针对无人机系统组成结构复杂、影响其可靠性可用性的维修保障因素较多的问题，基于设备寿命分布假设，构建了考虑预防性维修和起飞前故障检查的系统平均故障间隔时间(mean time between failures，MTBF)和使用可用度解析模型。并模拟无人机的维修过程，采用蒙特卡罗仿真的方法进行MTBF和使用可用度的仿真分析。解析与仿真两种方法的结果具有较好的一致性，可为无人机确定保障方案提供技术途径。
Modeling and simulation of UAV system's MTBF and operational availability
Considering the unmanned aerial vehicle(UAV)system has a complex structure,and there are many maintenance support factors that affect its reliability and availability,an analytical model of UAV system's mean time between failures(MTBF)and operational availability considering preventive maintenance and pre-flight fault detection is constructed,basing on the assumption of equipment life distribution.A Monte Carlo simulation is used to simulate the maintenance process of the UAV and to analyse the MTBF and operational availability.The analytical and simulation methods agree well with each other,which shows that the proposed method could provide support for determining the guarantee scheme for UAVs.
mean time between failures(MTBF)operational availabilitypreventive maintenancepre-flight detection
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