A Method of Modeling the Fault Behavior of Multi-stage Task System Based on Petri Net

Abstract

The invention provides a fault behavior modeling method of a multi-phased task system based on a Petri network. The method comprises following steps: step 1, analyzing and clarifying all task phases needed to be finished in the multi-phased task system; step 2, determining system configurations, system functions and fault criteria of the all task phases and, respectively creating system reliability models of the all task phases; step 3, making FMMEA analyses of the system and all components and parts of the system according to stress and environmental conditions of all the phases and determining main failure mechanisms and correlativities of the components and parts in the system; step 4, creating a single-task-phase Petri net model based on system configurations of all the task phases; step 5, creating a correlated multi-phased Petri net model based on a failure mechanism under multiple phases of tasks as for all the components and parts of the system; step 6, comprehensively taking the Petri net models obtained by the step 4 and the step 5 into consideration, carrying out emulation solution and obtaining reliability curves of all the components and parts or the system.

Description

technical field [0001] The invention belongs to the field of product reliability modeling, in particular to a Petri net-based multi-stage task system failure behavior modeling method. Background technique [0002] A multi-stage task system refers to a system that completes tasks composed of multiple non-overlapping, continuous stages. The system needs to complete a specific task in each stage, and the success of each stage task is necessary for the success of the entire task. condition. The mission process of many equipment or systems in aviation, aerospace, and transportation fields is multi-stage. For example, when an aircraft performs a flight mission, it can be divided into different stages such as ground idle, take-off, climb, cruise, landing, and landing. Then, the aircraft performing the mission belongs to a multi-stage mission system. Compared with single-stage mission systems, multi-stage mission systems have many special properties, among which the system or its ...

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Problems solved by technology

[0007] Aiming at the shortcomings of the traditional multi-stage task system reliability modeling method, which is too dependent on statistical data, and the collection of relevant data is very difficult, and ignores the correlation between each stage of the task, the present invention proposes a method that considers the failure mechanism and its A New Method of Modeling Fault Behavior Based on Correlation

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