基于非等温条件的空气静压轴承润滑问题研究

改进了传统空气静压轴承的润滑模型,建立了考虑温度影响的空气静压轴承润滑模型,并给出一种该模型的数值解算方法,即利用FEMLAB的多物理场功能,将气体的状态方程作为耦合的桥梁,求解参数形式的雷诺方程和能量方程;将质量流量守恒条件作为判断收敛的条件,利用MATLAB迭代,从而完成最终的求解计算。通过实验研究验证了模型和解算方法的正确性,结果表明:气体通过节流孔后温度降低,在精密和超精密的应用场合将会引起结构非常显著的变形;并且供气压力越大,和(或)节流孔的直径越大,温度降效应越明显。

Research on the Condition of Nonisothermal-based Lubrication Problem of the Externally Pressurized Gas Bearings

The traditional lubrication model was improved,a theoretical lubrication model of externally pressurized gas bearing was developed,which considers the impacts of the temperature on the characteristic.A kind of numerical solution to the established theoretical lubrication model was presented,which uses the multi physics function of FEMLAB,uses the gas state equation as the bridge to solve the Reynolds equation and the energy equation,and uses the flow equation as the condition to convergence in the MATLAB iteration solution.The results of the experiments validate the model and its solution.Result shows that the gas temperature is indeed lowered through restrictor,and in ultra-precision applications the cooling effect can and does cause dimensional changes;and the cooling effect increases by increasing the supply pressure and/or the diameter of restrictor.