文档名：曲轴综合测量机几何误差建模及敏感性分析
摘要：为提高曲轴综合测量机测量精度,针对其几何误差元素多,逐一进行补偿工作量大、过程繁琐等问题,基于多体系统理论和齐次坐标变换建立曲轴综合测量机的几何误差模型,采用Sobol敏感性分析方法进行分析,识别出对测量精度影响较大的关键几何误差项.通过对曲轴综合测量机随动测板不同位置处的误差元素敏感性系数进行分析计算,从21项几何误差中识别出10项对曲轴综合测量机测量精度影响较大的关键项,为合理经济地提高曲轴综合测量机测量精度提供依据.
Abstract：Summary:Thecrankshaftcomprehensivemeasuringmachinecanrealizetheautomaticdetectionofkeyparametersofthecrankshaft.Inordertoimprovethemeasuringaccuracyofthecrankshaftcomprehensivemeasuringmachine,inviewofthemanygeometricerrorelementsofthecrankshaftcomprehensivemeasuringmachine,thecompensationworkislargeandtheprocessiscomplicated.Thecrankshaftcomprehensivemeasuringmachinemadebyourresearchgroupisstudiedbyusingthemulti-bodydynamicstheory.Thedynamicstheoryofmulti-bodysystemisusuallyexpressedbythecombinationofhomogeneouscoordinatetransformationandloworderbodysequence.Theloworderbodysequenceisusedtodescribetherelationshipbetweenthetypicalbodiesinthetopologicalstructureofthecrankshaftintegratedmeasuringmachine,andtherelationshipofdegreesoffreedombetweenthecomponentsofthemeasuringmachineisdetermined.Basedontheprincipleofhomogeneouscoordinatetransformation,theposerelationshipbetweentheadjacentbodyofthecrankshaftcomprehensivemeasuringmachineintheidealstateandtheactualstateisdescribed,andtheidealstatic,actualstatic,idealmotionandactualmotiontransformationmatrixbetweeneachadjacentbodyisdetermined.Finally,accordingtothedeviationbetweentheactualmeasuringpointcoordinatesandtheidealmeasuringpointcoordinates,thecorrespondingspatialgeometricerrorisobtained.Thegeometricerrormodelofverticalcrankshaftmeasuringmachineisestablished.Inordertodeterminethedegreeofinfluenceofgeometricerroronthemeasuringaccuracyoftheverticalcrankshaftmeasuringmachineandidentifythekeyerroritemsthathavegreatinfluenceonthemeasuringaccuracyofthecrankshaftmeasuringmachine,thegeometricerrormodelofthecrankshaftcomprehensivemeasuringmachineisanalyzedbyusingSobolglobalsensitivityanalysismethod.MonteCarlomethodisemployedtoestimatethevarianceofthegeometricerrormodelofthecrankshaftcomprehensivemeasuringmachine,andthesensitivitycoefficientofthecorrespondinginputiscalculatedbytheratioofthevarianceofthecorrespondingfunctionvaluetothetotalvarianceoftheerrormodel.Inthemeasuringspaceofthecrankshaftcomprehensivemeasuringmachine,fivecoordinatepointsareuniformlyselectedalongtheXdirectiontocalculatethesensitivitycoefficientofeachgeometricerrortermalongtheXdirectionatthefivecoordinatepoints,andthemeanvalueofthefivesensitivitycoefficientsiscalculated.Similarly,thecorrespondingfivecoordinatepointsareselectedattheotherthreedifferentheightstocalculatethesensitivitycoefficientofeacherrorterm.Themeanvalueofsensitivitycoefficientisalsocalculated,andthemeanvalueofeacherrorisarrangedintheorderofincreasingheight,andthemedian0.1istakenasthethresholdtojudgewhethereachgeometricerroritemofthecrankshaftcomprehensivemeasuringmachineisthekeyerroritem.Finally,10keyerrorswhichhavegreatinfluenceonthemeasuringaccuracyofcrankshaftcomprehensivemeasuringmachineareidentifiedfrom21geometricalerrors.Determiningthekeyerrortermscannotonlyprovideabasisforthesubsequenterrorcompensationandimprovethemeasuringaccuracyofthecrankshaftcomprehensivemeasuringmachine,butalsoprovideatheoreticalbasisfordesigningandoptimizingthestructureofthecrankshaftcomprehensivemeasuringmachine.
作者：王亚晓 杨科科Author：WANGYaxiao YANGKeke
作者单位：西安工业大学机电工程学院,西安710021
刊名：重庆理工大学学报 PKU
Journal：JournalofChongqingInstituteofTechnology
年，卷(期)：2024, 38(9)
分类号：TG806TH161
关键词：曲轴综合测量机 多体系统理论 Sobol敏感性分析 蒙特卡洛估算 关键几何误差
Keywords：crankshaftcomprehensivemeasuringmachine multibodysystemtheory Sobol'sensitivityanalysis MonteCarloestimation keygeometricerrors
机标分类号：TH161TG659TP202
在线出版日期：2024年7月11日
基金项目：陕西省工业科技攻关项目曲轴综合测量机几何误差建模及敏感性分析[
期刊论文] 重庆理工大学学报--2024, 38(9)王亚晓 杨科科为提高曲轴综合测量机测量精度,针对其几何误差元素多,逐一进行补偿工作量大、过程繁琐等问题,基于多体系统理论和齐次坐标变换建立曲轴综合测量机的几何误差模型,采用Sobol敏感性分析方法进行分析,识别出对测量精度影响...参考文献和引证文献
参考文献
引证文献
本文读者也读过
相似文献
相关博文
曲轴综合测量机几何误差建模及敏感性分析 Geometric error modeling and sensitivity analysis of crankshaft comprehensive measuring machine
曲轴综合测量机几何误差建模及敏感性分析.pdf
- 文件大小:
- 4.29 MB
- 下载次数:
- 60
-
高速下载
|
|
