静压支承摩擦副温度场模拟与实验

Numerical and Experimental Study on Temperature Field of Hydrostatic Bearing Friction Pairs

关键词:  温度场  静压支承摩擦副  静压推力轴承  流固耦合  实验研究

Key words:  Temperature field  Hydrostatic bearing friction pairs  Hydrostatic thrust bearing  Fluid-solid interaction  Experimental research

摘要:

为了研究静压支承摩擦副温度场，基于摩擦学和传热学理论，采用流固耦合方法对圆形腔静压支承摩擦副的温度分布规律及其速度特性进行研究，并进行实验验证。结果表明:间隙油膜在挤压和剪切以及泵功耗联合作用下产生的热，通过流固耦合方式传递给静压导轨和油垫，进而扩散到整个旋转工作台和底座。间隙油膜接触处摩擦副温度最高，向四周扩散温度逐渐降低。随着旋转工作台转速增加，油膜温度上升，工作台上表面和侧面温度下降，并趋于平缓，底座侧面温度从下到上先升高后降低。旋转速度由10 r/min增加至80 r/min时旋转工作台最高温升为6.8℃，底座最高温升为3.5℃，因而旋转速度对支承摩擦副温度场影响不能忽略。并将实验结果与模拟值进行比较，温度相对误差均在4%以下，满足工程实践要求。

Abstract:

In order to study temperature field of hydrostatic bearing friction pairs，temperature distribution and its speed characteristics of hydrostatic bearing friction pairs with circular recess are analyzed by adopting the method of fluid-structure interaction based on tribology theory and heat transfer，and a verification experiment is carried on. Due to the joint action of oil film extrusion，oil shear and pump power consumption，and a large amount of heat is generated in the oil film clearance during the operation of hydrostatic thrust bearing，and heat is passed to the hydrostatic slideway and pad by way of fluid-solid interaction，and then heat spreads to the entire rotational workbench and base. The temperature of friction pairs is the highest in the place that is contacting with oil film clearance，and temperature decreases gradually to all around. The results have been found that by increasing the rotational speed oil film temperature increased，and temperature of upper surface and side surface is decreased，and then tends to be steady，and temperature of side surface of base increased and then decreased from bottom to upper. The highest temperature rise of the rotational workbench was 6.8℃ when the rotational speed was from 10 r/min to 80 r/min，but the highest temperature rise of the base was 3.5℃，and therefore the effects of rotational speed on temperature field of hydrostatic bearing friction pairs cannot be ignored in the thermal calculation of hydrostatic bearing friction pairs. Comparison between experimental data with simulation values shows that the maximum error of temperature is less than 4%，meeting the actual requirements.