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| Fatigue Life Prediction Method of Airborne Hydraulic Drive Based on Frequency Domain Analysis |
| Received:August 08, 2024 Revised:September 03, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.09.016 |
| KeyWord:driver spectral bandwidth coefficient three-interval method Weibull distribution Dirlik model rainflow counting method |
| Author | Institution |
| LIU Jijun |
National Key Laboratory of Strength and Structural Integrity, Aircraft Strength Research Institute of China,Xi'an , China |
| YU Qin |
Institute of Aviation Equipment, Qing'an Group Corporation Limited, Xi'an , China |
| LI Gang |
Institute of Aviation Equipment, Qing'an Group Corporation Limited, Xi'an , China |
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| Abstract: |
| The work aims to employ the timedomain rainflow method along with four frequencydomain vibration fatigue analysis techniques to forecast the lifespan of critical locations in an onboard hydraulic drive and study the suitability of frequency domain method. Initially, the finite element random vibration analysis was carried out to obtain the stress PSDs in the critical areas of tabs of the structure. The calculated spectral width coefficients were uniformly clustered within 0.3 to 0.35, marking the transition zone between narrowband and broadband. Subsequently, four representative load spectrum estimation models, namely the three-interval method, the Dirlik rainflow amplitude empirical model, the Rayleigh distribution model and the Weibull distribution model for narrowband processes, were utilized to determine the fatigue life safety factors at the critical locations. The stress PSDs were then transformed into stress-time series, and the fatigue life safety factors were calculated by the rainflow counting method. Lastly, the suitability of the four frequencydomain methods was deliberated against the benchmark of the timedomain fatigue prediction outcomes. The findings indicated that the nine safety factors derived from Dirlik's method were the most trustworthy, with generally reliable results from Rayleigh's method and notably inferior outcomes from the three-interval and Weibull methods. In the transition zone between narrowband and broadband, the Dirlik method is recommended over the three-interval and Weibull methods. |
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