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Fatigue Reliability Analysis of a Compressor Disk Based on Probability Cumulative Damage Criterion

机译：基于概率累积损伤准则的压气机盘疲劳可靠性分析

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摘要

The reliability of aero engine has a direct impact on the flight safety of the whole plane. With the continuous improvement of performance requirements of aero engines, the related fatigue and reliability problems also appear. For the fatigue failure characteristics of the typical component (compressor disk) in an aero engine, the fatigue reliability of its multi-site damage structure in service is analyzed by using probability cumulative damage criterion in this paper. The probability distribution definitions of life, damage and damage threshold are discussed and the relationship among them is also introduced by the new proposed criterion. Meanwhile, a method to determine the probability distribution of cumulative damage threshold and probability life prediction is carried out, based on which a hierarchical index system of statistical analysis and reliability modeling principle on the system level is further constructed for compressor disk. At the end of the paper, a certain cruise of fighter plane is analyzed to verify the validity of the new model. Emphasizing the difference between the compressor disk and traditional component, the new reliability analysis model developed in this study is basically reasonable for most of the load histories for the compressor disk, other than the traditional one, especially for the changeable and complex cruise missions.
机译：航空发动机的可靠性直接影响整个飞机的飞行安全。随着航空发动机性能要求的不断提高，也出现了相关的疲劳和可靠性问题。针对航空发动机中典型零件（压气机盘）的疲劳失效特性，采用概率累积损伤准则分析了其在役多部位损伤结构的疲劳可靠性。讨论了寿命，损伤和损伤阈值的概率分布定义，并通过新提出的准则介绍了它们之间的关系。同时，建立了确定累积损伤阈值的概率分布和概率寿命预测的方法，在此基础上，进一步构建了压缩机盘的统计分析和可靠性建模原理的层次索引系统。最后，分析了战斗机的一定巡航速度，以验证新模型的有效性。强调压缩机盘与传统组件之间的差异，本研究开发的新可靠性分析模型对于压缩机盘的大多数载荷历史（除了传统载荷盘而言）而言都是合理的，尤其是对于可变和复杂的巡航任务。

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