某发动机涡轮叶片使用寿命可靠性分析

发动机的载荷谱是发动机结构寿命研究的依据.利用某短寿命发动机的开车数据,对其高压涡轮叶片使用寿命进行了预测.建立了发动机等效寿命消耗计算模型,采用数据压缩处理技术,有效地提取了发动机的工作载荷.根据发动机短使用寿命这一特点,用威布尔分布模型描述此发动机涡轮叶片寿命分布,建立了发动机寿命可靠性模型,采用不完全寿命数据的中位秩法对发动机叶片寿命进行可靠性计算.随着可靠性增长,发动机寿命不断提高,考虑样本的时效性,用动态的威布尔分布模型来描述此发动机可靠性的增长,以便发动机在研制过程中的可靠性评估.

Reliability lifetime analysis of the turbine blade of turbofan engine

The loading spectrum is the foundation on which the life analysis of the aeroengine structure is discussed. The life usage consumption of turbine operating blade of some typical missile turbofan engine was predicted by working data processing. The life consumption models was established on which the working data was processed and the loading spectrum of the aeroengine was gained.Distribution of life consumption of the blade was discussed by the Weibull distribution model, and based on which reliability anglicizing models was established. The reliability methods of calculating the usage life by using the middle rank of incomplete life data in the statistical field were introduced. The life of the engine gradually develops with the increases of the reliability growth. Considering the time effect of the sample, the dynamic Weibull distribution model embodies the reliability growth of this engine. The analytical methods were used to estimate the engine′s reliability at research stage.