文献类型：期刊文献

英文题名：Bearing load distribution and fatigue life analysis for a tilted overhung agitator

作者：Gao, Lei[1];Guo, Changle[1];An, Qi[1]

机构：[1]East China Univ Sci & Technol, Room 321,Bldg 17,130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2026

外文期刊名：PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE

收录：;EI(收录号：20262620990348);WOS:【SCI-EXPANDED(收录号:WOS:001801615000001)】；

基金：The authors received no financial support for the research, authorship, and/or publication of this article.

语种：英文

外文关键词：tilted overhung agitator rotor; bearing load distribution; bearing fatigue life; nonlinear bearing model; Hertzian contact

摘要：Agitators with tilted overhung rotors are widely used in the pharmaceutical and bioengineering industries; however, the accurate evaluation of bearing loads and fatigue life for such systems remains a challenging problem in engineering practice. In this study, a tilted agitator rotor was investigated. Based on a detailed mechanical analysis, the coupled effects of rotor tilt on the gravitational load distribution and operating loads were considered. Bearing elastic deformation is incorporated by introducing Hertzian contact theory and a nonlinear bearing load model, leading to a set of equilibrium and differential deflection equations. The displacements and angular misalignments of the bearing inner rings were solved using the Newton-Raphson method, which enabled the determination of the actual contact loads acting on individual rolling elements. On this basis, a bearing system life prediction method suitable for tilted agitator rotors was developed by combining ISO 281:2007 with the Ioannides-Harris (IH) life theory and rolling element-raceway contact fatigue theory. A HCQ50 agitator is selected as a representative case for the numerical investigation. The results indicate that, compared with the lower bearing B, the upper bearing A carries the majority of the axial load and therefore exhibits a shorter fatigue life. Bearing preload has the most significant influence on bearing life, whereas the effect of bearing span is relatively minor. An optimal bearing life is achieved at a preload of approximately 230 N. The bearing life reaches a maximum when the agitator shaft inclination angle is approximately 10 degrees. In addition, reducing the overhung length and agitator rotational speed are also beneficial for extending bearing life.