Vibration Control of Beams by Ball Screw Type Dampers : Case in which Dampers Possess Viscous Damping

Abstract

The effects of vibration isolation of a ball screw type damper applied to a simple beam, a clamped-clamped beam or a cantilever beam are discussed theoretically. The damper is composed of a ball screw, a flywheel and a dashpot. Numerical examples are given for a simple beam with one or two ball screw type dampers. It is demonstrated that, when the locations of the dampers are chosen suitably, the first, second and third resonant frequencies can be lowered considerably and the amplitude response factors of the beam at the points of attachment of the dampers are about 1 except in a narrow range of resonant frequencies.