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An acceleration-only modal circle-fitting method detects fatigue damage in aerospace components under random vibration, suggesting effective monitoring.
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.
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Kang et al. (2025) studied this question.
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