汽車車身曲面反求中點(diǎn)云分塊方法研究及應(yīng)用.pdf

1、山東理工大學(xué)碩士學(xué)位論文汽車車身曲面反求中點(diǎn)云分塊方法研究及應(yīng)用姓名：王峰申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：車輛工程指導(dǎo)教師：王玉林李旭20060401山東理工大學(xué)碩士學(xué)位論文英文摘要AbstractAlongwiththeproductdigitizationandthefastmanufacturetechnologydevelopment，thereverseengineeringtechnologyobtainedextensiveres

2、earchandtheapplicationintheautobodydesignTheautobodysurfacewasgenerallyproducedbyquadraticsurfaceandfreeformsurfacesthroughextensiontransitionandcutoutFittingcomplexauto—bodysurfacewithasolesurfacemathematicalmodel啪’tgua

3、ranteetheprecisionofreconstructionsurfaceMoreovertheautobodysurfacequalityspecificationrequeststheboundarylineshapelightbetw嘲1variouscurvedsurfaceandadjacentregionhasnoobviousdistortionTherefore，fortheconvenienceofsu確ace

4、reconstructionandpartialrevision，andenhancingthequalityofreconstructionsurface，thepointcloudsegmentationisneedThepointcloudsegmentationismextremelyessentialstepinthereversemodeldesignThesegmentationresultswillaffectthesu

5、rfacefittingandtheCADmodelreconstructionqualitydirectlyInviewofthequestioninthreedimensionalsc圳：tt刪pointcloudsegmentationtheconceptthroughwithdrawing打ansifion目BrfacebetweenthecurvedSBlfac是tosegmentthepointdoudisproposed，

6、andtwomethodsforregionsegmentationalgorithmhasbeenrealized“andimprovedbasedonthisconceptFirst，amethodforregionsegmentationalgorithmaccordingtotheplanar@hasbeenrealizedandimproved，whichextractstransitionsurfacebetweenthec

7、urvedsurfacethroughtheaveragesquarederroroftheleastsquaresplanefitofdatapointanditsneighborhoodThismethodcansegmenttheautobodysurfaceincludingincisiveboundaryandsmallblendsurfaceeffectivelyNext，amethodforregionsegmentati

8、nnalgorithmaccordingtothelogarithmicvalueofnormal，vectorhasbeenrealizedandimproved，whichdeterminatesdatapointcharacterthroughthelogarithmicvalueofnormalvectorratioThecurvedgurfaeewhichcontainsmoothtransitionregionc觸beseg

9、mentedeffectivelyThelogarithmicmethodandthedataPOintweightedaveragealgorithmareused，whichreducetheinfluenceonsegmeaatprecisionof鰣dasymmetryandthescattereddatapointundulation，andstrengthenthealgorithmstabilityandvalidityF

10、inally，theimprovedplanaritysegmentationalgorithmandtheimprovedlogarithmicsegmentationalgorithmwereappliedintheauto—bodysurfacepointcloudsegmentationnealgorithmsvalidityandusabilityhavebeenproventhrou曲theauto—bodysurfaces