Results 11 to 20 of about 194,053 (216)
Design of a Femtosecond Laser Percussion Drilling Process for Ni-Based Superalloys Based on Machine Learning and the Genetic Algorithm [PDF]
Micromachines, 2023 Femtosecond laser drilling is extensively used to create film-cooling holes in aero-engine turbine blade processing. Investigating and exploring the impact of laser processing parameters on achieving high-quality holes is crucial.
Chenchong Wang
exaly +4 more sources
Energies, 2021 The rotary-percussion drilling method is a prospective way to decrease drilling costs. It is obvious, based on literature analyses and finished geothermal drilling, that the Lublin Basin can be perceived as the one where rotary-percussion drilling can be
Tomasz Sliwa +2 more
exaly +3 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
International Journal of Mining Science and TechnologyPercussion drilling is a promising approach for hot dry rock (HDR) fragmentation. However, understanding of HDR fragmentation mechanism under multi-dimensional percussion remains limited and hinders the corresponding drilling performance.
Huai Zhong +2 more
exaly +3 more sources
Mining, 2021 Drill bit failure is a prominent concern in the drilling process of any mine, as it can lead to increased mining costs. Over the years, the detection of drill bit failure has been based on the operator’s skills and experience, which are subjective and ...
Hisatoshi Toriya, Lesego Senjoba
exaly +3 more sources
Models for Solidification and Splashing in Laser Percussion Drilling
SIAM Journal on Applied Mathematics, 2002 Summary: This paper studies systems of partial differential equations modelling laser percussion drilling. The particular phenomenon considered in detail is the ejection of the thin layer of molten material. This thin layer is modelled as an inviscid flow between the fluid surface and fluid/solid interface, both of which are unknown moving boundaries ...
Warren Smith
exaly +5 more sources
Civil Engineering Dimension, 2023 A dam foundation structure is usually strengthened by grouting, which begins with grout hole drilling. This paper aims to examine a comparison between conventional rotary and rotary-percussion drilling techniques in a drilling case study of the Tugu ...
Dika Prasetyo , Setya Winarno
doaj +1 more source
Advances on Percussion Drilling with Femtosecond Laser in GHz-burst Mode [PDF]
EPJ Web of Conferences, 2023 Micromachining of various materials with femtosecond lasers operating in the GHz-burst regime has recently attracted great attention. In this contribution, we show our latest results on top-down percussion drilling in different dielectrics in this new ...
Balage Pierre +7 more
doaj +1 more source
Impacted Bones: Can Extant Primates Help Identify Tool Use in Early Hominins? [PDF]
Evol AnthropolABSTRACT Despite recent advances pushing back the earliest record of tool use, how and when it first emerged in hominins, and the extent to which it featured amongst the numerous co‐existing species, remain critical questions in paleoanthropology. In addition to analyzing fossils and lithic toolkits, novel strides in understanding this might be made by
Hurwitz RM +3 more
europepmc +2 more sources
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. Although the stress wave propagation during percussive drilling has been extensively modeled and studied in the literature, its experimental characterization is poorly ...
Scaccabarozzi D., Saggin B.
openaire +4 more sources