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1、附录英文原文ThePre-ProcessingofDataPointsforCurveFittinginReverseEngineeringReverseengineeringhasbecomeanimportanttoolforCADmodelconstructionfromthedatapoints,measuredbyacoordinatemeasuringmachine(CMM),ofanexistingpart.Amajorprobleminreverseengineeringisthatthemeasuredpointshavinganirregularformatan
2、dunequaldistributionaredifficulttofitintoaB-splinecurveorsurface.Thepaperpresentsamethodforpre-processingdatapointsforcurvefittinginreverseengineering.TheproposedmethodhasbeendevelopedtoprocessthemeasureddatapointsbeforefittingintoaB-splineform.Theformatofthenewdatapointsregeneratedbythepropos
3、edmethodissuitablefortherequirementsforfittingintoasmoothB-splinecurvewithagoodshape.Theentireprocedureofthismethodinvolvesfiltering,curvatureanalysis,segmentation,regressing,andregeneratingsteps.Themethodisimplementedandusedforapracticalapplicationinreverseengineering.Theresultofthereconstruc
4、tionprovestheviabilityoftheproposedmethodforintegrationwithcurrentcommercialCADsystems.IntroductionWiththeprogressinthedevelopmentofcomputerhardwareandsoftwaretechnology,theconceptofcomputer-aidedtechnologyforproductdevelopmenthasbecomemorewidelyacceptedbyindustry.Thegapbetweendesignandmanufac
5、turingisnowbeinggraduallynarrowedthroughthedevelopmentofnewCADtechnology.Inanormalautomatedmanufacturingenvironment,theoperationsequenceusuallystartsfromproductdesignviageometricmodelscreatedinCADsystems,andendswiththegenerationofmachininginstructionsrequiredtoconvertrawmaterialintoafinishedpr
6、oduct,basedonthegeometricmodel.Torealizetheadvantagesofmoderncomputer-aidedtechnologyintheproductdevelopmentandmanufacturingprocess,ageometricmodeloftheparttobecreatedintheCADsystemisrequired.However,therearesomesituationsinproductdevelopmentinwhichaphysicalmodelorsampleisproducedbeforecreatin
7、gtheCADmodel:1.Whereaclaymodel,forexample,indesigningautomobilebodypanels,ismadebythedesignerorartistbasedonconceptualsketchesofwhatthepanelshouldlooklike.2.Whereasampleexistswithouttheoriginaldrawingordocumentationdefinition.3.Wherethe
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