Wear fault diagnosis of an emulsion pump crank bearing

作     者：HAN Xiao-ming DU Chang-long ZHANG Yong-zhong TIE Zhan-xu 

作者机构：School of Mechanical and Power Engineering Henan Polytechnic University Jiaozuo Henan 454003 China School of Mechanical and Electronic Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China 

出 版 物：《Journal of China University of Mining and Technology》 (中国矿业大学学报（英文版）)

年 卷 期：2008年第18卷第3期

页      面：470-474页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 082002[工学-油气田开发工程] 

主　　题：emulsion pump crank beating wear diagnosis 

摘      要：The total load on a crank bearing was calculated by performing a load analysis of the crank connecting rod mechanism. The Reynolds equation for hydrodynamic lubrication of the crank bearing was established at the Reynolds boundary condition and was then solved using the Holland method. From this the regular track of the beating axis was obtained. As the crank beating gradually wears the eccentricity ratio corresponding to the minimum oil film thickness increases gradually. The oil-bound film eventually breaks down, which allows friction and collision between the metal surfaces of the crank pin and the bearing. The rigid impact leads to excitation of high frequency vibrations at the natural frequencies of the connecting rod. The experiments show that the wear condition of the crank beating can be identified correctly through the vibration signature at the natural frequencies of the connecting rod. The degree of wear can be predicted accurately through the energy content of the high frequency bands.