SafetyandReliabilityAnalysisLecture4Yiliu LiuDepartment of Production and Quality EngineeringNorwegian Universityof ScienceandTechnologyyiliu.liu@ntnu.noNTNU- TrondheimNorwegian University ofScience and Technologywww.ntnu.edu
1 Safety and Reliability Analysis Lecture 4 Yiliu Liu Department of Production and Quality Engineering Norwegian University of Science and Technology yiliu.liu@ntnu.no
DATA ANALYSISNTNU-TrondheimNorwegian University ofScience and Technologywww.ntnu.edu
2 DATA ANALYSIS
3Test-analyze-and-fix(TAAF)Phases6-7Phases2-3Phases4-5ReliabilityGrowthtestingGrowthindesignInitial designassessment(TEST)(ANALYZE)EngineeringRedesignanalysis(FIX)(ANALYZE)NTNU-TrondheimNorwegian Universityof梦ScienceandTechnologywww.ntnu.edu
3 Test‐analyze‐and‐fix (TAAF)
Classifications of testsTheaimof reliabilitytesting is described asto give objectiveand reproducibledata on thereliabilityperformanceofanitem.AcommonclassificationisaccordingtothepurposesoftestsReliability estimation testing- to estimate reliability parameters(quantitativeacceleratedtesting)Failureidentificationtesting-to reveal failuremodes and causes (qualitative acceleratedtesting,burn-intesting,prooftesting)Reliability comparisontesting-to comparedesign optionsin termsof reliabilityandfindtheoptimal (robustdesign)Reliability compliance testing-to check whether the reliability goals or specificationshavebeenmet,ordetermineswhetherpartsorcomponentscanbeacceptable.NTNU-TrondheimNorwegian University ofScienceand Technologywww.ntnu.edu
4 Classifications of tests The aim of reliability testing is described as to give objective and reproducible data on the reliability performance of an item. A common classification is according to the purposes of tests: • Reliability estimation testing ‐ to estimate reliability parameters (quantitative accelerated testing) • Failure identification testing ‐ to reveal failure modes and causes (qualitative accelerated testing, burn‐in testing, proof testing) • Reliability comparison testing ‐ to compare design options in terms of reliability and find the optimal (robust design) • Reliability compliance testing ‐ to check whether the reliability goals or specifications have been met, or determines whether parts or components can be acceptable
5Test-analyze-and-fix(TAAF)Phases4-5ThemaintasksinaTAAFprocessinclude1.Detectproblem(i.e.,deficiencyorReliabilityGrowthtestingweakness)assessment(TEST)2.Feedbackproblemtothedesigner(ANALYZE)3.Analyzeand redesign theproductto?correcttheproblemEngineering4.IncorporateredesignintotheproductRedesignanalysis5.Verifyfixbyoperatingtheproduct(FIX)(ANALYZE)NTNU -Trondheim莎NorwegianLUniversityofScienceandTechnologywww.ntnu.edu
5 Test‐analyze‐and‐fix (TAAF) The main tasks in a TAAF process include: 1. Detect problem (i.e., deficiency or weakness) 2. Feed back problem to the designer 3. Analyze and redesign the product to correct the problem 4. Incorporate redesign into the product 5. Verify fix by operating the product