第39卷第3期2023年6月Electro-MechanicalEngineering·环境适应性设计·DOI:10.19659/j.issn.1008–5300.2023.03.007基于模态扩展和曲率的形变混合重构*成东明1,刘法2,周金柱1,赵征1(1.西安电子科技大学电子装备结构设计教育部重点实验室,陕西西安710071;2.中国电子科技集团公司第十研究所,四川成都610036)摘要:文中提出了一种基于模态扩展和曲率的形变混合重构方法,该方法在实物和有限元模型之间存在一定误差的情况下可以适当降低形变重构的误差。首先,通过模态实验在待重构的表面上均匀选取有限个测点来获取实验模态,接着用对应的有限元模态振型列表来平滑扩展这些实验模态,之后用平滑扩展的实验模态来重构大量的应变值,为了防止求取模态坐标时出现过拟合,此处引入了正则项。然后,将应变值转化为曲率,再通过切角递推公式求得相邻点的位移增量,随后耦合单元坐标增量便可获得全场的形变。最后,通过建立有限元模型进行仿真实验验证,并将此方法的重构结果与曲率法的结果进行对比以验证其有效性。关键词:形变重构;曲率法;实验模态中图分类号:TN82文献标识码:A文章编号:1008–5300(2023)03–0029–06HybridDeformationReconstructionBasedonModeExpansionandCurvatureCHENGDongming1,LIUFa2,ZHOUJinzhu1,ZHAOZhen1(1.KeyLaboratoryofElectronicEquipmentStructureDesignofMinistryofEducation,XidianUniversity,Xi’an710071,China;2.The10thResearchInstituteofCETC,Chengdu610036,China)Abstract:Inthispaper,ahybriddeformationreconstructionmethodbasedonmodeexpansionandcurvatureisproposed.Thismethodcanappropriatelyreducetheerrorofdeformationreconstructionwhenthereiscertainerrorbetweentherealobjectandthefiniteelementmodel.Firstly,theexperimentalmodesareobtainedbyuniformlyselectingalimitednumberofmeasuringpointsonthesurfacetobereconstructed,andthenthecorrespondingfiniteelementmodelistisusedtosmoothlyexpandtheobtainedexperimentalmodes.Afterthat,alargenumberofstrainvaluesarereconstructedbythesmoothlyexpandedexperimentalmodes,andaregulartermisintroducedheretopreventover-fittingwhenobtainingmodalcoordinates.Secondly,thestrainvalueistransformedintocurvatureandthedisplacementincrementoftheadjacentpointsisobtainedbythechamferrecurrenceformula,andthenthedeforma...