Results 191 to 200 of about 4,383 (225)

Aeration in Lubrication With Application to Drag Torque Reduction

Journal of Tribology, 2011
The aeration of an oil film flowing between the faces of two closely spaced circular plates (one stationary, and one rotating) is examined experimentally, numerically, and with an improved lubrication model. The gap between the plates is small compared to their radii, making lubrication theory appropriate for modeling the flow.
Chinar R. Aphale, William W. Schultz, Steven L. Ceccio   +2 more
openaire   +1 more source

Torque and Drag Modeling for Horizontal Openhole Completions

Journal of Petroleum Technology, 2006
This article, written by Technology Editor Dennis Denney, contains highlights of paper SPE 97079, "Torque and Drag Modeling for Horizontal Openhole Completions," by R. Rezvani, Halliburton/Sperry Sun, and B. Techentien, Halliburton Energy Services Inc., prepared for the 2005 SPE Annual Technical Conference and Exhibition, Dallas, 9–12 October.
openaire   +1 more source

Drag Torque Measurement of Hard Disk Drive Spindle Motors

Asia-Pacific Magnetic Recording Conference 2006, 2006
The drag torque of a hard disk drive (HDD) is a key variable to its spindle motor. It should be accurately tested during R&D and mass productions of HDDs. This paper reviews its existing measurement methods currently used by HDD industry first. Then an effective method to measure the drag torque is introduced.
Q. Jiang, C. Bi, S. Lin
openaire   +1 more source

Residual Drag Torque on Magnetically Suspended Rotating Spheres

Review of Scientific Instruments, 1972
An 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.
openaire   +1 more source

Investigation of Magnetic Drag Torque in Permanent Magnet Brushless Motors

IEEE Transactions on Magnetics, 2007
In permanent magnet (PM) brushless motors, a magnetic drag torque, which results from the effect of magnetic hysteresis, exists at low speeds but is often neglected. However, in some applications it can have potentially serious consequences. In this paper, a practical method for predicting the magnetic drag torque in a PM brushless motor is presented ...
Y. S. Chen, Z. Q. Zhu
openaire   +1 more source

Analysis of Wet Clutch Drag Torque and Optimization of Drag Torque Reduction Measures

2023
Dongyue Qu, Yunpeng Yun, Dongpeng Zhao
openaire   +1 more source

Flight Dynamics of Boomerangs: Impact of Drag Force and Drag Torque

AIAA AVIATION 2020 FORUM, 2020
Prasad Gudem, Martin Laslett, Gino Carfano, Manuel Schütz, Kyle Holland, Hector Murguia   +5 more
openaire   +1 more source

Torque and Drag-Two Factors in Extended-Reach Drilling

Journal of Petroleum Technology, 1994
Summary This paper addresses the various aspects of torque and drag problems encountered in drilling extended-reach wells. It discusses how to use torque and drag calculations and measurements to plan long-reach well profiles, to execute drilling operations that minimize torque and drag effects, to monitor hole ...
openaire   +1 more source

Drag Torque Analysis of Wet Multi-Disc Clutch

The Proceedings of Mechanical Engineering Congress, Japan, 2021
Yuta OSAWA, Shayan Yu Yu, Takuma KATO
openaire   +1 more source

Predicting the Drag of Rough Surfaces

Annual Review of Fluid Mechanics, 2021
Daniel Chung, Nicholas Hutchins, Michael P Schultz   +2 more
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