Intrinsic models for nonlinear flexible-aircraft dynamics using industrial finite-element and loads packages
File(s)
Submitted version
Author(s)
Palacios, R
Wang, Y
Karpel, M
Type
Conference Paper
Abstract
A procedure is introduced to construct 1-D geometrically-nonlinear structural dynam- ics models from built-up 3-D finite-element solutions. The nonlinear 1-D model is based on an intrinsic form of the equations of motion, that uses beam velocities and internal forces as primary degrees of freedom. It is further written in modal form, which yields a description of the beam dynamics through ordinary differential equations with quadratic non-linearities. We show that the evaluation of the coeficients in these nonlinear equa- tions of motion does not require the generation of a beam finite-element model. Instead, they are directly identified in the 3-D model through a process of static condensation of the dynamics on nodes defined along along spanwise stations, as it is done in aircraft dy- namic load analysis. In fact, the method exploits the multi-point constraints of linear load models, that are normally used to obtain sectional loads, and we show how it can be inte- grated in full-vehicle aeroelastic analysis. Finally we illustrate this approach on an isotropic cantilever box beam modelled using shell elements. © 2012 by Rafael Palacios, Yinan Wang and Moti Karpel.
Version
Submitted version
Date Issued
2012-04
Citation
2012
Source Title
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, USA
Copyright Statement
© The Authors
Source
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, USA
Publication Status
Published
Start Date
2012-04-23
Finish Date
2012-04-26