高速陶瓷滚动轴承等效刚度分析与试验

高速旋转机械,尤其是微小型发动机广泛采用陶瓷滚动轴承。轴承支承刚度对高速转子——支承系统的动力特性有重要的影响。滑动轴承已有比较系统的动力特性数据库可供参考使用;滚动轴承一般按经验公式估算其刚度特性或简化为定常的弹性元件,但误差较大。本文分析了影响滚动轴承等效刚度的主要因素,提出了滚动轴承等效刚度的计算方法,并设计了试验装置,对陶瓷轴承的等效刚度进行测试。理论分析和试验取得了比较一致的结果。

Theoretical Analysis and Experiment of the High Speed Ceramic Rolling Bearing Equivalent Stiffness

Ceramic bearings are widely used in the high speed machine,especially in the micro or small turbine engines.The bearing stiffness has a considerable influence on the dynamic characteristics of a rotor-bearing system.There were some databases of slide bearing dynamic characteristics.Rolling bearing stiffness is usually estimated empirically and it is simplified as a constant stiffness element.This method often causes large error.The primary factors that influence the rolling bearing equivalent stiffness were analyzed and a method for the calculation of rolling bearing equivalent stiffness was proposed.A test rig was designed for measuring the equivalent stiffness of ceramic bearings.The theoretical and experimental results agree well.