A Method of Extended Testability Modeling Based on Fault Injection System
Presently,the slowly development of DFT is mainly due to the la ck of effective testability validation.The validation is an i mportant part of the DFT; it will accurately detect equipment Fault Detection Rate (FDR),Fault Isolation Rate (FIR),Fault Alarm Rate (FAR)and make sure other important indicators of the test.Fault injection techniques have become the core of the DFT validation.It directly introduces faults (hardware or soft ware) into the target equipment systems by m eans of artificial.Thereby it reduces the failure of the incubation period,and accelerates the pro cess of system failure.Testab ility-modeling is an effective method if fault injection.The existing methods for testability-modeling have som e constraints,including the consistency of failure criterion,fa ilure transmitting and logical-value criterion of tes t.Aiming at states differences of on-offmulti-s tate system,the method of extended testab ility modeling was proposed.Failure,test,D matrix and diagnostic tree were defined extended with the introduction of states,and an extended testability model was de fined also.The algorithms for extended testability modeling and analysis were described,which incl ude modeling,generations of extended D matrix and extended diagnostic tree.A hydraulic control system is taken as an example for the engineering application,which shows that this method is feasible and effective.
Fault injection testability modeling on-off multi-state system extended D matrix extended diagnostic tree
Li Zhiyu Huang Kaoli Lian Guangyao
Ordnance Engineering College,Shi Jiazhuang,China Ordnance Technology School,Shi Jiazhuang,China
国际会议
沈阳
英文
2151-2154
2012-09-26（万方平台首次上网日期，不代表论文的发表时间）