A Fault Scenario Tree Modeling Method for Multi-state and Multi-stage Task System

Abstract

The present application provides a fault scene tree modeling method for a multi-state multi-phase task system. The method comprises the following steps: firstly, the correlation relation of the faultmechanism in the fault scene tree is studied, and the expression method of each correlation relation in the fault scene tree is proposed; Secondly, the construction method of fault scene tree of multi-state system is studied, and the time sequence scene tree and fault sequence scene tree model are established. Thirdly, the multi-phase task system is studied, and the event sequence scene tree modelof the multi-phase task system is established by analogy of the event sequence scene tree of the two-state case of the multi-phase task system. Finally, the reliability of the mechanism model and fault scene tree model is simulated by Matlab, and the simulation results of two-state system, multi-stage two-state system and multi-stage multi-state system are obtained according to the need. The fault scenario tree proposed in this application can characterize the system from three dimensions: logic, time and probability, so as to dynamically depict the whole process of system fault occurrence and development.

Description

technical field [0001] The invention belongs to the field of product reliability modeling, in particular to a fault scene tree modeling method of a multi-state and multi-stage task system. Background technique [0002] In the field of reliability engineering, multi-state and multi-stage task systems generally exist in important areas in the real world. In multi-state systems, the system itself and components can exhibit multiple performance levels (or states), and multi-stage task systems must be in accordance with Multiple non-overlapping phases or operational tasks are completed sequentially, and the sequence of events is deterministic such that if the previous phase fails, the tasks of the subsequent phase cannot be achieved. The multi-state multi-stage task system contains the characteristics of both multi-state system and multi-state task system. The complexity of the system increases the difficulty of reliability design and analysis, and also causes the problem of inac...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that most of the traditional modeling methods rely on the modeler's understanding of the system and their own experience, it is difficult to replace the program, or more special symbols are used, and it is not easy to extract fault scenarios.

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