基于质量守恒边界条件的船舶艉轴承润滑性能分析

摘要

以船舶艉轴承为研究对象，基于质量守恒边界条件，编制相应的润滑仿真程序，研究艉轴承的润滑性能，探讨轴承润滑性能随轴承运行参数（如转速、轴承宽度、外载荷及空穴压力等）变化的规律。研究表明：质量守恒边界条件相比于雷诺边界条件，更加接近实际情况；空穴压力的增大并不总是有损轴承的承载力；随着空穴压力和轴承宽度的增大，偏心率和最大油膜压力都减小；随着外载荷的增加，油膜压力和空穴区域大小逐渐增大，呈现出很强的非线性趋势；随着转速的增大，油膜压力峰值减小；空穴区域随转速增大而增大，其位置会向最大轴承间隙处移动。%The lubricating properties of the ship stern bearing were studied by using the JFO boundary condition and programming the corresponding lubrication simulation program.The influences of operation parameters,such as speed,bear-ing width,external load and cavity pressure on the lubricating properties were analyzed.The research results show that, compared with the Reynolds boundary condition,the JFO boundary condition is closer to reality.Cavity pressure doesn’t always undermine the bearing carrying capacity.The increase of cavity pressure and bearing width all causes the decrease of eccentricity and maximum oil film pressure,the increase of external load leads to the augment of oil film pressure and cavity at a nonlinear trend,and the increase of speed causes the reduction of the maximum oil film pressure.The size of cavity expands with the increasing of speed and its position moves toward the maximum clearance of bearing.