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  • Conference paper
    Childs PRN, Long CA, Turner AB, 1995,

    A review of convective heat transfer in open and closed rotating annular cavities

    , 4th UK National Conference on Heat Transfer, Publisher: MECHANICAL ENGINEERING PUBL, Pages: 67-71, ISSN: 1356-1448
  • Conference paper
    TERWIESCH P, ASTOLFI A, 1995,

    Approximate H infinity end-point optimization for nonlinear dynamic processes

    , 1995 American Control Conference, Publisher: AMER AUTOMATIC CONTROL COUNCIL, Pages: 1762-1766
  • Conference paper
    ASTOLFI A, 1995,

    Exponential stabilization of a car-like vehicle

    , 1995 IEEE International Conference on Robotics and Automation, Publisher: I E E E, Pages: 1391-1396, ISSN: 1050-4729
    • Cite
    • Citations: 23
  • Conference paper
    Astolfi A, 1995,

    On the relation between state feedback and full information regulators in H infinity control

    , 34th IEEE Conference on Decision and Control, Publisher: I E E E, Pages: 327-332
  • Conference paper
    Astolfi A, 1994,

    Adaptive compensation of nonlinear time varying torque disturbance in rigid robots

    , Pages: 297-302

    This paper presents a new approach to the control of rigid robots when actuator dynamics and nonlinearities (e.g. saturation), Coulumb friction, ... are relevant. An adaptive like algorithm is used in order to obtain desired trajectory tracking in the presence of unknown, non linear, time varying torque disturbances acting on the robot.
  • Conference paper
    Astolfi A, 1994,

    Singular H∞ control

    , Pages: 2543-2548, ISSN: 0191-2216

    The present paper presents a solution to the singular H∞ control problem via state feedback for a class of nonlinear systems. It is shown that the problem of almost disturbance decoupling with stability plays a fundamental role in the solution of the considered problem. We also point out when the singular problem can be reduced to a regular one or solved via standard H<inf>∞</inf> technique. We must stress that the solution of the singular problem is obtained without making any approximation of it by regular problems, i.e. via the so called cheap control. The latter is used to provide a solution to the general H<inf>∞</inf> control problem, i.e. when no assumptions are made on the zero dynamic of the system.
  • Conference paper
    Basualdo MS, Calvo RA, Ceccatto HA, 1994,

    Neural control strategies of a binary distillation column

    , Pages: 77-81

    The ability of neural networks to model arbitrary nonlinear functions and their inverses is exploited for the adaptive control of nonlinear systems. Neural networks which model the plant and its inverse are directly incorporated within the internal model control structure. In addition, a test was made with the open loop control using only the neural model of the plant inverse. Finally, combined structures of conventional controllers (P, PD) with this inverse model were implemented in order to improve the performance of the controlled system. The potential of the proposed methods is demonstrated using the control of the top of a continuous Benzene-Toluene distillation column as an example. The dynamic behavior of that system is obtained by using a complex software simulation.
  • Conference paper
    Bayley FJ, Childs PRN, 1994,

    Air temperature rises in compressor and turbine stator wells

    , Pages: 1-10, ISSN: 0402-1215

    This paper considers the fluid dynamic principles determining the consequences of mainstream fluid ingressing to the comparatively shallow space between the rotor disc and the ring used in many designs of axial-flow turbo-machine, especially compressors, to support the stator blades at their inner ends. Windage power due to friction between this fluid and the bounding walls of this annular space, or 'stator well', can lead to substantial temperature rises in this region. The feasible range of flow regimes is first developed, especially as influenced by leakage through the internal seals beneath the stators separating adjacent wells. Using published data, on windage coefficients and the effects of geometry on the flow through the wells, very little of which has been obtained from truly representative flow conditions or geometries, calculations have been made to estimate the likely rises in temperature to be anticipated in realistic well designs. Leakage rates appear, not unexpectedly, to be crucial in determining these temperature rises, but the geometries of the system are little less critical, in particular the ratio of the outer to inner radiuses of the stator well and the outer peripheral clearances between rotor and stator surfaces. Leakage into a well from its adjacent neighbour is shown to lead to higher temperature rises downstream of the labyrinth seal and the possible effects of recirculation through stator wells from the mainstream boundary layer could be significant.
  • Conference paper
    Bayley FJ, Childs PRN, 1994,

    Air temperature rises in compressor and turbine stator wells. ASME Paper 94-GT-185

    , ASME Turbo Expo 1994, Publisher: ASME
  • Conference paper
    CHILDS PRN, TURNER AB, 1994,

    HEAT TRANSFER ON THE SURFACE OF A CYLINDER ROTATING IN AN ANNULUS AT HIGH AXIAL AND ROTATIONAL REYNOLDS NUMBERS

    , 10th International Heat Transfer Conference, Publisher: INST CHEMICAL ENGINEERS, Pages: 13-18
  • Conference paper
    DELRE L, GORANSSON A, ASTOLFI A, 1994,

    ENHANCING HYDROSTATIC GEAR EFFICIENCY THROUGH NONLINEAR OPTIMAL-CONTROL STRATEGIES

    , 3rd IEEE Conference on Control Applications, Publisher: I E E E, Pages: 403-408
  • Conference paper
    ASTOLFI A, LANARI L, 1994,

    DISTURBANCE ATTENUATION AND SET-POINT REGULATION OF RIGID ROBOTS VIA H infinity CONTROL

    , 33rd IEEE Conference on Decision and Control, Publisher: I E E E, Pages: 2578-2583, ISSN: 0191-2216
    • Cite
    • Citations: 16
  • Conference paper
    ASTOLFI A, 1994,

    SINGULAR H infinity CONTROL

    , 33rd IEEE Conference on Decision and Control, Publisher: I E E E, Pages: 2543-2548, ISSN: 0191-2216
  • Conference paper
    ASTOLFI A, 1994,

    ON THE STABILIZATION OF NONHOLONOMIC SYSTEMS

    , 33rd IEEE Conference on Decision and Control, Publisher: I E E E, Pages: 3481-3486, ISSN: 0191-2216
    • Cite
    • Citations: 43
  • Conference paper
    KRAUS F, GUZZELLA L, ASTOLFI A, TEMPO Ret al., 1993,

    INVARIANT ROOTS OF POLYNOMIALS WITH UNCERTAIN COEFFICIENTS

    , 32nd IEEE Conference on Decision and Control, Publisher: I E E E, Pages: 498-501
  • Journal article
    ISIDORI A, ASTOLFI A, 1992,

    DISTURBANCE ATTENUATION AND H-INFINITY-CONTROL VIA MEASUREMENT FEEDBACK IN NONLINEAR-SYSTEMS

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 37, Pages: 1283-1293, ISSN: 0018-9286
    • Cite
    • Citations: 584
  • Conference paper
    Childs PRN, Turner AB, Vaughan CM, Rayner D, Bayley FJet al., 1992,

    Heat Transfer to a Rotating Drum in an Annulus With a Stator Blade Row and Axial Throughflow

    , ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition, Publisher: American Society of Mechanical Engineers

    <jats:p>This paper describes an experimental and numerical investigation of heat transfer to a rotor drum rotating in an annulus with an axial throughflow of air. The application of the work is principally to the transient heating of axial compressor rotor drums, and the results obtained extend the range of previously published correlations by an order of magnitude. Rotational Reynolds numbers (Reω = ωri2/ν) up to 1.5 × 106 and axial Reynolds numbers (ReD = uaDh/ν, Dh = 2(ro – ri)) up to 3.7 × 105 have been achieved experimentally.</jats:p> <jats:p>A new experimental facility is described in which a 400mm diameter rotor drum, instrumented with miniature thermopile type heat flux meters and thermocouples, can be air turbine driven at up to 10000rpm. The drum rotates in an annulus with a gap of 30mm in which complete rows of stator vanes can be mounted to enable the effect of vane/rotor drum clearance to be examined. A correlation for the heat transfer between the rotor drum and a stator blade row is presented for varying axial and rotational Reynolds numbers and blade/rotor drum radial clearance.</jats:p>
  • Conference paper
    Childs PRN, Turner AB, Vaughan CM, Rayner D, Bayley FJet al., 1992,

    Heat transfer to a rotating drum in an annulus with a stator blade row and axial throughflow. ASME Paper 92-GT-249

    , ASME Turbo Expo 1992, Publisher: ASME
  • Conference paper
    Childs PRN, Rayner D, Turner AB, 1992,

    Heat transfer to a cylindrical drum rotating in an annulus under a single stator blade row

    , International Centre for Heat and Mass Transfer, International Symposium, Heat Transfer in Turbomachinery
  • Conference paper
    Rayner D, Vaughan CM, Childs PRN, Turner ABet al., 1992,

    Numerical simulation of the heat transfer in turbulent, swirling annular flows

    , Advanced Computational Methods in Heat Transfer II, Pages: 511-531
  • Journal article
    PINSON P, VANDERSTRAETEN M, 1991,

    FIBROTIC STAGE OF ALLERGIC BRONCHOPULMONARY CANDIDIASIS

    , CHEST, Vol: 100, Pages: 565-567, ISSN: 0012-3692
  • Thesis dissertation
    Childs PRN, 1991,

    Heat Transfer at the surface of a cylinder rotating in an annulus with a stator blade row and axial throughflow
  • Conference paper
    McGlashan NR, Childs PRN, Heyes AL,

    Chemical looping combustion using the direct combustion of liquid metal in a gas turbine based cycle. GT2010-23393

    , ASME Turbo Expo 2010

    A combined cycle gas turbine generating power and hydrogen is proposed and evaluated. The cycle embodies chemical looping combustion (CLC) and uses a Na based oxygen carrier. In operation, a stoichiometric excess of liquid Na is injected directly into the combustion chamber of a gas turbine cycle, where it is burnt in compressed O2 produced in an external air separation unit (ASU). The resulting combustion chamber exit stream consists of hot Na vapour, and this is expanded in a turbine. Liquid Na2O oxide is also generated in the combustion process, but this can be separated, readily, from the Na vapour and collects in a pool at the bottom of the reactor.To regenerate liquid Na from Na2O, and hence complete the chemical loop, a reduction reactor (the reducer) is fed with three streams: the hot Na2O from the oxidiser; the Na vapour (plus some entrained wetness) exiting a Na-turbine; and a stream of solid fuel, which is assumed to be pure carbon for simplicity. The sensible heat content of the liquid Na2O and latent and sensible heat of the Na vapour provide the heat necessary to drive the endothermic reduction reaction and ensure the reducer is externally adiabatic. The exit gas from the reducer consists of almost pure CO which can be used to generate by-product H2 using the water-gas shift reaction.A mass and energy balance of the system is conducted assuming reactions reach equilibrium. The analysis allows for losses associated with turbomachinery; heat exchangers are assumed to operate with a finite approach temperature; however, pressure losses in equipment and pipework are assumed negligible - a reasonable assumption for this type of analysis that will still yield meaningful data. The analysis confirms that the combustion chamber exit temperature is limited by both first and second law considerations to a value suitable for a practical gas turbine. The analysis also shows that the overall efficiency of the cycle, under optimum conditions and taking into account t
  • Journal article
    Boyle DE, Yates DC, Yeatman EM,

    Urban Sensor Data Streams: London 2013

    , IEEE INTERNET COMPUTING, Vol: 17, Pages: 12-20, ISSN: 1089-7801
  • Journal article
    Boyle D, Kolcun R, Yeatman E,

    DEVICES IN THE INTERNET OF THINGS

    , JOURNAL OF THE INSTITUTE OF TELECOMMUNICATIONS PROFESSIONALS, Vol: 9, Pages: 27-31, ISSN: 1755-9278
  • Conference paper
    Caputo C, Cardin M-A,

    An Approach to Analyze Flexibility in Engineering Systems Design based on Reinforcement Learning and Decision Rules
  • Conference paper
    Caputo C, Cardin M-A,

    An Approach to Analyze Flexibility in Engineering Systems Design based on Reinforcement Learning and Decision Rules
  • Other
    Childs PRN,

    Temperature Measurement

    , Publisher: Wiley

    <jats:title>Abstract</jats:title><jats:p>The requirement to measure temperature arises in process control, production, environmental observation, and laboratory research. The range of techniques available for measuring temperature is extensive. Many phenomena are dependent on temperature and this can be exploited in instrumentation. A given application may permit direct contact between a measuring device or system and the medium of interest. Alternatively remote observation of, for example, infrared radiation or fluorescence may be possible using an optical system. This chapter outlines various forms of invasive, semi‐invasive, and noninvasive temperature measurement devices and systems. In addition, this chapter describes the fundamental definitions of temperature and the issues that need to be considered in determining the temperature of a given medium, be it a solid body, surface, liquid, or gas.</jats:p>
  • Journal article
    Goncalves C, Bessa RJ, Pinson P,

    A critical overview of privacy-preserving approaches for collaborative forecasting (vol 37, pg 322, 2021)

    , INTERNATIONAL JOURNAL OF FORECASTING, Vol: 37, Pages: 1322-1322, ISSN: 0169-2070
  • Journal article
    PINSON P, JOOS G, PRAET M, PAUWELS Ret al.,

    PRIMARY PULMONARY HODGKINS-DISEASE

    , RESPIRATION, Vol: 59, Pages: 314-316, ISSN: 0025-7931

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