基于有限差分法的径向滑动轴承油膜压力分布计算

摘要

Journal bearings are widely used in rotating machinery,its static and dynamic parameters make significant im pact on the operation of rotating machinery. Determining the parameters depends on the oil film pressure distribution of bearing,and Reynolds equation is the foundation to calculate the oil film pressure distribution. For the calculation of specif ic bearing parameters, the traditional computing method is to backstep the eccentricity ratio and attitude angle of specific bearing using the curves that were fitted with the known static and dynamic parameters for the journal bearing with given eccentricity and width-radius ratio, and then calculating the oil film pressure distribution. This inverse method is extremely inconvenient. Two-dimensional Reynolds equation was solved with the given load and width-radius ratio of actual bearing based on finite difference method and programming with MATLAB software, the actual bearing parameters was calculated with the improved method and good results were achieved. This method makes it easier to calculate the round-pad bearing parameters.%滑动轴承广泛应用于旋转机械中,其静动态参数对旋转机械的运转有很大影响.确定滑动轴承的静动态参数依赖于轴承的油膜压力分布,Reynolds方程是油膜压力计算的基础.对于具体轴承参数计算,传统方法是利用已知的给定偏心率和宽径比下的轴承静动态参数进行曲线拟合,通过反推实际轴承的偏心率和偏位角,然后进行压力分布计算.这种逆运算不太方便.基于有限差分法,采用MATLAB软件编程计算,利用实际轴承已知外力和宽径比直接求解完整二维流动Reynolds方程得到油膜压力分布曲线,进一步利用改进方法设计计算实际轴承参数,取得较好的计算精度,使圆瓦轴承参数计算更为简便.