CAJ | 학술논문

建立人字槽径向气体动压润滑轴承的数学模型，采用局部积分有限差分法在不连续求解域内推导出气体润滑Reynolds方程的差分形式，通过求解获得轴承间隙内的气膜厚度、气膜压力、轴承承载力等状态特性，并分析径向间隙、螺旋角、槽深比、槽宽比和槽数等轴承几何结构参数以及转速等工况条件变化对轴承承载能力的影响规律。结果表明：人字槽轴承的压力在圆周方向呈锯齿形分布，人字形压力带环抱在轴颈上，使轴承在各个方向上均能承载，从而提高了轴承的抗振性和平稳性；增大偏心率，减小气膜间隙，增大螺旋角，减小槽深，增加槽宽比，适当增加槽数，均可提高轴承承载力；人字槽结构能够更好地实现气体动压润滑轴承动压效应，提高了轴承的承载能力和稳定性能。
건립인자조경향기체동압윤활축승적수학모형，채용국부적분유한차분법재불련속구해역내추도출기체윤활Reynolds방정적차분형식，통과구해획득축승간극내적기막후도、기막압력、축승승재력등상태특성，병분석경향간극、라선각、조심비、조관비화조수등축승궤하결구삼수이급전속등공황조건변화대축승승재능력적영향규률。결과표명：인자조축승적압력재원주방향정거치형분포，인자형압력대배포재축경상，사축승재각개방향상균능승재，종이제고료축승적항진성화평은성；증대편심솔，감소기막간극，증대라선각，감소조심，증가조관비，괄당증가조수，균가제고축승승재력；인자조결구능구경호지실현기체동압윤활축승동압효응，제고료축승적승재능력화은정성능。
The mathematic model of herringbone grooved radial aerodynamic lubrication bearings was established,and the differential form of Reynolds equation of gas lubrication under oblique coordinate system was deduced by using finite differential method.The characteristics such as the film thickness,film pressure and load capacity inside the clearance of bearing were obtained using numerical integral method,and the effects of the bearing geometrical structural parameters of the bearing radial clearance,spiral angle,groove depth,groove width rate and number of groove,and rotate speed of vari-ous working conditions on bearing capacity were analyzed.The results show that the pressure of herringbone grooved bear-ing is distributed in hackle in circumference direction,and the herringbone pressure band is encircled on the neck of shaft,which makes the bearing to achieve bearing load in all directions,thereby improves its stableness and anti-vibra-tion.The load capacity of bearing can be improved all by increasing the eccentricity,reducing average clearance of gas film,increasing spiral angle,decreasing groove depth,increasing groove width rate and suitably increasing number of groove.The herringbone grooved structure can better achieve the dynamic effect of aerodynamic lubrication bearings,and improve stability and load capacity of the bearings.