ESDU 91010:2012

$89.05

Response of Structures to Galloping Excitation Background and Approximate Estimation

Published By	Publication Date	Number of Pages
ESDU	2012-02	33

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Category: ESDU

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Description

ESDU 91010 describes the mechanism of galloping, that is an
aeroelastic response in which changes in wind load due to structure
response are in-phase with the structure velocity. The concepts of
soft and hard oscillators are introduced and explained, and the
possibilities of across-wind, along-wind and torsional galloping
are discussed. Stall galloping, wake galloping and flutter as
separate mechanisms are defined and briefly described. A method is
provided for estimating the wind speed for the onset of galloping
(or the structural damping required to prevent galloping at a given
wind speed) for a single-degree-of-freedom system. A technique of
approximately determining the galloping onset wind speed and the
maximum amplitude is suggested for force coefficient curves typical
of sharp-edged sections. Typical results for onset wind speed and
response are shown for typical force curves. The theoretical
approach used is fully explained and a worked example illustrates
its use. Methods of reducing or eliminating galloping are outlined
briefly.