Simulation of the transient operational behaviour of a novel electromechanical vibration exciter for rock drills Original Research Article

This paper concerns a novel vibration exciter for rock drills. In conventional hammer drills vibrations are generated mechanically. The disadvantage of those systems is that the frequency of the vibrations is either constant or correlated to the rotational speed of the drill. This contribution presents a novel vibration exciter working electromechanically. The frequency and the energy of the vibrations are adjustable. It will be shown in this paper how to develop a mathematical model of the system. Computations for different operating modes are demonstrating the reliability performance. Finally, test results of a prototype are presented.