Results 71 to 80 of about 56,758 (188)
Modelling of cup anemometry and dynamic overspeeding in average wind speed measurements [PDF]
Atmospheric Measurement TechniquesCup anemometers measure average wind speed in the atmosphere and have been used for one and a half centuries by meteorologists. Within the last half century, cup anemometers have been used extensively in wind energy to measure wind resources and ...
T. F. Pedersen, J.-Å. Dahlberg
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Anatomy of a bearing torque problem [PDF]
In the early 1970s, an antenna despin drive was developed for MBB solar science satellite HELIOS. A problem with high bearing drag torque that was encountered on the two flight models of this drive, after successful tests were completed on twelve ...
Phinney, Damon D.
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Shiyou jixie, 2019 To address the problems of difficult trajectory control, high torque and drag and serious regional lost circulation on Bohai 2-2 artificial island of Dagang Oilfield, based on the analysis of drilling difficulties, targeting the well trajectory control ...
Wang Jianlong +6 more
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Journal of Fluid Science and Technology, 2015 The characteristics of a straight-bladed Darrieus turbine (Gyro-mill turbine) with elastic blades are experimentally studied. The same structured turbine with rigid blades is also studied for comparison.
Tomoya NAKAJIMA +3 more
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All-propulsion design of the drag-free and attitude control of the European satellite GOCE
, 2009 This paper concerns the drag-free and attitude control (DFAC) of the European Gravity field and steady-state Ocean Circulation Explorer satellite (GOCE), during the science phase.
Canuto +18 more
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Drag, lift and torque coefficients for ellipsoidal particles
, 2013 In this work, we want to verify the ability of the CFD code Ansys Fluent© to give an accurate prediction of hydrodynamic forces acting on non-spherical (Ellipsoids). We focus the present study only on the drag and lift forces and also on the pitching torque.
Khalij, Mohammed +3 more
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Sensitivity analysis of factors affecting torque and drag modelling
, 2014 As the modern day extended reached wells are getting longer and more complex, the torque and drag is one of the restraining aspects for achieving the target depth. Torque and drag becomes a precarious issue, for example it can be difficult to land the long completion string.
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Effect of blade planform variation on the forward-flight performance of small-scale rotors [PDF]
An investigation was conducted in the Glenn L. Martin Wind Tunnel to determine the effect of blade planform variation on the forward-flight performance of four small-scale rotors.
Althoff, Susan L. +3 more
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Jixie chuandong, 2018 In order to accurately predict the internal flow field and drag torque characteristics of the hydro-viscous clutch,with the flow field of double circular groove clearance as the research object,based on the principle of hydrodynamics and the Newtonian ...
Sun Chunlian
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Summarization: Drilling through the subsurface is a complex operation and problems are almost guaranteed to occur. Therefore, understanding and anticipating drilling problems, understanding their causes and planning solutions are necessary for successfully reaching the target. The most prevalent drilling problems include pipe sticking, lost circulation,
Azeez Mustafa(http://users.isc.tuc.gr/~mazeez) +1 more
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