液体动静压轴承油膜的压力场和温度场分析

Analysis of oil film pressure field and temperature field of hydrodynamic and hydrostatic bearing

针对深浅腔液体动静压轴承的承载特性等问题,对液体动静压轴承的油膜压力场和温度场进行了仿真分析。以超高速磨削电主轴系统中常用的深浅腔液体动静压轴承为研究对象,建立了液体动静压轴承油膜的三维有限元模型,对油膜进行了网格划分,并对划分后的网格进行了质量评定;采用动网格技术实现了对油膜偏心率的变更,在不同主轴转速、偏心率的工作条件下,计算了深浅腔动静压轴承油膜压力和温度的分布情况,分析了其油膜压力分布和温度分布的变化规律;研究了转速、偏心率对动静压轴承的承载力和油膜温升的影响规律。研究结果表明:在深浅腔液体动静压轴承运转过程中,随着转速和偏心率的提高,油膜承载力和温升也随之提高,且转速对油膜温升的影响要比偏心率大。

Aiming at the problem of bearing characteristics of deep and shallow hydrostatic bearings the oil film pressure field and tempera ture field of hydrostatic bearings were simulated and analyzed.Taking the hydraulic and hydrostatic bearings commonly used in the ultra high speed grinding motorized spindle system as the research object the three dimensional finite element model of the oil film of the hydrodynamic and hydrostatic bearings was established and meshed and then the mesh quality was evaluated.The oil film pressure and temperature distri bution of deep and shallow cavity hydrodynamic and hydrostatic bearings under different rotational speed and eccentricity were calculated by using dynamic mesh technology which can be used to change the eccentricity of the oil film.Distribution of oil film pressure and temperature in shallow chamber hydrodynamic and hydrostatic bearings was analyzed.The influence of rotational speed and eccentricity on bearing capaci ty and the oil film temperature rise of hydrodynamic bearing was studied.The results indicate that in the operation of deep and shallow cham ber hydrodynamic and hydrostatic bearings with the increase of rotational speed and eccentricity the bearing capacity and temperature rise of the oil film also increase and the influence of rotational speed on the temperature rise of the oil film is greater than that of eccentricity.