Results 1 to 10 of about 56,657 (189)
Novel Torque and Drag Model for Drilling Two-Dimensional High-Angle Wells. [PDF]
ACS Omega, 2022 Planning high-angle wells involves diverse areas; one of the most important of these areas is torque and drag (T&D) management. Not only could uncontrolled T&D cause various drilling problems like drill string (D/S) failures, casing wear, stuck pipes, and slow rates of penetration but it could also entirely stop the drilling progress, if torque and/or ...
Nour M +3 more
europepmc +4 more sources
A hybrid analytical and data driven framework for optimizing radially grooved wet clutch geometry. [PDF]
Sci RepIn wet clutch systems, the drag torque is generated by the relative motion between rotating disks in the presence of the oil film. This study aims to optimize the geometry of radially grooved wet clutches to minimize drag torque.
Sadafi M, Najafi AF, Jalali A.
europepmc +2 more sources
Torque and Drag Forces Problems in Highly Deviated Oil Well
Iraqi Journal of Chemical and Petroleum Engineering, 2018 Excessive torque and drag can be critical limitation during drilling highly deviated oil wells. Using the modeling is regarded as an invaluable process to assist in well planning and to predict and prevent drilling problems.
Hasan Ali Neamah +1 more
doaj +3 more sources
Viscous dynamics of Lyme disease and syphilis spirochetes reveal flagellar torque and drag. [PDF]
Biophys J, 2013 The spirochetes that cause Lyme disease (Borrelia burgdorferi) and syphilis (Treponema pallidum) swim through viscous fluids, such as blood and interstitial fluid, by undulating their bodies as traveling, planar waves. These undulations are driven by rotation of the flagella within the periplasmic space, the narrow (∼20-40 nm in width) compartment ...
Harman M +3 more
europepmc +4 more sources
Investigation of a staggered dual-rotor wound field synchronous motor for offshore wind turbine full-scale testing platforms. [PDF]
Sci RepThe development of high-fidelity testing platforms for offshore wind turbines necessitates drag motors capable of emulating complex marine operating conditions while maintaining ultralow torque ripple.
Xue Y +5 more
europepmc +2 more sources
Spin-transfer mechanism for magnon-drag thermopower [PDF]
, 2011 We point out a relation between the dissipative spin-transfer-torque parameter $\beta$ and the contribution of magnon drag to the thermoelectric power in conducting ferromagnets.
Duine, R. A. +3 more
core +17 more sources
Tribology in Industry, 2022 Drag torque in a disc brake is the residual torque when the brake is not activated. This torque can adversely influence the total energy consumption, life of the brake components, and level of airborne wear particles from vehicles.
Pontus Fyhr +2 more
doaj +1 more source
Method of suspender line trajectory design
Petroleum Exploration and Development, 2021 Based on the mechanical model of an elastic rod, a new trajectory design method was established. The advantages of the suspender line trajectory in reducing drag and torsion were compared, and the main controlling factors of drag and torque and their ...
Fan YU +5 more
doaj +1 more source
Machines, 2023 Wet friction clutch is the key functional component of the high-speed helicopter variable-speed transmission system, which is used to change the power transmission path.
Wuzhong Tan +3 more
doaj +1 more source
Experimental analysis of oil flow and drag torque generation in disengaged wet clutches
Scientific Reports, 2023 Fundamental knowledge of the oil flow in a disengaged wet clutch is essential for optimizing the cooling performance and the drag losses. However, no fundamental information on the oil flow and drag torque generation is available for dip-lubricated wet ...
Lukas Pointner-Gabriel +3 more
doaj +1 more source