基于动态子结构的主轴承热弹性流体润滑研究

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研究基于动态子结构缩聚的轴承热弹性流体动力学（TEHD）基本理论和求解方法；建立某V型8缸内燃机主轴承的TEHD仿真模型，分别计算得到各主轴承在最大载荷工况下的油膜压力、油膜厚度、摩擦功耗、轴心轨迹和油膜温度等润滑特性；针对润滑状况较差的第3主轴承，进行TEHD、EHD（弹性流体动力学）和HD（流体动力学）不同仿真求解方法的对比研究。研究结果表明，该内燃机的第3主轴承最小油膜厚度和最大油膜压力等润滑性能最差，需要进行相应的改进设计；TEHD求解中计及了润滑油和轴瓦热效应的影响,能获得更高的轴承润滑特性计算精度。 The basic theories and solutions of bearing themo-elastohydrodynamics （THD）based on the dynamic substruc- ture condensation theory were studied. The TEHD models of the main bearings of a V8 diesel engine were established. Lu- brication parameters of every main bearing, such as 0il film pressure, oil film thickness, friction power loss, orbital path and oil temperature in an engine working cycle were calculated under the maximum load condition. The comparison of different solutions such as TEHD, elastohydrodynamics （EHD）and hydrodynamics （HD）was completed on the 3rd main bearing which performed badly in lubrication. The results show that the 3rd main bearing has worst lubrication characteristics, such as minimum oil film thickness and maximum oil film pressure, and should be submitted to optimization design. Considering the thermal effects of oil film and shells, the TEHD results are more accurate than that of EHD and HD.