Theoretical and Experimental Investigations on EHL Point Contacts with Different Entrainment Velocity Directions
Theoretical and Experimental Investigations on EHL Point Contacts with Different Entrainment Velocity Directions
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DOI：
10.1080/10402004.2013.785624
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发表时间：
2013-03
影响因子：
2.1
通讯作者：
K. Stahl;K. Michaelis;J. Mayer;Alexander Weigl;T. Lohner;M. Omasta;M. Hartl;I. Křupka
中科院分区：
文献类型：
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作者：
K. Stahl;K. Michaelis;J. Mayer;Alexander Weigl;T. Lohner;M. Omasta;M. Hartl;I. Křupka
弹流润滑油膜厚度的预测对评价机械零件的性能和耐久性具有重要意义。然而，目前的公式可能不适合于真实的接触中发生的一般情况。研究了不同的润滑油卷吸速度角对油膜厚度分布的影响。为此，稳态等温弹流模型下使用的参数设置范围很广，包括变化的和速度，接触压力，和速度角。在中心膜厚度的趋势相对于低和高负载接触的润滑剂卷吸速度角的相当大的差异。通过光学球盘摩擦磨损试验机和双盘机使用电容法的实验测量的结果进行了比较。数值计算结果与实验测量结果吻合较好。
Film thickness prediction plays an important role in evaluating the performance and durability of machine elements under elastohydrodynamic lubrication (EHL). However, current formulae may not be appropriate for general conditions occurring in real contacts. This study investigates the effect of different lubricant entrainment velocity angles on film thickness distribution. For this purpose, a steady-state isothermal EHL model is used under a wide range of parameter sets including varying sum velocity, contact pressure, and sum velocity angle. Considerable differences in the trend of the central film thickness with respect to the lubricant entrainment velocity angle for low and high loaded contacts are shown. The results are compared with experimental measurements by means of an optical ball-on-disc tribometer and a twin-disc machine using capacitance method. Good agreement between numerical results and experimental measurements was found.