are effective in mitigating flow separation, however, they can impose a drag penalty during certain flow regimes, e.g., when the flow is not separated. An alternative to a static vortex generator (SVG) is a dynamic vortex generator (DVG), which can be deployed into the flow when needed and retracted when not needed. Additionally, a DVG can be oscillated about a mean height with a specified amplitude and frequency to target certain frequencies that may be present in the flow, which can make it more effective. An experimental and numerical investigation was conducted on a modified NACA 0012 airfoil with flap deflections of 20° and 30° to study the effectiveness of VGs on flow reattachment over the flap. Simulations were conducted using the unsteady Reynolds averaged Navier-Stokes (URANS) equations together with the Spalart-Allmaras turbulent model. In the simulations, flap deflections of 20° and 30° were considered, while the experiments focused on the flap deflection of 20°. For the flap deflection of 30°, both the baseline and SVG cases were simulated while for the flap deflection of 20° only a baseline simulation was carried out. For the SVG, a parametric numerical study was performed in which chord-wise location and height of the VGs were varied to guide the experiments in terms of VG location and height. SVGs were found to increase the lift-to-drag ratio and reduce fluctu-ating forces. Taller VGs were found to be more effective while VGs placed at XVG = 0.53 resulted in a similar effectiveness at two Reynolds numbers. For the flap deflection of 20°, experimental and numerical data showed a good agreement for the baseline case. In the experiments, the distributions of the pressure around the airfoil were measured at different spanwise locations for the baseline, SVG and DVG cases at the fl

关键词： Flow separation

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Quantum gate identification: Error analysis, numerical results and optical experiment?

arXiv

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arXiv 2017年

作者： Wang, Yuanlong Yin, Qi Dong, Daoyi Qi, Bo Petersen, Ian R. Hou, Zhibo Yonezawa, Hidehiro Xiang, Guo-Yong School of Engineering and Information Technology University of New South Wales CanberraACT2600 Australia Centre for Quantum Computation and Communication Technology Australian Research Council CanberraACT2600 Australia Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China Key Laboratory of Systems and Control Academy of Mathematics and Systems Science CAS Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Research School of Engineering Australian National University CanberraACT0200 Australia

The identification of an unknown quantum gate is a significant issue in quantum technology. In this paper, we propose a quantum gate identification method within the framework of quantum process tomography. In this method, a series of pure states are inputted to the gate and then a fast state tomography on the output states is performed and the data are used to reconstruct the quantum gate. Our algorithm has computational complexity O(d3) with the system dimension d. The algorithm is compared with maximum likelihood estimation method for the running time, which shows the efficiency advantage of our method. An error upper bound is established for the identification algorithm and the robustness of the algorithm against the purity of input states is also tested. We perform quantum optical experiment on single-qubit Hadamard gate to verify the effectiveness of the identification algorithm. Copyright © 2017, The Authors. All rights reserved.

关键词： computational complexity

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L2-gain analysis of systems with clock offsets

L2-gain analysis of systems with clock offsets

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American control Conference

作者： Masashi Wakaiki Kunihisa Okano Joao P. Hespanha Department of Electrical and Electronic Engineering Chiba University 1-33 Yayoi-cho Inage-ku 263-8522 Japan Center for Control Dynamical-systems and Computation (CCDC) University of California Santa Barbara 93106-9560 USA

ISBN: (纸本)9781467386838

In this paper, we analyze the L2-gain of sampled-data systems with asynchronous sensing and control. The closed-loop system has time-varying clock offsets and sampling intervals and can be modeled as a parameter-uncertain system. We use a lifting approach and a gridding and norm-bounded approach in order to analyze intersample behavior and deal with parameter uncertainty, respectively. An upper bound on the L~2-gain is derived via linear matrix inequalities. We illustrate the proposed method by applying it to an active suspension system.

关键词： Linear matrix inequalities Clocks Closed loop systems Time-varying systems Delays Stability analysis Upper bound Closed loop systems Timing devices linear matrix inequalities time-varying systems Upper bound Stability analysis clock skew System analyses delay offsets Active Suspension Systems gridding

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A Solvability Condition for Reactive Power Flow

A Solvability Condition for Reactive Power Flow

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IEEE Annual Conference on Decision and control

作者： John W. Simpson-Porco Florian Dorfler Francesco Bullo Department of Mechanical Engineering and the Center for Control Dynamical Systems and Computation University of California Santa Barbara Automatic Control Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781479978878

A central question in the analysis and operation of power networks is the feasibility of a unique high-voltage solution to the power flow equations satisfying operational constraints. For planning, monitoring, and contingency analysis in transmission networks, the high-voltage solution of these nonlinear equations can be constructed only numerically or roughly approximated using a linear DC power flow. In this work we analytically study the solvability of the nonlinear decoupled reactive power flow equations, and present a solvability condition relating the existence of a unique high-voltage solution to the spatial distribution of loading and the effective impedances between load buses. We validate the accuracy and applicability of our results through standard power network test cases.

关键词： Reactive power Mathematical model Generators Load modeling Power system stability Loading Numerical stability

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Optimal Voltage Support and Stress Minimization in Power Networks

Optimal Voltage Support and Stress Minimization in Power Net...

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IEEE Annual Conference on Decision and control

作者： Marco Todescato John W. Simpson-Porco Florian Dorfler Ruggero Carli Francesco Bullo Department of Information Engineering University of Padova Department of Mechanical Engineering and the Center for Control Dynamical System and Computation University of California at Santa Barbara Automatic Control Laboratory Swiss Federal Institute (ETH) Zurich

ISBN: (纸本)9781479978878

A standard operational requirement in power systems is that the voltage magnitudes must lie within prespecified bounds. Conventional wisdom suggests that such a tightly regulated voltage profile should also guarantee a secure system, operating far from static bifurcation instabilities such as voltage collapse. Here we demonstrate that this conclusion is generally false, and that the distance from voltage collapse is a systems-level objective distinct from ensuring voltage limits. We formulate an optimization problem which maximizes the distance to voltage collapse through injections of reactive power, subject to power flow and operational voltage constraints. By exploiting a linear reformulation of the power flow equations we arrive at a convex reformulation which can be efficiently solved for the optimal reactive power injections. We illustrate the performance of our results with the IEEE30 bus network.

关键词： Voltage collapse Power grids voltage magnitude Reactive power optimum voltage flow equations Injections Power flow power systems operational requirement Bus networks operational voltage voltage limits

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Observability of linear systems under adversarial attacks

Observability of linear systems under adversarial attacks

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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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26th Annual computational Neuroscience Meeting (CNS*2017): Part 3 Antwerp, Belgium. 15-20 July 2017 Abstracts

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 95-176页

作者： [Anonymous] Department of Neuroscience Yale University New Haven CT 06520 USA Department Physiology & Pharmacology SUNY Downstate Brooklyn NY 11203 USA NYU School of Engineering 6 MetroTech Center Brooklyn NY 11201 USA Departament de Matemàtica Aplicada Universitat Politècnica de Catalunya Barcelona 08028 Spain Institut de Neurobiologie de la Méditerrannée (INMED) INSERM UMR901 Aix-Marseille Univ Marseille France Center of Neural Science New York University New York NY USA Aix-Marseille Univ INSERM INS Inst Neurosci Syst Marseille France Laboratoire de Physique Théorique et Modélisation CNRS UMR 8089 Université de Cergy-Pontoise 95300 Cergy-Pontoise Cedex France Department of Mathematics and Computer Science ENSAT Abdelmalek Essaadi’s University Tangier Morocco Laboratory of Natural Computation Department of Information and Electrical Engineering and Applied Mathematics University of Salerno 84084 Fisciano SA Italy Department of Medicine University of Salerno 84083 Lancusi SA Italy Dipartimento di Fisica Università degli Studi Aldo Moro Bari and INFN Sezione Di Bari Italy Data Analysis Department Ghent University Ghent Belgium Coma Science Group University of Liège Liège Belgium Cruces Hospital and Ikerbasque Research Center Bilbao Spain BIOtech Department of Industrial Engineering University of Trento and IRCS-PAT FBK 38010 Trento Italy Department of Data Analysis Ghent University Ghent 9000 Belgium The Wellcome Trust Centre for Neuroimaging University College London London WC1N 3BG UK Department of Electronic Engineering NED University of Engineering and Technology Karachi Pakistan Blue Brain Project École Polytechnique Fédérale de Lausanne Lausanne Switzerland Departement of Mathematics Swansea University Swansea Wales UK Laboratory for Topology and Neuroscience at the Brain Mind Institute École polytechnique fédérale de Lausanne Lausanne Switzerland Institute of Mathematics University of Aberdeen Aberdeen Scotland UK Department of Integrativ

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Real-time Pricing and Distributed Decision Makings Leading to Optimal Power Flow of Power Grids

Real-time Pricing and Distributed Decision Makings Leading t...

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American control Conference

作者： Kenji Hirata Joao P. Hespanha Kenko Uchida Department of Mechanical Engineering Nagaoka University of Technology Nagaoka 940 2188 Japan Center for Control Dynamical Systems and Computation and the Department of Electrical and Computer Engineering University of California Santa Barbara CA 93106 USA Department of Electrical Engineering and Bioscience Waseda University Tokyo 169 8555 Japan

ISBN: (纸本)9781479917730

Motivated by distributed control problems of power supply/demand networks, this paper investigates application case studies of the real-time pricing and distributed decision makings methodology. We consider the optimal power flow problem with the DC power flow model, and the New England 39-bus test system is used. Stability of the resulting price based control system is analyzed with consideration for specific structures of the power flow problem. The resulting simulation studies illustrate the efficiency of the proposed method and validate the stability analysis procedure.

关键词： optimal load flow Power grids Power flow distributed decision making Pricing decentralised control Test systems DC load flow

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