Ogaili, A., Hamzah, M., Jaber, A., Ghane, E. (2024). Application of Discrete Wavelet Transform for Condition Monitoring and Fault Detection in Wind Turbine Blades: An Experimental Study. , 42(1), 104-116. doi: 10.30684/etj.2023.142023.1516
Ahmed A. Ogaili; Mohsin N. Hamzah; Alaa Ab. Jaber; Ehsan Ghane. "Application of Discrete Wavelet Transform for Condition Monitoring and Fault Detection in Wind Turbine Blades: An Experimental Study". , 42, 1, 2024, 104-116. doi: 10.30684/etj.2023.142023.1516
Ogaili, A., Hamzah, M., Jaber, A., Ghane, E. (2024). 'Application of Discrete Wavelet Transform for Condition Monitoring and Fault Detection in Wind Turbine Blades: An Experimental Study', , 42(1), pp. 104-116. doi: 10.30684/etj.2023.142023.1516
Ogaili, A., Hamzah, M., Jaber, A., Ghane, E. Application of Discrete Wavelet Transform for Condition Monitoring and Fault Detection in Wind Turbine Blades: An Experimental Study. , 2024; 42(1): 104-116. doi: 10.30684/etj.2023.142023.1516

Application of Discrete Wavelet Transform for Condition Monitoring and Fault Detection in Wind Turbine Blades: An Experimental Study

Engineering and Technology Journal
Article 8, Volume 42, Issue 1, January 2024, Pages 104-116    PDF (1.06 M)
Document Type: Research Paper
DOI: 10.30684/etj.2023.142023.1516
Authors
Ahmed A. Ogaili* 1; Mohsin N. Hamzah1; Alaa Ab. Jaber1; Ehsan Ghane2
1Mechanical Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
2Physics Dept., University of Gothenburg, Gothenburg, Sweden.
Abstract
Effective structural monitoring maximizes efficiency in wind turbines, a crucial renewable energy asset. Using advanced condition monitoring techniques is crucial for reliability. This experiment shows how to use DWT and FFT for wind turbine blade fault detection. DWT allowed for multiresolution analysis of vibration signals from a healthy and eroded lab-scale turbine blade under controlled wind speeds. A 5-level DWT decomposition identified frequency sub-bands with localized fault information. The FFT post-processing of level 5 approximation coefficients revealed precise modal frequency shifts between blade states. The healthy blade showed a dominant 16 Hz mode that matched operational dynamics. Erosion caused a 24 Hz fault signature that was not present in the intact blade. Automated blade state classification was 98% accurate with 8 Hz modal separation. DWT's high sensitivity comes from nonstationary signal filtering and FFT's high-resolution spectral quantification. Comparative metric analysis confirmed DWT's superiority over FFT and statistical methods. The integrated approach combined complementary techniques to detect small defects that were previously unnoticeable. This study confirms the effectiveness of using DWT's strengths for monitoring wind turbine structural health in the future. The approach enables switching from time-based maintenance to data-driven prognostics, improving reliability by detecting failure precursors early. This study confirms DWT's effectiveness in identifying wind turbine blade faults and advancing critical techniques to prevent catastrophic failures.‎

Highlights
  • The paper presents an experimental study utilizing DWT & FFT to detect faults in a lab-scale wind turbine blade.
  • DWT is highly advantageous for wind turbine blade monitoring .
  • A 5-level DWT decomposition was used to filter vibration data into relevant sub-bands for fault detection.
  • The healthy blade showed a 16 Hz mode matching dynamics, while the eroded blade introduced a new 24 Hz fault signature.
  •   Blade state classification was highly accurate (98%).
Keywords
fault diagnosis; blade erosion; DWT; vibration signals
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