Topic
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.
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TL;DR: In this paper, the effect of rotational and welding speed on the residual stresses of dissimilar friction stir welds of aluminum alloys AA2024-T3 and AA6061-T6 were studied using X-ray Diffraction.
44 citations
TL;DR: In this paper, the effects of flywheel geometry on its energy storage/deliver capability per unit mass, further defined as Specific Energy, are explored. And the proposed chain of finite element analysis and optimization procedure results show that smart design of fly wheel geometry could both have a significant effect on the Specific Energy performance and reduce the operational loads exerted on the shaft/bearings due to reduced mass at high rotational speeds.
44 citations
Patent•
17 Sep 1986
TL;DR: In this paper, a rotary sprinkler head comprising a sprinkler body devoid of any operative dynamic seals is provided for communicating a source of water under pressure with an outlet for directing water underpressure communicated therewith into an atmospheric condition in a primary stream having a generally vertically extending axis.
Abstract: A rotary sprinkler head comprising a sprinkler body devoid of any operative dynamic seals for communicating a source of water under pressure with an outlet for directing water under pressure communicated therewith into an atmospheric condition in a primary stream having a generally vertically extending axis. A rotary distributor is provided which has surfaces for engaging the primary stream (1) to establish a reactionary force component acting on the distributor in a direction tangential to the rotational axis thereof so as to effect rotational movement thereof about its axis of rotation and (2) to direct the primary stream engaged thereby in the form of a pattern forming stream or streams including at least one stream moving away from the distributor in a direction having a substantial component extending outwardly from the generally vertical axis of the primary stream so as to define the radius of the circular spray pattern. A speed reducing assembly is operatively associated with the distributor for reducing the rotational speed of the distributor resulting from the reactionary force component from a relatively high whirling speed which would occur without the speed reducing assembly to a relatively slow speed.
44 citations
TL;DR: The proposed power converter allows reduction of the switching losses, especially in a low-speed range, as well as eliminates energy intake from source during the energy discharge process, and as a result the efficiency of drive can be increased in the entire range of rotational speed.
Abstract: This study presents a new power converter for switched reluctance motor-based drives. In comparison with the standard power systems, the proposed one allows reduction of the switching losses, especially in a low-speed range, as well as eliminates energy intake from source during the energy discharge process. As a result the efficiency of drive can be increased in the entire range of rotational speed. The computer model of the drive and a detailed study on relationships between the output power and the rotational speed for a sample two-phase motor-based drive are presented. To verify simulations results the measurements on the laboratory test-stand are carried out.
44 citations
Patent•
30 Mar 2010TL;DR: In this paper, a rotational angle-measurement with high accuracy is provided through electric correction of the rotation shaft by rotating the shaft at a constant speed with a known rate of change.
Abstract: A rotational angle-measurement apparatus with high accuracy is provided through electric correction of the rotational angle-measurement apparatus by rotating the rotation shaft at a constant speed. The rotational angle-measurement apparatus includes an electric motor having a rotation shaft, a magnet mounted on one end of the rotation shaft, and a magnetic sensor with an output signal that changes in accordance with an orientation of a magnetic field surrounding the magnetic sensor. The magnetic sensor outputs an angle signal representing the rotational angle of the rotation shaft, and the correction procedure utilizes rotation of the electric motor shaft through more than one revolution at a rotational speed with a known rate of change.
44 citations