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Electrical system element importance analysis method

A technology of electrical system and analysis method, applied in the field of safety system engineering, can solve problems such as complex calculation, factor projection fitting method and fuzzy structural element method, etc.

Inactive Publication Date: 2017-01-25
LIAONING TECHNICAL UNIVERSITY
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  • Application Information

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Problems solved by technology

Because this kind of data itself has ambiguity, randomness and discreteness (uncertainty), it cannot be reflected by classical fault tree analysis, even if the discrete space fault tree (Discrete Space Fault Tree, DSFT) of SFT is used to simulate the factor projection Legal and fuzzy structural element methods are also more intractable and computationally complex

Method used

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  • Electrical system element importance analysis method
  • Electrical system element importance analysis method
  • Electrical system element importance analysis method

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Embodiment Construction

[0038] Electrical system T=X 1 x 2 x 3 +X 1 x 4 +X 3 x 5 The reliability of the 5 components contained in is affected by temperature and humidity, and the failure of these components in different temperature and humidity changes are counted. Different temperature and humidity values ​​and their corresponding component reliability values ​​are brought into the inverse cloud model as data, and the reliability cloud model characteristic parameters of these components with respect to temperature and humidity are obtained. As shown in Table 1.

[0039] Table 1 Cloud model of component reliability

[0040]

[0041] with X 1 As an example, the C in Table 1 1 c (20.11,6.05,1.55) and C 1 h (44.37,5.11,0.55) into formula (2), and then into formula (5), you can get X 1 The cloud failure probability distribution of , as shown in formula (10). Similarly, we can get X 2 、X 3 、X 4 、X 5 The cloud failure probability distribution of .

[0042] ...

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Abstract

The invention discloses an electrical system element importance analysis method. The electrical system element importance analysis method is characterized in that in order to make the related concept and calculation formula in SFT convenient to apply and express indeterminacy of original failure data, the related concept in the SFT is clouded; cloudization includes the following steps of clouding element region probability importance and element region critical importance, the clouded element region importance can fully reflect fuzziness, randomness and discreteness of data, and the calculation process is more practical than an original method. The electrical system element importance analysis method can be used for researching element importance in system working environment.

Description

technical field [0001] The invention relates to safety system engineering, in particular to the determination of the importance of components in the system working environment. Background technique [0002] The fault tree theory in safety system engineering is an important part of its theoretical system. Among them, the concept of importance reflects the degree of impact of component reliability changes in the system on system reliability. The importance concepts in the fault tree include probability importance and critical importance. In the proposed Space Fault Tree (SFT), there are key importance distribution, probability importance distribution, factor importance and factor joint importance distribution, which reflect the influence of components and factors on system reliability from different aspects. influences. The first two concepts reflect the degree of change in the probability of the top event (system failure) caused by changes in the probability of basic event...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 张晨李莎莎崔铁军
Owner LIAONING TECHNICAL UNIVERSITY