Stability analysis of long hydrodynamic journal bearings based on the journal center trajectory

作     者：Yu HUANG Haiyin CAO Zhuxin TIAN 

作者机构：State Key Lab of Digital Manufacturing Equipment and TechnologySchool of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical EngineeringHubei University of Arts and ScienceXiangyang 441053China 

出 版 物：《Friction》 (摩擦（英文版）)

年 卷 期：2021年第9卷第6期

页      面：1776-1783页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：This research is supported by doctoral research fund of Hubei University of Arts and Science(No.2059023) the Project of Hubei University of Arts and Science(No.XK2020005) National Science and Technology Major Project(No.2019ZX04001024) Central Government Guides Local Science and Technology Development Projects of Hubei Province(No.2018ZYYD016) start-up program for excellent young and middle-aged scientific and technological innovation team of Hubei Provincial Department of Education(No.T201919) 

主　　题：long journal bearings stability threshold speed stability boundary journal center trajectory 

摘      要：In this study,we observe that there are two threshold speeds(stability threshold speed and second threshold speed)for the long journal bearing,which is different for the short *** the rotating speed is below the stability threshold speed,the stability boundary nearly coincides with the clearance circle,and the journal center gradually returns to the equilibrium point after being released at an initial *** the rotating speed is between the stability threshold speed and the second threshold speed,after being released at an initial point,the journal center converges to a contour containing the equilibrium *** this situation,for a higher rotating speed,the corresponding contour is also *** the rotating speed exceeds the second threshold speed,the journal gradually moves towards the bearing surface after being released at an initial point.