大型汽轮机组轴承座动力吸振现象分析

doi:10.11930/j.issn.1004-9649.201703019

中国电力 ›› 2017, Vol. 50 ›› Issue (10): 116-119.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

吴亚军¹, 杨天海², 姜朝晖², 杨建刚¹, 曹仲勋¹

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

收稿日期:2017-03-27 出版日期:2017-10-25 发布日期:2017-10-30
作者简介:吴亚军（1993—）,男,安徽合肥人,硕士研究生,从事旋转机械故障诊断和治理研究。E-mail: yj_woo@163.com

Analysis on the Dynamic Vibration Absorption of Bearings of the Large Turbo Unit

WU Yajun¹, YANG Tianhai², JIANG Chaohui², YANG Jiangang¹, CAO Zhongxun¹

1. National Engineering Research Center of Turbo-generator Vibration, Southeast University, Nanjing 210096, China;
2. Shanghai Minghua Electric Power Technology Engineering Co., Ltd., Shanghai 200090, China

Received:2017-03-27 Online:2017-10-25 Published:2017-10-30

摘要/Abstract

摘要： 针对某大型汽轮机组轴承座异常振动现象,建立大型汽轮机组柔性支撑下转子-轴承-支撑系统动力学分析模型,从动力吸振新角度解释实际机组上发生的异常振动现象。研究结果表明,座缸式轴承支撑刚度较低,轴承座固有频率和转子系统固有频率有可能从设计时的大于50 Hz减小到50 Hz附近。一旦2个频率点重合,就容易发生动力吸振现象,转轴振动转移到轴承座振动上,导致轴振小而轴承座振动大。与此同时,系统固有频率点分解成2个频率点,分布在原固有频率两侧,出现双共振峰现象。

关键词: 汽轮机组, 动力吸振器, 轴承座振动, 轴振

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.

Key words: turbo unit, dynamic vibration absorber, bearing vibration, shaft vibration

中图分类号:

TK268.+1

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.

WU Yajun, YANG Tianhai, JIANG Chaohui, YANG Jiangang, CAO Zhongxun. Analysis on the Dynamic Vibration Absorption of Bearings of the Large Turbo Unit[J]. Electric Power, 2017, 50(10): 116-119.

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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

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Analysis on the Dynamic Vibration Absorption of Bearings of the Large Turbo Unit

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