Importance degree calculation method for aerospace products

A calculation method and technology of importance, applied in computing, instruments, data processing applications, etc., can solve problems such as user troubles, insufficient consideration of factors, influence the rationality and accuracy of importance ranking results, etc., to achieve ranking results. reasonable effect

Inactive Publication Date: 2018-09-28
CHINA AEROSPACE STANDARDIZATION INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analyze the importance calculation methods in the standard: on the one hand, because these methods take different factors into consideration when calculating the importance, the ranking results of importance obtained by different methods may be different, which will bring problems to users. On the other hand, the importance calculation method in the standard can explain the relative importance of each event to a certain extent, but in terms of the possibility and severity of risk occurrence, the factors considered are not comprehensive enough, which affects the importance of events. The rationality and accuracy of the ranking results

Method used

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  • Importance degree calculation method for aerospace products
  • Importance degree calculation method for aerospace products
  • Importance degree calculation method for aerospace products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Embodiment 1: Calculation of Importance of Fault Tree

[0118] For the fault tree analysis, since there is only one top event, the severity has only one level, so the severity index does not need to be considered when evaluating the importance of the fault tree.

[0119] The importance degree calculation method of the present invention is illustrated with a case in GJB 768. The fault tree of importance calculation in this standard is as follows: image 3 shown.

[0120] 1) Collection of experimental data information on risk basic events

[0121] Assuming that X1, X2, X3, X4, and X5 are success or failure data, the number of failures and the total number of tests are shown in Table 2.

[0122] The reliability data of each risk basic event of table 2 embodiment 1

[0123] parameter name

X1

X2

X3

X4

X5

Number of failures

1

5

10

15

20

total number of tests

100

500

1000

1500

2000

[0124] 2) Calcul...

Embodiment 2

[0160] Example 2: Calculation of the importance of PRA

[0161] The PRA model of an aerospace system includes two parts: event sequence diagram model and fault tree model.

[0162] An event sequence diagram model such as Figure 5 As shown, there are 4 consequence states defined in the model, including 3 undesired consequence states. The definition and severity level of each consequence state are:

[0163] OK——The task is successful, which is the expected consequence state;

[0164] LOP——The system is slightly damaged, which is a state of unexpected consequences, and the severity level is "mild";

[0165] LOM——The system is severely damaged, and it is in an unexpected consequence state, and the severity level is "serious";

[0166] LOC - System crash, state of undesired consequences, severity level "catastrophic".

[0167] A fault tree model such as Figure 6-8 shown.

[0168] (1) Collection of experimental data information on risk basic events

[0169] Assuming...

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Abstract

The invention discloses an importance degree calculation method for aerospace products. The influence of the uncertainty of risk basic events is considered; the severity of consequences caused by theevents is an important dimension of risk measurement, but such factor is not considered in a standard method; in view of this situation, the importance degree calculation method is adopted. Accordingto the method of the invention, the severity of the consequences caused by the risk basic events is considered; a minimum cut set order and the number of minimum cut sets containing risk basic events,such two factors are included in the importance degree analysis of the method of the present invention; the consistency of importance degree evaluation indexes is realized, a structural importance degree is taken as a parameter of the importance degree of the method of the present invention; order elimination adopts the ratios of current factor values to maximum values as factor values, so that the maximum value of each factor obtained after parameters are subjected to order-elimination is 1 assuredly. Compared with a normalization method, the order elimination method of the invention is notaffected by the number of the risk basic events. The importance degree calculation method is provided according to the characteristics of an FTA model and a PRA model, and therefore, the method of theinvention can be applied to the FTA and the PRA.

Description

technical field [0001] The invention belongs to the technical field of aerospace risk analysis and evaluation, and in particular relates to an importance calculation method for aerospace products. Background technique [0002] Importance has been widely used in fault tree analysis (FTA) and probabilistic risk assessment (PRA) technology, mainly used to describe the importance of each event, importance calculation and ranking can provide valuable information for system design and fault analysis Information. [0003] In GB / T 29075-2012 "Spacecraft Probabilistic Risk Assessment Procedure" and GJB 768A-1998 "Guidelines for Fault Tree Analysis", various calculation methods of importance are introduced, including: structural importance, probability importance, relative probability importance These methods are mainly calculated from the perspective of risk (that is, the severity of the impact of an event on the system and the probability of the event itself). to measure the impor...

Claims

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Application Information

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IPC IPC(8): G06Q10/06
CPCG06Q10/0635G06Q10/06393
Inventor 李健沈岭刘金燕赵子覃赵礼兵
Owner CHINA AEROSPACE STANDARDIZATION INST
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