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  • Conference paper
    Angeli D, 2009,

    A Tutorial on Chemical Reaction Network Dynamics

    , 10th European Control Conference, Publisher: ELSEVIER, Pages: 398-406, ISSN: 0947-3580
  • Journal article
    Lin D, Yan W, Zissis G, Hui SYRet al., 2009,

    A simple physical low pressure discharge lamp model

    , 2009 IEEE Energy Conversion Congress and Exposition Ecce 2009, Pages: 2051-2058

    A simple physical low pressure discharge lamp model has been proposed in this paper. The new model is based on the physical processes inside a fluorescent lamp by considering the increasing rate of electron density and the ambipolar diffusion process. The model can accurately predict not only the lamp electrical terminal characteristics but also the electron density and electron temperature inside the fluorescent lamp. The results are comparable with the predictions from the complicated plasma models. The simple lamp model can accurately predict the lamp characteristics at both high and low operating frequencies, and the voltage spikes caused by arc re-ignition at each half cycle when the lamp is operated at mains frequency. This model can be easily implemented into MATLAB/Simulink as a simple, accurate and user-friendly CAD tool. © 2009 IEEE.
  • Journal article
    Qin YX, Lin DY, Chung HSH, Yan W, Hui SYRet al., 2009,

    Dynamic control of a light-emitting diode system based on the general photo-electro-thermal theory

    , 2009 IEEE Energy Conversion Congress and Exposition Ecce 2009, Pages: 2815-2820

    This paper presents a dynamic thermal model of a LED system and a control strategy for optimal power point tracking (OPPT). The control strategy is based on the general theory which links the photometric, electric and thermal behaviors of LEDs together. The control implementation enables the optimal operating of the LED systems to be determined dynamically. By measuring the ambient temperature and the heatsink temperature of LED system, the proposed control scheme allows the LED system to operate at the optimal dynamic operating points at which maximum luminous flux is generated. Practical tests have been carried out to verify the model and the general theory. © 2009 IEEE.
  • Journal article
    Tan Y, Nesic D, Mareels IMY, Astolfi Aet al., 2009,

    On global extremum seeking in the presence of local extrema

    , AUTOMATICA, Vol: 45, Pages: 245-251, ISSN: 0005-1098
  • Journal article
    Angeli D, Sontag ED, 2009,

    Oscillations in I/O Monotone Systems Under Negative Feedback

    , IEEE T AUTOMAT CONTR, Pages: 166-176, ISSN: 0018-9286

    Oscillatory behavior is a key property of many biological systems. The small-gain theorem (SGT) for input/output monotone systems provides a sufficient condition for global asymptotic stability of an equilibrium, and hence its violation is a necessary condition for the existence of periodic solutions. One advantage of the use of the monotone SGT technique is its robustness with respect to all perturbations that preserve monotonicity and stability properties of a very low-dimensional (in many interesting examples, just one-dimensional) model reduction. This robustness makes the technique useful in the analysis of molecular biological models in which there is large uncertainty regarding the values of kinetic and other parameters. However, verifying the conditions needed in order to apply the SGT is not always easy. This paper provides an approach to the verification of the needed properties and illustrates the approach through an application to a classical model of circadian oscillations, as a nontrivial "case study," and provides a theorem in the converse direction of predicting oscillations when the SGT conditions fail.
  • Journal article
    Jabr RA, Pal BC, 2009,

    Intermittent Wind Generation in Optimal Power Flow Dispatching

    , IET Generation, Transmision and Distribution, Vol: 3, Pages: 66-74
  • 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
    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-+
  • 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
    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
    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, 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
    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, 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
    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
    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
    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
    • Cite
    • Citations: 13
  • 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
    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
    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
  • Journal article
    Hui SYR, Qin YX, 2009,

    A General Photo-Electro-Thermal Theory for Light Emitting Diode (LED) Systems

    , APEC: 2009 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, VOLS 1- 4, Pages: 554-562, ISSN: 1048-2334
    • Cite
    • Citations: 11
  • Journal article
    Lee LM, Hui SYR, 2009,

    Automatic Lamp Detection and Operation for Warm-Start Tubular Fluorescent Lamps

    , APEC: 2009 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, VOLS 1- 4, Pages: 1518-1525, ISSN: 1048-2334
  • Journal article
    Qin YX, Lin DY, Hui SYR, 2009,

    A Simple Method for Comparative Study on the Thermal Performance of Light Emitting Diodes (LED) and Fluorescent Lamps

    , APEC: 2009 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, VOLS 1- 4, Pages: 152-158, ISSN: 1048-2334
    • Cite
    • Citations: 13
  • Journal article
    Lin DY, Yan W, Hui SYR, Qin YXet al., 2009,

    An Improved Semi-theoretical Fluorescent Lamp Model for Dimmable Applications

    , APEC: 2009 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, VOLS 1- 4, Pages: 819-825, ISSN: 1048-2334
  • 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.

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