监测、管理及降低列车纵向力

介绍了澳大利亚力拓公司利用全自动监测车对长大编组列车干线运行工况和翻车机作业工况进行监测的情况。研究结果表明,翻车机作业中的拉伸力导致的疲劳损伤是干线运行中拉伸力导致的疲劳损伤的3倍左右,而干线运行中的压缩力造成的疲劳损伤是翻车机拨车作业工况中压缩力造成的疲劳损伤的3倍左右。     

RECENT DEVELOPMENT OF PROCESS SIMULATION AND ITS APPLICATIONS TO MANUFACTURING PROCESSES

l.IntroductionThemostboortantdrivingforceinmanufacturillistoPrOduCeabetterPrOductatalowercost.GenerallyeffecthemethodsinchideshOrtenintheleadtiminthedesigncyCle,andredUcinthetoolingcostandmaChinedOWnmeatProductionst4e.AllOfthemrewtabettertmderstandingofhO…     

Computer Simulation of Thermal-Mechanical Processing

AlterationIntroductionThereisastrongini6ractionamongtemPetalrefield,strCssfield,andmicrosttuctutulaltOrationinm8terialsduringtheirhotworking[l'2].Especiallyduringthecoolingprocess,inwhichtemPeratorechangnsgreatly,intendionsbecomemorecomplexbecauseoftransformationoccurmnce.Duringthehotdeformation,thingswillaPpearsuchas:a.hotdeformation,relatedtostressfieId,changesessentiallytheshaPeofmaterialsandcausesthevariationofthecontactstatebetWeenthedieandsample,resultinginchangeofthethermalboundnyco…     

A Numerical Model for Multiple Phase Transformations in Steels during Thermal Processes

IntroductionltiswellknownthatmetallmpicalstrUcforeofsteelsandheattransferarefullycouPled.PhasechangesdependontemPertheeevoluton,whereastemPertheeisinfluencedbycontrastsofmaterialcharacteristicsbetWeenphasesandlatenheateffects.AlotofworkhasbeenpefformedonthssubeCt,andclassicalmodelsarenowwidelyimPlementedintofiniteelementcomPutercodes[l][2][31[4][5][61.Thesemodelsaregenerallybasedonf.AVramityPekinetics[7][8]l9]Whnthephasechangeisgovernedbydiffusion,.TheKoistinen-Marburgerlaw[l0]fOrmfornsi…     

Calculation of Transient Stress Field During Laser Transformation Hardening Process

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

Development of Thermal Process and Numerical Modeling

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

THE ANALYSIS OF CHILD′S GROWTH TREND DURING 1958～1995 IN XI′AN CITY

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PORT OF SEATTLE STATEMENT REGARDING 21ST CENTURY

It is impossible to overstate the importance of the World Wide Web to any business, including ports, and there will come a day in the not-too-distant future when all internal and external processes involving the Port of Seattle will be Web-based. We see nothing but growth in the continued application of the Web to our everyday business. The Port has launched a five-year eBusiness strategy to help maintain our position as an innovative leader among ports. There are virtually no     

高速柴油机的制造

本文简要地介绍了 Davey Paxman公司的柴油机制造工艺及程序。对于一种系列的柴油机,其部件制造的互换主要原则是:采用有专用机床的流水作业线或可以生产相同的主要