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A method for determining the safety life of an aero-engine life-limiting piece

A technology of aero-engine and safe life, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve the problems of lack of basis for selection of dispersion coefficient

Active Publication Date: 2019-06-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0012] In view of the fact that in the existing methods for determining the safety life of life-limiting parts of aero-engines, there is no basis for selecting the dispersion coefficient, and it can only rely on experience, which is usually conservative. The present invention proposes a method for determining the safety life of life-limiting parts of aero-engines. method

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  • A method for determining the safety life of an aero-engine life-limiting piece
  • A method for determining the safety life of an aero-engine life-limiting piece
  • A method for determining the safety life of an aero-engine life-limiting piece

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] The method for determining the safety life of the life-limiting parts of the aero-engine transforms the quantitative airworthiness safety requirements into constraints for determining the safety life of the life-limiting parts of the aero-engine, and establishes an inequality to obtain the maximum safe life allowed by the life-limiting parts of the aero-engine. Specific steps are as follows:

[0034] First, according to the test or field service life data, the Weibull density distribution function f(t) (shape parameter m, scale parameter η) of the life-limited parts of the aeroengine is estimated by using the maximum likelihood estimation method;

[0035] Then, from the perspective of airworthiness safety requirements, the quantitative risk requirement R of the life-limited part is obtained according to the severity level of the failure consequence of the life-l...

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Abstract

According to the method for determining the safety life of the aero-engine life-limiting piece, the quantitative airworthiness safety requirement is converted into the constraint condition for determining the safety life of the aero-engine life-limiting piece, and the allowable maximum safety life of the aero-engine life-limiting piece is obtained by establishing an inequality. The method comprises the following specific steps: firstly, estimating a Weibull density distribution function of the service life of an aero-engine life-limiting piece by adopting a maximum likelihood estimation methodaccording to test or on-site service life data; Then, from the perspective of airworthiness safety requirements, according to the failure consequence severity level of the life-limiting piece, referring to the aviation event consequence severity level and the occurrence probability division table, and obtaining the quantitative risk requirement of the life-limiting piece; And finally, proposing that the life-limiting piece should meet the condition that the average cumulative failure risk per unit time is smaller than the quantitative risk requirement before replacement, establishing an inequality, and calculating to obtain the allowable maximum safety life of the aero-engine life-limiting piece according to the inequality.

Description

[0001] Technical field: [0002] The invention relates to a method for determining the safety life of a life-limiting part of an aero-engine. [0003] Background technique: [0004] Life-limited parts, that is, life-limited parts, engine life-limited parts refer to the rotor and key stator structural parts whose failure may cause harmful engine consequences. Typical aero-engine life-limited parts include but are not limited to: discs, spacers, hubs , shafts, high-voltage casings, and non-redundant mounting components. It is stipulated in the airworthiness regulations of aeroengines that the life-limiting parts of the engine must pass the procedure approved by the authority to specify the safe life of each life-limiting part of the engine in the use limit. If the safety life of life-limited parts is specified too long, it will affect the safety of the engine, but if it is too short, it will lead to waste of life-limited parts and cause huge economic losses. At present, the saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 蔡景胡维蔡坤烨周迪鲍晗
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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