中国电力2017，Vol.50Issue(10)：116-119,4.DOI:10.11930/j.issn.1004-9649.201703019
大型汽轮机组轴承座动力吸振现象分析
Analysis on the Dynamic Vibration Absorption of Bearings of the Large Turbo Unit
吴亚军 1杨天海 2姜朝晖 2杨建刚 1曹仲勋1
作者信息
- 1. 东南大学火电机组振动国家工程研究中心,江苏南京210096
- 2. 上海明华电力技术工程有限公司,上海20090
- 折叠
摘要
Abstract
Aiming at the abnormal structural vibration occurred on the bearings of large turbo units,the dynamic model of the rotor-bearing-support system with flexible support is set up to analyze the abnormal structural vibration phenomenon using the dynamic vibration absorber theory.The result shows that the support stiffness of the bearings located on the exhaust cylinder is low.The natural frequencies of the bearings and the rotor system may be reduced from more than 50 Hz as being designed to less than 50 Hz.Once the natural frequencies of the bearings and the rotor system are superposed,the vibration absorbing phenomenon tends to occur.The shaft vibration transfers to the bearings,resulting in small shaft vibration and large bearing vibration.At this time,the system natural frequency is decomposed into two,which are distributed on both sides of the natural frequency.Consequently,a double resonance peak appears.关键词
汽轮机组/动力吸振器/轴承座振动/轴振Key words
turbo unit/dynamic vibration absorber/bearing vibration/shaft vibration分类
能源科技引用本文复制引用
吴亚军,杨天海,姜朝晖,杨建刚,曹仲勋..大型汽轮机组轴承座动力吸振现象分析[J].中国电力,2017,50(10):116-119,4.
