Aeroelastic analysis of a low aspect ratio wing

Rajagopal, P and Vittala, NGV and Ramani, TS (1990) Aeroelastic analysis of a low aspect ratio wing. Journal of Aeronautical Society of India, 42 . pp. 51-56.

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Abstract

Analytical predictions of aeroelastic behavior like flutter and divergence of a typical wing configuration are presented in this paper. To facilitate the calculation of steady or unsteady airloads,the modal data of the wing configuration in the form of a limited number of low frequency mode shapes and their associated generalized masses and stiffnesses are generated using CSA /NASTRAN. Unsteady airloads required to perform flutter analysis are evaluated for a set of natural modes using piston theory. The flutter model formulated combining the structural and aerodynamic models is solved using KE method available in CSA/NASTRAN. Critical flutter Mach number and flutter frequencies are calculated from the condition that the damping of the whole system should be zero. To calculate steady air load in the supersonic regime, the normal mode shapes are expressed in the form of polynomials. Then the divergence equation, formulated by combining the steady airload and stiffness matrix, is solved as an eigenvalue problem to obtain the divergence Mach number for the wing.

Item Type: Journal Article
Uncontrolled Keywords: Mathematical models;Vibration;Aircraft;Wings(aircraft); Aeronautics;Stiffness;Aeroelasticity;Combining;Eigenvalues; Damping;Aerodynamics;Aspect ratio;Pistons;Supersonic aircraft;Divergence;Dynamic structural analysis;Flutter analysis;Low aspect ratio wings
Subjects: AERONAUTICS > Aeronautics (General)
Division/Department: Structures Division, Structures Division, Structures Division
Depositing User: M/S ICAST NAL
Date Deposited: 27 Mar 2008
Last Modified: 24 May 2010 09:55
URI: http://nal-ir.nal.res.in/id/eprint/4454

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