基于ANSYS轴承试验台转子轴承系统临界转速计算  

Critical Speed Calculation on Rotor-oil Film Bearing of Test Rig Based on ANSYS

作　　者：冯贺[1] 王建梅[1] 王生龙[1] 孟凡宁[1] 

机构地区：[1]太原科技大学冶金设备设计理论及技术山西省重点实验室,太原030024

出　　处：《太原科技大学学报》2017年第4期296-301,共6页Journal of Taiyuan University of Science and Technology

基　　金：山西省自然科学基金项目(2012011018-2);山西省研究生创新项目(2015SY64);太原科技大学2015年度大学生创新创业训练项目(xj2015004)

摘　　要：基于ANSYS动力学模块对轴系高速旋转机构进行了模态分析,得到了模态频率随自转速度变化的坎贝尔图,进而获得了临界转速,并分析了不同类型联轴器对转子-轴承系统的临界转速和各阶模态的影响。结果分析表明:处于刚性联轴器下的转子-轴承系统一阶临界转速高于弹性联轴器系统,影响幅度为6%;不同类型联轴器对转子-轴承系统的高阶特征频率影响较大;刚性联轴器对转子-轴承系统的各阶正反进动模态的影响是线性的,而弹性联轴器的影响是非线性的;弹性联轴器一定程度上降低了由于转子弯曲振动而造成油膜轴承损坏的可能性。Curves of frequencies are drawn based on mode analysis of high- speed rotating structures. Campbell diagram is given and the first critical speed is obtained. The effects of different types of coupling （ rigid coupling and flexible coupling） on critical speed and model of rotor-oil film bearing systems are analyzed. Results show lower-order critical speeds of rotor systems connected by rigid coupling is higher than that by flexible coupling. The magnitude of the impact is no more than 6 % . The different types of coupling have great impact on high-order frequencies of rotor-bearing system. The effect of rigid coupling on backward and forward whirl model of rotor-oil film bearing systems is liner, while the effect of flexible coupling is nonlinear. To a certain extent, the flexible couplings reduces the possibility of the damage caused by rotor bending vibration.

关 键 词：转子-轴承系统 联轴器 有限元 模态分析 坎贝尔图 临界转速 

分 类 号：TH133.4[机械工程—机械制造及自动化]