Dynamic aeroelastic subsonic discrete gust response analysis of lifting surfaces in time domain using Newark's method.

Manjuprasad, M and Sathish, B S and Viswanath, S (2007) Dynamic aeroelastic subsonic discrete gust response analysis of lifting surfaces in time domain using Newark's method. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    Abstract

    The Dynamic gust response analysis of lifting surfaces of aerospace structures requires attention to two main factors, namely, the character of the gust and the aeroelastic effects. In the present work,the Dynamic aeroelastic response of subsonic airplane in discrete gusts is determined using Newmark's direct integration method.The adopted time domain method is a departure from the usual modal analysis and the frequency domain approach.The aerodynamic strip theory is assumed,but compressibility and aspect ratio corrections may be included,if desired.The method has been validated by performing discrete gust response analysis of an airfoil model of the elastic wing flying through sharp-edged gust.The unsteady aerodynamic forces on the wing are calculated from the theory of two-dimensional thin airfoils in non-uniform motion.The theory takes proper account of 'unsteadiness' by using the kussner's and Wagner's unsteady lift functions for calculating the aerodynamic forces.The pitching motion and tail effects are neglected.For validating the present work,the responses obtained from Newmark's method is compared with those reported in literature using Laplace method.It is found that the results are in close agreement with reported in the literature.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Aerodynamic force;Elastic force;Intertial force;Gust load models;Extended aerodynamic equations,Newmark's direct integration method
    Subjects: ENGINEERING > Structural Mechanics
    AERONAUTICS > Aerodynamics
    Division/Department: Structures Division, Structures Division, Structures Division
    Depositing User: M/S ICAST NAL
    Date Deposited: 16 Jan 2009
    Last Modified: 17 Jun 2010 10:36
    URI: http://nal-ir.nal.res.in/id/eprint/4651

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