The value of SEDD is nearly equal to that of specific energy of percussivedrilling(SEPD) in moderately weathered granite.
在软的全风化及强风化花岗岩中，金刚石钻进比功值低于冲击凿碎比功值；
2
In this paper, based on the theory of percussivedrilling, the following optimum design of hydraulic rock drills are studied with the application of wave mechanics.
本论文在冲击凿岩的理论基础上，应用波动力学理论，研究了冲击凿岩系统优化设计中的一些问题。
3
GCF-20A reverse circulation percussive rotary drill rig is a multi function drill rig with percussivedrilling as the main means and rotary drilling as supplemented.