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对发生于外场的因发动机空中停车导致的一起二等事故进行了故障分析,针对Z8齿轮双向弯曲疲劳断裂的这个直接失效特征,通过与原型样机进行差异对比分析,找出了中传动匣与最新状态原型机样件的差异,并制订了整机振动测试方案和不同状态的中传动匣与全套不同齿型齿轮的振动应力测试部件试验方案。通过进行整机试验与部件试验对比,并结合振动特性分析,证明了中传动匣自身刚度不足为本次事故的主要原因,而零度弧齿锥齿轮与直齿锥齿轮的差异为本次事故的次要原因。在此基础上,以最新状态的原型机中传动匣样件做为改进设计的依据,重新对中传动匣进行了测绘,并在改进措施贯彻到位之前,对部队正常使用发动机需采取的监控措施进行了研究,制订了完善的使用监控措施并组织实施,确保了部队的正常训练及使用安全。
In this paper, the failure of a second-class accident caused by engine over-air stop in the out-field was analyzed. According to the direct failure characteristic of Z8 gear double-direction bending fatigue fracture, the differences between the middle gear box and the latest State prototype prototype differences and to develop a machine vibration test program and the different conditions in the box and a full set of different gear teeth vibration test components test program. By comparing the whole machine test with the parts test and the analysis of the vibration characteristics, it is proved that the rigidity of the middle gear box is the main cause of this accident. The difference between the zero-degree bevel gear and the straight bevel gear is the accident Secondary reason. On the basis of this, taking the latest prototype of the transmission box as the basis for improving the design, re-centering the transmission box was mapped, and before the improvement measures in place, the normal use of the engine force the military to take control measures Conducted a study, developed a comprehensive monitoring and control measures to use and organize the implementation of the force to ensure the normal training and safety.