Multi-fault diagnosis method based on improved SDG

A diagnostic method and multi-fault technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as complex engine structure, complexity, and inability to adapt to detection

Inactive Publication Date: 2014-09-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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 engin...

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  • Multi-fault diagnosis method based on improved SDG
  • Multi-fault diagnosis method based on improved SDG
  • Multi-fault diagnosis method based on improved SDG

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Embodiment Construction

[0065] Please refer to Figure 1 to Figure 13 As shown, in the multi-fault diagnosis method based on the improved SDG, the present invention introduces the basic definition of the SDG model, and expands and optimizes the basic definition; whether the establishment of the SDG model is reasonable, and whether it reflects the internal actual working principle of the engine bleed air system is directly related to The detailed calculation of the later system diagram and the accuracy of the conclusion.

[0066] Define node values ​​and relationship values ​​between nodes as follows:

[0067]

[0068] X represents the node value, X|D represents the expected value of the node, and ε represents the value range of the normal node.

[0069] D = φ ( v m → v ...

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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...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 刘君强王小磊杨贤儒左洪福张马兰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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