圆柱度误差下长径比对滑动轴承运行特性的影响

Effect of Length-to-Diameter Ratio on Operating Characteristics of Sliding Bearings Under Cylindricity Error

圆柱度误差作为制造误差的重要组成部分,它对滑动轴承转子系统的影响很大,但目前对圆柱度误差的研究较少且没有研究圆柱度误差对不同长径比下滑动轴承运行特性的影响。本文建立圆柱度误差下滑动轴承系统动力学模型,通过有限差分法求解Reynolds方程,利用MATLAB仿真分析得出不同长径比下Sommerfeld数、无量纲运行参数Op、功率损耗曲线的变化情况,对比不同长径比对普通滑动轴承运行特性的影响。结果表明圆柱度误差存在与否不改变长径比对轴承承载能力的影响,即无论是否存在圆柱度误差长径比的增加都有利于承载力的提高;圆柱度误差会改变长径比对滑动轴承运行稳定性的影响;圆柱度误差会改变长径比对滑动轴承摩擦功率损耗的影响。

As an important part of manufacture cylindricity error has a great influence on the sliding bearing rotor system(rotorjournal bearing system).However,only few researches on cylindricity errorhave been done.Furthermore,there is no research on how cylindricity error influences on the operating characteristics of sliding bearing under different ratios of length.In this paper,the dynamic model of sliding bearing system under cylindricity error is established.The Reynolds equation is solved by finite difference method.The MATLAB simulation analysis is used to obtain the Sommerfeld number,dimensionless operating parameter Opand power loss curve under different ratios of length so as to compare how different length-diameter ratios effect the operating characteristics of general sliding bearings.The results show that whether the cylindricity error exists or not does not change the influence of the ratios of length on the bearing capacity of the bearing,namely,whether ratios of length of the cylindricity error increases or not is beneficial to the increase of the bearing capacity;the cylindricity error will change the influence of ratios of length on operational stability of sliding bearings;the cylindricity error will change the influence of the ratios of length on the frictional power loss of the sliding bearing.