VehicleStructure Reliability6.1.1 Basic Concepts(4) Maintenance, maintainability>Maintenancedefinesthesetofactionsperformedonthe itemto retain it in or to restore it to a specified statePreventive maintenance预防性（或常规）维修MaintainabilityCorrectivemaintenance更正性（或非常规）维修11
Vehicle Structure Reliability 6.1.1 Basic Concepts (4) Maintenance, maintainability 11 ➢ Maintenance defines the set of actions performed on the item to retain it in or to restore it to a specified state. Maintainability Preventive maintenance 预防性（或常规）维修 Corrective maintenance 更正性（或非常规）维修
Vehicle Structure Reliability6.1.2 Historical development>Approximatedistribution of theeffortbetween qualityassuranceandreliabilityengineeringforcomplex equipmentandsystemswithhighqualityand reliabilityrequirementsRelative effort[%]100System engineering(part)Reliability(RAMS)Faultcauses/modes/engineeringeffects/mechanismsanalysis75Reliability(RAMS)analysis50Software qualityQuality assurance25Configuration managementQualitytesting,qualitycontrol,qualitydatereportingsystem0Year199Q2195019702010
Vehicle Structure Reliability 6.1.2 Historical development 12 ➢ Approximate distribution of the effort between quality assurance and reliability engineering for complex equipment and systems with high quality and reliability requirements
Vehicle Structure ReliabilityWords and ExpressionsWordsMeaningmissionn.任务adj.不可修复的nonrepairableentityn.实体time dependent时变；与时间有关的adj.瞬时的transientn. 症状symptomn.蠕变creepintrinsicadj.本质的；固有的extrinsicadj.外在的；非固有的adj.确定性的deterministic浴盆曲线bathtub curveredundantadj.穴余的13
Vehicle Structure Reliability Words and Expressions Words Meaning mission n. 任务 nonrepairable adj. 不可修复的 entity n. 实体 time dependent 时变；与时间有关的 transient adj. 瞬时的 symptom n. 症状 creep n. 蠕变 intrinsic adj. 本质的；固有的 extrinsic adj. 外在的；非固有的 deterministic adj. 确定性的 bathtub curve 浴盆曲线 redundant adj. 冗余的 13
Vehicle Structure ReliabilityQuestionsforDiscussion1. What is the difference between the quality targetsbefore and after the 1860s?2. How to classify failures?3. Give an example of one product which obeyedbathtub curve.4.WhatisthedifferencebetweenMTTFandMTBF?14
Vehicle Structure Reliability Questions for Discussion 1. What is the difference between the quality targets before and after the 1860s? 2. How to classify failures? 3. Give an example of one product which obeyed bathtub curve. 4. What is the difference between MTTF and MTBF? 14
PARTTWOVehicleSystemDynamicsand Control车辆系统动力学与控制15
PART TWO Vehicle System Dynamics and Control 车辆系统动力学与控制 15