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A Lamb wave time-reversal field reconstruction method for damage detection with automatic focusing determination
Sunquan Yu1, Chengguang Fan1, Meng Zhang1
1College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China.
Ultrasonics
|May 17, 2023
Summary
This study introduces a novel wavefield reconstruction method using Lamb waves for plate damage detection. It offers faster Lamb wavefield simulation and automatic damage focusing time determination for improved accuracy.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-Destructive Testing
Background:
- Lamb wave-based damage detection is crucial for structural health monitoring.
- Existing methods face challenges in rapid Lamb wavefield simulation and accurate damage focusing time determination.
- Efficient damage localization and sizing are essential for reliable structural integrity assessment.
Purpose of the Study:
- To propose an efficient wavefield reconstruction method with time-reversal operation (WR-TR) for Lamb wave-based damage detection in plates.
- To address the limitations of slow wavefield simulation and manual focusing time selection in current techniques.
- To enable rapid and accurate identification of damage location and size using Lamb waves.
Main Methods:
- Developed a multi-modal superposition finite difference time domain (MS-FDTD) method for fast Lamb wave propagation simulation.
- Introduced a maximum energy frame (MEF) method for automatic focusing time determination to detect damage.
- Employed wavefield reconstruction with time-reversal (WR-TR) for damage imaging.
Main Results:
- The MS-FDTD method significantly reduces calculation costs for Lamb wavefield simulation.
- The MEF method successfully identifies the focusing time, enabling detection of multiple damage points.
- The proposed WR-TR method demonstrates robustness against noise, good anti-distortion capabilities, and broad applicability with various array layouts.
- Simulations and experiments validate the effectiveness of the proposed damage detection technique.
Conclusions:
- The proposed WR-TR method, combined with MS-FDTD and MEF, provides an efficient and accurate solution for Lamb wave-based damage detection in plates.
- This approach overcomes key limitations of existing methods, facilitating quicker and more reliable structural health monitoring.
- The technique shows significant potential for practical applications in non-destructive testing and structural integrity assessment.
