cae技術在汽車產品開發(fā)中的應用

1、CAE技術在汽車產品開發(fā)中的應用,顧鐳博士 徐有忠博士奇瑞汽車公司奇瑞乘用車工程研究院,Outline,Vehicle Product Development ProcessChery CAE CapabilitiesSafety CAE Application,汽車新產品開發(fā)典型流程,,,,,,,,,,整車,系統,子系統,零部件,,,,,,,,,,,,,,產品/流程設計,目標分解,設計驗證,優(yōu)化,,,,,,設計,驗證/下線

2、,,System Engineering Fundamental,,車身輕量化流程圖,車身減重（863項目）,理論減重方案可減輕車身重量共計約22Kg, 目前已經完成所有需調整零件（4套）的試沖，實際減重約19Kg，三臺減重試驗車于10月12日裝配下線。(與上海交通大學合作）,奇瑞碰撞安全設計能力評估,1、CAE分析能力建設。CAE部已具備了如下能力前部碰撞：中國標準，美國法規(guī)（FMVSS 208，USNCAP，IIHS），歐洲法規(guī)（

3、ECE 94/33，EuroNCAP）側面碰撞：中國標準，美國法規(guī)（FMVSS 214，USNCAP，IIHS），歐洲法規(guī)（ECE 95，EuroNCAP）后部碰撞：美國法規(guī)（FMVSS 301），歐洲法規(guī)（ECE 32/34）車頂抗壓：美國法規(guī)（FMVSS 216）乘員保護：美國法規(guī)（FMVSS 208）2、逐步完善企業(yè)安全設計標準3、完成CAE安全分析指南,碰撞安全設計標準,前部正面碰撞安全設計標準前部偏置碰撞安全設計

4、標準側面碰撞安全設計標準后部碰撞安全設計標準,CAE is the primary tool for crash safety development and assessment CAE is used at every stage of safety design and development processCAE is essential for product cycle time reduction,Safe

5、ty CAE in Product Development,CAE在碰撞安全中的應用,,,CAE分析流程,,Frontal Impact Evaluation,Confidence Level,HIGH= Predicts trend and magnitude within the test variabilityMEDIUM= Predicts trend within 20% of testLOW = Cannot pr

6、edict trend and magnitude,Chery will continue it’s effort in safety CAE technology for,Improved safety protectionCost effective product developmentLight weight safety design for better fuel economy,Safety Challenges,Mo

7、re Stringent Safety RequirementsNew 208, IIHS Offset, IIHS Side, R/O, OOPReduce feasible solution domainIncrease of Advance Restraint SystemAdaptive Venting/Column/Load Limiter, Tether Bag, Dual Pyro, IKB, SIR, OCS….

8、.Certification complexityStyling demands shorter front endAchieve Leadership w. min. weight, cost, and time,Safety CAE Philosophy,Prediction instead of correlationModel the physics correct will ensure good prediction

9、sDesign for success instead of predict for failure (Design focus instead of Verification focus)Robustness Needs to be consideredDeliver high quality safety while meeting ABS,Safety CAE Trends,Lead Design More involve

10、ment in defining architectural and upfront targeting processCAE is not equal to FEAIntegrate all possible tools. Use the most effective tool at different stagesMore discipline CAE approaches (CAE QOS)Incorporate Opt

11、/Robustness tool setWell-round safety background Improve predicting capability,Safety Action Plan,PeopleSafety Engineering mindsetDiscipline in following CAE Quality ProcessOut-of-Box thinkingLead design mindsetPr

12、ocessSafety CAE QOSStandardized Safety Development ProcessEstablish Safety KBETechnologyResolve CAE GapsBuild Opt/Robustness Tool setsProcess Integration toolset,,Development of Safety Feature,,,brake assist,ACC,A

13、BS,ESP,traction control,active suspension,lane detection,collision mitigation (auto brake),active steer,active driver assist.,,,,,,,,,,--- Active safety feature Active safety enabler,,,V-V / V-I comm.,safety cell,,

14、safety belts,crumple zone,front bag,advanced seat belts,side impact protection,side airbag,--- Passive safety,,,,,,,,,,head restraints,safety pedals,adaptive restraints,,,compatibility,Safety potential,,,RSC,,active acc

15、identavoidance,steer by wire,blind spot,driver state,short range radar,LR radar,,Government regs/infras.,brake by wire,throttle by wire,Industry standards,sensor fusion(rdr+vis),vision system,,lane keeping assist,,,,UC

16、C/UCW,,,* Many of these technologies have significant technical hurdles; implementation cannot occur if they are not overcome.,Technology GapsStructure - 1,Rupture, Failure, separationWeld Body Mounts, Engine Mounts

17、Magnesium IP, Magnesium Radiator SupportFastenerLCAFrameFuel pipe/fuel rail/fuel tank/sender unitLatch failureOther Material - Nylon insert, foam, HoneycombWindshield Delaminating,Mechanical Behavior/KinematicsTi

18、re rotation in offsetVehicle Pitch and rotationOccupant KinematicsDoor open mechanism (inertia/intrusion)Fuel tank kinematicsVehicle kinematics during roll overSuspension/Steering kinematics,Technology GapsStructu

19、re - 2,InaccuracyBody Mounts - Inaccuracy of Body PulseThick shell performance - Frame pulseContact force predictionOther material - foam, nylon, plastic, Honeycomb Local prediction (crash zone),Technology GapsStru

20、cture - 3,Future,Combine structure and occupantBetter model of interior (IP, St. Col., KB, Belt, Bag, ….)Better prediction of angular, offset, VtVRobustness analysis - mindset changesTarget Cascading capabilityBest