Impact Dynamics of a Percussive System Based on Rotary-Percussive Ultrasonic Drill

Table 1

The initial parameters of the percussive system.

Parameters	Symbols	Unit	Value
Acceleration of gravity		m/s^2	9.8
Coefficient of restitution between the free mass and the drill tool		—	0.8
Coefficient of restitution between the free mass and the percussive horn		—	0.9
Vibration amplitude of the percussive horn			15
Vibration frequency of the percussive horn		kHz	20
Mass of percussive horn		kg	0.08
Mass of drill tool		kg	0.05
Mass of free mass		kg	0.008