Fault Diagnosis of Wind Turbine Gearbox based on Non-linear Short-time Fourier Transform and Time-domain Synchronization Average

Zuda Wang; Jian'gang Chen; Ronggen Wu; Zhen Zhang; Haiyang Cai; Guodong Sun

doi:10.16578/j.issn.1004.2539.2021.11.027

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Fault Diagnosis of Wind Turbine Gearbox based on Non-linear Short-time Fourier Transform and Time-domain Synchronization Average

Development·Application | 更新时间：2022-11-10

- Fault Diagnosis of Wind Turbine Gearbox based on Non-linear Short-time Fourier Transform and Time-domain Synchronization Average
- Journal of Mechanical Transmission Vol. 45, Issue 11, Pages: 172-176(2021)
- 作者机构：
  
  1.浙江省风力发电技术重点实验室，浙江杭州 310000
  2.浙江运达风电股份有限公司，浙江杭州 310000
  3.南京航空航天大学自动化学院，江苏南京 211106
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2021.11.027
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王祖达,陈坚钢,吴荣根等.基于NLSTFT与TSA相结合的风电齿轮箱故障诊断[J].机械传动,2021,45(11):172-176.

Wang Zuda,Chen Jian'gang,Wu Ronggen,et al.Fault Diagnosis of Wind Turbine Gearbox based on Non-linear Short-time Fourier Transform and Time-domain Synchronization Average[J].Journal of Mechanical Transmission,2021,45(11):172-176.
王祖达,陈坚钢,吴荣根等.基于NLSTFT与TSA相结合的风电齿轮箱故障诊断[J].机械传动,2021,45(11):172-176. DOI： 10.16578/j.issn.1004.2539.2021.11.027.

Wang Zuda,Chen Jian'gang,Wu Ronggen,et al.Fault Diagnosis of Wind Turbine Gearbox based on Non-linear Short-time Fourier Transform and Time-domain Synchronization Average[J].Journal of Mechanical Transmission,2021,45(11):172-176. DOI： 10.16578/j.issn.1004.2539.2021.11.027.

摘要

针对变工况风电齿轮箱振动信号存在频谱频率模糊问题，以及传统时域同步平均方法需要键相信号及转速稳定要求。提出了一种不需要键相信号可跟踪变转速振动信号瞬时频率的时域同步平均方法。该方法通过非线性短时傅里叶变换（Non-linear short-time fourier transform，NLSTFT）获取变转速齿轮箱振动信号瞬时频率曲线，积分得到瞬时相位曲线；根据瞬时相位对原始信号进行角域重采样，获得阶次信号；最后对阶次信号进行TSA处理进行齿轮故障诊断。以某机组的齿轮箱实测数据，有效地验证了所提方法在风电齿轮箱故障诊断中的有效性及工程实用性。

Abstract

In view of the problem of ambiguity in the frequency spectrum of the vibration signal of the wind power gearbox under variable working conditions，and the traditional time-domain synchronous averaging method，the key phase signal and speed stability requirements are required. A time-domain synchronous averaging method that can track the instantaneous frequency of variable-speed vibration signals without key phase signals is proposed. This method uses non-linear short-time Fourier transform（NLSTFT） to obtain the instantaneous frequency curve of the variable speed gearbox vibration signal，and integrates to obtain the instantaneous phase curve. Resample the original signal in the angular domain according to the instantaneous phase to obtain the order signal. Finally，the order signal is processed by TSA for gear fault diagnosis. Based on the measured data of the gearbox of a unit，the validity and engineering practicability of the proposed method in the fault diagnosis of wind power gearbox are effectively verified.

关键词

非线性短时傅里叶变换瞬时频率齿轮箱角域重采样时域同步平均故障诊断

Keywords

Non-linear short-time Fourier transformInstantaneous frequencyGearboxAngular domain resamplingTime-domain synchronization averageFault diagnosis

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