Analysis and Simulation for Planetary Gear Fault of Helicopter Based on Vibration Signal

Fault diagnosis for helicopter’s main gearbox based on vibration signals by experiments always requires high costs. To solve this problem,a helicopter’s planetary gear system is taken as an example. Firstly,a simulation model is established by McFadden,and analyzed under ideal condition. Then this model is developed and improved as the delay-time model of the vibration signal which determines the phase-change of sidebands when the system is running. The cause and change-rules of planetary gear system’s vibration signal are analyzed to establish the fault diagnosis model.At the same time,the vibration signal of fault condition is simulated and analyzed. This simulation method can provide a reference for fault monitoring and diagnosis for planetary gear system.     

考虑多故障模式的新型装备更新保修费用预测 考虑多故障模式的新型装备更新保修费用预测

立足我军装备维修保障实际需求,设计了保修策略体系。然后，在此基础上,针对装备更新保修策略费用难预测问题,结合新型装备多故障模式实际,建立考虑多故障模式的一维更新保修策略费用模型。建立了串联系统、并联系统、混联系统和冷储备系统的多部件多故障模式费用预测模型。最后，以冷储备系统为例进行了案例分析,验证了模型的有效性和实用性,为我军开展军民融合式装备维修保障建设提供理论指导和技术支持。