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Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique.

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  • 1School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China.

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Summary
This summary is machine-generated.

This study introduces a new method for structural damage identification using mode shapes, improving accuracy and robustness against noise and multiple damages. The approach enhances structural health monitoring capabilities.

Keywords:
damage localizationoperational modal analysispower spectral density transmissibilitypseudo-excitation methodsingular value decomposition

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Area of Science:

  • Structural Engineering
  • Mechanical Engineering
  • Vibration Analysis

Background:

  • Mode shape-based methods are effective for damage localization but sensitive to measurement noise.
  • Conventional methods struggle with multi-damage scenarios and require specific modes.

Purpose of the Study:

  • To develop a robust and accurate structural damage identification method.
  • To address limitations of existing mode shape-based techniques regarding noise and multi-damage localization.

Main Methods:

  • A joint singular value decomposition (JSVD) technique for robust mode shape estimation from noisy data.
  • An improved pseudo-excitation method for baseline-free damage localization index calculation.
  • A data fusion scheme to integrate information from different modes for enhanced localization.

Main Results:

  • The proposed JSVD method shows superior performance in handling measurement noise compared to traditional transmissibility methods.
  • The novel damage localization index effectively quantifies local dynamic equilibrium changes without prior structural knowledge.
  • The data fusion scheme outperforms Bayesian fusion, providing more accurate and robust multi-damage localization.

Conclusions:

  • The developed method offers significant improvements in damage localization accuracy and robustness.
  • The approach is validated through numerical and experimental studies on cracked cantilever beams.
  • This technique enhances structural health monitoring by overcoming noise and multi-damage challenges.