Modelling of a rotary hammer with the implementation of a Dynamic Eliminator of Vibrations

Abstract

The mathematical modelling of a Dynamic Eliminator of Vibrations is presented. This model is based on two drums that rotate in opposite directions with an angular speed equal to the excitation frequency of the system. These drums contain the same amount of free elements such as rollers or spheres that translate in a viscous environment and compensate the excitation forces with the action of their centrifugal force. Also, a rotary hammer working principle is modelled with a novel method for the mathematical implementation of the DEV to this system, to determine the possibility of vibrations damping. Several systems of equations are developed and solved numerically using different input parameters. The results of these simulations where vibrations reduction is illustrated are presented throughout this work, starting from simpler models up to systems with several degrees of freedom.