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Aeroelasticity

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Earl H. Dowell – One of the best experts on this subject based on the ideXlab platform.

  • enhancement to least square based approach for time domain unsteady aerodynamic approximation
    Journal of Aircraft, 2020
    Co-Authors: Frederico Ribeiro, Earl H. Dowell, Douglas Domingues Bueno

    Abstract:

    The modeling of different problems in Aeroelasticity requires a time-domain equation of motion, especially to design modern controllers and study nonlinear characteristics. Typically, unsteady aero…

  • mathematical Aeroelasticity a survey
    Journal | MESA, 2015
    Co-Authors: Igor Chueshov, Earl H. Dowell, Irena Lasiecka, Justin T Webster

    Abstract:

    A variety of models describing the interaction between flows and oscillating structures are discussed. The main aim is to analyze conditions under which structural instability (flutter) induced by a fluid flow can be suppressed or eliminated. The analysis provided focuses on effects brought about by: (i) different plate and fluid boundary conditions, (ii) various regimes for flow velocities:subsonic, transonic, or supersonic, (iii) different modeling of the structure which may or may not account for in-plane accelerations (full von Karman system), (iv) viscous effects, (v) an assortment ofmodels related to piston-theoretic model reductions, and (iv) considerations of axial flows (in contrast to so called normal flows). The discussion below is based on conclusions reached via a combination of rigorous PDE analysis, numerical computations, and experimental trials.

  • Aeroelasticity in civil engineering
    , 2015
    Co-Authors: Earl H. Dowell

    Abstract:

    Fluid-structure interaction occurs in civil engineering applications to flexible long span bridges and tall slender buildings. This chapter provides an authoritative account of current best practices and modeling methods.

Philip S. Beran – One of the best experts on this subject based on the ideXlab platform.

  • Uncertainty Quantification in Aeroelasticity
    Annual Review of Fluid Mechanics, 2017
    Co-Authors: Philip S. Beran, Bret Stanford, Christopher R. Schrock

    Abstract:

    It is important to account for uncertainties in aeroelastic response when designing and certifying aircraft. However, aeroelastic uncertainties are particularly challenging to quantify, since dynamic stability is a binary property (stable or unstable) that may be sensitive to small variations in system parameters. To correctly discern stability, the interactions between fluid and structure must be accurately captured. Such interactions involve an energy flow through the interface, which if unbalanced, can destablize the structure. With conventional computational techniques, the consequences of imbalance may require large simulation times to discern, and evaluating the dependence of stability on numerous system parameters can become intractable. In this chapter, the challenges in quantifying aeroelastic uncertainties will be explored and numerical methods will be described to decrease the difficulty of quantifying aeroelastic uncertainties and increase the reliability of aircraft structures subjected to airloads. A series of aeroelastic analyses and reliability studies will be carried out to illustrate key concepts.

  • Computational Nonlinear Aeroelasticity
    , 2008
    Co-Authors: Philip S. Beran, Richard D. Snyder

    Abstract:

    Abstract : This report documents the culmination of in-house work in the area of computational modeling techniques for Aeroelasticity. At the project onset, emphasis was given to the challenge of predicting flutter points for aircraft in the transonic regime. Methods based on bifurcation theory and reduced order modeling were developed and tested. This work helped to shape the activity of the aeroelastic community, and an international workshop in the subject area to be held in 2008 testifies to this achievement. Attention then turned to studying vehicles that might experience large structural deformations, such as high-altitude vehicles. Finally, computational methods have been investigated for the exploitation of aeroelastic interactions in the design of micro-air vehicles.

Christopher R. Schrock – One of the best experts on this subject based on the ideXlab platform.

  • Uncertainty Quantification in Aeroelasticity
    Annual Review of Fluid Mechanics, 2017
    Co-Authors: Philip S. Beran, Bret Stanford, Christopher R. Schrock

    Abstract:

    It is important to account for uncertainties in aeroelastic response when designing and certifying aircraft. However, aeroelastic uncertainties are particularly challenging to quantify, since dynamic stability is a binary property (stable or unstable) that may be sensitive to small variations in system parameters. To correctly discern stability, the interactions between fluid and structure must be accurately captured. Such interactions involve an energy flow through the interface, which if unbalanced, can destablize the structure. With conventional computational techniques, the consequences of imbalance may require large simulation times to discern, and evaluating the dependence of stability on numerous system parameters can become intractable. In this chapter, the challenges in quantifying aeroelastic uncertainties will be explored and numerical methods will be described to decrease the difficulty of quantifying aeroelastic uncertainties and increase the reliability of aircraft structures subjected to airloads. A series of aeroelastic analyses and reliability studies will be carried out to illustrate key concepts.