Results 111 to 120 of about 213 (157)
Some of the next articles are maybe not open access.
Embedded Drilling System Using Rotary-Percussion Drilling
2018The drilling technology is widely used in various fields. This technology has been developed explosively by large companies. However, most of the conventional drilling systems require large equipment such as rig and mud systems. This makes it difficult for drilling in polar or space environments where large equipment is hard to enter or carry. To solve
Jongheon Kim, Jinkwang Kim, Hyun Myung
openaire +1 more source
Determination of Efficient Rotary Percussive Drilling Techniques for Strong Rocks
Journal of Mining Science, 2021The authors address the problem connected with the determination of efficient rotary percussive drilling techniques with DTH hammers and present estimation criteria for their value ranges such that to ensure drilling at minimum energy content and wear of bits.
V. N. Karpov, A. M. Petreev
openaire +1 more source
Optimization of percussive mechanism in rotary-percussion drill for lunar exploration
2013 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2013Rotary-percussive Drill (RPD) has been widely employed in extraterrestrial exploration as a main drilling and sampling device. Percussive mechanism, as an inevitable part of RPD, is commonly utilized to exert percussion onto drill stem to improve drilling performance once hard rock is encountered.
Degang Jie +6 more
openaire +1 more source
Research on a Rotary-Percussive Coring Drill for Lunar Exploration
Applied Mechanics and Materials, 2012China is launching the Chang'e project to send automated machine for acquiring the lunar soil and returning to the earth. Thus, we are trying to develop a kind of effective mechanism for the exploration mission of lunar soil coring. This paper presents a rotary-percussive coring drill which is a novel scheme for the deep surface soil acquirement.
S. Li +5 more
openaire +1 more source
Rotary Percussion and Auger Drilling
2010In rotary percussion drilling, a variety of blade or roller bits (Fig. 5.2) mounted on the end of a rotating string of rods cut and break the rock. A percussion or hammer action in conjunction with a chisel bit can be used to penetrate hard material.
openaire +1 more source
Quantitative estimate of rotary–percussion drilling efficiency in rocks
Journal of Mining Science, 2016The factors that have significant influence on efficiency of rotary–percussion rock drilling with downhole machines are discussed. The results obtained in physical simulation of dynamic driving of rock-breaking indenters in rocks are reported. The results are analyzed from the standpoint of the phenomenon of alternating response of rocks to dynamic ...
V. N. Oparin +2 more
openaire +1 more source
Drilling rate of rotary percussion drill bits and rock characteristics
Journal of Terramechanics, 1988Abstract Fourteen kinds of rock specimen and rock mass were tested to find the main rock mass characteristics affecting the drilling rate of a bit in rotary percussion by 2 hand-type electric and air hammer drills. It was found that the drilling rate of the bit, V (cm/min), consuming constant rotary percussion power of 1050 W could be expressed as ...
openaire +1 more source
A bit–rock interaction model for rotary–percussive drilling
International Journal of Rock Mechanics and Mining Sciences, 2011Abstract Rotary–percussive drilling is considered a promising approach to improve drilling performance in hard rock formations. Different from percussive drilling, it is a hybrid form of drilling, since the weight-on-bit and the angular velocity are still acting as in conventional rotary drilling.
openaire +1 more source
A 3D FEM Methodology for Rock Breakage in Rotary-Percussive Drilling
2010 International Conference on Computational and Information Sciences, 2010In order to reveal the rock breaking mechanism of the rotary-percussive drilling, considering the coupling effect of the static pressure, impact force and rotary cutting and using the finite element methods (FEM), a three-dimensional (3D) insert-rock mutual action model is established.
Xiao Xiaohua +5 more
openaire +1 more source
Development of a rotary-percussive ultrasonic drill for extraterrestrial rock sampling
2017 IEEE International Ultrasonics Symposium (IUS), 2017Compared with traditional rotary-percussive drills driven by electromagnetic motors, ultrasonic drills show advantages of small size, low power, low weight on bit, and lubrication free, making them available for the extraterrestrial rock sampling, especially for the minor planet with a weak gravitational field.
Qiquan Quan +5 more
openaire +1 more source