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Lamb Wave Frequency Diverse Array.

Yanfeng Lang, Zhibo Yang, Laihao Yang

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    This study introduces a novel Frequency Diverse Array (FDA) imaging method for Lamb waves, enabling precise angle-range focusing for enhanced damage localization. The FDA method significantly improves defect identification and interference suppression compared to conventional phased array techniques.

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    Area of Science:

    • Materials Science
    • Non-destructive Testing
    • Wave Physics

    Background:

    • Conventional phased array (PA) methods for Lamb wave imaging are limited to angle focusing.
    • Damage localization in structures using Lamb waves requires advanced focusing capabilities.

    Purpose of the Study:

    • To introduce a Frequency Diverse Array (FDA) imaging method for Lamb waves to achieve angle-range focusing.
    • To develop an FDA focusing imaging method that simultaneously addresses Lamb wave dispersion.
    • To enhance damage localization accuracy and defect identification in structural health monitoring.

    Main Methods:

    • Re-derivation of the FDA energy pattern for Lamb wave applications.
    • Development of an FDA focusing imaging method with anti-dispersive excitations and frequency offsets.
    • Implementation of full matrix capture for data acquisition and a novel total focusing approach considering positive and negative frequency offsets.

    Main Results:

    • The proposed FDA method achieves simultaneous FDA focusing and dispersion elimination for Lamb waves.
    • Superior adjacent defect identification and interference suppression compared to PA methods.
    • Excellent location accuracy and strong parameter robustness demonstrated in experiments.

    Conclusions:

    • The FDA imaging method offers significant advantages over conventional PA techniques for Lamb wave-based damage localization.
    • The method is effective in identifying closely spaced defects and suppressing interference in structural health monitoring.
    • Experimental validation on an aluminum plate confirms the superiority and robustness of the FDA approach.