辅助动力装置安装拉杆的疲劳分析

Fatigue Analysis of APU Mount Strut

辅助动力装置是运输机的重要设备,其重量较大,安装拉杆作为传载部件,受力严重。为了保证辅助动力装置在飞机服役期限内都能可靠固定,需要对安装系统进行疲劳分析。疲劳载荷谱包括正常服役载荷和故障状态下的风车载荷,研究DFR评定方法在拉杆寿命计算中的应用,结合疲劳损伤累积理论,计算拉杆主要部件疲劳累积损伤。研究表明,DFR能够直接有效的评定安装拉杆寿命,合理的设计,能使得安装拉杆满足设计寿命目标。

Auxiliary power unit is an important equipment of transport aircraft,its weight is larger,the installation of the rod as a transmission component,the stress is serious. In order to ensure that the auxiliary power unit can be reliably fixed in the service period of the aircraft, it is necessary to carry out the fatigue analysis of the installation system. Fatigue load spectrum of normal service loads and failure state of windmill load, DFR evaluation method of research in the calculation of the rod life applications,based on the fatigue cumulative damage theory,calculation of the main components of the rod fatigue cumulative damage. The study shows that DFR can directly and effectively evaluate the life of the installation rod and reasonable design,which can make the installation rod to meet the design life goal.