A novel torque analysis method for drilling deep lunar soil by DEM |
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| Institution: | 1. Department of Aerospace Engineering, Harbin Institute of Technology, 92 West Dazhi Street, 150001 Harbin, China;2. Dynamics and Vibration Control Laboratory, Harbin Institute of Technology, 92 West Dazhi Street, 150001 Harbin, China;1. Department of Aerospace Engineering, Harbin Institute of Technology, 92 West Dazhi Street, 150001 Harbin, China;2. Department of Mechanical Engineering, Harbin Institute of Technology, Weihai, No.2, Wen-hua West Road, 264209 Weihai, China;1. School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006, China;2. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;1. Harbin Institute of Technology, 359 mailbox 92 West Dazhi Street, Nan Gang District, Harbin, China;2. Harbin Institute of Technology, 137 mailbox 92 West Dazhi Street, Nan Gang District, Harbin, China |
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| Abstract: | In order to solve the torque design problem of deep lunar soil sampling using drilling, a novel torque analysis method was presented based on discrete element model (DEM). This method includes three stages: drilling simulation of the bit and stem segment, resultant torque calculation, and predicted curve fitting. First, special drilling models were designed for a bit and stem separately. A high-density equivalent particle group, boundary vibration control, pre-drilling simulation and constant pressure surface control were designed for the bit and stem drilling modelling at different depths to ensure the rationality of the model. An example of the torque synthesis process was given, and the simulation time was analyzed. Finally, the simulation predicted torque curve was plotted and compared with the experimental curve. The experimental and simulation curves show that as the drilling depth increases, the torque increases approximately linearly first and then flattens out gradually after a depth of 1 m. The consistency between the two results indicated that the proposed method was validated. Using this method, engineers can take short time to analyze the torque and design basic parameters of the drill mechanism. The problem of high experimental cost and long simulation time in torque design is solved. |
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| Keywords: | Discrete element method Lunar soil Equivalent model Deep drilling Tests with a lunar simulant |
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