Results 171 to 180 of about 4,537 (232)
Robot-Assisted Gait Training Enhances Phase-Specific Torque Generation, Balance, and Motor Recovery in Hemiplegia. [PDF]
Sensors (Basel)Özkoçak G, Sorucu E, Calabrò RS.
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Advanced mathematical modeling and simulation of high altitude balloons for precision stratospheric data collection. [PDF]
Sci RepSlimene MB, Khlifi MA, Tlili I.
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Regional prevailing wind directions cannot explain the global east facing of mature sunflower inflorescences: testing a hypothesis using wind data. [PDF]
PlantaRajna E, Weidinger T, Horváth G.
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Aerodynamic Mechanisms and Flow Physics of Bioinspired Slotted Wingtips. [PDF]
Integr Comp BiolWiswell H, Wissa A.
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Particulate Science and Technology, 2012
The mutual influence of translational and rotational spherical particle movements in calm water was studied using experimental data and numerical simulation. Spherical balls with a density close to that of water were speeded up in special devices, which ensured the required ball rotational and translational velocity in the given plane.
Z Chara, Pavel Vlasák
exaly +3 more sources
The mutual influence of translational and rotational spherical particle movements in calm water was studied using experimental data and numerical simulation. Spherical balls with a density close to that of water were speeded up in special devices, which ensured the required ball rotational and translational velocity in the given plane.
Z Chara, Pavel Vlasák
exaly +3 more sources
A Multibody Dynamic Model of Drillstring for Torque and Drag Analysis
Journal of Offshore Mechanics and Arctic Engineering, 2015Excessive torque and drag in the wellbore can result in the buckling and the failure of the drillstring. Accurate predicting torque and drag is important in drilling operations. Due to the nature of the drilling, determination of torque and drag is a dynamic problem.
Caijin Yang, Ren Gexue, Gexue Ren
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Torque and Drag Calculations in Multilateral Wells
SPE Nigeria Annual International Conference and Exhibition, 2022Abstract Multilateral drilling technology has advanced to the point that it is now feasible to explore and extract resources from previously unprofitable reservoirs. It may also help to enhance field development management by allowing for more efficient fluid flow from the formation.
Darlington Etaje +2 more
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SPE Annual Technical Conference and Exhibition, 2020
Abstract It is generally acceptable to use soft string model for simple wells and stiff string for high dogleg wells. But these models fail to reveal the complex mechanical behaviors of tubular string in tripping in, tripping out, and sliding drilling operations with time as some segments of tubular string may move upward and downward ...
Robello Samuel, Wenjun Huang
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Abstract It is generally acceptable to use soft string model for simple wells and stiff string for high dogleg wells. But these models fail to reveal the complex mechanical behaviors of tubular string in tripping in, tripping out, and sliding drilling operations with time as some segments of tubular string may move upward and downward ...
Robello Samuel, Wenjun Huang
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Drillstring Analysis With a Discrete Torque/Drag Model
SPE Drilling & Completion, 2013Summary The only standard drillstring model in use today is the torque/drag model because of its simplicity and general availability. Field experience indicates that this model generally gives good results but sometimes performs poorly.
Robert F. Mitchell +2 more
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