模糊Petri网在航天发射系统故障诊断中的应用研究

Research on Method of Fault Diagnosis Based on Fuzzy Petri Net for Space Launch System

航天发射系统结构复杂,各分系统相互耦合,且故障传播模式多样化,故障特征和故障模式之间存在着模糊关系。因此,本文提出利用模糊Petri网对航天发射系统进行故障诊断,并给出了基于模糊Petri网的故障传播模式模型及反正向结合的推理算法。反向推理用于故障诊断,以选择检测路径,有效地找到发生某一故障的原因及其传播路径;正向推理用于计算该故障发生的真实度。文中以某运载火箭控制系统漏电故障诊断为例,说明了该模型直观、表达能力强的优点,同时表明了算法的适用性和有效性。

The space launch system has complex structure and there are mutual couplings between the sub- systems. The mode of failure transmission is diversified and there are fuzzy relationships between the failure characteristics and the failure modes. This paper proposes the fuzzy Petri nets applying in the fault diagnosis of the space launch system and suggests the model of failure transmitting modes and the backward-forward reasoning algorithm based on the fuzzy Petri nets. The backward reasoning algorithm is used to find the cause of the fault and the path of the fault propagation. The forward reasoning algorithm is used to calcu- late the real value of the fault. The analysis of leak current fault diagnosis model in launch vehicle control system based on fuzzy Petri nets validates the value of the model and the reasoning algorithm in the paper.