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time synchronous averaging Based on Cross-power Spectrum

Chinese Journal of Mechanical Engineering 2023年第2期36卷 198-205页

作者： Ling Wang Minghui Hu Bo Ma Zhinong Jiang Key Laboratory of Engine Health Monitoring‑control and Networking of Ministry of Education Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of High‑end Mechanical Equipment Health Monitoring and Self‑Recovery Beijing University of Chemical TechnologyBeijing 100029China

Periodic components are of great significance for fault diagnosis and health monitoring of rotating *** synchronous averaging is an effective and convenient technique for extracting those ***,the performance of time synchronous averaging is seriously limited when the separate segments are poorly *** paper proposes a new averaging method capable of extracting periodic components without external reference and an accurate period to solve this *** this approach,phase detection and compensation eliminate all segments'phase differences,which enables the segments to be well *** effectiveness of the proposed method is validated by numerical and experimental signals.

关键词： time synchronous averaging Phase detection Cross-power spectrum Fault diagnosis

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Vibration-based synchronous sampling and its application in wind-turbine drive-train-condition monitoring

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Clean Energy 2021年第1期5卷 79-92页

作者： Ting Hu Hongyi Wan Huageng Luo National Institute of Clean-and-Low-Carbon Energy China EnergyFuture Science CityChangping DistrictBeijing 102211P.R.China United Power Sida Company China EnergyWest 4th Ring Middle RoadHaidian DistrictBeijing 100039P.R.China Xiamen University 4221–134 Xiang’an South RoadXiang’an DistrictXiamenFujian 361102P.R.China

Utilizing shaft-speed information to analyse vibration signals is an important method for fault diagnosis and condition monitoring of rotating machineries,especially for those running at variable ***,in many cases,shaft-speed information is not always available,for a variety of ***,in most of the measurements,the shaft-speed information is embedded in the vibration response in many different forms,such as in the format of the fundamental shaft-rotation-frequency response and its harmonics,and the gear-meshing-frequency response and its harmonics,*** signal processing can be used to extract the shaft instantaneous speed from the measured vibration *** existing instantaneous shaft-speed-identification methods,a narrow-bandpass filtering technique is used explicitly or *** a complex gearbox system,such as that used in a wind turbine,the gear-meshing-response component could be modulated by many other shaft speeds,due to the configuration of the gearbox or due to the existence of component *** a result,it is very difficult to isolate a single vibration-response component for instantaneous shaft-speed *** this paper,an innovative approach is *** instantaneous shaft speed is extracted based on maxima tracking from the vibration-response spectrogram.A numerical integration scheme is employed to obtain the shaft instantaneous ***-domain synchronous resampling is then applied to the vibration data by using the instantaneous phase *** to the nature of noise suppression in the numerical integration,the accuracy of synchronous sampling is greatly *** proposed approach demonstrates the feasibility and engineering applicability through a controlled laboratory test case and two field wind-turbine *** detailed results and conclusions of this research are presented at the end of this paper.

关键词： wind turbine condition monitoring tacho-less instantaneous speed instantaneous phase synchronous sampling time synchronous averaging

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