关键词: 飞行参数;飞行换算率;疲劳损伤;差异分析 

Abstract: In order to provide identifiable life monitoring of single aeroengine, the flight parameters of the same type aeroengine from two users were analyzed and the rain-flow counting method to achieve the effective load spectrum was used. By using linear damage accumulation theory to calculate the fatigue damage of critical parts and comparing the value with fatigue damage caused by standard cycles, the flight conversion ratio was achieved.It was compared for the flight conversion ratio of the same side engines, left and right engine of the same plane and the engines belonging to different users. The results show that the flight conversion ratio difference of the same side engines is relative bigger, the same to the engines belonging to different users, and difference between left and right engine of the same plane is relative smaller. The statistical results show that as a whole the flight conversion ratios of the engines of the two users are submitted to lognormal distribution. The flight conversion ratios of the high and low pressure rotor of some type of engine are submitted to lognormal distribution. 

Key words: Flight parameters; Flight conversion ratio; Fatigue damage; Difference analysis