Results 11 to 20 of about 164 (152)
Impact Dynamics Prediction of a Rotary-Percussive Ultrasonic Drill With a Free Mass
IEEE Access, 2018 The rotary-percussive ultrasonic drill (RPUD) employs vibrations on two sides of a piezoelectric stack to drive a drill tool to achieve simultaneous rotary-percussive motion.
Deen Bai +5 more
doaj +2 more sources
Shock and Vibration, 2017 Based on an optimized lunar regolith coring bit (LRCB) configuration, the load characteristics of rotary-percussive drilling of lunar rock simulant in a laboratory environment are analyzed to determine the effects of the drilling parameters (the ...
Peng Li +3 more
doaj +1 more source
Impact Dynamics of a Percussive System Based on Rotary-Percussive Ultrasonic Drill
Shock and Vibration, 2017 This paper presents an impact dynamic analysis of a percussive system based on rotary-percussive ultrasonic drill (RPUD). The RPUD employs vibrations on two sides of one single piezoelectric stack to achieve rotary-percussive motion, which improves ...
Yinchao Wang +5 more
doaj +1 more source
Energies, 2023 Down-the-hole (DTH) hammer drilling with reverse circulation is a novel, mobile, high-speed drilling system suitable for the specific requirements of mine rescue. This technology can be applied to shorten the rescue time during mine accidents.
Kun Bo +4 more
doaj +1 more source
Rotary ultrasonic machining of rocks: An experimental investigation
Advances in Mechanical Engineering, 2018 Rock drilling is widely used to explore and mine energy resources. It has also been used to extract samples to study the earth’s geological composition and topography and to explore different planets.
PKSC Fernando, Meng Zhang, Zhijian Pei
doaj +1 more source
Rock Breaking Analysis and Process Parameter Optimization of Pneumatic DTH Hammer Bit
Shiyou jixie, 2022 In order to improve the rock-breaking efficiency and penetration ability of pneumatic DTH hammer in hard strata, based on the theory of nonlinear contact dynamics, the ABAQUS software was used to build a piston-pneumatic DTH hammer bit-rock(granite ...
Wang Shenglin +5 more
doaj
Shiyou jixie, 2020 High-speed rotary percussive drilling technology is a new type of high-efficiency rock breaking technology based on PDM drilling and self-oscillating rotary percussive drilling.
Yu Yang, Liu Shiyin
doaj
International Journal of Mining Science and Technology, 2017 Drill machines used in surface mines, particularly in coal, is characterized by a very poor utilization (around 40%) and low availability (around 60%).
Suraj Kumar +2 more
doaj +1 more source
(Un)threading Rhythms: On Affect and Vibe in a Rave
Anthropology of Consciousness, EarlyView.ABSTRACT In Toronto, raves arise across large nightclubs, DIY venues and outdoors, despite changing regulations that have further arranged and narrowed their possibility in the past 4 years. Following a rave in Toronto, this work explores ways that potentialities and affects emerge in a single night, through my entry of taking part in dancing and ...
Tatiana Yunadi
wiley +1 more source
Boreas, EarlyView.Understanding the temperature variability of past interglacial cycles is essential to predict future climates. We present a new summer temperature reconstruction, based on the subfossil chironomid record from a small palaeolake adjacent to the Middle Palaeolithic site of Lichtenberg, northern Germany. The record spans from the Saalian late glacial over
Sonja Rigterink +10 more
wiley +1 more source