Results 1 to 10 of about 233 (160)
Measurement of Stress Waves Propagation in Percussive Drilling [PDF]
Sensors, 2021 This work describes the results of a test campaign aimed to measure the propagation of longitudinal, torsional, and flexural stress waves on a drill bit during percussive rock drilling.
Bortolino Saggin, Diego Scaccabarozzi
exaly +8 more sources
Evaluation of the energy efficiency of rotary percussive drilling using dimensionless energy index
Journal of Rock Mechanics and Geotechnical Engineering, 2022 This paper sets forth a geomechanics framework for assessing the energy efficiency of rotary percussive drilling using the energy criterion, which has been proposed by Victor Oparin for volumetric destruction of high-stress rocks having nonuniform ...
Vladimir Karpov, Anton Konurin
exaly +3 more sources
Bioinspired Drilling for Extraterrestrial Applications [PDF]
BiomimeticsThis review presents the novel synthesis of nature-inspired drilling strategies specifically tailored for extraterrestrial environments, where conventional technologies fail under the environmental conditions and power and mass constraints.
Gal-Erdene Battsengel +3 more
doaj +2 more sources
Theoretical analysis and design of hydro-hammer with a jet actuator: An engineering application to improve the penetration rate of directional well drilling in hard rock formations. [PDF]
PLoS ONE, 2018 Rapid horizontal directional well drilling in hard or fractured formations requires efficient drilling technology. The penetration rate of conventional hard rock drilling technology in horizontal directional well excavations is relatively low, resulting ...
Jiang-Fu He +3 more
doaj +2 more sources
Drilling Processes with Hydraulic Percussion Rock Drills
Journal of MMIJ, 2017 Rock drills were developed about two hundred years ago, and hydraulic percussion rock drills are about half-century old. Performance and efficiency of rock drills have been increased by a number of researchers and engineers.
Kimihiro HASHIBA +2 more
doaj +3 more sources
Numerical simulation of percussive drilling [PDF]
International Journal for Numerical and Analytical Methods in Geomechanics, 2015 SummaryThis paper presents a novel dynamical model to analyze the long‐term response of a percussive drilling system. This departs from existing approaches that usually consider a single activation and bit/rock interaction cycle for the analysis of the process performance.
Vincent Denoel +2 more
exaly +2 more sources
Experimental-numerical method for evaluation of energy consumption in percussive drilling of granite [PDF]
EPJ Web of Conferences, 2021 Most geothermal energy is found in hot and dry rock (HDR), and the total resources distributed at depths of 3-10 km are 20.9×106 EJ. Most HDR projects are developed in granite formations and understanding and control of the energy consumption in ...
Yao Wei, Hokka Mikko
doaj +1 more source
Research on Impact Stress Transfer Characteristics of Lunar Rock Coring Drill
Shock and Vibration, 2021 In the whole lunar surface drilling and sampling task, it is critical to make the operation of the drilling and sampling impact system efficient and reliable.
Peng Li +4 more
doaj +1 more source
Energy Science & Engineering, 2021 Compound percussive drilling technology is a new method to improve the rock‐breaking efficiency in deep hard formation. In order to study the rock‐breaking mechanism of compound impact drilling, the thermal‐structure coupling simulation of the dynamic ...
Wei Wang +5 more
doaj +1 more source
IEEE Access, 2018 Compared with conventional drill, an ultrasonic drill can break into rocks under lower weight on bit and lower power, which is more suitable to sample in low gravity environment for deep-space exploration. However, the ultrasonic drill cannot remove rock
Yinchao Wang +5 more
doaj +1 more source