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1、英文文献MoulddesignOVERVIEWWhilediscussingthedifferencesamongengineers,scientists,andmathematiciansinChapter1,wesawthatthewordengineeringisrelatedtobothingeniousanddevise・Creativedesignliesatthecenterofthemechanicalengineeringprofession,andanengineer'sultimategoalistoproducenewhardwarethatsolvesoneofso
2、ciety'stechnicalproblems.Beginningeitherfromablanksheetofpaperorfromexistinghardwarethatisbeingmodified,theproductdevelopmentprocessoftenformsthefocusofanengineer'sactivities.Inkeepingwiththeirprofession'stitle,manyengineerstrulyareingenious,andtheypossessthevisionandskilltomakesuchlastingcontribut
3、ionsasthosedescribedinthetoptenlistofSection1.3Formaleducationinengineeringisnotaprerequisitetohavingagoodforaneworimprovedproduct.Yourinterestinstudyingmechanicalengineering,infact,mayhavebeensparkedbyyourownideasforbuildinghardware.Theelementsofmechanicalengineeringthatwehaveexamineduptothispoint
4、-machinecomponentsandtools,forcesinstructuresandfluids,materialsandstresses,thermalandenergysystems,andthemotionofmachinery・areintendedtohavesetafoundationthatwillenableyoutoapproachmechanicaldesigninamoreeffectiveandsystematicmanner.INthatrespect,approachthetakeninthistextbookisacondensedanalogoft
5、hetraditionalengineeringcurriculum:Approximation,mathematics,andscienceareappliedtodesignproblemsinordertoincreaseperformanceandreducetrialanderror.ByapplyingtheresourcesofChapter2-7,youcanselectcertainmachinecomponentsandperformback-of-the-envelopecalculationtoguidedesigndecisions.Suchanalysesaren
6、otmadefortheirsakealone;rather,theyenableyoutodesignbetterandfast.Effectivemechanicaldesignisabroadarea,andthecreativeandtechnicalprocessesbehinditcannotbesetforthfullyinonechapter-orevenonetextbookforthatmatter.Indeed,withthismaterialasastartingpoint,youshouldcontinuetodevelophands-onexperienceand
7、designskillsthroughoutyourentireprofessionalcareer.Eventhemostseasonedgrappleswiththeprocedurefortransforminganideaintomanufacturedhardwarethatcanbesoldatareasonablecost.Afterfirstdiscussingthehierarchyofst