毕业设计-外文翻译

外文翻译题目学院专业姓名学号指导教师2016.11.02—2017.5.13机电工程学院机械设计制造及其自动化毕业设计第1页共8页Researchandapplicationofreverseengineeringdesignforautomobilepanel[Abstract]:Inthedesignprocessoftheautomobilepanel，reverseengineeringhasbeenmorewidelyused.Takingacarfenderasanexampleofreversedesign，theuseofdigitalphotographyandopticalscan－ning，thepointcloudswereobtainedbytheATOS&TriTopsystembasedopticalprinciples.CharacteristicsforautomobilepanelandtheImagewaresoftwareaboutreverseengineering，detailedreverseengineeringofautomobilepaneldesignforcurveandsurfacebythelargenumberofdatapoints[Keywords]:Automobilepanel；Reverseengineering；Surfacereconstruction；Imagewaresoftware1IntroductionReverseEngineeringisunderthepremiseoftheonlyproductmodelorphysicalmodelandnoproductdefinitionanddrawings,BymeasuringthedataobtainedinordertoestablishdigitalmodelThesemodelswerethenusedtoanalyzeandcharacterizetheproduct,manufacturingandprocessingprocedures.Asameansofproductdesignandmanufacturing,reverseengineeringhasbeenwidelyusedinrecentyears,especiallyinthefieldofrapiddevelopmentoftheautomobile.Reverseengineeringtechnologyforautomobilemanufacturerstodigest,absorbadvancedtechnology,fastandefficientdevelopmentofnewproductsplayanimportantrole.Comparedwiththetraditionalforwardengineering,thereverseengineeringhastheadvantagesofhighdesignprecision,shortdevelopmentanddesigncycle,easyfollow-upfiniteelementanalysis,optimizationdesignandkinematicssimulation.Combinedwiththepracticalworkexperiencefortheenterpriseservice,thetypicalcarcoverproducts-fenderasanexample,introducedthecarcoverreversedesignprocessandmethod.23DpointdataacquisitionautomobilecoveringpartsWiththedevelopmentofrelatedtechnologiessuchassensingtechnology,controltechnology,imageprocessingtechnologyandcomputervisiontechnology,atpresent,therearevariouskindofsurfacegeometrydataacquisitionmethod.Inviewofthelargevolumeandhighprecisionoftheautomobilecover,weusethenon-contactdigitalphotographyandopticalscancombinationofdatacollectionbasedonopticalprinciplesATOS&TriTopsystem,whichistheGermanGOMproductioncompany,iscurrentlytheworld.Oneofthemostadvancednon-contactcoordinatescanningsystem,withawiderangeofmeasurement,scanningspeed,bytheenvironmental机电工程学院机械设计制造及其自动化毕业设计第2页共8页impactofsmall,stableperformance,easytocarry,easytooperate,etc.,intheautomotiveindustryiswidelyused.Thesystemconsistsoftwomodules,namelyATOSportable3DscannermoduleandTriTopdigitalcameramodule,acombinationofboth,tobecompletedbythemeasurementoflargeworkpieces,toachievethree-dimensionalscanningspeed,andtoachievehighermeasurementaccuracy.Keypointsofscanningtechnologyforautomobilepanel.2.1Readyforworkthepartthatneedstobescanedshouldbepre-processedsurfacely,Inordertopreventthehighlightorinadequatereflection,toincreasetheimageofthesurfaceoftheobject,objectattheoutersurfaceshallbeuniformlysprayedwhiteimagingagent,andthenpastethereferencepoint,digitalpointandlengthafterplacedintheabovecalibration,AsshowninFigure1.ATOSusesthereferencepointtechniqueformultiviewregistration,forlargemeasurementmeasurement,inadditiontoplacethereferencepoint,alsoplacedproprietarydigitalpointandafterencodinglengthaftercalibration,theaccuratepositioningofallthe3Dcoordinatesofthereferencepoint,thusreducingtheregistrationerror.Figure1measuringscale,digitalpointandreferencepoint2.2CalibrationofATOSsystem(1)Hardwarecalibration.AfterenteringtheATOSsoftwaresystem,thehardwareofthesystemmustbecalibratedfirstly.ThemainpurposeofthehardwarecalibrationisthateachCCDcameraisingoodworkingconditiontoobtainthebestimagingeffect.Softwarecalibration.Softwarecalibrationisdoneafterhardwarecalibration,Usedtomeasurethespatialdistanceonthecalibrationplatein11differentdirectionsofmeasurement,usedasaspatialrelationshipafterthescan.2.3AcquisitionofpointclouddataofautomobilepanelTheuseofATOS&Tritopsystem,firstwithhighresolutionTritopdigitalcamerainordertoshootallthereferencepointsandscale.Intheprocessoftakingpictures,eachpictureatleastfiveencoding,eachencodingatleasttoappearinthe机电工程学院机械设计制造及其自动化毕业设计第3页共8页threephoto,andthenputallthephotosinsystem,thesystemwillautomaticallylocateallthereferencepoint.UsetheTritopsystemtomeasurethespatiallocationisonlyareferencepoint,butcannotbemeasuredobjectsurfacedata,soalsouseAtosscanningsystemTritopsystemaccordingtothemeasureddataofthereferencepoint,multianglescanning,willcoordinatethedataautomaticallyalignedtotheTritopsystemtoset.Registrationerrorreductionneedsmultipleoverlappingmeasurements.Intheprocessofmeasurement,therewillbeaseriousdiscrepancybetweenthepointcloudandthephysicallocation.Atthispoint,weshoulddeletetheerrorpointcloud,reselectthemeasurementareaandreferencepointformeasurement;theboundarypointcloudisnotcompleteisamajordefectofAtosscanning,sothemeasurementshouldbestrengthenedintheprocessofboundarysurvey.3Preprocessingof3DpointclouddataforautomobilepanelAfterthecompletionoftheaboveautoscan,thescanningpointclouddatawereprocessedbytheATOSscannersoftwareandtheprofessionalreversedesignsoftwareImageware.3.1PointclouddataprocessingofATOSscannersoftwareDataprocessingisakeylin