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Failure mode effects and criticality analysis method adopting two RPNs

A technology of failure modes and analysis methods, applied in electrical digital data processing, special data processing applications, instruments, etc., to solve problems such as hazards and failure mode effects

Inactive Publication Date: 2013-07-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is in order to solve the above-mentioned problem that existing FMECA method exists, has proposed a kind of failure mode influence and hazard analysis method that adopts two RPN numbers

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  • Failure mode effects and criticality analysis method adopting two RPNs
  • Failure mode effects and criticality analysis method adopting two RPNs
  • Failure mode effects and criticality analysis method adopting two RPNs

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Embodiment Construction

[0030] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0031] The FMECA model proposed in this paper adds the preventive degree index into the calculation of RPN number, which means "the effectiveness of the current design improvement scheme for preventing the occurrence of this fault". Distinguishing the preventive measures of failure from the detection measures will help designers focus on the improvement and optimization of the UAV product design process. The basic idea of ​​the present invention is as figure 2 shown. From figure 2 It can be seen from the figure that the relationship between the analysis items of FMECA is as follows:

[0032] (1) There is a causal relationship between the failure cause and the failure mode, and a causal relationship between the failure mode and the failure effect;

[0033] (2) Taking the failure mode as the center, determine the failure effect and failure cause through analy...

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Abstract

The invention discloses a failure mode effects and criticality analysis method adopting two RPNs (risk priority numbers). The method particularly comprises the steps as follows: grading according to the prevention level and the detection difficulty respectively to obtain failure mode severity and occurrence quantitative indexes, namely an RPN 1 and an RPN 2, wherein the RPN 1 is O*S*P, the RPN 2 is O*S*D, P is the prevention level, O is the failure mode occurrence rank, S is the severity level, and D is the detection difficulty level; and comparing the RPN 1 with the RPN 2 according to the numerical sizes of the two RPNs to obtain failure mode sorting and selection modes. According to the method, the detection difficulty level of failure modes and the prevention level of design improvement to the failure modes are considered when the RPNs are calculated, so that the failure modes are sorted from the aspects of prevention and detection by the obtained two RPNs, the situation of neglection of design improvement due to good detection measure is avoided, and a more comprehensive basis is provided for product design improvement.

Description

technical field [0001] The invention belongs to the field of reliability optimization design of mechanical products, and specifically relates to a failure mode influence and hazard analysis method. Background technique [0002] Failure Mode, Effects and Criticality Analysis (FMECA) is a reliability analysis method that analyzes all possible failure modes of each product in the system and all possible Each failure mode is ranked by its severity and its probability of occurrence. The purpose of FMECA is to determine all possible failure modes of components, components, equipment, and software in the design and manufacturing process through systematic analysis, as well as the cause and effect of each failure mode, so as to find potential weak links and propose improvement measures. The core work of FMECA is as follows: figure 1 shown. [0003] In the process of implementing FMECA, it is very important to sort the failure modes and find out the failure modes that need to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 刘宇汪忠来黄洪钟宋巍孙锐凌丹肖宁聪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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