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Method for assessing reliability of aircraft landing gear control system under small samples and poor information

An aircraft landing gear and reliability technology, applied in informatics, special data processing applications, instruments, etc., can solve problems such as enlargement or reduction of solution intervals, high data volume requirements, etc., and achieve the effect of accurate reliability evaluation

Active Publication Date: 2016-07-13
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

[0007] Overcome the problem that the stochastic model requires a high amount of data, and the interval model is enlarged or reduced due to different operation orders, so as to achieve a more accurate reliability evaluation of the landing gear retraction system under small samples and poor information

Method used

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  • Method for assessing reliability of aircraft landing gear control system under small samples and poor information
  • Method for assessing reliability of aircraft landing gear control system under small samples and poor information
  • Method for assessing reliability of aircraft landing gear control system under small samples and poor information

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Embodiment Construction

[0026] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0027] According to the working principle, composition structure and fault classification of the landing gear retraction system, a system fault tree is constructed, such as figure 1 shown;

[0028] As shown in Table 1, the failure probability intervals of each bottom event of the landing gear retraction system fault tree are given as follows:

[0029] Table 1 The failure probability interval of the failure tree bottom event of the landing gear retraction system

[0030]

[0031] Let "*", *∈{+,-,·, / } denote a real binary operation on the set of real numbers. to any Define the binary operations on the interval number set I(R) as follows:

[0032] [x]*[y]={z|z=x*y, x ∈ [x], y ∈ [y]} (1)

[0033] Then there are the following four algorithms:

[0034] [ x ]...

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Abstract

The invention relates to a method for assessing reliability of an aircraft landing gear control system under small samples and poor information. The method comprises the steps of establishing an aircraft landing gear control system failure tree according to the system principles and the failure mechanism, converting the form of a failure probability interval of each bottom event of the aircraft landing gear control system failure tree into the pangrey number expression form based on the interval and pangrey conversion rules, establishing aircraft landing gear buffer system failure transfer functions from the bottom events to top events according to the logic relation among layers of the failure tree, and calculating the aircraft landing gear buffer system failure transfer functions through pangrey four operation rules, so that the top event failure probability pangrey form is obtained; converting the top event failure probability pangrey form into the interval form based on the interval and pangrey conversion rules, so that an aircraft landing gear buffer system failure probability range based on the pangrey algorithm is obtained; according to the aircraft landing gear buffer system failure probability range, conducting reliability assessment on failure.

Description

technical field [0001] The invention relates to the reliability analysis of the aircraft landing gear retraction system under small sample and poor information, and performs system fault tree analysis based on the graying algorithm to obtain more accurate reliability of the system, thereby evaluating the safety degree of the system. Background technique [0002] In recent years, the technology used in various large and complex systems has become more and more advanced, its internal structure has become more and more complex, and the degree of automation has become higher and higher, so people have paid more and more attention to the safety and reliability of system operation. As the take-off and landing device of the aircraft, the landing gear is mainly used for the take-off, landing, ground taxiing and ground parking of the aircraft. In order to reduce flight resistance, the landing gear of modern aircraft is usually retractable, and the function of the landing gear retract...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 张峰张雷雷邓维维黄震敖良波岳珠峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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