Results 101 to 110 of about 2,570 (205)

Investigation of Axial–Torsional Vibration Characteristics and Vibration Mitigation Mechanism in Compound Percussive Drilling

Applied Sciences
Severe drill string vibrations, particularly stick–slip, significantly compromise drilling efficiency and tool longevity in deep hard formations. Compound percussive drilling (CPD) has emerged as a promising technique to mitigate these vibrations and ...
Wei Wang, Boyu Guo, Gonghui Liu, Chunqing Zha, Tian Chen, Jun Li   +5 more
doaj   +1 more source

Study of sampling systems for comets and Mars [PDF]

Several aspects of the techniques that can be applied to acquisition and preservation of samples from Mars and a cometary nucleus were examined. Scientific approaches to sampling, grounded in proven engineering methods are the key to achieving the ...
Amundsen, R. J., Clark, B. C.
core   +1 more source

Tools and Algorithms for Sampling in Extreme Terrains [PDF]

, 2013
Extreme-terrain robots such as JPL’s Axel rover are enabling access to new and exciting science opportunities. The goal of this mini-program was to develop a compact sampling instrument for Axel.
Burdick, Joel, Nesnas, Issa, Tanner, Melissa   +2 more
core  

The Atacama Rover Astrobiology Drilling Studies (ARADS) Project. [PDF]

Astrobiology, 2023
Glass B, Bergman D, Parro V, Kobayashi L, Stoker C, Quinn R, Davila A, Willis P, Brinckerhoff W, Warren-Rhodes K, Wilhelm MB, Caceres L, DiRuggiero J, Zacny K, Moreno-Paz M, Dave A, Seitz S, Grubisic A, Castillo M, Bonaccorsi R.   +19 more
europepmc   +1 more source

VIPER’s Mass Spectrometer Observing Lunar Operations (MSolo)

The Planetary Science Journal
The Volatiles Investigating Polar Exploration Rover (VIPER) is a lunar volatiles detection and measurement mission that will land on Mons Mouton near Nobile crater, close to the Moon’s south pole.
Roberto Aguilar Ayala, Janine E. Captain, James T. Smith, Matthew L. Hancock, Alexander W. Jarnot, Kevin E. Smith, Prital J. Johnson, Christopher S. Johnson, Rodolphe Carro, Rolando J. Nieves, Christopher N. Bond, John Trautwein, Kenneth C. Wright, Jaime L. Winfield, Peter Santariello, Amy McAdam, P. Douglas Archer, Gregory Kreinheder, Jorge A. Diaz, Parvathy Prem, Kathleen E. Mandt, Aleksandra Gawronska, Barbara A. Cohen, Jaqueline W. Quinn   +23 more
doaj   +1 more source

Optimization of blasting parameters in opencast mines [PDF]

, 2007
Drilling and blasting are the major unit operations in opencast mining. Inspite of the best efforts to introduce mechanization in the opencast mines, blasting continue to dominate the production.
Parida, Chinmay Kumar, Rout, Manmit
core  

A Mission Simulating the Search for Life on Mars with Automated Drilling, Sample Handling, and Life Detection Instruments Performed in the Hyperarid Core of the Atacama Desert, Chile. [PDF]

Astrobiology, 2023
Stoker CR, Glass BJ, Stucky TR, Dave AI, Kobayashi LT, Quinn RC, Moreno-Paz M, Sánchez-García L, Mora MF, Kehl F, Parro V, Willis PA, Davila A, Noe Dobrea E, Rask JC, Ricardo D.   +15 more
europepmc   +1 more source

ROPEC - ROtary PErcussive Coring Drill for Mars Sample Return [PDF]

The ROtary Percussive Coring Drill is a light weight, flight-like, five-actuator drilling system prototype designed to acquire core material from rock targets for the purposes of Mars Sample Return. In addition to producing rock cores for sample caching,
Chu, Philip, Spring, Justin, Zacny, Kris
core   +1 more source

Simulation and Analysis of a Split Drill Bit for Pneumatic DTH Hammer Percussive Rotary Drilling

Geofluids
Reverse circulation impact drilling has the advantages of high drilling efficiency and less dust, which can effectively form holes in hard rock and gravel layer.
Yuanling Shi, Conghui Li
doaj   +1 more source

金剛石鉆進能量與花崗巖地層風化程度的關系 [PDF]

, 2008
Based on experimental data from a drilling process monitoring system instrumented with a hydraulic rotary drill rig in fill-weathered granite formation, the diamond penetrating energy was analyzed.
Lee, CF, Tan, Z, Tham, LG, Yue, ZQ
core