综合模块化航电系统性能退化Lévy模型

综合模块化航空电子系统(integrated modular avionics, IMA)是现代航空的核心系统之一, 其性能状态对飞机的安全性有着重要的影响。针对IMA性能退化特性分析问题, 首先依据IMA运行管理机制, 在现有测点的基础上, 遴选了间歇故障发生频次和功能完成时间作为表征IMA性能状态的健康特征参数。然后, 根据IMA自身运行特点证明了IMA功能完成时间历程是一个Lévy过程。提出了IMA性能退化Lévy模型, 构建了单因素影响和多因素综合影响的IMA性能退化模型。最后, 搭建了IMA仿真平台, 获取了IMA性能退化Lévy模型参数, 仿真了IMA性能退化历程, 验证了模型的有效性。

Performance degradation Lévy model of integrated modular avionics

Integrated modular avionics(IMA)is one of the core system in modern airplane,and its performance has a marked impact on the flight safety.This paper focuses on the degradation characteristics of IMA.The IMA operation management mechanism is analyzed firstly.The intermittent fault and the function completion time are selected as IMA health characteristic parameters based on the existed sensors.Secondly,this paper proves that the completion time of avionics functions conforms to Lévy process based on IMA operation management mechanism.An IMA performance degradation Lévy model is proposed.The IMA performance degradation Lévy models under the influence of the single factor and multiple factors are established,respectively.Finally,a hardware simulation platform is built to figure out the parameters of the IMA performance degradation Lévy model.The performance degradation process of IMA is simulated,and the effectiveness of the proposed model is validated.