基于遗传算法的轴向柱塞泵配流盘密封环结构多目标优化  

Multi-objective Optimization of Cylinder/Valve-plate Sealing Ring in Axial Piston Pump Based on Genetic Algorithm

作　　者：叶绍干 葛纪刚 侯亮[1] 穆瑞[1] 卜祥建 YE Shaogan;GE Jigang;HOU Liang;MU Rui;BU Xiangjian(Department of Mechanical and Electrical Engineering,Xiamen University,Xiamen 361021,China)

机构地区：[1]厦门大学机电工程系,厦门361021

出　　处：《农业机械学报》2022年第1期441-450,共10页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家重点研发计划项目(2019YFB2005101、2018YFB2001101);厦门市重大科技项目(3502Z20191019);流体动力与机械系统国家重点实验室开放基金项目(GZKF-201903、GZKF-202013)。

摘　　要：为改善微小型轴向柱塞泵配流副润滑特性,对缸体进行受力分析,建立了配流副油膜润滑模型,以泄漏量、缸体倾覆角、粘性摩擦力矩为优化目标,采用多目标遗传算法(Non-dominated sorting genetic algorithm,NSGA-Ⅱ)对配流盘密封环结构参数进行了优化,包括配流盘密封环径向尺寸R_(1)、R_(2)、R_(3)、R_(4)和腰型槽起点张角θ。模型考虑缸体微观的倾斜运动以及宏观的旋转运动,对楔形油膜的动态变化过程进行了仿真。通过有限容积法对雷诺方程进行离散化处理,得到配流盘表面油膜的压力分布情况,并分析了密封环结构对油膜特性的影响。研究结果表明,密封环最外缘的尺寸对油膜润滑性能影响较小,腰型槽起点张角和密封环内缘尺寸对缸体倾覆角的影响较大;配流盘结构优化后,油膜综合润滑特性提升5.4%,倾覆角和泄漏量分别下降3.8%和29.6%。In order to improve the lubrication performance of the cylinder/valve-plate interface of a small axial piston pump,an oil film lubrication model was established based on the force analysis of the cylinder block.With leakage,cylinder overturning angle and viscous friction torque as the optimization objectives,the structural parameters of the valve-plate seal ring were optimized by multi-objective non-dominated sorting genetic algorithm(NSGA-Ⅱ),including the radial dimensions of valve-plate sealring R_(1),R_(2),R_(3),R_(4) and the starting angleθof the waist groove.Considering the micro tilt motion and macro rotation motion of the cylinder block,the dynamic change process of the wedge oil film was simulated.The pressure distribution of the oil film on the cylinder/valve-plate interface was obtained by discretizing the Reynolds equation by the finite volume method.The results showed that the size of the outermost edge of the seal ring had little influence on the lubrication performance of the oil film,while the starting angle of the waist groove and the size of the inner edge of the seal ring had large influence on the overturning angle of the cylinder.After the optimization of the structure of valve plate,the comprehensive lubrication performance of the oil film was improved by 5.4%,and the overturning angle and leakage rate were decreased by 3.8%and 29.6%,respectively.

关 键 词：轴向柱塞泵 配流盘密封环 多目标优化算法 润滑模型 

分 类 号：TH137.5[机械工程—机械制造及自动化]