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A novel multi-site damage localization method based on near-field signal subspace fitting using uniform linear sensor

Qiao Bao1, Weiwei Hu1, Qiang Wang1

  • 1College of Automation and College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, People's Republic of China.

Ultrasonics
|June 9, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for locating multiple damage sites using guided waves in structural health monitoring (SHM). The technique accurately identifies closely spaced damage, overcoming limitations of traditional imaging approaches.

Keywords:
Alternative iterationMulti-site damage localizationSignal subspace fittingStructural health monitoring

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Area of Science:

  • Engineering
  • Materials Science
  • Non-destructive Testing

Background:

  • Guided wave-based damage imaging is crucial for structural health monitoring (SHM).
  • Existing compact sensor array imaging methods (e.g., phased array, spatial filtering, MUSIC) face performance degradation with closely spaced multi-site damage.
  • Limitations include array aperture constraints and signal correlation issues in subspace decomposition methods.

Purpose of the Study:

  • To propose a novel near-field signal subspace fitting method for accurate multi-site damage localization.
  • To address the challenge of distinguishing and locating adjacent damage sites in SHM.

Main Methods:

  • A new cost function is constructed based on the equivalence between the signal subspace and the array manifold matrix.
  • Multi-dimensional search is employed to optimize the cost function for damage localization.
  • The method is validated using guided waves on an aluminum panel with three damage sites.

Main Results:

  • The proposed method successfully achieved multi-site damage localization.
  • Experimental results demonstrated low angle errors (less than 4°) and distance errors (less than 35 mm).

Conclusions:

  • The novel near-field signal subspace fitting method effectively overcomes limitations of traditional techniques for multi-site damage localization.
  • This approach offers improved accuracy for identifying closely spaced damage in SHM applications.