A Geometrically Nonlinear Structural Model For Aerostructural Optimization of Ultra-High Aspect Ratio Composite Wings

2022 ◽  
Author(s):  
Morteza Abouhamzeh ◽  
Yiyuan Ma ◽  
Ali Elham
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Structural Model ◽  
Geometrically Nonlinear ◽  
Nonlinear Structural ◽  
Aerostructural Optimization

Linear and Nonlinear Aeroelastic Analysis of a High Aspect Ratio Wing

2017 ◽  
Author(s):  
F. Bakhtiari-Nejad ◽  
A. H. Modarres ◽  
E. H. Dowell ◽  
H. Shahverdi
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Structural Model ◽  
State Space Model ◽  
Beam Model ◽  
Aeroelastic Analysis ◽  
Structural Nonlinearities ◽  
Flutter Boundary ◽  
Linear And Nonlinear ◽  
Perturbation Equations

In this study, analysis and results of linear and nonlinear aeroelastic of a cantilever beam subjected to the airflow as a model of a high aspect ratio wing are presented. A third-order nonlinear beam model is used as structural model to take into account the effects of geometric structural nonlinearities. In order to model aerodynamic loads, Wagner state-space model has been used. Galerkin method is implemented to solve dynamic perturbation equations about a nonlinear static equilibrium state. The small perturbation flutter boundary is determined by these perturbation equations. The effect of geometric structural nonlinearity of the beam model on the flutter behavior is significant. As it is observed the system’s response to upper speed of flutter goes to limit cycle oscillations and also the oscillations lose periodicity and become chaotic.

scholarly journals Sizing High-Aspect-Ratio Wings with a Geometrically Nonlinear Beam Model

2019 ◽  
Vol 56 (4) ◽  
pp. 1455-1470 ◽  
Author(s):  
D. E. Calderon ◽  
J. E. Cooper ◽  
M. Lowenberg ◽  
S. A. Neild ◽  
E. B. Coetzee
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Beam Model ◽  
Geometrically Nonlinear ◽  
Nonlinear Beam

scholarly journals Aeroelastic Modeling and Analysis of High Aspect Ratio Wings With Different Fidelity Structural Models

2019 ◽  
Author(s):  
Gökçen Çiçek ◽  
Altan Kayran
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Structural Model ◽  
Structural Models ◽  
Element Model ◽  
Modeling And Analysis ◽  
Aeroelastic Analysis ◽  
Lifting Surfaces ◽  
Nonlinear Finite Element Model

Abstract This paper is concerned with the aeroelastic modeling and analysis of high aspect ratio wings with large torsional deflections with different fidelity structural models. The approach for structural modeling presented here is based on linear and nonlinear theories. The linear theories are based on the slender-straight wing and bending-torsion beam finite element formulations. The nonlinear theory is based on the nonlinear finite element model with only a torsional rotation degree of freedom to study the static aeroelastic behavior. The aerodynamic theory used for aeroelastic coupling is ESDU 95010 [1], which uses steady lifting-surface theory based on Multhopp-Richardson’s solution to provide the spanwise loading of lifting surfaces with camber and twist. Analyses are performed with three different structural models coupled with ESDU for simple plate-like wing models. The results of linear structural models are verified with MSC NASTRAN® and the nonlinear structural model results are verified with the work of Trahair [2]. Linear aeroelastic models are compared with the MSC NASTRAN® solution performed by SOL144. Significant differences in torsional deflection of tip location are observed between the linear and the nonlinear solution methodologies. The linear theory is found to be conservative for the aeroelastic analysis of high aspect ratio wings.

Limit Cycle Flutter Analysis of a High-Aspect-Ratio Wing with an External Store

2014 ◽  
Vol 912-914 ◽  
pp. 907-910 ◽  
Author(s):  
Jun Xu ◽  
Xiao Ping Ma
Keyword(s):  
Aspect Ratio ◽  
Limit Cycle ◽  
High Aspect Ratio ◽  
Structural Model ◽  
Bifurcation Diagrams ◽  
Governing Equations ◽  
Time Simulation ◽  
Flutter Analysis ◽  
Structural Nonlinearities ◽  
Limit Cycle Flutter

Limit cycle flutter analysis of a high-aspect-ratiowing with an external store is presented. The concentrated store mass iscombined into the governing equations which are obtained using the extendedHamilton’s principle. The high-aspect-ratio wing structural model, which alsoconsiders the in-plane bending motion, is used. Three possible nonlinearitiesare considered including structural nonlinearities, aerodynamic nonlinearities,and store nonlinearities. Time simulation and bifurcation diagrams areperformed to analysis systems with three nonlinearities.

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