Dynamic Response and Feature Extraction of Cracked Rotor in Ultra-supercritical Steam Turbine

CAO Lihua; YU Mingxin; LI Dacai; SI Heyong

doi:10.13334/j.0258-8013.pcsee.241101

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Dynamic Response and Feature Extraction of Cracked Rotor in Ultra-supercritical Steam Turbine

更新时间：2026-01-20

- Dynamic Response and Feature Extraction of Cracked Rotor in Ultra-supercritical Steam Turbine
- Vol. 45, Issue 19, Pages: 7600-7610(2025)
- 作者机构：
  
  东北电力大学能源与动力工程学院,吉林市,吉林省,132012
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.241101
  CLC：
- Published：2025
- 稿件说明：
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CAO Lihua, YU Mingxin, LI Dacai, et al. Dynamic Response and Feature Extraction of Cracked Rotor in Ultra-supercritical Steam Turbine[J]. 2025, 45(19): 7600-7610.
DOI：

CAO Lihua, YU Mingxin, LI Dacai, et al. Dynamic Response and Feature Extraction of Cracked Rotor in Ultra-supercritical Steam Turbine[J]. 2025, 45(19): 7600-7610. DOI： 10.13334/j.0258-8013.pcsee.241101.

摘要

裂纹故障作为诱发大型汽轮机组轴系振动的常见故障之一，严重威胁着电力生产的安全。尤其是高参数汽轮机转子密封气动作用显著，加剧轴系振动。为此，该文在研究裂纹轴系振动响应的同时，考虑汽流激振和其他非线性因素对轴系的影响，基于频率切片小波变换(frequency slice wavelettransform，FSWT)法在指定区间内细化响应中的特征频率分析动力响应。结果表明：耦合汽流激振后，裂纹轴系的时域曲线中各倍频间的能量转换和叠加现象加剧，机组升负荷时系统由类似“单周期”混沌运动逐渐变为“二周期”混沌运动，1倍频跨度逐渐降低7.64%、11.66%、22.69%，4倍频呈现较小的“波浪式”变化。

Abstract

As one of the common faults that induce shafting vibration of large steam turbine units

crack fault seriously threatens the safety of power production. The enhanced aerodynamic effect of the seal on the rotor in high-parameter steam turbine can aggravate the vibration of the shaft system. In this paper

besides studying the vibration response of the cracked shafting

the dynamic response is analyzed based on the characteristic frequency of the frequency slice wavelet transform (FSWT) method in the refined response within the specified interval

considering the influence of steam excitation and other nonlinear factors on the shafting

. The results show that after the coupled steam flow excitation

the energy conversion and superposition between the frequency doublings in the time domain curve of the cracked shaft system are intensified. When the load of the unit increases

the system gradually changes from a "single-period" chaotic motion to a "two-period" chaotic motion. The span of the first frequency doubling is gradually reduced by 7.64%

11.66%

and 22.69%

and the fourth frequency doubling shows a small "wave-like" change.

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