Fault Diagnosis of Aircraft Power Supply Based on Priority Dynamic Fault Tree
In this paper, we propose a novel fault diagnosis method for aircraft power supply system. We constructed the Dynamic Fault Tree (DFT) of the Constant Speed Constant Frequency Alternation Current (CSCF-AC) power supply system based on the Priority Dynamic Fault Tree (PDFT). And by adding a new temporal operator BEFORE (BF) to the usual Boolean operators, we derived the structure function of the top event. Then two laws were provided to reduce this structure function to a sum-of-product canonical form, where each product term defined a minimal cut set (MCS) or a minimal cut sequence set (MCSS) of this fault tree. This approach provides a complete qualitative description of the system without resorting to the corresponding Markov model. Then a 3-layer network diagnosis system was designed and realized for the fault diagnosis of aircraft power supply, including onboard layer, ground maintenance layer and remote expert layer. This 3-layer system enhances the flow of complex fault data into higher expert layer to realize the advanced diagnosis.
Z. T. Huang et al., "Fault Diagnosis of Aircraft Power Supply Based on Priority Dynamic Fault Tree", Advanced Materials Research, Vols. 443-444, pp. 229-236, 2012