扇形推力轴承边界滑移区域的优化设计  

Boundary Slippage Region Optimization Design for Sectorial Thrust Bearing

作　　者：代松杰 张辉[1,2] 陈佳伟[1,2] 缑翰驰 郭世理 董光能 DAI Songjie;ZHANG Hui;CHEN Jiawei;GOU Hanchi;GUO Shili;DONG Guangneng(Key Laboratory of Education Ministry for Modern Design&Rotor-Bearing System,Xi'an Jiaotong University,Xi'an 710049)

机构地区：[1]西安交通大学现代设计及转子轴承系统教育部重点实验室,西安710049 [2]西安交通大学设计科学与基础部件研究所,西安710049

出　　处：《机械工程学报》2024年第21期196-206,共11页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(52075418)。

摘　　要：基于二元滑移模型,以低摩擦因数为优化目标,采用遗传算法对扇形推力轴承的边界滑移区域进行优化,讨论对比了具有无滑移、全滑移、半滑移和优化滑移表面的扇形推力轴承摩擦性能并揭示了作用机理,分析了轴承的宽度、收敛率和滑移长度对改善摩擦性能的影响规律,并对四种不同的滑移表面开展了摩擦学实验。结果表明:通过对扇形推力轴承边界滑移区域优化,得到了非对称阶梯型边界滑移区域优化方案,且该优化区域在轴承入口处沿润滑油流动方向逐渐变窄;这种优化滑移表面的承载力较无滑移、全滑移和半滑移表面分别提高了96.1%、279.5%和8.7%,摩擦因数分别降低了58.0%、59.8%和13.2%,其作用机理在于优化滑移表面增加了入口处润滑油的流量,增强了流体动压效应;对于较小宽度、较小收敛率和较大滑移长度的扇形推力轴承,这种非对称阶梯型边界滑移表面可显著提高轴承的摩擦性能;通过销-盘摩擦学实验验证了优化滑移表面较其他三种滑移表面具有较小的摩擦因数,这对于扇形推力轴承的设计和工程应用具有参考价值。Based on the two-component slippage model,the Genetic Algorithm is used to optimize the boundary slippage region of sectorial thrust bearing with the objective of low friction coefficient.The tribological properties of sectorial thrust bearing with whole no-slippage,whole slippage,half-slippage and optimized slippage surface are discussed and compared,and the mechanism is revealed.Meanwhile,the influence of width,convergence rate and slippage length of bearing on the improvement of tribological performance is analyzed,and tribological experiments of four different slippage surfaces are conducted.The results show that an asymmetric stepped trapezoidal boundary slippage region optimization scheme is obtained by optimizing the boundary slippage region of sectorial thrust bearing,and the optimized region narrows gradually along the direction of lubricating oil flow at the bearing inlet;The bearing capacity of the optimized slippage surface is increased by 96.1%,279.5%and 8.7%,and the friction coefficient is decreased by 58.0%,59.8%and 13.2%,respectively,compared with that of whole no-slippage,whole slippage and half-slippage surface.The mechanism may be that the optimized slippage surface increases the flow of inlet lubricating oil and enhances the hydrodynamic pressure effect.For sectorial thrust bearings with smaller width,smaller convergence rate and larger slippage length,this asymmetric stepped trapezoidal boundary slippage surface can significantly improve the tribological properties.The optimized slippage surface has been verified to have a smaller friction coefficient compared to the other three slippage surfaces through tribological experiments,which has reference value for the design and engineering application of sectorial thrust bearings.

关 键 词：扇形推力轴承 边界滑移 遗传算法 优化设计 摩擦学特性 

分 类 号：TH117[机械工程—机械设计及理论]