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  • Conference paper
    Valsera-Naranjo E, Sumper A, Gomis-Bellmunt O, Junyent-Ferre A, Martinez-Rojas Met al., 2009,

    Design of a pitch control of a wind turbine to improve system frequency response

    , 13th European Conference on Power Electronics and Applications (EPE 2009), Publisher: IEEE, Pages: 3978-+
  • Conference paper
    Jones BL, Kerrigan EC, 2009,

    When is the discretization of a PDE good enough for control?

    , IEEE International Conference on Control and Automation, Publisher: IEEE, Pages: 133-+, ISSN: 1948-3449
  • Conference paper
    Astolfi A, Ortega R, Venkatraman A, 2009,

    A Globally Exponentially Convergent Immersion and Invariance Speed Observer for <i>n</i> Degrees of Freedom Mechanical Systems with constraints

    , 1st International Workshop on Networked Embedded and Control System Technologies/European and Russian R&D Cooperation Workshop, Publisher: INSTICC-INST SYST TECHNOLOGIES INFORMATION CONTROL & COMMUNICATION, Pages: 134-+
  • Conference paper
    Dicken J, Mitcheson PD, Stoianov I, Yeatman EMet al., 2009,

    Increased Power Output from Piezoelectric Energy Harvesters by Pre-Biasing

    , PowerMEMS 2009, Pages: 75-78, ISSN: 2151-3155

    This paper presents, for the first time, experimental results demonstrating a new approach to increasing the power output of piezoelectric energy harvesters by applying a bias charge at the beginning of each half cycle of motion. Ultimate power limits of inertial energy harvesters depend only on the device size and nature of the excitation, rather than on the transduction mechanism. However, practical devices generally perform well below the theoretical limit, often because a sufficiently high transducer damping force cannot be achieved. For suchcases, we show that the generator effectiveness is improved by a pre-biasing technique, and present simulationresults with experimental verification. These results show that the effectiveness of the piezoelectric generator isimproved by more than 10 times compared to an optimised purely resistive load. In practice our gains were limited by the voltage breakdown of the components used.
  • Conference paper
    Laila DS, Larsson M, Pal BC, Korba Pet al., 2009,

    Nonlinear damping computation and envelope detection using Hilbert transform and its application to power systems wide area monitoring

    , 2009 IEEE Power and Energy Society General Meeting
  • Journal article
    Costa EF, Astolfi A, 2009,

    CHARACTERIZATION OF EXPONENTIAL DIVERGENCE OF THE KALMAN FILTER FOR TIME-VARYING SYSTEMS

    , SIAM JOURNAL ON CONTROL AND OPTIMIZATION, Vol: 48, Pages: 2917-2944, ISSN: 0363-0129
  • Journal article
    Li Z, Jaimoukha IM, 2009,

    Observer-based fault detection and isolation filter design for linear time-invariant systems

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 82, Pages: 171-182, ISSN: 0020-7179
  • Journal article
    Angeli D, Bliman P-A, 2009,

    CONVERGENCE SPEED OF UNSTEADY DISTRIBUTED CONSENSUS: DECAY ESTIMATE ALONG THE SETTLING SPANNING-TREES

    , SIAM JOURNAL ON CONTROL AND OPTIMIZATION, Vol: 48, Pages: 1-32, ISSN: 0363-0129
  • Journal article
    Tanelli M, Osorio G, di Bernardo M, Savaresi SM, Astolfi Aet al., 2009,

    Existence, stability and robustness analysis of limit cycles in hybrid anti-lock braking systems

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 82, Pages: 659-678, ISSN: 0020-7179
  • Journal article
    Chang H, Astolfi A, 2009,

    Enhancement of the Immune Response to Chronic Myeloid Leukaemia via Controlled Treatment Scheduling

    , 2009 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-20, Pages: 3889-3892, ISSN: 1557-170X
  • Conference paper
    Moreno R, Konstantinidis V, Pudjianto D, Strbac Get al., 2009,

    The New Transmission Arrangements in the UK

    , General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 2797-2803, ISSN: 1944-9925
  • Conference paper
    Lopes AR, Shahzad A, Constantinides GA, Kerrigan ECet al., 2009,

    More FLOPS or More Precision? Accuracy Parameterizable Linear Equations Solvers for Model-Predictive Control
  • Conference paper
    Pin G, Parisini T, 2009,

    Stabilization of Networked Control Systems by Nonlinear Model Predictive Control: A Set Invariance Approach

    , International Workshop on Assessment and Future Directions of Nonlinear Model Predictive Control, Publisher: SPRINGER-VERLAG BERLIN, Pages: 195-204, ISSN: 0170-8643
  • Journal article
    Costa EF, Astolfi A, 2009,

    PARTIAL STABILITY FOR A CLASS OF NONLINEAR SYSTEMS

    , SIAM JOURNAL ON CONTROL AND OPTIMIZATION, Vol: 47, Pages: 3203-3219, ISSN: 0363-0129
  • Conference paper
    Zhang Z, Jaimoukha IM, 2009,

    Fault detection and isolation for linear discrete-time systems using input/output measurement analysis

    , IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 4908-4913, ISSN: 0191-2216

    In this work, a new approach to fault detection and isolation is proposed for linear discrete-time systems subject to faults and bounded additive disturbances using a system model, together with input/output measurements over a finite estimation horizon. We use the proposed method to compute upper and lower bounds on the faults. These bounds are the tightest possible given the system model, input/output measurements and the bounds on the initial state and disturbances. Linear programming optimization techniques are used to obtain the bounds. Moreover, a subsequent-state-estimation technique, together with an estimation horizon update procedure are given to allow the fault detection and isolation process to be repeated in an iterative procedure. Finally, the approach is verified using a numerical example.
  • Conference paper
    Li ZH, Zolotas A, Jaimoukha I, Grigoriadis Ket al., 2009,

    Integrated Design of Dynamic Controller with Fault Diagnosis and Tolerance

    , MEDITERRANEAN CONFERENCE ON CONTROL & AUTOMATION, Publisher: IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA, Pages: 694-699

    Fault detection capability tends to become an integral part of control system design procedures for practical engineering systems. It is thus desirable fault diagnosis/tolerance functions to also be included in the controller design. In this context, we develop a generic observer-based feedback controller where the observer-part can also generate a residual signal for fault detection purposes. The design objectives is a mixture of H-infinity, control and H-infinity, fault detection and isolation. This multi-objective optimization problem is then formulated using Bilinear Matrix In-equalities (BMI) and a sub-optimal solution is achieved via transformation to Linear Matrix Inequalities (LMI). The developed approach and algorithm are verified in study of an application to a railway suspension system of ride quality maintenance.
  • Conference paper
    Pin G, Parisini T, 2009,

    Networked Predictive Control of Constrained Nonlinear Systems: Recursive Feasibility and Input-to-State Stability Analysis

    , American Control Conference 2009, Publisher: IEEE, Pages: 2327-2334, ISSN: 0743-1619
  • Conference paper
    Chang H, Astolfi A, Shim H, 2009,

    Control of Infection Dynamics with Application to HIV/AIDS Model

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 3533-3538, ISSN: 0743-1546
  • Conference paper
    Astolfi A, Ortega R, Venkatraman A, 2009,

    A Globally Exponentially Convergent Immersion and Invariance Speed Observer for <i>n</i> Degrees of Freedom Mechanical Systems

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 6508-6513, ISSN: 0743-1546
  • Conference paper
    Ortner P, Astolfi A, 2009,

    Robust Observer Design for a Class of Nonlinear Systems using Filtering and Dynamic Scaling

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 6119-6124, ISSN: 0743-1546
  • Conference paper
    Acosta JA, Astolfi A, 2009,

    On the PDEs arising in IDA-PBC

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 2132-2137, ISSN: 0743-1546
  • Conference paper
    Costa EF, Astolfi A, 2009,

    Partial Stability for a Class of Nonlinear Systems

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 1068-1073, ISSN: 0743-1546
  • Conference paper
    Costa EF, Astolfi A, 2009,

    Bounds related to the Riccati difference equation for linear time varying systems

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 2321-2326, ISSN: 0743-1546
  • Conference paper
    Casagrande D, Sassano M, Astolfi A, 2009,

    A Hamiltonian approach to moments-based font recognition

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 5906-5911, ISSN: 0743-1546
  • Conference paper
    Shah D, Ortega R, Astolfi A, 2009,

    Speed and Load Torque Observer for Rotating Machines

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 6143-6148, ISSN: 0743-1546
  • Conference paper
    Casagrande D, Astolfi A, Ortega R, 2009,

    Asymptotic Stabilization of Passive Systems without Damping Injection: A Sampled Integral-Approximation Technique

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 4199-4203, ISSN: 0743-1546
  • Conference paper
    Andrieu V, Praly L, Astolfi A, 2009,

    Homogeneity in the bi-limit as a tool for observer and feedback design

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 1050-1055, ISSN: 0743-1546
  • Conference paper
    Casagrande D, Sassano M, Astolfi A, 2009,

    Estimation of the Dynamics of Two-Dimensional Clusters

    , American Control Conference 2009, Publisher: IEEE, Pages: 5428-+, ISSN: 0743-1619
  • Conference paper
    Bell KRW, Fenton W, Griffiths H, McDonald JR, Pal BCet al., 2009,

    The Power Academy in the UK: A Successful Initiative to Attract Graduates to the Power Industry

    , General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 2772-+, ISSN: 1944-9925
  • Conference paper
    Walton C, Green T, Woods T, 2008,

    Supergen futurenet and flexnet

    The paper outlines the work and conclusions of the four year Supergen FutureNet consortium of eight UK universities and many industrial sponsors that concluded in summer 2007. It then sets out the research program and objectives of the follow-on four year £7m FlexNet consortium and its implications for Smart Grids.

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