Results 21 to 30 of about 1,056,070 (342)

A parametric study for the design of an optimized ultrasonic-percussive planetary drill tool [PDF]

, 2016
Traditional rotary drilling for planetary rock sampling, in situ analysis, and sample return are challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity ...
Harkness, Patrick, Li, Xuan, Lucas, Margaret, Timoney, Ryan, Worrall, Kevin   +4 more
core   +1 more source

Petrography and petrology of the Hawaii Scientific Drilling Project lavas: Inferences from olivine phenocryst abundances and compositions [PDF]

, 1996
The Mauna Loa (ML) and Mauna Kea (MK) lavas recovered by the Hawaii Scientific Drilling Project (HSDP) include aphyric to highly olivine-phyric basalts.
Alves, Sophie, Baker, Michael B., Stolper, Edward M.   +2 more
core   +1 more source

Percussion characteristic analysis for hydraulic rock drill with no constant-pressurized chamber through numerical simulation and experiment

Advances in Mechanical Engineering, 2019
Considering the insufficiency of numerical study on the percussion characteristic of hydraulic rock drill, which restricts the improvement of efficiency and reliability, a coupling model including the impact piston, spool valve, impact accumulator, and ...
Wei Ma, X. Geng, C. Jia, Lulu Gao, Yuchao Liu, Xiang Tian   +5 more
semanticscholar   +1 more source

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Advances in Civil Engineering, 2020
This study suggests a method for quantitatively estimating the drilling performance of the down-the-hole (DTH) hammer during percussive drilling of rock surfaces. A pneumatic dynamic model of the DTH hammer was developed that considers the mass flow rate
Dae-Ji Kim, Jaewon Kim, Booyeong Lee, Min-Seok Shin, Joo-Young Oh, Jung-Woo Cho, Changheon Song   +6 more
doaj   +1 more source

Study on Monitoring Rock Burst through Drill Pipe Torque

Shock and Vibration, 2015
This paper presents a new method to identify the danger of rock burst from the response of drill pipe torque during drilling process to overcome many defects of the conventional volume of drilled coal rubble method.
Zhonghua Li, Liyuan Zhu, Wanlei Yin, Yanfang Song   +3 more
doaj   +1 more source

Testing the ureilite projectile hypothesis for the El'gygytgyn impact: determination of siderophile element abundances and Os isotope ratios in ICDP drill core samples and melt rocks [PDF]

, 2013
The geochemical nature of the impactites from International Continental Scientific Drilling Project-El'gygytgyn lake drill core 1C is compared with that of impact melt rock fragments collected near the western rim of the structure and literature data ...
Abe, Alvarez, Anderson, Bell, Belyi, Binzel, Bogard, Buchwald, Burbine, Claeys, Collins, Dabizha, Doerffel, Evans, Feldman, Foriel, Gaffey, Gebhardt, Gelinas, Glushkova, Goderis, Goderis, Goderis, Goderis, Govindaraju, Grieve, Gurov, Gurov, Gurov, Gurov, Gurov, Gurov, Hall, Hassler, Heiken, Hutchison, Jenniskens, Kenkmann, Koeberl, Koeberl, Koeberl, Koeberl, Korotev, Kyte, Kyte, Layer, Maier, Marti, McDonald, McDonald, McDonough, Meisel, Meisel, Melles, Melles, Melles, Morgan, Morgan, Nakamura, Nowaczyk, Palme, Palme, Palme, Palme, Palme, Pernicka, Peucker-Ehrenbrink, Pieters, Plessen, Rankenburg, Raschke, Rollinson, Schmidt, Schmidt, Shukolyukov, Sigurdsson, Simonson, Smit, Stone, Tagle, Tagle, Tagle, Tagle, Tagle, Taylor, Trinquier, Va'lter, Warren, Wasson, Wedepohl, Weisberg, Wittmann, Wolf, Yurimoto, Zolensky   +94 more
core   +1 more source

Glass in the submarine section of the HSDP2 drill core, Hilo, Hawaii [PDF]

, 2004
The Hawaii Scientific Drilling Project recovered ~3 km of basalt by coring into the flank of Mauna Kea volcano at Hilo, Hawaii. Rocks recovered from deeper than ~1 km were deposited below sea level and contain considerable fresh glass. We report electron
Baker, Michael, Garcia, Michael, Seaman, Caroline, Sherman, Sarah, Stolper, Edward   +4 more
core   +1 more source

Cavitation erosion of the damping piston in double damping system of hydraulic rock drill and its influencing factors

AIP Advances, 2018
The fast response property of double damping system is beneficial to improve damping characteristics. However, the intense pressure fluctuation in damping chambers often leads to the cavitation erosion of damping piston and seriously affects the normal ...
X. Geng, Wei Ma, Fei Ma, Z. Zhou, Yuchao Liu, Xiang Tian   +5 more
semanticscholar   +1 more source

Research on Interdependence between Specific Rock Cutting Energy and Specific Drilling Energy

Applied Sciences, 2023
A method based on extensive laboratory and field measurements was developed to determine the dependence of specific rock cutting energy (SEc) on specific drilling energy (SEd) for machines with different operating and design characteristics and similar ...
Davor Antoljak, Dalibor Kuhinek, Tomislav Korman, Trpimir Kujundžić   +3 more
doaj   +1 more source

Drill Monitoring for Rock Mass Grouting: Case Study at the Stockholm Bypass

Rock Mechanics and Rock Engineering, 2020
In tunneling, rock mass grouting is a method applied to reduce water ingress. Grouting is influenced by rock mass conditions, especially apertures, frequency, and continuation of fracturing.
Jeroen van Eldert, J. Funehag, H. Schunnesson, D. Saiang   +3 more
semanticscholar   +1 more source