The Experts below are selected from a list of 61566 Experts worldwide ranked by ideXlab platform
Meipeng Zhong - One of the best experts on this subject based on the ideXlab platform.
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Trajectory analysis and experiments of both-sides Cylindrical lapping in eccentric rotation
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Ju Long Yuan, Zhixiang Chen, Fenfen Zhou, Tianchen Zhao, Meipeng ZhongAbstract:In this paper, the both-sides lapping in eccentric rotation is proposed to fine-finish the Cylindrical Surface of a batch of bearing rollers. The geometry and kinematics of the workpiece are theoretically analyzed, the trajectory on the Cylindrical Surface is simulated, and the trajectory distribution is evaluated quantitatively by calculating the standard deviation of trajectory’s density; in addition, a good speed combination is found based on the trajectory analysis. Finally, lapping experiments on AISI 52100 bearing steel Cylindrical rollers were carried out, achieving an average roundness of 0.43 μm, with a deviation of 0.13 μm, and a minimum of 0.31 μm for the batch. It is indicated that the use of smaller sized abrasives achieves better roundness in Cylindrical lapping. The Surface topography was shaped like a regular net, which largely coincides with the simulation results.
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kinematics and trajectory of both sides Cylindrical lapping process in planetary motion type
International Journal of Machine Tools & Manufacture, 2015Co-Authors: Ju Long Yuan, Zhixiang Chen, Ping Zhao, Meipeng ZhongAbstract:Abstract The both-sides lapping process in planetary motion type is proposed in this paper to lap and polish the Cylindrical Surface of bearing roller. The rolling speed of roller is the key kinematical parameter that affects the generation of Cylindrical Surface of roller. Through analysis of friction forces and pure rolling motion, it was discovered that the rolling speed of roller only depends on the rotation speed of lower plate rather than upper plate. Based on the above result, the geometry and kinematics of workpiece in this method is described, and the functions are proved valid by an experiment in which the rolling speed of roller is observed in video. By theoretical tests under different speed conditions, it is indicated that the roller's rolling speed varies with respect to time along a nonstandard cosine curve with an offset, its amplitude depends on the speeds of lower plate rotation and carrier circulation, and its offset depends on the speeds of lower plate rotation and carrier rotation. Based on geometry and kinematics, the trajectories on the Cylindrical Surface of roller and on the flat Surface of plate are both described and simulated. The standard deviation and the range of path curve length distribution density are applied to numerically evaluate and analyze the trajectory distribution. The effect of speed parameters on the trajectory distribution, and the generation of trajectory with respect to time are investigated.
Venkateswaran Narayanaswamy - One of the best experts on this subject based on the ideXlab platform.
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investigation of Surface curvature effects on unseparated fin shock wave boundary layer interactions
AIAA Journal, 2020Co-Authors: Joshua Pickles, Venkateswaran NarayanaswamyAbstract:The effect of three-dimensional (3-D) relief from Surface curvature on a shock/boundary-layer interaction (SBLI) is investigated by mounting a sharp fin on a Cylindrical Surface. The test article c...
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on the mean structure of sharp fin induced shock wave turbulent boundary layer interactions over a Cylindrical Surface
Journal of Fluid Mechanics, 2019Co-Authors: Joshua Pickles, Balachandra R Mettu, Pramod K Subbareddy, Venkateswaran NarayanaswamyAbstract:Interactions between an oblique shock wave generated by a sharp fin placed on a Cylindrical Surface and the incoming boundary layer are investigated to unravel the mean features of the resulting shock/boundary layer interaction (SBLI) unit. This fin-on-cylinder SBLI unit has several unique features caused by the three-dimensional (3-D) relief offered by the Cylindrical Surface that noticeably alter the shock structure. Complementary experimental and computational studies are made to delineate both the Surface and off-body flow features of the fin-on-cylinder SBLI unit and to obtain a detailed understanding of the mechanisms that dictate the mean flow and wall pressure features of the SBLI unit. Results show that the fin-on-cylinder SBLI exhibits substantial deviation from quasi-conical symmetry that is observed in planar fin SBLI. Furthermore, the separated flow growth rate appears to decrease with downstream distance and the separation size is consistently smaller than the planar fin SBLI with the same inflow and fin configurations. The causes for the observed diminution of the separated flow and its downstream growth rate were investigated in the light of changes caused by the cylinder curvature on the inviscid as well as separation shock. It was found that the inviscid shock gets progressively weakened in the region close to the triple point with downstream distance due to the 3-D relief effect from cylinder curvature. This weakening of the inviscid shock feeds into the separation shock, which is also independently impacted by the 3-D relief, to result in the observed modifications in the fin-on-cylinder SBLI unit.
Ju Long Yuan - One of the best experts on this subject based on the ideXlab platform.
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Trajectory analysis and experiments of both-sides Cylindrical lapping in eccentric rotation
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Ju Long Yuan, Zhixiang Chen, Fenfen Zhou, Tianchen Zhao, Meipeng ZhongAbstract:In this paper, the both-sides lapping in eccentric rotation is proposed to fine-finish the Cylindrical Surface of a batch of bearing rollers. The geometry and kinematics of the workpiece are theoretically analyzed, the trajectory on the Cylindrical Surface is simulated, and the trajectory distribution is evaluated quantitatively by calculating the standard deviation of trajectory’s density; in addition, a good speed combination is found based on the trajectory analysis. Finally, lapping experiments on AISI 52100 bearing steel Cylindrical rollers were carried out, achieving an average roundness of 0.43 μm, with a deviation of 0.13 μm, and a minimum of 0.31 μm for the batch. It is indicated that the use of smaller sized abrasives achieves better roundness in Cylindrical lapping. The Surface topography was shaped like a regular net, which largely coincides with the simulation results.
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kinematics and trajectory of both sides Cylindrical lapping process in planetary motion type
International Journal of Machine Tools & Manufacture, 2015Co-Authors: Ju Long Yuan, Zhixiang Chen, Ping Zhao, Meipeng ZhongAbstract:Abstract The both-sides lapping process in planetary motion type is proposed in this paper to lap and polish the Cylindrical Surface of bearing roller. The rolling speed of roller is the key kinematical parameter that affects the generation of Cylindrical Surface of roller. Through analysis of friction forces and pure rolling motion, it was discovered that the rolling speed of roller only depends on the rotation speed of lower plate rather than upper plate. Based on the above result, the geometry and kinematics of workpiece in this method is described, and the functions are proved valid by an experiment in which the rolling speed of roller is observed in video. By theoretical tests under different speed conditions, it is indicated that the roller's rolling speed varies with respect to time along a nonstandard cosine curve with an offset, its amplitude depends on the speeds of lower plate rotation and carrier circulation, and its offset depends on the speeds of lower plate rotation and carrier rotation. Based on geometry and kinematics, the trajectories on the Cylindrical Surface of roller and on the flat Surface of plate are both described and simulated. The standard deviation and the range of path curve length distribution density are applied to numerically evaluate and analyze the trajectory distribution. The effect of speed parameters on the trajectory distribution, and the generation of trajectory with respect to time are investigated.
Joshua Pickles - One of the best experts on this subject based on the ideXlab platform.
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investigation of Surface curvature effects on unseparated fin shock wave boundary layer interactions
AIAA Journal, 2020Co-Authors: Joshua Pickles, Venkateswaran NarayanaswamyAbstract:The effect of three-dimensional (3-D) relief from Surface curvature on a shock/boundary-layer interaction (SBLI) is investigated by mounting a sharp fin on a Cylindrical Surface. The test article c...
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on the mean structure of sharp fin induced shock wave turbulent boundary layer interactions over a Cylindrical Surface
Journal of Fluid Mechanics, 2019Co-Authors: Joshua Pickles, Balachandra R Mettu, Pramod K Subbareddy, Venkateswaran NarayanaswamyAbstract:Interactions between an oblique shock wave generated by a sharp fin placed on a Cylindrical Surface and the incoming boundary layer are investigated to unravel the mean features of the resulting shock/boundary layer interaction (SBLI) unit. This fin-on-cylinder SBLI unit has several unique features caused by the three-dimensional (3-D) relief offered by the Cylindrical Surface that noticeably alter the shock structure. Complementary experimental and computational studies are made to delineate both the Surface and off-body flow features of the fin-on-cylinder SBLI unit and to obtain a detailed understanding of the mechanisms that dictate the mean flow and wall pressure features of the SBLI unit. Results show that the fin-on-cylinder SBLI exhibits substantial deviation from quasi-conical symmetry that is observed in planar fin SBLI. Furthermore, the separated flow growth rate appears to decrease with downstream distance and the separation size is consistently smaller than the planar fin SBLI with the same inflow and fin configurations. The causes for the observed diminution of the separated flow and its downstream growth rate were investigated in the light of changes caused by the cylinder curvature on the inviscid as well as separation shock. It was found that the inviscid shock gets progressively weakened in the region close to the triple point with downstream distance due to the 3-D relief effect from cylinder curvature. This weakening of the inviscid shock feeds into the separation shock, which is also independently impacted by the 3-D relief, to result in the observed modifications in the fin-on-cylinder SBLI unit.
Yu V Zaslavsky - One of the best experts on this subject based on the ideXlab platform.
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oversized co axial and Cylindrical Surface wave oscillators with two dimensional periodical grating quasi optical model
Journal of Applied Physics, 2013Co-Authors: N S Ginzburg, A M Malkin, A S Sergeev, Yu V ZaslavskyAbstract:Within the quasi-optical approach, we study nonlinear dynamics of co-axial and Cylindrical Surface-wave oscillators with two-dimensional periodic gratings. Electromagnetic fields in these structures are formed by a superposition of coupled quasi-optical wave-beams propagating in the azimuthal and longitudinal directions. Presence of the azimuthal wave-beams leads to a substantial spectrum rarefication of the modes with different azimuthal indices thus allowing their selective excitation by a large radius rectilinear hollow electron beam.
