法向简谐振动对热弹流润滑的影响分析

Analysis of Thermal Elastohydrodynamic Lubrication Subjected to Normal Harmonic Vibration

两机械要素作相对高速运动时不可避免地会产生振动。分析了法向简谐振动对热弹流润滑问题的影响。揭示出法向简谐振动将造成油膜压力、膜厚和温度的剧烈变化。振动振幅变化对油膜的压力、膜厚、温度、载荷系数及摩擦系数都有较大的影响。振幅越大,油膜的变化越剧烈。油膜的中心压力、中心膜厚、最小膜厚、中心温度、载荷系数及摩擦系数的变化越大。中心压力、载荷系数和中心温度大致按正弦规律变化,只是在固体回到平衡位置向上作分离运动的过程中,中心压力、中心温度、载荷系数的变化偏离正弦规律。

When two mechanical elements undertake relatively high speed motion, vibration is inevitably produced. It investigates the influence of normal vibration on elastohydradynamic lubrication （EHL） contact. It is shown that the normal vibration causes drastic changes in oil film pressure, film thickness and temperature. Variation of the vibration amplitude exerts great influence on oil film characteristics. The greater the amplitude is, the greater the variation of the oil film characteristics and the change of central pressure, central film thickness, the minimum film thickness, central temperature and load coefficient are, but it influences the film thickness obviously. The center pressure, load coefficient and temperature change roughly according to the harmonic movemetn. Just the solid returns to equilibrium position as a separatist movement, the center pressure , temperature, the change of the load coefficient is deviated fiom the harmonic movement.