动态聚焦激光振镜扫描系统的误差分析及图形校正算法-文世峰

动态聚焦激光振镜扫描系统的误差分析及图形校正算法文世峰,史玉升,谢军(华中科技大学材料学院塑性成形模拟及模具技术国家重点实验室,湖北武汉430074):动态聚焦激光振镜扫描系统广泛应用于大幅面激光扫描领域,在实现振镜高速扫描的同时,必须要保证扫描图形的精度本文从动态聚焦激光振镜扫描系统的原理入手,分析了动态聚焦激光振镜扫描系统图形误差产生的原因,并给出了扫描图形的误差校正模型和精确校正算法,并在华中科技大学快速成型中心的粉末烧结快速成型设备上进行了试验验证:振镜;动态聚焦;误差校正;算法:TN24:AErrorAnalysisandGraphicsCalibrationArithmeticofLaserGalvanometerScannerSystemwithDynamicFocusWENShifeng,SHIYusheng,XIEJun(MaterialScienceandTechnologyInstitute,HuazhongUniversityofScienceandTechnology,Wuhan430074,China)Abstract:Lasergalvanometerscannersystemwithdynamicfocusiswidelyusedinthefieldoflaserscanningwithbigworkfield.Theaccuracyofscanninggraphicsisveryimportantwhenthescannerscansquickly.Thispaperanalyzesthereasonsofgeneratingscanningerroroflasergalvanometerscannersystemwithdynamicfocusbasedonthetheoryofthesystem,andbringsoutthecalibrationarithmetic.Accordingtothis,weexperimentontheselectivelasersinteringmachineintherapidproductiondepartmentofHuazhonguniversity.Keywords:Galvanometerscanner,Dynamicfocus,Errorcalibration,Arithmetic,,,,,1,,,,;,,,XY,2,,,,,21,,,,,,1,,,2,XY,O(0,0)(x,y),1220095XOY22,XY0,O(0,0)(x,y),XOY:x=dtan+htansec(1)y=htan(2):dXY,hY;X,Ytan=A,0,(x-Ad)2(Ah)2-y2h2=1(3),,,,,3,2,p(x0,y0),;(x,y),(1)(2):x=arcotx0d+hsec(arcoty0h)(4)y=arcoty0h(5),,,,2n:x=fx0,y0=ni=0nj=0aijxi0yj0(6)y=gx0,y0=ni=0nj=0bijxi0yj0(7),x0,y0,xyxy,xy,n(x1,y1),(x2,y2),(xn,yn),,(x1,y1),(x2,y2),(xn,yn),n,4,39;,4,31,2,,,(6)(7),,1(:mm)1234567891X149.60149.50.0149.7149.3150.10150.4Y149.7150.3149.60.000149.6149.7150.32X150.10150.10.0150.1150.1149.90149.9Y150.1149.8150.10.000150.1150.0149.91320095Smith预估器控制蒸发器过热度的仿真林用满1,2,王惠龄1,杨九铭2,贾庆贤2(1.华中科技大学制冷与低温工程系,湖北武汉430071;2.广东美的制冷设备股份有限公司,广东佛山528311):针对蒸发器过热度控制系统的大时滞问题,提出采用预估器控制蒸发器过热度,该办法能克服大纯滞后,增强控制系统稳定性仿真表明,其控制效果优于常规控制,而且当过热度的环境和采样时间发生变化和控制参数没有改变时,具有更好的稳定性和鲁棒性,对于大时间滞后系统是一种比较实用的控制方法:蒸发器过热度;预估器;鲁棒性:TB61.1:ASimulationofSuperheatControlSystemforEvaporatorbasedonSmithPredictorLINYongman1,2,WANGHuiling1,YANGJiuming2,JIAQingxian2(1DepartmentofRefrigeration&Cryogenics,HuazhongUniversityofScienceandTechnology,Wuhan430074,China;2MideaRefrigerationEquipmentCo.Ltd.,Fushan528311,China)Abstract:Inthisthesis,adesignmethodofSmithpredictingcontrollerisusedfortheproblemofthelargedelayintem-peraturecontrolsystemofevaporator.Thismethodcannotonlyovercometheproblemoflargedelay,butcanenhancethestabilityofthecontrolsystem.TheSIMULINKsimulatingresultshowsthatthecontrollingeffectsofthissystemarebetterthanthatofPIDcontrollingsystem.Thismethodhasabetterstabilityandrobustness,whenthesuperheatandthesamplingtimearechanged,sothismethodismoreappliedforthelargedelaysystem.Keywords:Evaporatorofsuperheat,Smithcontrolsystem,Robustness,,,,,,,,[1-2][3][4-6],Simth,5,,,,,[1]VenkatakrishnanK,TanB,NgoiBKA.Two-axis-scan-ninglaserDopplervibrometerforprecisionengineering[J].OpticsandLasersinEngineering,2002,38:153-171.[2],,.[J].,2003,31(5):73-74.[3],.[J].,1997,18(3):35-37.[4].[J].,2001,21(5):325-327.[5].[J].,1997,27(5):35-39.:(1979-),,,:20091211420095