基于SDT理论滑动轴承转子系统运行特性的研究

Research on the Operation Characteristics of Sliding Bearing Rotor System Based on SDT Theory

为了研究轴颈表面误差对滑动轴承转子系统特性的影响,以及基于SDT理论所建立的SDT误差模型的可行性,引入SDT理论对轴颈表面的随机误差进行表征,进一步推导出一种新的油膜厚度计算广义方程,在此基础上求解了雷诺方程。在SDT误差模型基础下,研究圆度误差对滑动轴承的摩擦功率损耗、临界转速、承载能力以及稳定性的影响。研究结果表明:随着旋量参数的增大,摩擦功率损耗在x方向减小,y方向增大,且随着偏心率的增大摩擦功率损耗减小,特别是偏心率小于0.5时影响最为明显,说明改变不同方向的旋量参数大小,圆度误差对摩擦功率损耗的影响不同;同时随着旋量参数增大,系统临界转速增大,特别是在偏心率大于0.6时增大现象更加明显;而且对系统的稳定性具有促进作用,在偏心率大于0.5时促进作用更加明显。研究结果不仅证明了SDT误差模型的可行性,而且为轴承设计时公差选择提供参考。

In order to study the influence of journal surface errors on the system characteristics of sliding bearing rotor and the feasibility of the SDT error model based on SDT theory,the SDT theory was introduced to characterize the random errors on journal surface.A new generalized equation for calculating oil film thickness was further derived.On the basis of the equation,the Reynolds equation was solved.Based on the SDT error model,the influence of roundness error on the frictional power loss,critical speed,bearing capacity and stability of sliding bearings was studied.The results show that with the increase of the spinor parameters,the friction power loss decreases in x direction and increases in y direction.The friction power loss decreases with the increase of the eccentricity,especially when the eccentricity ratio is less than 0.5.The above shows that changing the spinor parameters size in different direction,the influences of the roundness error on the friction power loss are different.At the same time,with the increase of the spinor parameter,the critical speed of the system increases,especially when the eccentricity is greater than 0.6.Moreover,it has a promoting effect on the stability of the system,and the promoting effect is more obvious when the eccentricity is greater than 0.5.Therefore,it not only proves the feasibility of the SDT error model,but also provides reference for tolerance selection in bearing design.