http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Prediction Model of Performance for Rock Drilling System
김대지(D. J. Kim),정진태(J. Chung),송창헌(C. Song) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.6
A drilling prediction model is developed to predict the performance of a down-the-hole (DTH) hammer during percussive drilling of the rock surface. It links together a drilling dynamics model [1] of the drill bit and a hammer dynamics model [2]. The drilling dynamics model uses to derive the drilling efficiency for soft, mediumhard, and hard rock. The drilling efficiency for 3 types of rocks from the relationship among the rock, drill bit, and piston during the impact process are defined as the input value of the hammer dynamics model. Next, the impact performance of a DTH hammer is investigated considering the drilling efficiency and different rock strengths. As a result, a drilling prediction model is proposed to predict the drilling performance of a DTH hammer that considers the effect of the drill bit. Finally, the validity of the drilling performance prediction model is verified through comparison with in situ drilling test results.