Variable mass dynamic vibration absorber and its performance of vibration reduction

Aimed at the defect of narrow band of traditional dynamic vibration absorber(DVA),a novel adaptive dynamic vibration absorber based on variable mass was proposed in order to obtain the wide band DVA.Different from other adaptive dynamic vibration absorbers based on stiffness or damping modification suggested by other researchers,a variable mass element,i.e.a liquid box was introduced in the new DVA.By means of injecting liquid into or drawing liquid out the box,the DVA mass could be changed,while its natural frequency could be adjusted too.The performance of the new DVA in vibration reduction on a primary system was studied via simulation and some experiments.The results show that the proposed DVA can reduce the vibration of the primary system over a much wider band comparing with a traditional one,and the maximal vibration attenuation in an experiment is about 29dB.The vibration reduction is obvious.The variable mass DVA is of great significance for effective wide band vibration reduction.1tab,5figs,12refs.