On-line torsional vibration fatigue analysis method for turbine-generator shafts during sub-synchronous oscillation

JIN Tiezheng; GU Yujiong

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On-line torsional vibration fatigue analysis method for turbine-generator shafts during sub-synchronous oscillation

更新时间：2025-09-28

- On-line torsional vibration fatigue analysis method for turbine-generator shafts during sub-synchronous oscillation
- Thermal Power Generation Vol. 45, Issue 6, Pages: 100-105(2016)
- 作者机构：
  
  1. 华北电力大学能源动力与机械工程学院
  2. 神华国华电力研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM311
- Published：2016
- 稿件说明：
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JIN Tiezheng, GU Yujiong. On-line torsional vibration fatigue analysis method for turbine-generator shafts during sub-synchronous oscillation[J]. Thermal power generation, 2016, 45(6): 100-105.
DOI：

JIN Tiezheng, GU Yujiong. On-line torsional vibration fatigue analysis method for turbine-generator shafts during sub-synchronous oscillation[J]. Thermal power generation, 2016, 45(6): 100-105. DOI：

摘要

为实时分析次同步振荡状态下轴系的扭振疲劳寿命损耗

准确评估轴系的安全性

本文分析了轴系扭振应力与机端扭角之间的关系

针对模态扭角提取过程中相位偏差、边界效应等问题

提出了一种利用零相位带通滤波-"移动窗"-模态叠加的方法计算扭振危险截面的应力历程

进而对轴系的扭振疲劳寿命损耗进行分析。结果表明:该方法在保证分析精度的同时

也可保证分析的实时性

适用于汽轮发电机组轴系扭振的在线监测、分析和系统保护。

Abstract

In order to analyze the torsional fatigue life loss of the shaft system in real-time during sub-synchronous oscillation and accurately assess the safety of the shaft system

the relationship between the torsional vibration stress and the torsional angle of the shaft was investigated.Moreover

against the phase deviation

boundary effect and other problems occurred during the torsional angle extraction

a new analysis method was put forward

which uses zero-phase band-pass filter- " moving window"-modal superposition method to calculate the stress history of torsional vibration in dangerous section

and then analyzes the shafting torsional fatigue life loss.The results show that

this method can ensure both the analysis accuracy and the real-time tendency

it can be applied in online monitoring

investigation and system protection of the torsional vibration of shafting system in the steam turbines.

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