Results 251 to 260 of about 8,055 (288)
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Oscillatory Drag, Lift, and Torque on a Circular Cylinder in a Uniform Flow
The Physics of Fluids, 1972Numerical solutions of the equations governing time-dependent, viscous, incompressible fluid flow past a circle are presented for Reynolds numbers 100, 400, and 1000. These solutions show the dramatic rise of the drag coefficient during the development of the Kármán vortex street and reveal the oscillatory character of the drag, lift, and torque that ...
Jordan, Stanley K., Fromm, Jacob E.
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Drag Torque in Disk Brakes: Significance, Measurement and Challenges
SAE International Journal of Commercial Vehicles, 2015<div class="section abstract"><div class="htmlview paragraph">Drag torque is generated in disk brakes as a result of contact (dynamic friction) between brake disk and brake pads when the braking system is not actuated. Among the negative implications of drag torque are, notably, dispensable additional fuel consumption as well as increased ...
Achim Reich, Angelo Sarda, Martin Semsch
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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.
Yang Caijin +4 more
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Calculation of Drag Torque Losses by Component of a Transfer Case
SAE Technical Paper Series, 2019<div class="section abstract"><div class="htmlview paragraph">In recent decades, fuel economy has become a key indicator of an automaker corporate social responsibility and a market differentiation factor, and ultimately it is regulated by government agencies such as EPA through CO<sub>2</sub> emissions compliance tests.
Ricardo Rivera Rodriguez +1 more
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Analysis of Wet Clutch Drag Torque and Optimization of Drag Torque Reduction Measures
2023Dongyue Qu, Yunpeng Yun, Dongpeng Zhao
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Quantifying Tortuosities by Friction Factors in Torque and Drag Model
SPE Annual Technical Conference and Exhibition, 2002Abstract Tortuosity occurs when a well deviates from a straight hole. The most commonly known tortuosity is the local dogleg severity variation associated with the use of steerable motors in "slide/drill/slide" drilling. However, there is a tortuosity that exists in many wells, which the authors will refer to as "micro-tortuosity" in ...
Tom Gaynor +3 more
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Effect of Steerable BHA on Drag and Torque In Wells
European Petroleum Conference, 1990Abstract Steerable bottom hole assemblies are often used when drilling deviated wells. Planning of such deviated wells often include studies of torque and drag calculations for the planned well-path and BHA's in order to have a fairly good idea of friction and torque to be encountered when drilling.
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Flight Dynamics of Boomerangs: Impact of Drag Force and Drag Torque
AIAA AVIATION 2020 FORUM, 2020Prasad Gudem +5 more
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A Numerical Simulation for Predicting the Gear Drag Torque
Transactions of the Korean Society of Mechanical Engineers - B, 2020Jongrak Choi, Nahmkeon Hur
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Residual Drag Torque on Magnetically Suspended Rotating Spheres
Review of Scientific Instruments, 1972An almost quantitative explanation of the residual drag torque on freely spinning steel spheres in magnetic suspension is given by comparing previously published experimental data with theoretical results of Keith (1963). Accordingly, the residual drag torque is mainly caused by the earth's rotation.
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