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By-pass transition to airfoil flutter by transient growth due to gust impulse
We present an experimental study which shows that the mechanism known as transient growth of energy, can cause flutter instability of a nonlinearly flexible airfoil at a wind velocity below the linear critical flutter velocity. A flap mounted upstream a flexible airfoil in a wind tunnel generates a...
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Published in: | Journal of fluids and structures 2009-11, Vol.25 (8), p.1272-1281 |
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container_end_page | 1281 |
container_issue | 8 |
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container_title | Journal of fluids and structures |
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creator | Schwartz, M. Manzoor, S. Hémon, P. de Langre, E. |
description | We present an experimental study which shows that the mechanism known as transient growth of energy, can cause flutter instability of a nonlinearly flexible airfoil at a wind velocity below the linear critical flutter velocity. A flap mounted upstream a flexible airfoil in a wind tunnel generates a single gust which triggers the plunge and pitch oscillations. This gust is characterized using two-component hot-wire anemometry. For the first time experimental evidence is provided to confirm the theoretical scenario of a by-pass transition to flutter by transient growth. From an engineering point of view, transient growth might explain also the premature structural fatigue encountered in structures subject to wind. |
doi_str_mv | 10.1016/j.jfluidstructs.2009.08.001 |
format | article |
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A flap mounted upstream a flexible airfoil in a wind tunnel generates a single gust which triggers the plunge and pitch oscillations. This gust is characterized using two-component hot-wire anemometry. For the first time experimental evidence is provided to confirm the theoretical scenario of a by-pass transition to flutter by transient growth. 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subjects | Aeroelasticity By-pass transition Engineering Sciences Exact sciences and technology Fluid mechanics Fluids mechanics Flutter Fracture mechanics (crack, fatigue, damage...) Fundamental areas of phenomenology (including applications) Mechanics Physics Solid mechanics Structural and continuum mechanics Transient growth Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...) |
title | By-pass transition to airfoil flutter by transient growth due to gust impulse |
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