Method for obtaining reliability sensitivity of anti-icing air bleeding system under temperature fault

A technology of bleed air system and system temperature, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as unavailability of design solutions and reduced safety performance

Active Publication Date: 2014-07-23
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

Traditional deterministic system optimization design cannot take into account the randomness of structural physical parameters and geometric dimensions. The resulting design points may put the structure on the verge of failure, and small fluctuations in input parameters may cause the entire design to be unavailable, greatly reducing safety. performance

Method used

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  • Method for obtaining reliability sensitivity of anti-icing air bleeding system under temperature fault
  • Method for obtaining reliability sensitivity of anti-icing air bleeding system under temperature fault
  • Method for obtaining reliability sensitivity of anti-icing air bleeding system under temperature fault

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Embodiment Construction

[0032] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0033] The aircraft anti-icing bleed air system uses the compressed air of the engine compressor and adjusts it, and then supplies the anti-icing chamber system for anti-icing. The schematic diagram of the principle is shown in figure 2 As shown, it is composed of check valve, high-pressure valve, bleed air regulator, high-pressure regulator, pressure regulation and shut-off valve, overheat switch, precooler, sensor, and anti-icing chamber. Due to the random uncertainty and dispersion of the parameters of the anti-icing bleed air system, the outlet temperature T(x) is also a random variable. If the outlet response T(x) of the aircraft anti-icing bleed air system deviates from the predetermined design range, the system will fail, which will affect the safe flight of the aircraft in icing environments.

[0034] Step 1: Use limited experiments to obtain system par...

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Abstract

The invention relates to a method for obtaining the reliability sensitivity of an anti-icing air bleeding system under a temperature fault. Input parameters of the system and the random uncertainty of the system parameters are processed through a system parameter probability model, a function expression between system output responses and the system parameters is fitted with a response surface method, and influences of the uncertainty of the system parameters on the system reliability are reduced; according to a subset simulation reliability analysis method, the accuracy requirement can be met with the small sampling time number, the dispersion degree is small, and the convergence speed is high; the influence degree of the system parameters on the overall reliability of the system is calculated and obtained with a reliability sensitivity analysis method, and the direction is provided for determining the optimal solution of system reliability optimization design.

Description

technical field [0001] The invention relates to a method for obtaining reliability sensitivity under temperature failure of an anti-icing bleed air system, which is mainly used for quantitatively evaluating the reliability of an anti-icing bleed air system of an aircraft and providing guidance for reliability optimization design. Background technique [0002] In actual engineering, various parameters involved in system design are sometimes deterministic, and more often they are uncertain. Due to the wide existence of uncertain factors, it has a great impact on the system analysis results, especially for systems with complex systems and harsh working environments. Reliability is introduced into the safety analysis and design of products. The parameters involved in the design are regarded as random variables, and the influence of random factors on reliability is considered. It is the deepening and development of conventional design theory, and has gradually become A very impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张峰刘永寿南华何新党刘伟岳珠峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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