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uct), but not safety, or nonply regulation issues=============================================================9 Almost Catastrophic: Hazardous with warning (F) Involved in safety, and/or government regulation issues=============================================================10 Catastrophic: Hazardous without warning (F) Involved in safety, and/or government regulation issues=============================================================SEVERITY RATING FOR PRODUCT FMEA (A) The user will probably notice only a minor negative impact on the product參考資料 : 嚴重性評估 產(chǎn)品 ,結(jié)構(gòu)型 FMEA 31 Ranking Degree of Impacts on Function(F) or Appearance(A)=============================================================1 Improbable/ Minor: Not perceptible, not noticeable (F) The consequence will not have any perceptible impact on the performance of product (A) The user will not notice the consequence=============================================================2 3 Insignificant/ Low, Negligible: Nuisance, noticeable (F) Nuisance but likely negligible=============================================================4 5 Moderately Significant: Dissatisfaction (A F) The user will notice a negative impact as failure occurs, ., difficult to apply, difficult to use, disfort, etc. (F) Partial of the system operable at reduced performance, and gradual performance degradation=============================================================6 7 Significant/ High: Annoyance (A F) The failure causes greater annoyance on the part of user (F) Partial system function lost, but still can use it without safety concern。 28 OCCURRENCE RATING FOR PRODUCT FMEAQualitative Approach Ranking Quantitative ApproachLikehood of this happens=============================================================Remote :Situation Unlikely=============================================================Low : 2Situation relatively few 3=============================================================Moderate : 4Situation occasional occures 56=============================================================High : 7Situation repeated occures 8=============================================================Extreme : 9Almost inevitable 10=============================================================Possible failure rate through out thedesign life based on field performance onsome similar products under similarfields condition1 1 PPM 50 PPM 250 PPM % % % % % % %參考資料 : 發(fā)生度評估 產(chǎn)品 ,結(jié)構(gòu)型 FMEA 29 OCCURRENCE RATING FOR PROCESS FMEABased on SPC of related RankingSignificant variables=============================================================Remote :Situation unlikely 16 Standard Deviations Control=============================================================Almost Remote(SU) :5 Standard Deviations Control=============================================================VERY Low(SU) :4 Standard Deviations Control=============================================================Low :Situation relatively few 43 Standard Deviations Control 5=============================================================Moderate :Situation occasional occures3 Standard Deviations Control 6but occasionally out of control 7=============================================================High :Situation frequent occures 8SPC is questionable, but havesome sort of control=============================================================Very High :Situation repeated occures=============================================================Extreme :Almost inevitable=============================================================3 250 PPM 1000 PPM (%) %10 % % %Based on Actual OperationPerformance Data, or Historical Dataon Similar Variables 1 PPM2 50 PPM %9 %參考資料 : 發(fā)生度評估 流程型 FMEA 2023/2/24 30 Ranking Degree of Impacts on Function(F) or Appearance(A)=============================================================1 Improbable/ Minor: Not perceptible, not noticeab