1. Fatigue Reliability Assessment Method for Aero-engine Compressor Blade-disk System with Failure Dependency between Components Based on Response Surface Method
- Author
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Wenxue Qian, Xianhai Zeng, Shuanghui Huang, and Xiaowei Yin
- Abstract
The compressor blade-disk system of an aero-engine is a complicated system with numerous components, and the failures of components are related. To evaluate its reliability accurately and efficiently, a fatigue reliability assessment method to handle the issues with failure dependency between components was proposed. Firstly, the finite element analysis was carried out considering the dispersion of load and material; secondly, the probabilistic distributions of stress, strain, and fatigue life of components were fitted by the response surface method; finally, the multi-component failure-dependent reliability model (MCFDM) of the compressor blade-disk system was established based on the dependent failure system reliability theory. Based on this model, the fatigue life of the blade-disk system at varying reliability levels and the reliability and failure probability at varying specified life levels were calculated. The results of MCFDM are compared with those of the independent failure reliability assessment model(IFM) and the traditional Monte Carlo method(MCM). It is demonstrated that the system reliability calculated by IFM is too optimistic, while MCM requires a large number of samples based on the finite element model directly. In comparison, MCFDM can offer results with sufficient accuracy and higher efficiency.
- Published
- 2022
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