表面粗糙度特征对齿轮接触区润滑特性的影响
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- 英文论文题名：Influence of Surface Roughness on the Mixed Elastohydrodynamic Lubrication Performance of Gear Contact Area
- 论文作者：杨勇 ; 王家序 ; 周青华
- 英文论文作者：YANG Yong ; WANG Jiaxu ; ZHOU Qinghua ; School of Aeronautics and Astronautics ; Sichuan University
- 年：2016
- 作者机构：四川大学空天科学与工程学院;
- 论文关键词：齿轮 ; 混合弹流 ; 粗糙表面 ; 偏度 ; 峰度
- 英文论文关键词：gear ; elastohydrodynamic lubrication(EHL) ; roughness surface ; skewness ; kurtosis
- 会议召开时间：2016-11-25
- 会议录名称：2016年航空科学与技术全国博士生学术论坛摘要集
- 语种：中文
- 分类号：TH132.41
- 学会代码：XBHH
- 会议名称：2016年航空科学与技术全国博士生学术论坛
- 会议地点：中国陕西西安
- 主办单位：西北工业大学研究生院、中国高校航空学院院长联席会
- 学会名称：西北工业大学航空学院
- 页数：1
- 文件大小：473k
- 原文格式：D
- 会议级别：全国
摘要
大部分工程实际粗糙表面符合非高斯分布,并对齿轮接触副润滑特性有重要影响。将渐开线齿轮啮合过程中齿面接触等效成三维无限长线接触,建立了一个可分析直齿轮和斜齿轮的三维混合弹流润滑计算模型;采用基于快速傅里叶变换的数值仿真方法生成给定参数的非高斯粗糙表面;运用该模型对直齿轮和斜齿轮啮合过程进行分析,求得不同表面粗糙度特征齿轮在各个啮合点的油膜厚度、接触区载荷以及接触区比例的情况。结果表明:对于标准差相等的非高斯粗糙表面,偏度值对齿轮润滑状况的影响与工况紧密相关,在润滑良好的条件下,偏度值越小润滑状况越优;润滑恶劣的条件下,偏度值越大润滑状况越优;而在各种工况下,峰度值对齿轮润滑状况的影响都表现出峰度值越大润滑状况越优的特点。
Most practical engineering rough surfaces approximately follow non-Gaussian distributions. Surface roughness characteristics play an important role in gear lubrication performance. A three-dimensional elastohydrodynamic lubrication(EHL) model for involute gears is developed by simplifying the contact between meshing tooth surfaces of spur or helical gears as an infinite line-contact model. By using the proposed model and non-Gaussian random roughness surfaces generated by numerical method with given parameters based on FFT, the meshing process of spur and helical gears is analyzed. The film thickness, contact area ratio and contact load ratio of contacting points are obtained as well. The results show that a small skewness would improve the lubrication state under good lubrication conditions; instead, while for a bad lubrication condition, the lubrication status may get even worse when the skewness decreases. However, a greater kurtosis always bring a better lubrication state.
Most practical engineering rough surfaces approximately follow non-Gaussian distributions. Surface roughness characteristics play an important role in gear lubrication performance. A three-dimensional elastohydrodynamic lubrication(EHL) model for involute gears is developed by simplifying the contact between meshing tooth surfaces of spur or helical gears as an infinite line-contact model. By using the proposed model and non-Gaussian random roughness surfaces generated by numerical method with given parameters based on FFT, the meshing process of spur and helical gears is analyzed. The film thickness, contact area ratio and contact load ratio of contacting points are obtained as well. The results show that a small skewness would improve the lubrication state under good lubrication conditions; instead, while for a bad lubrication condition, the lubrication status may get even worse when the skewness decreases. However, a greater kurtosis always bring a better lubrication state.
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