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Numerical and Experimental Research on Non-Reference Damage Localization Based on the Improved Two-Arrival-Time

Yaogang Wu1, Kangwei Liu1, Dinghe Li1

  • 1College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China.

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|November 11, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a non-reference damage localization (NRDL) method using Lamb waves, eliminating the need for a baseline signal. The novel approach enhances damage detection accuracy and enables full-area localization, even for damage outside the sensor array.

Keywords:
Lamb wavesnon-reference damage localization (NRDL) methodpiezoelectric ceramic lead zirconate titanate (PZT) transducers

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Area of Science:

  • Structural Health Monitoring
  • Non-Destructive Testing
  • Acoustic Wave Propagation

Background:

  • Lamb wave-based damage identification typically requires a reference signal from a healthy state.
  • Existing methods face limitations in localizing damage, especially when it lies outside the sensor network.
  • The need for a non-reference approach is critical for practical, real-time structural integrity assessment.

Purpose of the Study:

  • To propose and validate a novel non-reference damage localization (NRDL) method for structural health monitoring.
  • To enable damage identification without relying on a baseline signal from a healthy structure.
  • To achieve full-area damage localization and improve accuracy through optimized sensor placement and signal parameters.

Main Methods:

  • Development of the NRDL method by integrating an improved two-arrival-time difference method (2/ATDM) with the BFGS optimization algorithm.
  • Proposal of specific layout principles for piezoelectric ceramic lead zirconate titanate (PZT) transducer arrays.
  • Optimization of the excitation signal's center frequency and the transducer array configuration.

Main Results:

  • Successful identification of damage located outside the PZT transducer array, a significant advancement over existing techniques.
  • Realization of full-area damage localization within the specimen.
  • Demonstrated substantial improvement in damage location accuracy through method optimization.

Conclusions:

  • The proposed NRDL method effectively overcomes the limitation of requiring a reference signal for Lamb wave-based damage detection.
  • The method allows for comprehensive structural monitoring by enabling damage localization across the entire area, including regions beyond the sensor array.
  • Optimization of signal parameters and array layout significantly enhances the precision of damage identification, paving the way for more robust structural health monitoring systems.