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RESEARCH ON DYNAMIC CHARACTERSITICS OF LINE CONTACT FRICTION PAIRS UNDER THERMAL EHL STATE
The line contact elasto-hydrodynamic lubrication (EHL) phenomenon generally exists in key parts of mechanical systems e. g. bearings, gears, the lubricant oil film between the contact interfaces acts as a spring and damper, and the frictional heat generated by the contact between the lubricant and the solids changes the rheological properties of the lubricant, then the dynamics characteristics of the contact pair are affected. Based on the basic principles of elastohydrodynamic lubrication heat transfer and dynamics, the coupling model of line contact thermoelastohydrodynamic lubrication and dynamics was established. By using the relationship between the stiffness and the contact body approach amount under steady state conditions, the part affected by the stiffness force under transient contact was separated and the damping parameter was obtained. Based on the above model, the contact oil film characteristics and the dynamics characteristics of thermal elastohydrodynamic lubrication were studied. The results show that the lubricating oil film temperature obviously increased with the increasing applied load and entrainment velocity, which influences the rheological properties of lubricant and further affects the dynamics characteristics during the loading process. At light load and low speed, the influence of thermal effect on elastohydrodynamic lubrication stiffness and damping is not obvious. With the increase of load and entrainment speed, the thermal effect of elastohydrodynamic stiffness and damping is greater than the calculated results under isothermal conditions, and the influence of thermal effect is more obvious with the increase of speed.
RESEARCH ON DYNAMIC CHARACTERSITICS OF LINE CONTACT FRICTION PAIRS UNDER THERMAL EHL STATE
The line contact elasto-hydrodynamic lubrication (EHL) phenomenon generally exists in key parts of mechanical systems e. g. bearings, gears, the lubricant oil film between the contact interfaces acts as a spring and damper, and the frictional heat generated by the contact between the lubricant and the solids changes the rheological properties of the lubricant, then the dynamics characteristics of the contact pair are affected. Based on the basic principles of elastohydrodynamic lubrication heat transfer and dynamics, the coupling model of line contact thermoelastohydrodynamic lubrication and dynamics was established. By using the relationship between the stiffness and the contact body approach amount under steady state conditions, the part affected by the stiffness force under transient contact was separated and the damping parameter was obtained. Based on the above model, the contact oil film characteristics and the dynamics characteristics of thermal elastohydrodynamic lubrication were studied. The results show that the lubricating oil film temperature obviously increased with the increasing applied load and entrainment velocity, which influences the rheological properties of lubricant and further affects the dynamics characteristics during the loading process. At light load and low speed, the influence of thermal effect on elastohydrodynamic lubrication stiffness and damping is not obvious. With the increase of load and entrainment speed, the thermal effect of elastohydrodynamic stiffness and damping is greater than the calculated results under isothermal conditions, and the influence of thermal effect is more obvious with the increase of speed.
RESEARCH ON DYNAMIC CHARACTERSITICS OF LINE CONTACT FRICTION PAIRS UNDER THERMAL EHL STATE
ZHU AnYuan (author) / FANG CongCong (author) / ZHOU Wei (author) / PENG YongDong (author)
2023
Article (Journal)
Electronic Resource
Unknown
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