Research Article
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/s2 | 9.8 | Coefficient of restitution between the free mass and the drill tool | | ā | 0.8 | Coefficient of restitution between the free mass and the percussive horn | | ā | 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 |
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