YIN Yuan1,2,YANG Li3,XIN Qi3,CHEN Yun-xia1.Analysis of Vibration Mechanics and Lifetime of Accessory Gearbox[J].航空发动机,2018,44(1):52-57
Analysis of Vibration Mechanics and Lifetime of Accessory Gearbox
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Key Words:accessory gearbox  finite element simulation  fatigue lifetime  rain-flow counting method  stress response PSD
Author NameAffiliationE-mail
YIN Yuan1,2,YANG Li3,XIN Qi3,CHEN Yun-xia1 1. School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China
2. Systems Engineering Research Institute, China State Shipbuilding Corporation, Beijing 100094, China
3. AECC Shenyang Engine Research Institute, Shenyang 110015, China 		yinyuanbianji@163.com 
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Abstract:Accessory gearbox is a key component of aeroengine, and acquisition of its lifetime index is critically important. When analyzing the fatigue lifetime of accessory gearbox case, the complex and diverse working environment and loading conditions should be considered. Based on ANSYS Workbench finite element simulation, the stress response PSD of accessory gearbox was calculated,which taken own gravity, fixed constraints, bearing loads, temperature field,and vibration load spectrum into account. After that, the fatigue lifetime was calculated according to the rain-flow counting method through MATLAB program. The results show that the equivalent stress of the vibration spectrum along the Z-axis is max, and the RMS of the stress response PSD at the max point is much greater than the rest of the stress. The difference of the lifetime calculated between using stress response PSD individually and all stress response PSDs is only 50 minutes. Thus, the maximum RMS stress PSD can be used to calculte the fatigue lifetime of accessory gearbox.
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