针对飞机液压能源系统的故障诊断问题, 介绍了基于模型的故障诊断方法。基于飞机液压能源系统的结构和行为, 分析了系统各组件的行为模式及组件之间的拓扑结构。利用面向对象的建模语言Rodelica建立各组件的行为模型, 进而搭建系统的行为模型。将行为模型的预测值与实际系统的观测值的偏差作为诊断推理引擎的输入, 实现了液压能源系统的故障诊断, 得出常见故障现象的诊断决策树。诊断结果表明, 所建立的飞机液压能源系统的行为模型是准确可靠的, 所得诊断结果能有效地定位故障并确定故障组件的状态, 具有工程实用性。
Aimed at the fault diagnosis of the aircraft hydraulic power system, model-based diagnosis was introduced. On the basis of the architecture and behavior of the hydraulic power system, the paper analyzes behavioral modes of components and topological structure between the components. Using the object-oriented modeling language Rodelica, behavioral models of different components were established, and the behavioral model of hydraulic power system was built. The deviation between predicted data of the behavioral model and observed data of the real system is taken as input of diagnostic reasoning engine. Then the fault diagnosis of the hydraulic power system was achieved, and diagnostic decision trees of common fault diagnosis were obtained. Diagnostic results show that the behavioral model of the aircraft hydraulic power system was accurate, which could effectively locate the faulty components and identify their working condition. It is validated that the methodology is useful in engineering application.
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