Accession Number : ADA325525

Title :   Nonlinear Aeroelasticity of Composite Wings.

Descriptive Note : Final rept. 10 Jun 93-9 Dec 96,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIEN CE AND MECHANICS

Personal Author(s) : Nayfeh, A. H. ; Mook, D. T.

PDF Url : ADA325525

Report Date : 10 MAR 1997

Pagination or Media Count : 7

Abstract : We have developed a scheme that couples the codes for aerodynamic and aeroelastic analyses so that the flowfield and the positions and velocities of points on the lifting surface are predicted simultaneously and interactively. The actual structural dynamic/ aerodynamic coupling is carried out by representing the deflection of the wing as an expansion in terms of a few low-frequency free-vibration modes, especially the ones involved in internal resonances. The time dependent coefficients in this expansion are then regarded as tho generalized coordinates. The aerodynamic loads are also expanded in terms of the linear modes. Integration over the spatial domain reduces the problem to one of several degrees rf freedom governed by ordinary differential equations with generalized forces. An integration scheme is developed and applied to this set of equations.

Descriptors :   *AEROELASTICITY, *RESONANCE, *FLUTTER, *COMPOSITE WINGS, COUPLING(INTERACTION), TIME DEPENDENCE, DEFLECTION, FLOW FIELDS, NONLINEAR SYSTEMS, INTEGRATION, COEFFICIENTS, AERODYNAMIC LOADING, DIFFERENTIAL EQUATIONS, LIFTING SURFACES.

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE