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Based on the composition of RPUD system, ANSYS (ANSYS12.0, ANSYS Inc., Canonsburg, PA, USA)  is employed to establish the finite element model of the VLT coupler and percussive horn (rotary-percussive composition), as shown in Figure 2.
To validate the effect of the weight of free mass on the percussive energy of the drill tool in the collision model, different weights of free masses are assembled into the RPUD, and the vibration velocity of the drill tool is measured with the help of the high-speed camera system.
To further observe the effect of the free mass on the percussive kinetic energy of the drill tool, drilling experiments of RPUD with load condition is carried out under different weights of free mass.
The experiments also indicate that rotary-percussive drilling has higher drilling efficiency than percussive drilling, which validates the aforementioned advantages of the RPUD.
This paper proposed an impact dynamics analysis of the percussive system based on the rotary-percussive ultrasonic drill (RPUD).
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