Damping Effects in Nonlinear Panel Flutter

Bismarck-Nasr, Maher N.; Bones, Carlos A.

doi:10.2514/2.1014

Cited by 14 publications

(1 citation statement)

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“…A few recent flat panel flutter investigations considered the viscoelastic characteristics of the constituent materials [34,[47][48][49][50]. Mathematically, a dissipation term is usually included in the governing differential equations to represent the dynamic behavior of the system [51].…”

Section: Introductionmentioning

confidence: 99%

Static/Dynamic Edge Movability Effect on Non-Linear Aerothermoelastic Behavior of Geometrically Imperfect Curved Skin Panel: Flutter and Post-Flutter Analysis

Abbas

Rui

Marzocca

et al. 2012

Journal of Applied Mechanics

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This paper addresses the problem of the aerothermoelastic modeling behavior and analyses of skin curved panels with static and dynamic edge movability effect in high supersonic fiow. Flutter and post-fiutter behavior will be analyzed toward determining under which conditions such panels will exhibit a benign instability, that is a stable limit cycle oscillation, or a catastrophic instability, that is an unstable LCO. The aerothermoelastic governing equations are developed from the geometrically non-linear theory of infinitely long two dimensional curved panels. Von Kármán non-linear strain-displacement relation in conjunction with the Kirchhoff plate-hypothesis is adopted. A geometrically imperfect curved panel forced by a supersonic/hypersonic unsteady flow is numerically investigated using Galerkin approach. These equations are based on the third-order piston theory aerodynamic for modeling the fiow-induced forces. Furthermore, the effects of thermal degradation and Kelvin's model of structural damping independent of time and temperature are also considered in this model. Computational analysis and discussion of the finding along with pertinent conclusions are presented.

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