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1、附录A:ThePre-ProcessingofDataPointsforCurveFittinginReverseEngineeringReverseengineeringLIntroductionWiththeprogressinthedevelopmentofcomputerhardwareandsoftwaretechnology,theconceptofcomputer-aidedtechnologyforproductdevelopmenthasbecomemorewidelyacceptedbyindustry.Thegapbetweendesignandmanufactu
2、ringisnowbeinggraduallynarrowedthroughthedevelopmentofnewCADtechnology.Inanormalautomatedmanufacturingenvironment,theoperationsequenceusuallystartsfromproductdesignviageometricmodelscreatedinCADsystems,andendswiththegenerationofmachininginstructionsrequiredtoconvertrawmaterialintoafinishedproduc
3、t,basedonthegeometricmodel.Torealisetheadvantagesofmoderncom-puter-aidedtechnologyintheproductdevelopmentandmanufacturingprocess,ageometricmodeloftheparttobecreatedintheCADsystemisrequired.However,therearesomesituationsinproductdevelopmentinwhichaphysicalmodelorsampleisproducedbeforecreatingtheC
4、ADmodel:1.Whereaclaymodel,forexample,indesigningautomobilebodypanels,ismadebythedesignerorartistbasedonconceptualsketchesofwhatthepanelshouldlooklike.2.Whereasampleexistswithouttheoriginaldrawingordocumentationdefinition.3.WheretheCADmodelrepresentingtheparthastoberevisedowingtodesignchangedurin
5、gmanufacturing.Inallofthesesituations,thephysicalmodelorsamplemustbereverseengineeredtocreateorrefinetheCADmodel.Incontrasttothisconventionalmanufacturingsequence,reverseengineeringtypicallystartswithmeasuringanexistingphysicalobjectsothataCADmodelcanbededucedinordertoexploittheadvantagesofCADte
6、chnologies.Theprocessofreverseengineeringcanusuallybesubdividedintothreestages,i.e.datacapture,datasegmentationandCADmodellingand/orupdating[1,2].Aphysicalmock-uporprototypeisfirstmeasuredbyacoordinatemeasuringmachineoralaserscannertoacquirethegeometricinformationintheformof3Dpoints.Themeasuredr
7、esultsarethensegmentedintotopologicalregionsforfurtherprocessing.Eachregionrepresentsasinglegeometricfeaturethatcanberepresentedmathematicallybyasimplesurfaceinthecaseofmodelreconstruction.CADmodellingreconstructsthesurfaceo
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