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1、中南大學碩士學位論文基于CMM復雜曲面測量的采樣方法及測頭半徑補償研究姓名:廖菲申請學位級別:碩士專業(yè):機械制造及其自動化指導教師:曾韜20090501插值的采樣方法和基于四點共球理論的測頭半徑補償方法實現(xiàn)了對自由曲面的測量優(yōu)化,滿足了使用要求,有一定的實際應用價值。關鍵詞:三坐標測量機,測量規(guī)劃,采樣方法,測頭半徑補償ABSTRACTThemeasuringproblemofcomplexsamplesexistswidelyinthefieldofautomobilemanufactureandmolding.Itisdifficultt
2、omeasurepartswithhighprecisioneffectivelyandgetageneraldetectionmethodanddataprocessingtechnology.Fortheexistingmeasuringtechniquehascertainlimitsandshortages,thisthesismainlyperformstheresearchofmeasurementplanningofcurvedsurfaceandoptimizationofthemeasuringpath.Thegasolin
3、eshellismeasuredbyusingGLOBALSTATUS575movingbridgetypeCMM(coordinatemeasuringmachine)ofHexagonandoptimizingofthemeasuringpathandcompensatingoftheproberadiusareinvestigatedsubsequently.Themainworksandresultsare-"1.Thehistoryofthemeasuringtechnologiesoffree—formsurfaceissurve
4、yedinthefirstpartofthisthesis.Theshortcomingsofthepresentmeasuringtechnologies,suchasdistributingpoints,overmanymeasuringpointsandcompensatingprecisionrapidly,areanalyzed.2.Thecubicsplinepredictionmethodisproposedbasedonthecomparingwiththepresentedconventionalsamplingmethod
5、s.AnanimateexampleisillustratedsubsequentlyandthepredictionmethodisprovedtobevalidinsimulationofMatlab.3.Basedontheanalysisofconventionalsamplingmethods,a,cubicsplinepredictionmethodbasedonthespecificpropertiesofcurvedsurfaceisdeveloped.Throughcomparingthepredictionaccuracy
6、andcomputationofcubicsplinepredictionmethodandpredictionmethod,theformerhasbeenprovedtoimprovethemeasurementefficiencyandaccuracy.4.Theexpriementofthemeasuringplanningispreformed.ThecloudpointisusedtoreconstructbyImageware.5.Themethodbasedon“four-pointbuildasphere’’theoryis
7、proposedbasedonpresenttwo.dimensionalcompensationandthree—dimensionalcompensationmethods.1116·Thetwocompensatingmethods,micro.spherecompensatingandsphnecompensatingmethodareusedtoanalyzethedatafromthegasolineshellexperiment.Theresultsshowthattheerrorsbymicro。spherecompensat
8、ingmethodiSfarlowerthanthat’Sobtainedbyusingsplinecompensatingmethod,andthemainlyr