回复3#feellee20100701
sorry,只能给一些思路和引用的出处,具体的方法,还是有保密要求的,
DFMEA分析方法标准来源:
MILITARYHANDBOOKELECTRONICRELIABILITYDESIGNHANDBOOK
MIL-HDBK-338BP448
αij=failuremodefrequencyratioofitemiforthefailuremodej(seeTable
7.8-1foranexample),i.e.,theratiooffailuresofthetypebeingconsideredto
allfailuresoftheitem.
βij=lossprobabilityofitemiforfailuremodej(i.e.,theprobabilityofsystem
failureiftheitemfails).AsuggestedscaleisCertainLoss=1.00,Probable
Lossrangesfrom0.1to1.0,PossibleLossrangesfrom0to0.10,NoEffect-
0.0
λi=failurerateofitemi
(CR)ij=systemfailurerateduetoitemi’sfailinginitsmodej
CR=failuremodefrequencyratio(αij)*lossprobability(βij)*failurerate(λi)
另也可参考:MIL_STD_1629APage31~Page34 |