MECHANICAL ENGINEERING |
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Electromagnetic ultrasonic SH guided wave detection method for grounded flat steel defects based on synchrosqueezed wavelet transforms |
ZHOU Kai1, ZHANG Ruizhe1, YE Kuan1, LI Hongda1, WANG Zhe2, HUANG Songling2 |
1. State Grid Beijing Electric Power Research Institute, Beijing 100072, China; 2. State key Laboratory of Control and Simulation of Power System and Generation Equipments, Tsinghua University, Beijing 100084, China |
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Abstract The grounding grid plays a vital role for ensuring reliable power system operations. However, the buried environment around the grounding grid can result in grounding device defects, so the grounding grid must be periodically tested. This paper presents a SH guided wave detection method based on linear frequency modulation excitation and synchrosqueezed wavelet transforms for grounded flat steel power systems. The system uses a permanent magnetic array SH guided wave transducer which is simple and suitable for flat steel structures. The transducer is excited with a linear frequency modulation signal with synchrosqueezed wavelet transforms used to analyze the signal. Identification of the overlapping guided wave signals in the time-frequency plane effectively distinguishes between various defects and end faces. Signals from finite element simulations and experiments were then used to evaluate the signal analysis method. The calculated distance errors were all within 3%, which shows that the method can accurately extract the guided wave travel times and accurately locate defects. Comparisons with results using short-time Fourier transforms and Wigner distributions show the advantages of the time-frequency aggregation of the synchrosqueezed wavelet transforms.
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Keywords
electromagnetic ultrasonic transducers
SH guided waves
flat steel
synchrosqueezed wavelet transforms
defect detection
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Issue Date: 10 November 2022
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