基于功能单元的分层诊断技术研究及在航天器中的应用

Research and Application of Hierarchical Diagnosis Technique for Spacecraft Based on Functional Unit

复杂系统多故障诊断的计算复杂性一直是一个难题。现给出了一种定性诊断模型:将功能单元引入到系统建模中并与结构抽象技术相结合构建分层诊断模型(SPS树)。推理时运用分层诊断策略及相关诊断定理,减少了多故障诊断的计算量,提高了效率。此方法在某卫星电源系统中得到了应用。证明该方法诊断速度快,诊断结果完备,可以实现对未知故障的诊断,适用于卫星这类复杂系统的多故障诊断。

Computational complexity of complex system multiple fault diagnosis is a puzzle at all times. A qualitative diagnosis model is given in this paper. During of modeling system, hierarchical diagnosis model （SPS tree） is established by the combination of functional unit and the technique of structural abstraction. Hierarchical diagnosis strategy and associated diagnosis axioms are used during of reasoning, This approach can reduce the computational complexity of multi-faults diagnosis and increase efficiency. The application of a satellite power system proves that the reasoning is very fast, the diagnosis results are complete and unknown faults can be diagnosed which are suitable in multiple fault diagnosis for complex satellite system.