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Establishing method for fault tree

A technology for establishing methods and fault trees, which is applied in the field of fault diagnosis, and can solve problems such as difficult engineering implementation, failure to consider the severity and frequency of fault causes, etc.

Inactive Publication Date: 2013-03-06
COMP APPL TECH INST OF CHINA NORTH IND GRP
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  • Claims
  • Application Information

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Problems solved by technology

The traditional fault tree establishment method has the following deficiencies: 1) The severity and frequency of fault causes are not considered in the process of fault tree establishment; 2) Even if the severity and frequency of fault causes are considered, the calculation process requires a mathematical model. Engineering is difficult to achieve

Method used

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  • Establishing method for fault tree

Examples

Experimental program
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Embodiment Construction

[0033] This embodiment will be as figure 1 with 2 The method for establishing the fault tree shown is applied to an electronic information system. When the electronic information system has a fault phenomenon of "no display on the computer screen", the fault tree establishment process corresponding to the fault phenomenon is as follows:

[0034] Step 1. The fault analysis unit obtains the direct causes of the fault phenomenon from the knowledge base according to the input fault phenomenon. Among them, the direct cause of the "computer screen is not displayed" in the knowledge base is the damage of the host, the screen and the wiring. The fault analysis unit expresses each direct cause obtained as the host damage R 11 , The screen is damaged R 12 And wiring damage R 13 ; Here, the fault analysis unit passes R ij Represents the reasons related to the failure phenomenon, i represents the layer number of the cause, and j represents the cause R ij The sequence number in the i-th layer ...

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Abstract

The invention discloses an establishing method for a fault tree. The establishing method comprises the following steps of: resolving fault reasons layer by layer to obtain the reason of each layer; determining a severity weight coefficient of each layer of reason; determining a frequency degree weight coefficient of each layer of reason; establishing the fault tree, wherein fault phenomena and various reasons form various components of the fault tree; arraying the various components according to the resolving relationship; arraying various reasons resolved from the same component according to the severity weight coefficient from small or large or from large to small; expressing the logical relation between each reason and next layer of reason resolved from the reason; and marking the frequency degree weight coefficient for each reason. According to the establishing method for the fault tress, which is disclosed by the invention, the severity and the weight coefficient of each fault phenomenon can be embodied while the mutual relation among various reasons causing the fault phenomena is embodied; and a complex mathematical model is not required. According to the establishing method, the fault tree can be quickly established for the fault phenomena according to the specific flow design.

Description

Technical field [0001] The invention belongs to the field of fault diagnosis, and particularly relates to a method for establishing a fault tree. Background technique [0002] Fault tree analysis is an important method for reliability, safety analysis and risk assessment of large complex systems. It is to establish a fault tree model by analyzing the hardware, software, environment, and human factors that cause product failures to determine Various possible causes of product failure. The traditional fault tree establishment method has the following shortcomings: 1) The failure cause severity and frequency are not considered in the process of fault tree establishment; 2) Even if the severity and frequency of the failure cause are considered, the calculation process requires a mathematical model. It is difficult to realize in engineering. Summary of the invention [0003] The purpose of the present invention is to address the shortcomings of the traditional fault tree building met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/46G06F11/36
Inventor 胡江钱毅赵小川查长流瞿蓉崔倩楠刘珊胡雄文赵欣欣郝丽丽于晶陈贤相左明周宏志徐英新张月李陈张敏刘莹田铮施建昌刘新广
Owner COMP APPL TECH INST OF CHINA NORTH IND GRP
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