Calculation of Mechanical Vibration Fatigue Damage and Life Evaluation Based on Improved Dirlik Method with Attention Mechanism

SHENG Pei; LI Wei; CUI Weicheng; GONG Jing

doi:10.7643/issn.1672-9242.2026.03.017

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (3) : 163-169. DOI: 10.7643/issn.1672-9242.2026.03.017

Special Issue—Equipment Service Environment and Performance Testing

Calculation of Mechanical Vibration Fatigue Damage and Life Evaluation Based on Improved Dirlik Method with Attention Mechanism

SHENG Pei¹, LI Wei¹, CUI Weicheng¹, GONG Jing^2,*

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Abstract

The work aims to improve fatigue damage calculation and service life assessment of the traditional Dirlik method to deal with the problem that the traditional Dirlik method treats all frequency components equally in the calculation of mechanical vibration fatigue damage, which easily masks the information of frequency bands critical to damage and is affected by irrelevant noise, leading to distorted damage calculation and biased service life evaluation. Firstly, the time-domain vibration waveforms generated by specific equipment actions were taken as input and converted into power spectral density (PSD). Then, through the attention mechanism, weights were dynamically assigned to different frequency components based on the material's frequency response characteristics to highlight the frequency bands critical to damage and suppress noise, thereby generating a weighted power spectral density. Finally, combined with the weighted power spectral density, the fatigue damage calculation and service life evaluation of the improved Dirlik method were completed through spectral moment extraction, shape parameter calculation, equivalent load conversion, and damage quantification. Experimental results showed that the improved method could effectively enhance the energy characteristics of frequency bands critical to damage, significantly suppress interference from irrelevant noise frequency bands, and remarkably improve the accuracy of fatigue damage calculation. The improved Dirlik method based on the attention mechanism breaks through the limitation of the traditional method's equal treatment of all frequencies, exhibits good adaptability and reliability, and provides an effective technical solution for fatigue life evaluation in mechanical vibration monitoring.

Key words

mechanical vibration / attention mechanism / Dirlik method / fatigue damage / life evaluation / power spectral density

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SHENG Pei, LI Wei, CUI Weicheng, GONG Jing. Calculation of Mechanical Vibration Fatigue Damage and Life Evaluation Based on Improved Dirlik Method with Attention Mechanism[J]. Equipment Environmental Engineering. 2026, 23(3): 163-169 https://doi.org/10.7643/issn.1672-9242.2026.03.017

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