径向水润滑滑动轴承动静态特性的有限差分法分析

Influence of Bearing Structure on Dynamic and Static Characteristics of Water-lubricated Journal Bearings

本文基于有限差分法利用MATLAB编程研究了轴承型式(圆柱轴承、椭圆轴承、三叶轴承)、水槽布置方式、长径比和半径间隙对水润滑轴承动静态特性的影响。结果表明,三种轴承中圆柱轴承的承载能力最强,但动态性能欠佳;三叶轴承的动态性能最好,但承载能力最差;椭圆轴承性能则介于两种轴承之间。且均布式水槽的数量越多,轴承的承载能力越低。增加轴承长径比可以提高半圆槽式轴承承载能力,但会降低轴承的动态性能。存在能够使半圆槽式轴承承载能力达到最大且最佳的半径间隙值,是当半径间隙大于该值时,增加半径间隙会降低轴承的承载能力,但轴承的动态性能会有所提高。

Based on the finite difference method(FDM),the influence of bearing type(cylindrical,elliptical and three-lobe bearings),water groove,aspect ratio and radial clearance on the dynamic and static characteristics of water-lubricated journal bearings was analyzed via MATLAB.The results show that the cylindrical bearings have the highest load-carrying capacity but poor dynamic performance.The dynamic performance of three-lobe bear-ings is the best,but their load-carrying capacity is the worst.Elliptical bearings possess intermediate dynamic and static characteristics.For cylindrical bearings,the more the number of water grooves,the lower the load-carrying capacity,except the semicircle grooved bearings.For the semicircle grooved bearings,the load-carrying capacity can be enhanced by increasing the aspect ratio(LD),even though the dynamic performance is lowered.There is an optimal radial clearance that can obtain the maximum load-carrying capacity.Lager radial clearance will de-crease the load-carrying capacity but enhance the dynamic performance.