《船舶安全与可靠性理论》课程授课教案（英文讲义）Safety and Reliability Analysis Lecture 1/5

SafetyandReliabilityAnalysisLecture1Yiliu LiuDepartment of Production and Quality EngineeringNorwegian Universityof ScienceandTechnologyyiliu.liu@ntnu.noNTNU- TrondheimNorwegian University ofScience and Technologywww.ntnu.edu

1 Safety and Reliability Analysis Lecture 1 Yiliu Liu Department of Production and Quality Engineering Norwegian University of Science and Technology yiliu.liu@ntnu.no

2RAMSgroupRAMS (Reliability,Availability,MaintainabilityandSafety)group is in the department of production ofquality engineering.DOur aims:To be recognized as an internationally leadingresearchgroup on selected topics withintheRAMSareaandtoofferworld-classeducationinRAMS.Mainresearchtopics:SystemsreliabilityanalysisMaintenancemanagementandplanningRiskassessmentNTNU-TrondheimNorwegian Lniversity ofScience and Technologywww.ntnu.edu

2 RAMS group RAMS (Reliability, Availability, Maintainability and Safety) group is in the department of production of quality engineering. Our aims: To be recognized as an internationally leading research group on selected topics within the RAMS area, and to offer world‐class education in RAMS. Main research topics: • Systems reliability analysis • Maintenance management and planning • Risk assessment

3Who are we?AssociateAssociateProfessorProfessorAssociateProfessorProfessorprofessorprofessorAntoineAnneBarrosprofessorMaryAnnJornVatnPerSchjolbergNicolaRauzy(DNV-GLYiliu LiuLundteigen(head ofPaltrinierifunded)depart)Additional:PostdocHyungjuKimPostdocHaiCanhVuScient.ass Andreas MarhaugProfessorAdjunctprofessorProfessorSteinBjornAxelGranMarvinHaugenPhDstudents（10+）(Safetecfunded)Rausand(associatedMasterstudents(25+/-)(emeritus)member)www.ntnu.edu

3 Who are we? Professor Mary Ann Lundteigen Professor Anne Barros (DNV‐GL funded) Professor Marvin Rausand (emeritus) Associate professor Per Schjølberg Professor Jørn Vatn (head of depart) Associate professor Yiliu Liu Additional: • Postdoc Hyungju Kim • Postdoc Hai Canh Vu • Scient.ass Andreas Marhaug • PhD students (10+) • Master students (25+/-) Professor Stein Haugen (associated member) Professor Antoine Rauzy Adjunct professor Bjørn Axel Gran (Safetec funded) Associate professor Nicola Paltrinieri

RAMSmastercourseSchedule7,5 stp7,5 stp7,5 stpSemester7,5 stp2ndTPK4950Master thesisSpringTBA4320Traffic safety and riskevaluationTMR 4260 Safeoperation andTPK 5170maintenanceTPK 45502ndRAMS assessmentTEP4223LifeSpeciali zation projectAutumnfor criticalsystemscycle assessmentTTM 4158Dependability andperformancedesignSelect 1 from 4TMA 4275Lifetime analysisTMA 4255 AppliedstatisticsTI@ 4205 MethodsTPK5165TPK51501stand tools in safetyExpert in TeamRAMS engineeringApplied RAMSSpringpracticeand managementmodelingTPG 4200 SubseaproductionsystemsSelect 1 from 4TPK4140TPK4120TPK 51151stTPK 5160Safety andRiskmanagementMaintenanceAutumnRisk analysisreliability analysisinprojectsmanagementNTNU- TrondheimNorwegianUniversityofStart hereScienceandTechnologywww.ntnu.edu

4 RAMS master course Schedule Semester 1st Autumn 1st Spring 2nd Autumn 2nd Spring TPK 4120 Safety and reliability analysis TPK 5160 Risk analysis TPK 5115 Risk management in projects TPK 4140 Maintenance management Expert in Team TPK 5165 RAMS engineering and management TPK 5150 Applied RAMS modeling TMA 4275 Lifetime analysis TMA 4255 Applied statistics TIØ 4205 Methods and tools in safety practice TPG 4200 Subsea production systems Select 1 from 4 TBA 4320 Traffic safety and risk evaluation TMR 4260 Safe operation and maintenance TEP 4223 Life cycle assessment TTM 4158 Dependability and performance design Select 1 from 4 TPK 5170 RAMS assessment for critical systems TPK 4550 Specialization project TPK 4950 Master thesis 7,5 stp 7,5 stp 7,5 stp 7,5 stp Start here

CONCEPTSNTNU- TrondheimNorwegian University ofScience and Technologywww.ntnu.edu

5 CONCEPTS

R:ReliabilityTheabilityofan itemtoperformarequiredfunction,undergivenenviromentalandoperationalconditionsandforastatedperiodoftime-lEC60050.Function oftimeFunctionofoperatingconditionWhenlookingforward(i.e.,intothefuture),theterm"reliability"without anyadditionispreferred."Based onanalyses,mynew carwill haveaveryhigh reliability”When talking about theexperienced reliability (i.e.,what happened in thepast),theterm"reliabilityperformance"maybepreferred.e.g."Mypreviouscar hadaverygoodreliabilityperformance-withvirtuallynofailures"NTNU-TrondheimNorwegian University ofScienceandTechnologywww.ntnu.edu

6 R: Reliability The ability of an item to perform a required function, under given enviromental and operational conditions and for a stated period of time‐IEC 60050. • Function of time • Function of operating condition • When looking forward (i.e., into the future), the term “reliability” without any addition is preferred. “Based on analyses, my new car will have a very high reliability” • When talking about the experienced reliability (i.e., what happened in the past), the term “reliability performance” maybe preferred. e.g. “My previous car had a very good reliability performance – with virtually no failures

Reliability vs.QualityQuality:Thetotalityoffeaturesand charactersticsof aproductorservicethat bearon itsabilitytosatisfystatedorimpliedneeds.-ISo8402QualitydenotestheconformitytospecificationsProductreliabilitycanberegardedasanextensionof qualityintothetimedomainNTNU-TrondheimNorwegian University ofScience and Technologywww.ntnu.edu

7 Reliability vs. Quality Quality: The totality of features and characterstics of a product or service that bear on its ability to satisfy stated or implied needs. – ISO 8402 • Quality denotes the conformity to specifications. • Product reliability can be regarded as an extension of quality into the time domain

8DifferentapproachesHardwarereliability-withtwoapproaches:Structural reliabilityAlsocalledthephyisicalapproachBased ontheassessment of loads and stressesMainlyapplicabletostruturalelementsSystem reliabilityAlsocalledtheactuarialapproachBased on the study of the time-to-failure of single componentsMainlyapplicabletocomponentsandsystemsSoftwarereliabilityHuman reliabilityNTNU-TrondheimNorwegian University ofScience and Technologywww.ntnu.edu

8 Different approaches Hardware reliability – with two approaches: • Structural reliability – Also called the phyisical approach – Based on the assessment of loads and stresses – Mainly applicable to strutural elements • System reliability – Also called the actuarial approach – Based on the study of the time‐to‐failure of single components – Mainly applicable to components and systems Software reliability Human reliability

0PhysicalapproachLoad distributionamqeqoud--TheitemwillfailwhenS L)StressNTNU - Trondheim莎Norwegian UniversityofScienceandTechnologywww.ntnu.edu

9 Physical approach The item will fail when S ൏ L The reliability of the item is defined as ܴ ൌ Pr ሺܵ ൐ ܮሻ

10Physical approachStrength distributionLoad distributiopLoad distributiorCStrensth distribolRegion offailuresStressStresTwowaysofdesignforreliabilityNTNU-Trondheim莎Norwegian UniversityofScienceand Technologywww.ntnu.edu

10 Physical approach Two ways of design for reliability