RECENT DEVELOPMENT OF PROCESS SIMULATION AND ITS APPLICATIONS TO MANUFACTURING PROCESSES

l.IntroductionThemostboortantdrivingforceinmanufacturillistoPrOduCeabetterPrOductatalowercost.GenerallyeffecthemethodsinchideshOrtenintheleadtiminthedesigncyCle,andredUcinthetoolingcostandmaChinedOWnmeatProductionst4e.AllOfthemrewtabettertmderstandingofhO…     

Calculation of Temperature Field During Laser Transformation Hardening of Cylindrical Bodies

IntroductionLaserTransformationhardeningtechniquehasbeensuccessfullyusedinindustryformanyyears.AlotsoftheoreticalworkshasbeendoneforheatflowduringthelasertfansformationhardeningofflatworkPieces["].Cyindricalbodiesarewidelyusedinindustrysuchaslocomotivecrankshaft,steelrollervalyeseat,enginecyinder.IftheschcesoftheseworkPiecesaretreatedbylasertheirwearresistancewiIIimProvealot.UptillnowmanyexPerimentalworkshasbeendoneforlasertransformationhardeningofcyindricalbodies,butfewtheoreticalworkshav…     

Stress Field Analysis of Carburized Specimen and Its Numerical Simulation

IntroductionCarburiZingiswidelyaPPiedheattre8boellttechnologyinindustry.Duringcarburizing,acasewithcarboncontellthigherthanthatofthecoreisformd;andaftethecarburzedmachinepwtbeingquenched,sdsehardenedlayeconsistedmainlyofmartensite,aswellasresidualstfOssfieldappearinit.Theresidua1stressfieldofcarburizedsteelanditsinfluenceonfatiguestrengthhavebeenstudiedexPerimenally["'],whilefewrePortscanbefoundaboatnumericalsimulationofresidualstressfieldincarburizedsPecmenaswellasitsinstataneousstressdist…     

Calculation of Transient Stress Field During Laser Transformation Hardening Process

IntroductionHighpowerCOzlaserssdsetransformationhardeningtechniquehasbeensuccessfullyusedinindusnyforWYears.BecausethetemPeratUrefleldislocalizedinmaterialdurllglasertransfonnationhMngProcess,highthermstrCsswillgenerateinmatgrialduringlasertfansformationhardeningProcess.Therisalsohighresidualstressinmaterial,bothintCnsionandcomPression['-'].ComPressresidualstressishelptoincreasethefatigueldrimeofthelasertreatedmaterial,butthetensilestresswillshortenthefatiguelifetmeofthelasertreatedmator…     

基于eM-Plant的集装箱码头交通仿真

用eM-Plant开发了一个面向对象的仿真模型,详细介绍了仿真模型中各模块的作用,模型中对象的划分方法、控制方法以及模型仿真参数的设置,并利用该模型模拟了某新建集装箱码头的生产过程,分析了其年吞吐量、岸桥利用率、交通流量等仿真数据,验证了其交通规划的合理性,用实例证明了使用eM-Plant分析、评价港口物流系统的可行性.     

AN INTERNATIONAL VIEW OF DIFFERENT APPROACHESFOR FAULTS DETECTION AND IDENTIFICATIONIN NUCLEAR POWER PLANTS

IntroductionSafe,reliable and economical operation is thegoal of any industrial process control system,particularly in nuclear power industry,wherecatastrophic events can have severe economic andsafety consequences and where even small degra-dation in plant performance can result in largereplacement power costs.After the TMI acci-dent in1 979,a large number of computer- baseddiagnostic systems have been proposed to sup-port nuclear power plant ( NPP) operators.Theearly diagnostic approaches …     

Modular design of complex product based on the triple fusion of function/feature/knowledge

The modular design technology is of importance increasingly, as product structure is more and more complex. Modular design systems face challenging problems as the design information tends to be dynamic, redundant, and very large. This paper describes a novel approach for handling them. In this approach, a partition is firstly performed for the complex structural components by mapping functions to the structures layer by layer. Based on this partition, a comprehensive design matrix is then developed to identify the key design mode which is driven by a special function. The design process is also programmed by analyzing the coupled information on both the functional and structural hierarchies. Then, the integrated knowledge model based on object-oriented method and hybrid inference method is constructed. In this model, knowledge can be organized at hierarchical classification and expressed with different forms. Finally, the methodology developed has been applied to a real application in automobile cylinder block design and the results are presented.     

Development of Thermal Process and Numerical Modeling

IntroductionWithinrecentdecade,thenumericaIsimulationhasbeenrapidlyachievedandhasaPpliedtothermalmanufacturingprocess.ThephasetransformationiscomplicatedbythefactthatthereareseveralmicrostructuralscaIestoconsideHl1-I4].InordertorevealtheruIeofcomplexphasetransformation,itisnecessarytousethetoolofnumericalsimulationtomodelandcontroltheoverallprocessofphasetransformation.NowthecomputersimulationcangetsomereasonabIeresultSinmanyaspectsofthermalmanufacturingprocess:e.g.,thesimulationoftemperat…     

Generalization of Results of Computations and Natural Experiments at Steel Parts Quenching

IntroductionThepaPerpresentsthegenera1izationofresultsofnumericalcomputationsandnaturalexperimentsbasedonthesimilaritytheoryandtheoryofregularthermalconditions.Thenumericalcomputationshasbeenmadeonthebasisofsolvingequationsofnon-stationarythermalconductivityandthermoplaSticity.Thegeneralizationofresultsliesinthefactthatwefoundadimensionlessformulaforthedeterminationofthetimeofreachingthemaximumcompressionstressesonthesurfaceofp8rtstobequenched.ThepatstobequenchedaredividedintothreegrouPs:pla…     

Finite Differential Method Simulation on Temperature Field in Process of Laser Quenching

IntroductionInfieldoflasertreatment,laserquenchofmetalmaterialsisanimportantcourse.ItisahotspotinresearchoflaserquenchtocalculatetemperaturedistributionandtosimulatethecoursebymeansofcomputerThecalculationandanalogyisnotonlyabasistoca1culateinnerstressdistributionoflaserquenching,butalsoafoundationtooptimizelaserquenchingtechnologyandtocontrolquenchingcourse.Therearemanymethodstocalculatetemperature,suchasfiniteelementmethod(FEM),finitedifferentialmethod(FDM)andsoon.Accordingtodifferentpedi…     

Research and Application Prospect of Computer Simulation on Heat Treatment Process

AseriesofgreatProgresseshavebeenachievedintheresearchofheattrCtoelltmathematicalmodelandcomPotersimulationduringrecellttenyears.ThecouPlingbforeentemPerthee-phasetransformation-stressl'-'],threedimensionalnon-linearFEManalysis[#-'],thecalculationofphasetransformationkinetics['-'],theeffectofstressonphasetransformationkineticsl,'-,,],thedealingwithabruPchangedboundnyconditionsl"#],thesimulationonfludfield["l,andotherinveshgationshavecarredout,andtheirachievementshaveProvidedasoundbasisfo…     

An Intelligent Master Model of Computer Aided Process Planning for Large Complicated Stampings

Process planning for large complicated stampings is more complicated, illegible and multiform than that for common stampings. In this paper, an intelligent master model of computer aided process planning （CAPP） for large complicated stampings has been developed based on knowledge based engineering （KBE） and feature technology. This innovative model consists of knowledge base （KB）, process control structure （PCS）, process information model （PIM）, multidisciplinary design optimization （MDO）, model link environment （MLE） and simulation engine （SE）, to realize process planning, optimization, simulation and management integrated to complete intelligent CAPP system. In this model, KBE provides knowledge base, open architecture and knowledge reuse ability to deal with the multi-domain and multi-expression of process knowledge, and forms an integrated environment. With PIM, all the knowledge consisting of objects, constraints, cxtmricncc and decision-makings is carried by object-oriented method dynamically for knowledge-reasoning. PCS makes dynamical knowledge modified and updated timely and accordingly. MLE provides scv. cral methods to make CAPP sysmm associated and integrated. SE provides a programmable mechanism to interpret simulation course and result. Meanwhile, collaborative optimization, one method of MDO, is imported to deal with the optimization distributed for multiple purposes. All these make CAPP sysmm integrated and open to other systems, such as dic design and manufacturing system.     

轮机系统图形化建模仿真支撑软件的开发

介绍了在实时仿真支撑平台上轮机系统图形化建模仿真支撑软件的开发过程以及一个应用实例.该软件利用Visual C 开发,按照面向对象及模块化思想设计,通过文件存储技术和UML技术实现软件开发,该软件具有仿真建模,模型程序自动生成和调试等功能.     

���й����ͨ���г�����ģ��ϵͳ�о�

探讨了开发城市轨道交通多列车运行模拟系统的关键问题.研制了可用于多 列车运行模拟、牵引计算、方案评价的模拟系统,该系统采用面向对象的方法和模块化的设计,具有良好的可扩展性.重点介绍了模拟系统的总体结构设计和多列车追踪运行的计算模型.此外,本文以实际线路为背景,对多列车的运行过程进行了模拟,模拟结果表明,系统可用于分析列车安全运行间隔、研究多列车运行时相互间的影响、研究不同的信号显示制式对列车运行的影响等.     

Computer Aided Simulation on Precision Cold Forging of Universal Joint Cross

IntroductionThefiwtee1emenmethod(FEM)playsanextrmelyimPortantroleintheanalysesofengineeringproblems.ForalongtimethismethodhasmainlybeenaPPliedinthelinearfieldandshownitsgreatpower.HoweveealOtofnonlinearengineeringPrOblemsWhichcanneitherbesimPlyreducedtolinearonesnorrCPresentedbylinearlyanalogywhichshallchnsethePfacticalconditionsrelativelymuch,havechallengedfiniteelementmethod(FEM).RecentymuchProgresshasbeenmadebothinthemathematicalandmechanicaltheoryandthecomPulertechnologysothatevent…     

New Computer-aided Method for Optimum Use and Properties Prediction of Steels

IntroductionInrecet[tyears,comPtwnwnericalsimulationofheattr0atthentprocesshasbecomeoneofthemostimPOhantresearchfocuses.InthispaPer,wediscussthefundameIltalsandmethodsOfthecomputetzationOfsteelandquenchingmediUmseleCtionandsizedesignforaparttObeheatdeatOd…     

风险分析计算机模拟方法论

本文给出并阐述面向投资风险分析的计算机模拟新方法。在定义风险模拟基本模型的基础上，重点对讨论对传统投资风险分析模型的修正与扩充 风险分析判据的模拟估计方法，不同投资方案的模拟比较方法以及投资风险分析的计算机图形描绘与动画模拟。本文所述方法更能接纳和描术投资风险分析产生了不确定性影响的各种随机因素，对风险的估计和推断更为细致和准确。     

The Trends and Tasks of Modeling and Simulation for Reduction of Heat Treatment Distortion

IntroductionTherearemanyfacorswhichinfluencethedistortonofworkpieceandeveryheattreatInentengineerssWandtrytofindordevelopmodelsandsimulationmethodstoestimateandreducedistortonorwarpage.VariousmodelshavebeenandbeinginvestigatOdtoestimatetheinduenceoffacorsontfansformahonkinetics,hardness,residualstressanddistOrtionarerCPortCdatmanyconferences,.HowevefHEARTS[l]andafewofothermodelshavebeendeveloPedandcontrthutingtounderstandandPredicttheialluenceofrelatngfacors[2-1o].EVenstillmanyhazardous…     

An Intelligent Response Surface Methodology for Modeling of Domain Level Constraints

An effective modeling method of domain level constraints in the constraint network for concurrent engineering （CE） was developed. The domain level constraints were analyzed and the framework of modeling of domain level constraints based on simulation and approximate technology was given. An intelligent response surface methodology （IRSM） was proposed, in which artificial intelligence technologies are introduced into the optimization process. The design of crank and connecting rod in the V6 engine as example was given to show the validity of the modeling method.     

Finite Element Simulation of Processes Involving Moving Heat Sources. Application to Welding and Surface Treatment

IntroductionAwiderangeofweldingorsurfacetreatmentprocessesinvolvetheuseofaheatsourcemovingataconstantspeedoverthesurfaceofthecomPonent.ThreedimensionalcomPutationofresidualstressesanddistortionsinducedbythiskindofprocesses,usingtheusualfiniteelementmethod,needsveryrefinedmeshesinordertocorrectlydescribethepropertiesandstressgradientsintheheataffCctCdzonealongthepathoftheheatsource.Inthispaper,wediscussthedifferentnumericalaPproaches,imPlementedinSYSWELD@software,whichcanbeusedtodorealisti…