Multi-fault diagnosis method based on improved SDG

Abstract

The invention discloses a multi-fault diagnosis method based on an improved SDG, and belongs to the field of fault problem diagnosis. The multi-fault diagnosis method based on the improved SDG mainly comprises the step of establishing an engine entraining model, the step of establishing an SSDG model, the step of diagnosing a multi-fault problem, and the step of analyzing a fault node measuring sequence. According to the multi-fault diagnosis method, the multi-source fault source searching detection can be carried out, and the fault diagnosis can be more accurate. The fault of a large system is analyzed on the background of manufacturing a large airplane, and the fault source is found out. According to the multi-fault diagnosis method based on the improved SDG, the fault diagnosis is carried out with the SDG method, the method can carry out the analysis more thoroughly compared with an event tree method and an accident tree method, the defect that according to a traditional SDG method, only the single-fault source can be found out is overcome, the multi-fault source searching can be carried out with the multi-fault diagnosis method, and the fault diagnosis is more accurate.

Description

Technical field: [0001] The invention relates to a multi-fault diagnosis method based on improved SDG, which belongs to the field of fault problem diagnosis. Background technique: [0002] Whether air transportation is safe or not directly determines the degree of people's dependence on civil aviation and the speed of development of the civil aviation industry. The civil aviation industry is an important part of the transportation industry, and its degree of development reflects the level of modernization of a country. [0003] In 2011, the Civil Aviation Administration issued the "Twelfth Five-Year Plan for the Development of Civil Aviation in China", which summarized the achievements of the Eleventh Five-Year Plan of Civil Aviation, and also proposed the guiding ideology and development goals of the Twelfth Five-Year Plan for Civil Aviation. The article pointed out that by 2015, the size of my country's fleet will reach about 2,750, with an average annual growth rate of 1...

AI Technical Summary

Problems solved by technology

[0005] In the middle and late part of the last century, the successful development of new jet airliners marked that the safety level of the world's civil aviation industry has been greatly improved. However, the structure of aircraft has become more and more complex.

Among them, aircraft engines have developed from small aircraft piston engines to civilian large passenger aircraft turbine engines; the structure of the engine has become more and more complex, resulting in engine failures that cannot be diagnosed accurately in real time

The traditional fault detection method has been unable to adapt to the detection of the complex system of the current aircraft. For this reason, scientists and scholars from all over the world have conducted a lot of research on the problem of fault diagnosis.

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