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<p>This study proposes a novel modal circle-fitting method to estimate natural frequency and damping ratio from output-only acceleration. Validated through vibration-fatigue testing on an aerospace bracket, the method successfully detects initial, non-visible fatigue damage through key indicators: a decrease in natural frequency under random vibration and the emergence of a ‘split-peak’ pattern under sinusoidal excitation.</p>

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An acceleration-only modal circle-fitting method for in-situ fatigue damage detection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月28日

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  • Da Som Kang,
  • Seung-Hoon Bae,
  • Seunghun Baek

摘要

This study proposes a novel modal circle-fitting method to estimate natural frequency and damping ratio from output-only acceleration. Validated through vibration-fatigue testing on an aerospace bracket, the method successfully detects initial, non-visible fatigue damage through key indicators: a decrease in natural frequency under random vibration and the emergence of a ‘split-peak’ pattern under sinusoidal excitation.