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 second-phase particles and mechanical properties of the joint along the thickness of plate during friction stir welded 2219 aluminum alloy thick plate using different shapes pin were investigated.
76 citations
TL;DR: In this paper, the wake structure behind a vertical axis wind turbine was measured in a wind tunnel using particle imaging velocimetry (PIV) and computed with large-eddy simulation (LES).
76 citations
TL;DR: In this article, microstructural changes and mechanical properties during friction stir welding of AA7075-T6 have been investigated and the results show that the rotational and longitudinal speeds have a significant effect on the microstructures as well as the mechanical behavior of the welded material while a fine grain structure is produced at higher ratio of rotational speed to longitudinal speed.
Abstract: In this study, microstructural changes and mechanical properties during friction stir welding of AA7075-T6 have been investigated. Friction stir welding at relatively high rotational speeds ranging from 1000 to 1400 rpm and longitudinal speeds in the range of 40 to 80 mm/min have been performed and then microstructures and mechanical properties of the weldments have been studied. The results show that the rotational and longitudinal speeds have a significant effect on the microstructures as well as the mechanical behavior of the welded material while a fine grain structure is produced at higher ratio of rotational speed to longitudinal speed. On the other hand, for a given longitudinal speed, it is revealed that there is an optimum rotational speed which gives the highest tensile strength and elongation for the stirred zone.
76 citations
Patent•
15 Jun 1993TL;DR: In this article, a multi-plate clutch mechanism is interposed between the hollow axle and a differential case, and drive torque is fed from one of the differential case and the other member rotating at a higher speed.
Abstract: Between an input shaft and each of left-wheel and right-wheel axles, a speed change mechanism and a multi-plate clutch mechanism are interposed so that a rotational speed of the axle is changed (for example, increased) by a speed change mechanism and is transmitted to a hollow axle. The multi-plate clutch mechanism is interposed between the hollow axle and a differential case. By coupling the multi-plate clutch mechanism, drive torque is fed from one of the differential case and the hollow axle, said one member rotating at a higher speed, to the other member rotating at a lower speed. When the ratio α of a rotational speed of the left wheel to that of the right wheel becomes greater than the predetermined value α0 and transfer of torque in a desired direction is no longer feasible. The multi-plate clutch mechanisms are hence made free. The multi-plate clutch mechanisms are controlled by a control unit.
76 citations
TL;DR: In this article, the structure of the laminar-turbulent transition region for the three-dimensional boundary layer along a 30° cone rotating in external axial flow is investigated.
Abstract: The purpose of the present paper is to investigate the structure of the laminar–turbulent transition region for the three-dimensional boundary layer along a 30° cone rotating in external axial flow. Spiral vortices, which were assumed as small disturbances in the present stability analysis, are observed experimentally in the transition region. The process of transition to a turbulent boundary layer is visualized in detail. When the ratio of rotational speed to external axial flow is increased, the critical and transition Reynolds numbers decrease remarkably. The spiral angle and the number of vortices appearing on the cone decrease as the rotational speed ratio is increased.
76 citations