Document Type : Research - Paper
Authors
1
M.Sc, Dept. of Mining Engineering, Tarbiat Modares University, Tehran, Iran
2
Ph.D Student, Dept. of Mining Engineering, Tarbiat Modares University, Tehran, Iran
3
Associate Professor, Dept. of Mining Engineering, University of Hamedan, Hamedan, Iran
Abstract
Drilling with the help of a rotary drilling machine is an important tool for exploration and extraction in mines. On the other hand, estimating the costs and efficiency of the rotary drilling machine is a fundamental step in the design of mining and construction projects. Drilling Penetration Rate (PR) is a suitable indicator for estimating the costs and efficiency of rotary drilling rigs. Therefore, achieving the optimal amount of PR in the rotary drilling machine will reduce costs and increase the efficiency of the rotary drilling machine. For this purpose, in this article, one of the enhanced Machine Learning (ML) methods that combines Light Gradient Boosting (LGB) and Random Forest (RF) with Meta-Heuristic algorithms (MH), including Grey Wolf Optimizer (GWO) and Harris hawk (HHO), has been done to estimate PR. In order to validate the developed models, the models were implemented on the collected data sets. The dataset, including 7 independent input variables, was used. The independent input variables are drilling Diameter in inches (D), rotational speed in Revolutions Per Minute (RPM), Weight On Bit (WOB), Uniaxial Compressive Strength (UCS) of rock in megapascals, Tensile (T) strength of rock in terms of megapascals, the Joints Spacing (JS) in the ground in centimeters, and the relative accuracy of the Joints in Degrees (JD). The obtained results show that the RF-GWO method (R2 = 0.987 and RMSE = 3.059) is more accurate than LGB-GWO (0.912 and 8.045), LGB-HHO (0.917 and 7.831), and RF-HHO (0.912 and 8.044) in training data. Also, sensitivity analysis studies indicate that RPM and JD parameters have the most and least effect on the PR of the rotary drilling machine, respectively.
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