Results 1 to 10 of about 9,186,751 (221)
Design of a New Type of Torsional Impactor and Analysis of Its Impact Performance
Applied Sciences, 2021 In view of the stick-slip phenomenon in deep and hard rock drilling, a new type of torsional impactor that can provide torsional impact vibration was designed.
Xianfeng Tan +5 more
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Shock and Vibration, 2021 This paper focuses on the fault characteristics of the bending and torsional motions of a rub-impact dual-rotor system caused by aircraft flight maneuvers.
Tian Gao, Shuqian Cao, Tiancheng Zhang
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Suppression of torsional oscillations based on IMPACT controlling structure [PDF]
Theoretical and Applied Mechanics, 2006 In this paper, an algorithm for suppression of the torsional oscillations, in the computer controlled servo systems, is purposed. A few modification of the IMPACT structure (Internal Model Principle and Control Together) in the digitally controlled ...
Matijević Milan +3 more
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Advances in Mechanical Engineering, 2018 Stick-slip vibration is a big problem that the drilling of deep wells has to face, especially for drilling of tough formations. This type of vibration leads to failure problems, reduces the rate of penetration, and lowers the borehole quality ...
Liping Tang, Xiaohua Zhu
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Coupled Lateral and Torsional Vibration of Rub-Impact Rotor during Hovering Flight [PDF]
Shock and Vibration, 2021 When aircraft make a maneuvering during flight, additional loads acting on the engine rotor system are generated, which may induce rub-impact faults between the rotor and stator. To study the rub-impact response characteristics of the rotor system during
Nan Zheng +3 more
semanticscholar +2 more sources
The rock breaking and ROP increase mechanisms for single-tooth torsional impact cutting using DEM
Petroleum Science, 2019 Torsional impact drilling is a new technology which has the advantages of high rock-breaking efficiency and a high rate of penetration (ROP). So far, there is no in-depth understanding of the rock-breaking mechanism for the ROP increase from torsional ...
Xiao-Hua Zhu, Yun-Xu Luo, Wei-ji Liu
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Analysis of the effects of torsional impact tools on drill string stick–slip vibration
Energy Exploration & ExploitationTorsional impactor is widely used in deep and ultra-deep wells because it can suppress stick–slip vibration and increase ROP. As the direct factor affecting torsional impactor effect, it's working parameters study is still not sufficient.
Chaoyi She +5 more
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Impact Torsion Tests of Heat-Treated Tool Steels
The Journal of the Japan Institute of Metals, 1941 This is the second report for the “Impact Torsion Test of Quenched and Tempered Tool Steels”.(1) The Impact torsion values of heat-treated 10 kind tool steels were measured by changing tempering temperatures; the results are shown in Table 1 and Figs. 1 to 11. The impact values show some max.
Mititosi Itihara
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Impact of intelligent phacoemulsification software on torsional phacoemulsification surgery
Clinical Ophthalmology, 2012 Silay Canturk Ugurbas, Sinan Caliskan, Atilla Alpay, Suat Hayri UgurbasDepartment of Ophthalmology, Bulent Ecevit University School of Medicine, Zonguldak, TurkeyBackground: The purpose of this study was to compare phacoemulsification energy parameters ...
Canturk Ugurbas S +3 more
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Oligothiophene wires: impact of torsional conformation on the electronic structure.
Physical Chemistry Chemical Physics, 2016 Charge transport in polymer- and oligomer-based semiconductor materials depends strongly on the structural ordering of the constituent molecules. Variations in molecular conformations influence the electronic structures of polymers and oligomers, and ...
D. A. Kislitsyn +7 more
semanticscholar +4 more sources