挂飞振动是空空导弹最重要环境因素之一,研究发动机挂飞疲劳寿命对掌握其环境使用边界具有重要意义。文中利用谐波叠加法模拟发动机所受时域随机振动载荷,结合有限元软件进行了挂飞振动动态模拟,获得了某型发动机应力变化规律。在此基础上,利用雨流计数法统计了该发动机装药危险位置应力循环信息,依据Miner疲劳累积损伤理论预估了该发动机装药挂飞振动疲劳寿命,最后对发动机装药挂飞寿命与推进剂疲劳极限关系进行了分析。

One of the most important environmental factors is hanging flight vibration for air-to-air missile, it is significant to study fatigue life of hanging flight vibration for grasping environmental using limits.Harmony superposition method was applied to simulate load of time domain, and time-stress course of dynamic simulation was acquired by using finite element software.On the basis of this simulation, the rain-flow method was applied to the stress circles for statistics, and the fatigue life of SRM was evaluated by applying Miner's cumulative damage theory.Finally, the relation between fatigue life of SRM and endurance limit of propellant was analyzed.