Software FMEA Method Based on Hierarchical Dependency Modeling

Abstract

The invention discloses a software FMEA method based on hierarchical dependency modeling, including the first step, proceeding from the requirements, comprehensively and deeply understanding the analyzed object, and determining the analysis target; the second step, taking the outline design as a reference, constructing the system The third step is to select the module to be analyzed and determine its failure mode, analyze the reachability nodes of the system-level dependency model, analyze the propagation path of failure effect and the path of failure cause tracking, and determine the cause of failure and the effect of failure. Propose improvement measures; the fourth step is to select the detailed level FMEA analysis object according to the system level FMEA results; the fifth step is to build a detailed level dependency model based on the detailed design or pseudo code of the selected analysis object; the sixth step is to According to the detailed level dependence model, select the key variable to be analyzed; the seventh step is to determine the specific failure mode of the variable to be analyzed, analyze the accessibility node of the detailed level dependence model, analyze the cause of the variable and the failure effect, and propose improvement measures .

Description

technical field [0001] The invention relates to the field of software failure mode and effect analysis (FMEA) in software reliability engineering, and specifically refers to a method for effectively, conveniently and automatically performing software FMEA based on hierarchical dependency model modeling. Background technique [0002] Software FMEA is one of the effective ways to realize software reliability growth and evaluate software reliability. Software FMEA is divided into system-level software FMEA and detailed-level software FMEA. The system-level mainly adopts the method of hierarchical diagram, and the detailed-level adopts the method of variable clues. [0003] The traditional hierarchical diagram-based method determines the analysis level and analysis objects of the system according to the function and structure level of the software system, such as functional modules, software components or units, etc. Traditional system-level software FMEA often relies purely on...

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Problems solved by technology

[0006] In order to solve the problems faced by the embedded software FMEA, such as unclear levels, difficult to express paths, poor objectivity of analysis methods, and weak computer aids, the present invention aims at structurally developed safety-critical software and combines the characteristics of FMEA itself to construct a hierarchical dependency model , so that the FMEA failure impact analysis and cause analysis can be transformed into the node accessibility problem of the hierarchical dependence model, which provides a theoretical method for the objective analysis and automatic analysis of the software FMEA

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