• 机械仪表工程 •

### 界面损耗因子与法向阻尼的计算方法

1. (三峡大学 机械与动力学院， 湖北 宜昌 443002)
• 收稿日期:2014-08-04
• 基金资助:

国家自然科学基金(51275273)，三峡大学博士科研启动基金(KJ2012B013)项目资助

### Calculating Method of Surface Dissipation Factor and Normal Damping

TIAN Hongliang，ZHENG Jinhua，ZHAO Chunhua，ZHAO Xinze，FANG Zifan，ZHU Dalin

1. (College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, Hubei, China)
• Received:2014-08-04

Abstract:

Abstract： Calculating equations of surface normal contact stiffness, loss factor and normal contact damping were explored based on the Hertz normal contact mechanics expression and the fractal geometry theory analyzing surface normal contact stiffness, by improving the previous calculating model. The results reveal that the calculating method proposed can better predict the changing laws of normal contact stiffness, loss factor and normal contact damping. The normal contact stiffness increases by decreasing the fractal roughness and increasing the normal contact load, and it increases at first and then decreases with the increase of fractal dimension. Enhancing the fractal roughness and reducing the normal contact load both make the loss factor ascend which decreases first and then increases with the increase of fractal dimension. The loss factor converges to a certain definite value as the fractal dimension approaches 2. The normal contact damping lessens first and whereafter aggrandizes with the augment of fractal dimension, and there exist two inflexions in the variable process. When the fractal dimension is smaller than the first inflection value, the normal contact damping increases with the increase of fractal roughness. When the fractal dimension is in excess of the first inflection value, the normal contact damping decreases with the increase of fractal roughness. The normal contact damping decreases with the increase of normal contact load for D≤1.4. The normal contact damping increases with the increase of normal contact load for D>1.4.