Method And System For Constructing Component Fault Tree Based On Physics Of Failure

• US 20150193290A1
• Filed: 10/29/2013
• Published: 07/09/2015
• Est. Priority Date: 12/11/2012
• Status: Active Grant

• Current Assignee: Fifth Electronics Research Institute of Ministry of Industry and Information Technology
• Original Assignee: Fifth Electronics Research Institute of Ministry of Industry and Information Technology
• Inventors: He, Xiaoqi, Chen, Yuan, En, Yunfei, Wang, Yunhui, Song, Fangfang, Feng, Jingdong
• Granted Patent: US 9,430,315 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G05B 23/0248 Causal models, e.g. fault tree; digraphs; qualitative physics
• CPC Class Codes: G05B 23/0278 Qualitative, e.g. if-then rules; Fuzzy logic; Lookup tables; Symptomatic search; FMEA
• CPC Class Codes: G06F 11/079 Root cause analysis, i.e. error or fault diagnosis in a hardware test environment G06F11/22; in a software test environment G06F11/36

Abstract

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.

Claims

1. A method for constructing component fault tree based on physics of failure, comprising:

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, wherein n is greater than or equal to 6; and

simplifying the fault tree by means of failure mechanism sub-tree transferring and fault module sub-tree importing.

2. The method of claim 1, wherein the step of establishing a fault information database further comprises:

determining, based on the common physical characteristics of component physics of failure, six information layers based on physics of failure, namely;

information layer of fault mode, information layer of failure mode, information layer of failure site, information layer of failure mechanism, information layer of mechanism factor, and information layer of influencing factor; and

classifying and organizing failure cases and failure information, and establishing, according to the six layers based on physics of failure, fault information database of the six layers based on physics of failure.

3. The method of claim 1, wherein the step of constructing component fault tree further comprises:

determining, based on the fault information database, six layers of events of the fault tree, namely;

fault mode, failure mode, failure site, failure mechanism, mechanism factor, and influencing factor; and

determining, according to the causality of the process of physics of failure, logic gates between events of component fault tree, and constructing a component fault tree of n levels of events of six layers based on physics of failure.

4. The method of claim 1, wherein the step of simplifying the fault tree further comprises:

establishing component common cause failure mechanism sub-tree set and common cause failure module sub-tree set;

the sub-tree set of component common cause failure mechanism and the sub-tree set of common cause failure module represent, respectively, a sub-tree set of failure mechanism under the influence of same event and a sub-tree set of failure module under the influence of same event; and

simplifying the component fault tree by transferring common cause mechanism sub-tree and importing common cause failure module sub-tree into the component fault tree.

5. A system for constructing component fault tree based on physics of failure, comprising:

a fault information database establishing module, configured to establish, 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 component fault information database containing information of six layers based on physics of failure;

a fault tree constructing module, configured to construct, 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

a fault tree simplifying module, configured to simplify the fault tree by means of common cause failure mechanism sub-tree transferring and common cause fault module sub-tree importing.

6. The system of claim 5, wherein the fault information database establishing module is further configured to determine, based on the common physical characteristics of component physics of failure, six information layers based on physics of failure, namely:

information layer of fault mode, information layer of failure mode, information layer of failure site, information layer of failure mechanism, information layer of mechanism factor, and information layer of influencing factor; and

to classify and organize failure cases and failure information to establish, according to six layers based on physics of failure, fault information database of the six layers based on physics of failure.

7. The system of claim 5, wherein the fault tree constructing module is further configured to determine, based on the fault information database, six layers of events of the fault tree, namely:

fault mode, failure mode, failure site, failure mechanism, mechanism factor, and influencing factor; and

to determine, according to the causality of the process of physics of failure, logic gates between events in the component fault tree, and to construct component fault tree of n levels of events of six layers based on physics of failure.

8. The system of claim 5, wherein the fault tree simplifying module is further configured to establish component common cause failure mechanism sub-tree set and common cause failure module sub-tree set;

the sub-tree set of component common cause failure mechanism and the sub-tree set of common cause failure module represent, respectively, a sub-tree set of failure mechanism under the influence of same event and a sub-tree set of failure module under the influence of same event; and

to simplify the component fault tree by transferring common cause mechanism sub-tree and importing common cause failure module sub-tree into the component fault tree.