Aeroelasticity

Jones, A.H., Polhemus, J.F., and Herrmann, W., Survey of Hypervelocity Impact Information II, Aeroelastic and Structures Research Laboratory, Massachusetts Institute of Technology Report No. A.S.R.L. 99-2, Cambridge, MA, 194 pp., December 1963. 

Smart systems involve sensing changing conditions and activating some sort of response, usually with an actuator. A project known as Active Aeroelastic Wing (AAW), conducted by the National Aeronautics and Space Administration (NASA), the U.S. Air Force Research Laboratory, and Boeing Company, studied wing elasticity in a modi-... 

Modified F/A-18A used for the Active Aeroelastic Wing project [NASA, Jim Ross]... 

National Aeronautics and Space Administration successfully tests the Active Aeroelastic Wing. 

National Aeronautics and Space Administration. Active Aeroelastic Wing Flight Research. Available online. URL http //ims.iw.nasa. gov/centers/dryden/pdf/120314main FS-061-DFRC.pdf. Accessed May 28, 2009. This NASA report describes the results of the Active Aeroelastic Wing project. 

Yiian-chen Feng, "An Introduction to the Theory of Aeroelasticity, Wiley, NY(1955)... 

R.L.Bisplinghoff et al, "Aeroelasticity," Addison-WesleyPubCb, Cambridge, Mass (1955)... 

Wind tunnel test methods were developed to determine wind induced stresses in cooling towers using aeroelastic models as part of a detailed model of a power station site. The turbulence and shear in the atmospheric wind are simulated. Tests on a model of Ferrybridge C Power Station show that resonant stresses are significant at the design wind speed. These increase as the fourth power of wind speed and can be greatly enhanced by turbulent wakes of upstream structures. 6 refs, cited. 

The paper outlines a general procedure for estimating the wind dynamic stresses in hyperbolic cooling towers on the basis of a statistical dynamic approach. Using wind tunnel measurements of pressure fluctuations and assuming that resonance is negligible, predicted wind stresses agreed with measured stresses on an aeroelastic model. The procedure is applied to 451-ft tower. 9 refs, cited. 

Aeroelasticity. This subjectis treated in the following books ... 

Aeroelastically tailored airframes, remote-piloted to pull 15-18g turns, giving a 55 per cent evasion rate versus enemy surface-air installations. So Razum would eventually lose all his fighters in the skies over Omsk. 

Raupach and Thom [522] explained this fact by shading some EPR elements by another ones ( shelter effect ). However, the mechanism of this effect has not been clarified is it a result of the vorticity behind obstacles, or of the extreme turbulence level, or of the basic difference between the natural forest canopy and laboratory models A possible consequence of aeroelasticity of canopy elements was also listed, [522], All these mean that the purposeful experiments should still be carried out as well as the mathematical models should be developed that account for a particular behavior of EPR elements (like the freedom of droplets to be drifted by the flow). 

Subcritical Hopf bifurcations occur in the dynamics of nerve cells (Rinzel and Ermentrout 1989), in aeroelastic flutter and other vibrations of airplane wings (Dowell and Ilgamova 1988, Thompson and Stewart 1986), and in instabilities of fluid flows (Drazin and Reid 1981). 

Dowell, E. H., and Ilgamova, M. (1988) Studies in Nonlinear Aeroelasticity (Springer, New York). 

Modi, V. J. and Slater, J. E. Unsteady aerodynamics and vortex-induced aeroelastic instability of a structural angle section. Journal cfWirui Engineering and Industrial Aerodynamics 116(4) (1994), 449-456. 

Kolonay RM, Sobolewski M (2011) Service ORiented Computing EnviRonment (SORCER) for large scale, distributed, dynamic fidelity aeroelastic analysis optimization, international forum on aeroelasticity and structural dynamics. In IFASD 2011, Paris, 26-30 June 2011... 

Induced-strain Actuation for Aeroelastic and Vibration Control... 

Aeroelastic and vibration control technology allows flight vehicles to operate beyond the traditional flutter boundaries, improves ride qualities, and minimizes vibration fatigue damage. Conventional active flutter and vibration control technology relies on the use of aerodynamic control surfaces operated by servo-hydraulic actuators. In this conventional configuration, the... 

Bae, J.S. Siegler, T.M. Inman, D.J. Aerodynamic and Static Aeroelastic Characteristics of a Variable-Span Morphing Wing. AIAA J. Aircraft, Vol. 42, No. 2. 

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