为准确预测和优化船舶柴油机主轴承润滑摩擦特性，就需要考虑原来被忽略的整机体、温度等重要因素.本文在柔性整机体下，运用质量守恒边界条件下的扩展Reynolds方程和Greenwood/Tripp微峰接触理论，计入温度对摩擦润滑的影响，建立船舶柴油机机体和曲轴耦合下主轴承的热弹流体动力润滑模型.计算表明：在热弹流体动力混合润滑模型下，单轴承座模型的计算结果偏于保守，整机体模型较为合理；在全柔性整机体模型下，EHD+模型较TEHD模型的摩擦功耗偏大，说明温度对油膜的影响对主轴承的摩擦特性有重要作用；另外，无论何种计算模型，整周期内多数时间段为混合润滑，但液动摩擦占主导地λ. 总之，全柔性、计入表面接触和温度影响的热弹流体动力混合润滑模型对大型船舶柴油机而言，是较适宜的选择.

To predict and optimize lubrication-friction characteristics of the main bearings of marine diesel engine, it is necessary to consider the whole body, temperature and other important factors, which have been neglected. Under the condition of flexible whole engine body, by using the extended Reynolds equation under the boundary condition of mass conservation and the Greenwood/Tripp micro-peak contact theory, the thermal-elasto-hydrodynamic lubrication model of the main bearing under the coupling of the marine diesel engine block and the crankshaft was established by taking into account the influence of temperature on friction lubrication. The results show that on condition of the thermal-elasto-hydrodynamic hybrid lubrication model, the calculation results of the single bearing model are conservative, and the whole body model is more reasonable; while on condition of the whole flexible engine body model, the friction power consumption of EHD+ model is higher than that of TEHD model, which indicates that the influence of temperature on oil film plays an important role in the friction characteristics of the main bearing. In addition, no matter what kind of calculation model, most of the time in the whole cycle is mixed lubrication, but the hydrodynamic friction is dominant. In short, a fully flexible, thermo elastic hydrodynamic hybrid lubrication model considering surface contact and temperature effects is a suitable choice for large marine diesel engines.