The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform

Silviu-iulian Niculescu - One of the best experts on this subject based on the ideXlab platform.

  • On the stability of linear systems with uncertain delay
    IEEE Transactions on Automatic Control, 2003
    Co-Authors: V.l. Kharitonov, Silviu-iulian Niculescu
    Abstract:

    This note focuses on the stability of some class of delay systems, including uncertainty in the delays. More precisely, we are interested in guaranteeing the stability of perturbed delay systems by assuming the stability of the nominal system. If the delay perturbation is Constant, necessary and sufficient conditions are derived in terms of generalized eigenvalue distribution of some (finite-Dimensional) Constant matrix pencil. If the delay perturbation is time-varying, some sufficient stability conditions are derived using "exact" Lyapunov-Krasovskii functionals. Illustrative examples are also included.

  • On the stability of linear systems with uncertain delay
    2002
    Co-Authors: V.l. Kharitonov, Silviu-iulian Niculescu
    Abstract:

    This paper focuses on the stability of some class of delay systems including uncertainty in the delays. More precisely, we are interested in guaranteeing the stability of perturbed delay systems by assuming the stability of the nominal system. If the delay perturbation is Constant, necessary and sufficient conditions are derived in terms of generalized eigenvalue distribution of some (finite-Dimensional) Constant matrix pencil. If the delay perturbation is time-varying, some sufficient stability conditions are derived using 'exact' Lyapunov-Krasovskii functionals.

V.l. Kharitonov - One of the best experts on this subject based on the ideXlab platform.

  • On the stability of linear systems with uncertain delay
    IEEE Transactions on Automatic Control, 2003
    Co-Authors: V.l. Kharitonov, Silviu-iulian Niculescu
    Abstract:

    This note focuses on the stability of some class of delay systems, including uncertainty in the delays. More precisely, we are interested in guaranteeing the stability of perturbed delay systems by assuming the stability of the nominal system. If the delay perturbation is Constant, necessary and sufficient conditions are derived in terms of generalized eigenvalue distribution of some (finite-Dimensional) Constant matrix pencil. If the delay perturbation is time-varying, some sufficient stability conditions are derived using "exact" Lyapunov-Krasovskii functionals. Illustrative examples are also included.

  • On the stability of linear systems with uncertain delay
    2002
    Co-Authors: V.l. Kharitonov, Silviu-iulian Niculescu
    Abstract:

    This paper focuses on the stability of some class of delay systems including uncertainty in the delays. More precisely, we are interested in guaranteeing the stability of perturbed delay systems by assuming the stability of the nominal system. If the delay perturbation is Constant, necessary and sufficient conditions are derived in terms of generalized eigenvalue distribution of some (finite-Dimensional) Constant matrix pencil. If the delay perturbation is time-varying, some sufficient stability conditions are derived using 'exact' Lyapunov-Krasovskii functionals.

J. Dey - One of the best experts on this subject based on the ideXlab platform.

R. C. Sutcliffe - One of the best experts on this subject based on the ideXlab platform.

  • Surface resistance in atmospheric flow
    Quarterly Journal of the Royal Meteorological Society, 2007
    Co-Authors: R. C. Sutcliffe
    Abstract:

    The formula for surface resistance to atmospheric flow, F = ρκV2s, where Vs is the velocity of the surface wind, ρ the density, and κ a non-Dimensional Constant, was proposed by G. I. Taylor, on an analogy with flow in pipes. In pipes, the value of κ was 0.004, and Taylor gave a mean value of 0.0025 for κ in the case of flow of air over the ground. In this paper the value of κ was deduced from actual observed distributions of wind velocity at different heights, obtained by pilot balloons, no assumption being made as to the nature of eddy viscosity. The mean value of κ so deduced is 0.006 over land, and 0.0004 over the sea.

A. Prabhu - One of the best experts on this subject based on the ideXlab platform.

  • Laminar-turbulent transition modelling at IISc
    Journal of the Indian Institute of Science, 2013
    Co-Authors: J. Dey, O. N. Ramesh, M Jahanmiri, S V S Phani Kumar, A. Prabhu
    Abstract:

    An overview of laminar-turbulent transition zone modelling research at IISc is presented. The linear combination model based on the principle of combining mean laminar and turbulent profiles in proportions determined by the interminency has been found to provide an excellent representation of the transition zone in two-Dimensional incompressible boundary-layer flows. Ongoing investigations in a three-Dimensional Constant pressure flow with lateral Streamline divergence indicate that many transitional characteristics are similar to those in two- Dimensional Constant pressure flows for modelling purposes.

  • Transitional intermittency distribution pressure diverging flow in a three-Dimensional Constant
    1996
    Co-Authors: O. N. Ramesh, J. Dey, A. Prabhu
    Abstract:

    Intermittency measurements are made in the transition-zone of a three-Dimensional Constant pressure diverging flow in order to study the effect of lateral strain rate on the intermittency distribution. Measured intermittency data are found to follow the two-Dimensional behaviour thus indicating that the lateral strain rate does not affect the normalised intermittency distribution in the transition zone.

  • Transitional intermittency distribution in a three-Dimensional Constant pressure diverging flow
    Experiments in Fluids, 1996
    Co-Authors: O. N. Ramesh, J. Dey, A. Prabhu
    Abstract:

    Intermittency measurements are made in the transition-zone of a three-Dimensional Constant pressure diverging flow in order to study the effect of lateral strain rate on the intermittency distribution. Measured intermittency data are found to follow the two-Dimensional behaviour thus indicating that the lateral strain rate does not affect the normalised intermittency distribution in the transition zone.