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Rotational speed

About: Rotational speed is a research topic. Over the lifetime, 23327 publications have been published within this topic receiving 151696 citations. The topic is also known as: speed of revolution & revolution rate.


Papers
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Journal ArticleDOI
25 Feb 2014
TL;DR: The results of this study reveal that the high-speed drilling of 6000–7000 r/min may effectively reduce the two parameters of maximum cortical temperature and duration of exposure at temperatures above the allowable levels, which in turn reduce the probability of thermal necrosis in the drill site.
Abstract: Bone loss due to thermo necrosis may weaken the purchase of surgically placed screws and pins, causing them to loosen postoperatively. The heat generated during the bone drilling is proportional to cutting speed and force and may be partially dissipated by the blood and tissue fluids, and somehow carried away by the chips formed. Increasing cutting speed will reduce cutting force and machining time. Therefore, it is of interest to study the effects of the increasing cutting speed on bone drilling characteristics. In this article, the effects of the increasing cutting speed ranging from 500 up to 18,000 r/min on the thrust force and the temperature rise are studied for bovine femur bone. The results of this study reveal that the high-speed drilling of 6000-7000 r/min may effectively reduce the two parameters of maximum cortical temperature and duration of exposure at temperatures above the allowable levels, which in turn reduce the probability of thermal necrosis in the drill site. This is due to the reduction of the cutting force and the increase in the chip disposal speed. However, more increases in the drill bit rotational speed result in an increase in the amount of temperature elevation, not because of sensible change in drilling force but a considerable increase in friction among the chips, drill bit and the hole walls.

34 citations

Journal ArticleDOI
TL;DR: In this article, a theoretical investigation has been carried out to study the combined effect of rotation speed modulation and internal heating on thermal instability in a temperature dependent viscous horizontal fluid layer.

34 citations

Patent
27 May 2005
TL;DR: In this paper, the phase difference between a rotational speed signal and a direction of rotation signal is detected by means of a phase difference measure, i.e., the difference between the phase of the signal and the direction of the rotation of the rotor.
Abstract: The invention relates to a rotary encoder and to a method for detecting disturbances in such a rotary encoder. In this case, vibrations or other disturbances are detected by means of the phase difference between a rotational speed signal, which represents a rotational speed of a rotor, and a direction of rotation signal, which represents a direction of rotation of the rotor.

34 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of sweeping rotation speed, primary rotation speed and impeller diameter on the mixing quality and mixing rate of a Nauta blender was studied using the discrete element method.

34 citations

Patent
13 May 1976
TL;DR: In this article, a torque converter is interconnected between the fan and core rotor of a turbofan engine such that the speed of the core rotor can be boosted from windmill speed to a speed sufficient to allow an in-flight start by selectively extracting power from the windmilling fan during the start sequence of the engine.
Abstract: A torque converter is interconnected between the fan and core rotor of a turbofan engine such that the speed of the core rotor can be boosted from windmill speed to a speed sufficient to allow an in-flight start by selectively extracting power from the windmilling fan during the start sequence of the engine. Control logic is included to automatically drain the oil from, and thereby unload, the torque converter whenever the engine is in the operating speed region. Further assurance is provided by an overrunning clutch which decouples the system when the core rotational speed exceeds the converter output.

34 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023539
20221,195
2021522
2020773
20191,092
20181,138