非同期并列时机组轴系扭振的时频分析

doi:10.11930/j.issn.1004-9649.2014.1.86.4

中国电力 ›› 2014, Vol. 47 ›› Issue (1): 86-90.DOI: 10.11930/j.issn.1004-9649.2014.1.86.4

非同期并列时机组轴系扭振的时频分析

徐婧, 陈东超, 顾煜炯

华北电力大学能源动力与机械工程学院,北京 102206

收稿日期:2013-11-15 出版日期:2014-01-31 发布日期:2015-12-18
作者简介:徐婧（1989-）,女,山西大同人,硕士研究生,从事电力系统次同步振荡和轴系扭振的研究。E-mail: xujing0810@126.com
基金资助:
国家自然科学基金资助项目（51075145）

Time-Frequency Analysis of Shafting Torsional Vibration Caused by Asynchronous Juxtaposition

XU Jing, CHEN Dong-chao, GU Yu-jiong

School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Received:2013-11-15 Online:2014-01-31 Published:2015-12-18
Supported by:
This work is supported by National Natural Science Foundation of China (51075145)

摘要/Abstract

摘要： 三维有限元模型能较好地描述轴系的复杂结构,精确地反映倒角、凹槽等应力集中截面的扭应力情况。以某660 MW汽轮发电机组轴系为研究对象,介绍了应用ANSYS软件求解轴系扭振响应的过程,分析了机组非同期并列时的轴系扭振特性。分析表明：非同期并列时,各截面扭应力幅值迅速达到最大值,之后逐渐振荡衰减,故障对低发间转子危害较大;扭应力主要包括前两阶扭振固有频率和少量的工频成分,不同截面处各模态分量所占比例不同;120°和180° 2种非同期并列情况时的扭振响应特性基本相似,前者的扭应力响应大于后者。研究结果有助于提高机组安全管理水平。

关键词: 汽轮发电机组, 扭振, 有限元法, 非同期并列

Abstract: The three-dimensional finite element model can not only well describe the complex structure of the shafting system, but also accurately reflect the torsional stresses of the stress-concentrated cross sections such as the chamfer and the groove. In this paper, the shafting system of one 660-MW turbo-generator is studied, and the process of solving the torsional vibration response with ANSYS software is presented. The analysis on the response properties of the torsional vibration caused by asynchronous juxtaposition indicates that the torsional stress amplitude of each section reaches the maximum value rapidly, and then oscillates and weakens gradually. Faults are harmful to the rotor between the low-pressure cylinder and the generator. The torsional stress consists of the first two orders of natural frequencies of the torsional vibration and a small amount of power frequency components, and the proportion of the model component of different cross-sections differs from each other. Additionally, the responding characteristics of the torsional vibration are roughly similar both in 120° and 180° asynchronous juxtaposition, with the former one outweighing the latter one. The research results are helpful to improve the safety management of the unit.

Key words: turbo-generator unit, torsional vibration, finite element method, asynchronous juxtaposition

中图分类号:

TK263.6

徐婧, 陈东超, 顾煜炯. 非同期并列时机组轴系扭振的时频分析[J]. 中国电力, 2014, 47(1): 86-90.

XU Jing, CHEN Dong-chao, GU Yu-jiong. Time-Frequency Analysis of Shafting Torsional Vibration Caused by Asynchronous Juxtaposition[J]. Electric Power, 2014, 47(1): 86-90.

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非同期并列时机组轴系扭振的时频分析

Time-Frequency Analysis of Shafting Torsional Vibration Caused by Asynchronous Juxtaposition

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非同期并列时机组轴系扭振的时频分析

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