To address the challenges of flow‑induced vibration monitoring and prevention in typical industrial pipelines, a method for predicting fatigue life based on the equivalent power spectral density is proposed. First, a fatigue monitoring model is established, and a pipeline vibration test bench is constructed through simulation. Using experimental results as examples, fatigue life estimates are calculated using both the time‑domain rain‑flow counting method and frequency‑domain methods, and their performances are compared. The results show that the frequency‑domain method based on equivalent acceleration power spectral density effectively reduces spectral leakage and provides better prediction of fatigue life for pipelines than traditional frequency‑domain approaches. On average, the prediction accuracy improves by 3.53%, and the mean prediction error is the lowest. This study offers an effective approach for predicting the remaining fatigue life of industrial pipelines and offers a novel method for fatigue damage assessment.
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