Read e-book online A Modern Course in Aeroelasticity (Solid Mechanics and Its PDF

By Robert Clark, David Cox, Howard C. Jr. Curtiss, John W. Edwards, Kenneth C. Hall, David A. Peters, Robert Scanlan, Emil Simiu, Fernando Sisto, Thomas W. Strganac, E.H. Dowell

ISBN-10: 1402020392

ISBN-13: 9781402020391

During this new version, the elemental fabric on classical linear aeroelasticity has been revised. additionally new fabric has been additional describing fresh effects at the examine frontiers facing nonlinear aeroelasticity in addition to significant advances within the modelling of unsteady aerodynamic flows utilizing the equipment of computational fluid dynamics and diminished order modeling suggestions. New chapters on aeroelasticity in turbomachinery and aeroelasticity and the latter chapters for a extra complicated direction, a graduate seminar or as a reference resource for an entr?e to the study literature.

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Extra resources for A Modern Course in Aeroelasticity (Solid Mechanics and Its Applications)

Example text

D3 (Nonlinear) equilibria for elastic twist: e > 0. (top) e < 0. 6. For q < qD, αe ≡ 0 as a consequence of setting α0 ≡ CMAC ≡ 0. Clearly for e > 0, αe = 0 when q < qD where qD ≡ Kα eS∂CL/∂α Note that two (symmetrical) equilibrium solutions are possible for q > qD. The actual choice of equilibrium position would depend upon how the airfoil is disturbed (by gusts for example) or possibly upon imperfections in the spring or airfoil geometry. α0 may be thought of as an initial imperfection and its sign would determine which of the two equilibria positions occurs.

As before, ∂C ∂α , ∂δ , ∂δ , ∂α , ∂δ are aerodynamic conH stants which vary with Mach and airfoil geometry. Note ∂C ∂δ is typically negative. The basic purpose of a control surface is to change the lift (or moment) on the main lifting surface. It is interesting to examine aeroelastic effects on this lift. To write the equations of equilibrium, we need the elastic moments about the elastic axis of the main lifting surface and about the hinge line of the control surface. These are −Kαα (positive nose up), −Kδ (δ − δ0 ) (positive tail down), and δe ≡ δ − δ0 , where δe is the elastic twist of control surface in which δ0 is the difference between the angle of zero aerodynamic control deflection and zero twist of the control surface spring.

3b) ∂α = CMAC0 , a constant, aerodynamic center moment coefficient in CL = CL0 + CMAC which q= ρU 2 , dynamic pressure and 2 ρ air density U air velocity c airfoil chord l airfoil span S airfoil area, c × 1 ∗ For two dimensional, incompressible flow this is at the airfoil quarter-chord; for supersonic flow it moves back to the half-chord. See Ashley and Landahl [1]. References are given at the end of each chapter. 3b) is a Taylor Series expansion of CL for small α. CL0 is the lift coefficient at α ≡ 0.

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A Modern Course in Aeroelasticity (Solid Mechanics and Its Applications) by Robert Clark, David Cox, Howard C. Jr. Curtiss, John W. Edwards, Kenneth C. Hall, David A. Peters, Robert Scanlan, Emil Simiu, Fernando Sisto, Thomas W. Strganac, E.H. Dowell


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