The Experts below are selected from a list of 7665 Experts worldwide ranked by ideXlab platform
Weifang Chen - One of the best experts on this subject based on the ideXlab platform.
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Thermal performances on angular contact ball bearing of high-speed spindle considering structural constraints under oil-Air Lubrication
Tribology International, 2017Co-Authors: Dexing Zheng, Weifang ChenAbstract:To predict thermal behaviors of high-speed angular contact ball bearings is essential for operating precision. Particularly, the characteristics of high-speed angular contact ball bearings depend on their thermal performances. However, most researchers only considered the convection effect between housings and ambient Air, whereas the coolant/lubricant and specific structural constraints effect were not integrated. In this investigation, the load equilibrium model of angular contact ball bearings with thermal expansion was first established to calculate bearing loads. The coolant/lubricant, radial and axial structural constraints and assembly constraints were fully taken into account to study the heat generation and transfer of bearings, and then a novel muti-node thermal network model for angular contact ball bearings was proposed. Applying this muti-node model, an integrated comprehensive thermal grid model for the front bearing of high-speed spindle and its surroundings was established to forecast the bearing temperature. Next Euler's method was employed to solve the equations by Matlab and the node temperature was calculated. Finally, the bearing temperature rise was tested and the comparative analysis was made with the numerical results. The results indicate that both series of results agree well. So, the thermal grid model established is verified.
Li Miaomiao - One of the best experts on this subject based on the ideXlab platform.
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an optimized thermal network model to estimate thermal performances on a pAir of angular contact ball bearings under oil Air Lubrication
Applied Thermal Engineering, 2018Co-Authors: Zheng Dexing, Chen Weifang, Li MiaomiaoAbstract:Abstract To estimate thermal performances of angular contact ball bearings is essential for operating precision and service life of angular contact ball bearings. However, a simple and accurate model estimating the bearing temperature is needed but absent so far. Considering the centrifugal force, gyroscopic moment and thermal expansion, ball loads equilibrium model was first established to analyze the bearing loads. The radial and axial heat transfer, especially the effect of structural constraints on bearings temperature was well characterized as well as the bearing mounting arrangement, and then an enhanced node planning scheme was proposed. With their surroundings considered, an optimized thermal grid model for a pAir of front bearings mounted in the high-speed spindle was developed by using this scheme. Next Newton-Raphson method was employed to obtain the numerical solution by Matlab. The bearing temperature variation, moreover, was tested to validate the developed model. The results indicate that both series of results agree well. Compared with the presented models, the deviation between the calculation results and the test values is reduced to less than 9%. As a result, the bearing temperature rise can be better forecasted, which may be beneficial to improve bearing operating accuracy as well as bearing service life.
Yongsheng Zhu - One of the best experts on this subject based on the ideXlab platform.
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Structural optimization of Lubrication device for high speed angular contact ball bearing based on internal fluid flow analysis
International Journal of Heat and Mass Transfer, 2016Co-Authors: Ke Yan, Yatai Wang, Jinhua Zhang, Jun Hong, Yongsheng ZhuAbstract:Lubrication performance is crucial for operating and frictional feature of high speed rolling bearing. In this paper, for B7008C angular contact ball bearing under outer ring guiding condition, the internal fluid flow and pressure distribution were investigated in condition of oil-Air Lubrication. The fluid flow characteristics inside bearing cavity and contact area were analyzed. Based on this, the oil-Air flow and Lubrication performance of two types of Lubrication devices were discussed, and the key structural parameters were investigated and improved. Finally, the optimal oil-Air supplying parameters and operating performance of the two devices were obtained via experimental testing. The limiting rotation speed of the specific B7008C bearing was improved by 6.0 ?? 103 r/min with the optimal Lubrication device structure.
Dexing Zheng - One of the best experts on this subject based on the ideXlab platform.
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Thermal performances on angular contact ball bearing of high-speed spindle considering structural constraints under oil-Air Lubrication
Tribology International, 2017Co-Authors: Dexing Zheng, Weifang ChenAbstract:To predict thermal behaviors of high-speed angular contact ball bearings is essential for operating precision. Particularly, the characteristics of high-speed angular contact ball bearings depend on their thermal performances. However, most researchers only considered the convection effect between housings and ambient Air, whereas the coolant/lubricant and specific structural constraints effect were not integrated. In this investigation, the load equilibrium model of angular contact ball bearings with thermal expansion was first established to calculate bearing loads. The coolant/lubricant, radial and axial structural constraints and assembly constraints were fully taken into account to study the heat generation and transfer of bearings, and then a novel muti-node thermal network model for angular contact ball bearings was proposed. Applying this muti-node model, an integrated comprehensive thermal grid model for the front bearing of high-speed spindle and its surroundings was established to forecast the bearing temperature. Next Euler's method was employed to solve the equations by Matlab and the node temperature was calculated. Finally, the bearing temperature rise was tested and the comparative analysis was made with the numerical results. The results indicate that both series of results agree well. So, the thermal grid model established is verified.
Zheng Dexing - One of the best experts on this subject based on the ideXlab platform.
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an optimized thermal network model to estimate thermal performances on a pAir of angular contact ball bearings under oil Air Lubrication
Applied Thermal Engineering, 2018Co-Authors: Zheng Dexing, Chen Weifang, Li MiaomiaoAbstract:Abstract To estimate thermal performances of angular contact ball bearings is essential for operating precision and service life of angular contact ball bearings. However, a simple and accurate model estimating the bearing temperature is needed but absent so far. Considering the centrifugal force, gyroscopic moment and thermal expansion, ball loads equilibrium model was first established to analyze the bearing loads. The radial and axial heat transfer, especially the effect of structural constraints on bearings temperature was well characterized as well as the bearing mounting arrangement, and then an enhanced node planning scheme was proposed. With their surroundings considered, an optimized thermal grid model for a pAir of front bearings mounted in the high-speed spindle was developed by using this scheme. Next Newton-Raphson method was employed to obtain the numerical solution by Matlab. The bearing temperature variation, moreover, was tested to validate the developed model. The results indicate that both series of results agree well. Compared with the presented models, the deviation between the calculation results and the test values is reduced to less than 9%. As a result, the bearing temperature rise can be better forecasted, which may be beneficial to improve bearing operating accuracy as well as bearing service life.