双发飞机发动机疲劳损伤差异分析

Fatigue Damage Analysis of Aircraft Twin-engine

以某型飞机发动机实测飞参为依据,选取该机的典型飞行任务剖面,通过飞参数据的预处理、雨流计数法、线性累积损伤理论将提取的有效载荷折合到标准循环,并进一步将该典型任务剖面划分为4个典型区段进行疲劳损伤分析。统计表明,该型飞机配装发动机个体的疲劳损伤均服从威布尔分布,但单机损伤差异较大。在典型飞行任务段中,不同架次的同侧发动机在起飞段、巡航段相差3-4倍,降落段甚至相差超过10倍,而同架飞机上左右发动机的疲劳损伤差距相对较小。统计结果表明,发动机疲劳损伤的分布服从威布尔分布,通过开展单机寿命监控,可以更合理地安排飞行训练,延长发动机的使用寿命。

The aircraft typical mission profile is chosen from its actual flight data.Through the pretreatment of flight data,rain-counting method and linear cumulative theory,effective loads are extracted and converted into standard cycles,then the profile is divided into four parts to analyze the fatigue damage.The statistical result shows that the fatigue lives of the aircraft right and left engine are submitted to Weibull distribution,but solo-engine is greatly different in fatigue damage.In typical mission section,difference in the take-off and the cruise subsection can reach to 3～4 times,and landing subsection even reach to 10 times for the engines in the same side of different aircraft,however the difference of the fatigue damages for the left-side and the right-side engines in the same aircraft is rather small.The statistical results show that engine fatigue damages are submitted to Weibull distribution.Through implementing single aero-engine life surveillance,flight training can be arranged advisably and engine service life can be prolonged effectively.