Accession Number : ADA309222

Title :   Flutter Analysis and Analytic Sensitivities for Trapezoidal Panels.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Mineau, David

PDF Url : ADA309222

Report Date : 1996

Pagination or Media Count : 96

Abstract : Explicit expressions for the stiffness, geometric stiffness, mass, and aerodynamic force matrices are derived for the flutter analysis of simply supported composite wing panels. The formulation is based on Ritz analysis using simple polynomials and Piston Theory aerodynamics. The use of simple polynomials eliminates the need for numerical quadrature and decreases computation time. Analytic sensitivities of the aeroelastic system matrices and critical dynamic pressures are obtained with respect to layer thickness, fiber direction, and panel shape. The method is integrated with wing box analysis based on either the equivalent plate approach or finite element method, making it possible to obtain sensitivities of the stability boundary with respect to wing planform shape or locations of ribs and spars. The analytic sensitivities are used to construct approximations of the aeroelastic stability boundary for integrated wing/panel design synthesis, finite element method, making it possible to obtain sensitivities of the stability boundary with respect to wing planform shape or locations of ribs and spars. The analytic sensitivities are used to construct approximations of the aeroelastic stability boundary for integrated wing/panel design synthesis.

Descriptors :   *AEROELASTICITY, *AERODYNAMIC LOADING, *FLUTTER, *COMPOSITE WINGS, STRESS STRAIN RELATIONS, MATHEMATICAL MODELS, LOAD DISTRIBUTION, OPTIMIZATION, EQUATIONS OF MOTION, STRESS ANALYSIS, AERODYNAMIC STABILITY, MATRICES(MATHEMATICS), FINITE ELEMENT ANALYSIS, STRUCTURAL ANALYSIS, STRUCTURAL MECHANICS, STIFFNESS, DAMPING, THESES, APPROXIMATION(MATHEMATICS), NUMERICAL INTEGRATION, POLYNOMIALS, PARTIAL DIFFERENTIAL EQUATIONS, MACH NUMBER, SUPERSONIC FLOW, SKIN(STRUCTURAL), DYNAMIC PRESSURE, AERODYNAMICS, WING BOXES.

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE