航空发动机轮盘概率风险评估方法

Probabilistic Risk Assessment Method of Aeroengine Disk

建立了一种基于概率损伤容限的航空发动机压气机轮盘风险评估方法,考虑了缺陷发生率、缺陷分布、应力与缺陷检测概率对涡轮盘失效风险的影响。基于适航规章与咨询通告的要求,建立了考虑检查与不考虑检查两种不同的概率风险评估流程。结合有限元应力分析和断裂力学方法计算了压气机轮盘失效风险随循环变化曲线,与咨询通告AC 33.14-1给出的案例进行了对比,验证了本文提出方法的准确性与合理性。

A risk assessment method of aeroengine compressor disk based on probabilistic damage tolerance is established. The effects of defect occurrence, defect distribution, stress and defect detecting probability on the risk of compressor disk failure are considered. The risk assessment processes with and without considering the in- spection are established based on the requirements of the airworthiness regulations and advisory circular. By combining the finite element analysis and the fracture mechanics approach, the changing curve of the compressor disk failure risk versus cycle number is given. The result is compared with that in AC 33.14-1 to test and verify the accuracy and rationality of the developed method.