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A Priority-Based Bottom Event Sorting Method

A sorting method and bottom event technology, applied in the direction of electrical testing/monitoring, etc., to achieve the effects of small BDD scale, shortened analysis time, and low energy consumption

Active Publication Date: 2019-11-08
HARBIN ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is in order to solve the above-mentioned problem that bottom event sorting exists in existing fault tree analysis method, has proposed a kind of bottom event sorting method based on priority

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  • A Priority-Based Bottom Event Sorting Method
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  • A Priority-Based Bottom Event Sorting Method

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Embodiment Construction

[0034] Hereinafter, the present invention will be described in more detail with examples in conjunction with the accompanying drawings:

[0035] (1) Preprocessing the fault tree:

[0036] 1) Real number coding is used for the fault tree structure, the real number coding operation speed is fast, and the coding method has the function of variable identification and variable value at the same time, easy to identify and compare; the fault tree structure coding rules are as follows:

[0037] Rule 1: The sequence numbers of logic gates are 1, 2, 3,..., N, and the sequence numbers of bottom events are: 10000, 10001, 10002, 10003,..., n, where N is less than 10,000 and n is greater than or equal to 10,000.

[0038] Rule 2: The coding rule of the gate type is that the logical AND gate is represented by the number 1, and the logical OR gate is represented by 2.

[0039] Rule 3: The composition of each row of elements is: the first is the door number; the second is all the inputs under the door, a...

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Abstract

The invention discloses a bottom event ordering method based on priority and belongs to the fault analysis technology field. The method comprises steps that a fault tree is pre-processed to acquire asimplified fault tree; bottom event ordering of the simplified fault tree is carried out, before the fault tree is converted into a BDD structure, the bottom event ordering sequence is firstly determined, and bottom event ordering is carried out through employing the bottom event ordering method based on priority; according to the acquired bottom event ordering sequence, the fault tree is converted into the BDD structure according to an If-Then-Else operator of the Shannon principle; traversal of the BDD structure is carried out, all the paths taking 1 as terminal nodes of the BDD structure are searched, and all the paths forms a cut set of the fault tree. The method is advantaged in that calculation cost is reduced through reducing the scale of the BDD, memory consumption of the fault tree analysis method is effectively reduced, and calculation efficiency is further improved.

Description

Technical field [0001] The invention relates to a priority-based bottom event sorting method, which belongs to the technical field of failure analysis. Background technique [0002] The Fault Tree Analysis (FTA) method is an effective method for reliability analysis and fault diagnosis. Fault tree models have been widely used in probabilistic safety analysis of nuclear power plants, and almost all risk analysis research and calculations rely on these models. In order to design a system that meets safety standards, such as a nuclear power plant risk monitoring system, it is necessary to grasp the safety of the system when designing, and take appropriate measures for systems that do not meet the safety requirements in time. With the development of computer technology, various control and fault-tolerant technologies are widely used, and the structure of many systems is becoming increasingly complex, showing the characteristics of dependence, redundancy, repairability, and timelines...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
Inventor 冯晓宁王卓李娜韩岚严碧君蔡绍滨曲立平潘海为孟宇龙
Owner HARBIN ENG UNIV
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