Abstract
In this paper, a quantitative detection method of the weak ultrasonic guided wave (UGW) signal based on information entropy of the Duffing chaotic system is proposed. It can simultaneously identify the location and size of small defects in pipelines. First, by adjusting the driving force amplitude of the Duffing system, the system is in a critical state from period to chaos. When the weak UGW is added on the driving force, the state of the Duffing system will change. It can be used to detect weak signal. To realize the quantitative detection of UGW, a method based on information entropy is presented in this paper. By analyzing the influence of UGW on the driving force amplitude of the Duffing equation, a sensitive damage index is constructed to indicate the signal strength. Furthermore, a time-moving window function is introduced. By scanning the recording signal, the defect location can be identified using the damage index. The experimental studies show that the proposed method is validity for detecting small defects in pipeline, and simultaneously identify the size and location of the defects. This method has a strong noise immunity and significantly improves the sensitivity of small defects detection in pipelines.
Highlights
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A method to calculate the information entropy of Duffing system is proposed.
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A method for detecting small defects in pipe is proposed based on the sensitive dependence on initial conditions and information entropy of chaotic system.
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The method is successfully used to detect small defect detection in a pipe.
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The data that support the findings of this study may be shared upon email request with researchers interested in develo** novel ideas and methods.
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Acknowledgements
The work was supported by the National Natural Science Foundation of China (No. 11872261), the Key Laboratory of Robotics and Intelligent Equipment in General Universities of Guangdong Province (2017KSYS009), Dongguan Institute of Technology Supported by Robotics and Intelligent Equipment Innovation Center (KCYCXPT2017006).
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Cheng, M., Zhang, W., Zhang, C. et al. Application of chaotic information entropy for ultrasonic guided wave detection in pipe. J Civil Struct Health Monit 14, 29–39 (2024). https://doi.org/10.1007/s13349-022-00668-z
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DOI: https://doi.org/10.1007/s13349-022-00668-z