Component Fault Tree Construction via Physics of Failure Layers
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Solution Overview
Problem
Conventional Fault Tree Analysis methods fail to deeply investigate the physics of failure in components, making it difficult to describe failure mechanisms and paths, which hinders reliability design and quality analysis.
Innovation Solution
A method and system for constructing component fault trees based on physics of failure, involving the creation of a fault information database with six layers and constructing a fault tree with n levels of events, using logical relationships and simplifying the tree with common cause failure mechanisms and modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional Fault Tree Analysis methods are used, then the analysis process is simple and straightforward, but the depth of investigation into physics of failure is insufficient
Solution Approach 1:
The patent segments the fault tree analysis into six distinct layers based on physics of failure (failure mode, failure site, failure mechanism, mechanism factor, influencing factor, and degradation mechanism). This segmentation allows the analysis to delve deeper into failure mechanisms while maintaining organizational structure and manageability, resolving the contradiction between simplicity and depth.
Solution Approach 2:
The patent introduces a vertical dimension to traditional fault tree analysis by creating a six-layer hierarchical structure that adds depth to the analysis. This dimensional expansion enables investigation of physics of failure mechanisms without abandoning the systematic approach of conventional FTA, thus achieving both depth and structured simplicity.
2Measurement precision
If a detailed fault tree with six physics of failure layers is constructed, then the failure mechanism and failure path can be accurately described, but the complexity of the fault tree increases
Solution Approach 1:
The patent develops universal sub-trees for common failure mechanisms (such as fatigue, corrosion, wear) that can be applied across multiple components and systems. These standardized sub-trees reduce the overall complexity by avoiding redundant analysis while maintaining detailed failure mechanism descriptions through their reusable, multi-functional nature.
Solution Approach 2:
The patent implements a nested structure where specific component fault trees are built by integrating universal sub-trees at appropriate levels. This nesting allows detailed failure mechanism analysis within sub-trees while the overall fault tree remains manageable through modular composition, reducing complexity through hierarchical organization.
3Productivity
If universal sub-trees for common failure mechanisms are developed, then the analysis efficiency is improved, but the specificity to particular component failures may be reduced
Solution Approach 1:
The patent applies local quality by allowing customization of universal sub-trees at specific levels and positions within the fault tree. Each sub-tree can be tailored to the particular component and failure context while maintaining the standardized framework, thus preserving both analysis efficiency and component-specific precision through localized adaptation.
Data Source
AI summary
A method and system for constructing component fault tree based on physics of failure are disclosed. The method includes the steps of: establishing, based on common characteristics of component physics of failure and according to six layers based on physics of failure and category of the component, a fault information database containing information of the six layers based on physics of failure; constructing, based on the fault information database and according to the six layers based on physics of failure and logical relationship of physics of failure, a component fault tree of n levels of events of six layers based on physics of failure; and simplifying the fault tree by means of failure mechanism sub-tree transferring and fault module sub-tree importing. The method and system are applicable to construction of fault tree of various components.