aeroelasticity


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aeroelasticity

[‚e·rō·i‚las′tis·əd·ē]
(mechanics)
The deformation of structurally elastic bodies in response to aerodynamic loads.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Aeroelasticity

The branch of applied mechanics which deals with the interaction of aerodynamic, inertial, and structural forces. It is important in the design of airplanes, helicopters, missiles, suspension bridges, power lines, tall chimneys, and even stop signs. Variations on the term aeroelasticity have been coined to denote additional significant interactions. Aerothermoelasticity is concerned with effects of aerodynamic heating on aeroelastic behavior in high-speed flight. Aeroservoelasticity deals with the interaction of automatic controls and aeroelastic response and stability. In the field of hydroelasticity, a liquid rather than air generates the fluid forces.

The primary concerns of aeroelasticity include flying qualities (that is, stability and control), flutter, and structural loads arising from maneuvers and atmospheric turbulence. Methods of aeroelastic analysis differ according to the time dependence of the inertial and aerodynamic forces that are involved. For the analysis of flying qualities and maneuvering loads wherein the aerodynamic loads vary relatively slowly, quasi-static methods are applicable, although autopilot interaction could require more general methods. The remaining problems are dynamic, and methods of analysis differ according to whether the time dependence is arbitrary (that is, transient or random) or simply oscillatory in the steady state.

The redistribution of airloads caused by structural deformation will change the lifting effectiveness on the aerodynamic surfaces from that of a rigid vehicle. The simultaneous analysis of the equilibrium and compatibility among the external airloads, the internal structural and inertial loads, and the total flow disturbance, including the disturbance resulting from structural deformation, leads to a determination of the equilibrium aeroelastic state. If the airloads tend to increase the total flow disturbance, the lift effectiveness is increased; if the airloads decrease the total flow disturbance, the effectiveness decreases.

The airloads induced by means of a control-surface deflection also induce an aeroelastic loading of the entire system. Equilibrium is determined as in the analysis of load redistribution. Again, the effectiveness will differ from that of a rigid system, and may increase or decrease depending on the relationship between the net external loading and the deformation.

A self-excited vibration is possible if a disturbance to an aeroelastic system gives rise to unsteady aerodynamic loads such that the ensuing motion can be sustained. At the flutter speed a critical phasing between the motion and the loading permits extraction of an amount of energy from the airstream equal to that dissipated by internal damping during each cycle and thereby sustains a neutrally stable periodic motion. At lower speeds any disturbance will be damped, while at higher speeds, or at least in a range of higher speeds, disturbances will be amplified.

Transient meteorological conditions such as wind shears, vertical drafts, mountain waves, and clear air or storm turbulence impose significant dynamic loads on aircraft. So does buffeting during flight at high angles of attack or at transonic speeds. The response of the aircraft determines the stresses in the structure and the comfort of the occupants. Aeroelastic behavior makes a condition of dynamic overstress possible; in many instances, the amplified stresses can be substantially higher than those that would occur if the structure were much stiffer. See Transonic flight

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.

aeroelasticity

This branch of mechanics is concerned with the mutual interaction between aerodynamic loads and structural deformation. The primary concerns of aeroelasticity include flying qualities (i.e., stability and control, flutter, aileron buzz, and structural loads arising from maneuvers and atmospheric turbulence).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Hood, Aeroelasticity, Fluid-structure interaction, Computational fluid dynamics, Wind tunnel testing
In fact, in spite of a better maneuverability at high AOA (Angle Of Attack), the FSW is characterized by a significant directional instability about the yaw axis, is subject to aeroelasticity issues at the wing tip, and is pretty unstable in stall conditions.
The classical approach used in aeroelasticity for loads and flutter analyses solves the equations of motion in the frequency domain.
They cover the seismic behavior of structures, aeroelasticity, thermo-mechanics and fire resistance, structure-subgrade interaction, optimizing structures, life span and safety, failure and damage to structures, and diagnostics and experimental analysis.
Hodges is a Professor of Aerospace Engineering at the Georgia Institute of Technology and an internationally recognized authority in the areas of dynamics, structural dynamics, structural mechanics, computational mechanics, and aeroelasticity. He has made fundamental contributions in the areas of nonlinear deformation of rotor blades; flexible multi-body dynamics; finite element schemes for aeroelastic stability; plate and shell dynamics and asymptotically exact theories for anisotropic structures.
This complete aeroservoelastic model is obtained joining two submodels: (i) the flight dynamic model, that describes the rigid body motion of the aircraft, and (ii) the aeroelastic model, which is responsible for the aircraft aeroelasticity. Hypothesis of small disturbances from a steady flight condition allows linearizing the rigid body equations of motion [10] and uncoupling the longitudinal plane response from the lateral one.
Kareem, "Aerodynamics and aeroelasticity of cable-supported bridges: identification of nonlinear features," Journal of Engineering Mechanics, vol.
Pettit summarized the results and advances about uncertainty quantification in aeroelasticity [1] extensively.
The topic of integrodifferential equations (IDEs) which has attracted growing interest for some time has been recently developed in many applied fields, so a wide variety of problems in the physical sciences and engineering can be reduced to IDEs, in particular in relation to mathematical modeling of biological phenomena [1-3], aeroelasticity phenomena [4], population dynamics [5], neural networks [6], electrocardiology [7], electromagnetic [8], electrodynamics [9], and so on.
If the structure density is higher than the fluid density, such as in aeroelasticity, the added mass effect is negligible.
Edited versions of 23 selected papers cover hydrodynamics, aeroelasticity, computational methods, analytical studies, vortex induced vibrations, experimental studies and validation, and industrial applications.
Cesnik, "Static Nonlinear Aeroelasticity of Flexible Slender Wings in Compressible Flow" (presentation AIAA-2005-1945, 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Austin, TX, 18-21 April 2005), http://deepblue.lib.umich.edu /bitstream/2027.42/76231/1/AIAA-2005-1945-496.pdf; Leonard Meirovitch and Ilhan Tuzcu, "Unified Theory for the Dynamics and Control of Maneuvering Flexible Aircraft," AIAA Journal 42, no.