应用神经网络的航空发动机故障诊断仿真研究

摘要

Traditional scheduled maintenance systems are costlv. labor-intensive, and typically provide noncomprehensive detection and diagnosis of engine faults. The engine monitoring system (EMS) on modern aircrafts has the potential to provide maintenance personnel with valuable information for detecting and diagnosing engine faults. In this paper, an RBF neural network approach is applied to aeroengine gas-path fault diagnosis. It can detect multiple faults and quantify the amount of deterioration of the various engine components as a function of measured parameters. The results obtained demonstrate that the accuracy of diagnosis is consistent with practical requirements.The approach takes advantage of the nonlinear mapping feature of neural networks to capture the appropriate characteristics of an aeroengine. The methodology is generic and applicable to other similar plants having high complexity.%传统的定期维护制度成本高,劳动强度大,且对发动机故障的诊断和探测能力十分有限.现代飞机上的发动机监控系统(EMS)具有向维护人员提供有关发动机故障信息的潜在能力.本文将径向基函数(RBF)神经网络应用到航空发动机故障诊断中.该方法能够依靠测量参数探测发动机多个气路故障,并对各大部件的性能退化进行定量的诊断.仿真结果表明,诊断的精度能够满足实际应用的需要,神经网络的非线性映射能力可用来捕捉发动机的特性.该方法具有通用性,在其他类似的复杂机械中也可以获得应用.