Abstract
Energy dissipation due to sloshing liquid in torus shaped dampers is studied analytically accounting for nonlinearities and viscous effects so as to be applicable at resonance, and its validity assessed through an extensive experimental program. This is followed by a parametric analysis of the dampers which shows that low liquid heights and large diameter ratios with the system operating at the liquid sloshing resonance result in increased damping. Tests with two and three dimensional models in laminar and turbulent flows suggest that the dampers can succesfully control both vortex resonance and galloping types of instabilities. The information should prove useful, particularly, in damping low frequency oscillations encountered in industrial aerodynamics, earthquake and ocean engineering problems.
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