Response of structures to galloping excitation. Background and approximate estimation.
Abstract: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.
|Data Item ESDU 91010|
- Aircraft Noise
- Fatigue - Endurance Data
- Fatigue - Fracture Mechanics
- Fluid Mechanics, Internal Flow
- Fluid Mechanics, Internal Flow (Aerospace)
- Heat Transfer
- Physical Data, Chemical Engineering
- Stress and Strength
- Transonic Aerodynamics
- Vibration and Acoustic Fatigue
- Wind Engineering
Aerospace Materials Data
Additional Engineering References