Results 81 to 90 of about 2,570 (205)
Robotic Planetary Drill Tests [PDF]
, 2010 Several proposed or planned planetary science missions to Mars and other Solar System bodies over the next decade require subsurface access by drilling. This paper discusses the problems of remote robotic drilling, an automation and control architecture ...
Glass, Brian J. +2 more
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Energy Transmission in Percussive Drilling [PDF]
Fall Meeting of the Society of Petroleum Engineers of AIME, 1959 Abstract A simple analysis of the mechanics of stress and energy transmission in percussive drilling is presented. Four basic components of the system are recognized:the hammer,the drill rod,the bit, andthe rock and the effect of each in determining the ultimate energy transmitted into the rock is considered.
openaire +1 more source
Applied SciencesThe reverse circulation pneumatic down-the-hole (DTH) drilling system employs percussive drilling to achieve high efficiency and strong adaptability across diverse rock formations. However, its cutting removal efficiency remains suboptimal.
Kunkun Li +4 more
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Development and application of MWD system for DTH drilling rig
Yantu gongcheng xuebaoThe researches on the measurement while drilling (MWD) technology in the field of open-pit mining are still in the early stage, and the development of MWD systems is the primary task to realize the application of MWD technology in the mining engineering ...
HOU Shijun 1, DING Weijie 1, TIAN Shuaikang 1, LIANG Shufeng 1, LIU Dianshu 1, GUO Dachao 2
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International Journal of Mining Science and Technology, 2017 Drill machines used in surface mines, particularly in coal, is characterized by a very poor utilization (around 40%) and low availability (around 60%).
Suraj Kumar +2 more
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Percussive-rotary Drilling Tool with Spring Accumulating Collision
Shiyou jixie, 2015 Percussive-rotary drilling technology is one of the effective ways to improve the drilling speed of deep and super-deep wells.Percussive-rotary drilling tool with spring accumulating collision is developed by combining a short positive displacement motor
Xuan Lingchao +3 more
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Optimisation of an ultrasonic drill horn for planetary subsurface sample retrieval [PDF]
, 2011 Ultrasonic tools can cut through foodstuffs, biological material and other soft matter with relative ease. However, when attempts are made to cut through harder material, the rate of progress markedly declines.
Harkness, Patrick, Lucas, Margaret
core
Granite rock fragmentation at percussive drilling - experimental and numerical investigation
, 2013 International audienceThe aim of this study is to numerically model the fracture system at percussive drilling. Due to the complex behavior of rock materials, a continuum approach is employed relying upon a plasticity model with yield surface locus as a ...
Forquin, Pascal +4 more
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Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation
Applied SciencesWith the increasing depth of mining operations and the emergence of complex geological conditions, pneumatic down-the-hole (DTH) hammers have become an efficient drilling technology.
Jing Zhou +4 more
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Shiyou jixieIn order to solve the problems of poor rock drillability,low rock-breaking efficiency and short service life caused by high hardness,high strength and stress concentration of bottomhole rock in deep formations,a new concept of ROP improvement by ...
Liu Yongwang +5 more
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