A study on multi-axis dynamic absorber with frequency tuning function using pneumatic rubber tube springs

Abstract

A multi-axial dynamic vibration absorber (DVA) with adjustable natural frequency mechanism has been developed. Air-filled rubber tubes are used as the spring and damping elements of the DVA, which support each face of the iron cubic auxiliary mass. For the rubber tube, when the internal air pressure is increased, the support stiffness is increased by expansion and pressing between the acrylic plate (which constitutes the outer frame of the DVA) and the auxiliary mass. In this way, the natural frequencies of the DVA can be adjusted by manipulating the air pressure. As a first step to realize a multi-axis DVA with frequency tuning ability, this study reports the vibration characteristics of the developed DVA when the air pressure of the supporting rubber tubes is changed uniformly.