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为对主轴承结构参数和润滑油参数进行优化匹配,根据动载滑动轴承弹性流体动力润滑模型,结合AVL Excite软件对CA4D32柴油机主轴承进行多体动力学与弹性流体动力学耦合仿真.精确选取标定工况下影响各主轴承润滑性能的轴承宽度、供油压力、供油温度、润滑油类型、径向间隙、轴瓦油槽方向、轴颈油孔位置等关键因素,以最小油膜厚度为优化目标,基于正交设计法,确定各主轴承润滑性能最优参数组合,并对该参数组合进行仿真验证.结果表明:各主轴承最小油膜厚度增大9.1%～32.1%,一个循环内最小油膜厚度明显增大且其波动趋于平缓;各主轴承总摩擦功率损失显著降低.
In order to optimize the structural parameters of the main bearing and the lubricating oil parameters, according to the dynamic hydrodynamic lubrication model of the dynamic bearing and the software of AVL Excite, the multi-body dynamic and elastohydrodynamic coupling simulation of the main bearing of the CA4D32 diesel engine is performed. Under the condition of the main bearing lubrication performance of bearing width, oil supply pressure, oil temperature, lubricant type, radial clearance, bearing groove direction, journal hole location and other key factors in order to optimize the minimum oil film thickness, Based on the orthogonal design method, the optimal combination of lubrication parameters of the main bearing was determined, and the parameter combination was verified by simulation.The results showed that the minimum oil film thickness of each main bearing increased 9.1% ~ 32.1%, and the minimum oil film thickness in one cycle was obviously Increase and its fluctuations tend to be gentle; the total friction loss of the main bearing power loss decreased significantly.