收稿日期:2022-06-04点阵板结构固有频率等效模型误差分析刘帅1,杨睿1,冀宾2,牛斌1(1.大连理工大学机械工程学院,辽宁大连116024;2.上海宇航系统工程研究所,上海201109)摘要:点阵材料是一种新兴的轻质高强的材料,由于其具有多尺度特征,采用离散模型需要对所有板杆进行建模和网格划分,导致频率分析费时。常采用均匀化后的等效模型进行分析。主要对等效模型进行频率分析,讨论点阵材料各参数对频率的影响。以一块四边固支的仅具有面内周期性的点阵板为研究对象,分别使用离散模型和三维周期性材料均匀化等效模型、周期性板结构的均匀化等效模型,开展周期性点阵板结构的固有频率的计算,分别改变点阵板的单胞内部参数、单胞的排布个数、单胞的构型,讨论这些因素对固有频率的影响。进而,以离散模型的结果为基准,对等效模型的求解结果进行误差分析,结果显示针对具有面内周期性的点阵板结构,Mindlin等效板模型预测的固有频率误差较小。关键词:点阵板;渐近均匀化;频率分析中图分类号:TB34文献标志码:A文章编号:1009-9492(2023)03-0134-04ErrorAnalysisofEquivalentModelofNaturalFrequencyofLatticePlateStructureLiuShuai1,YangRui1,JiBin2,NiuBin1(1.SchoolofMechanicalEngineering,DalianUniversityofTechnology,Dalian,Liaoning116024,China;2.ShanghaiInstituteofAerospaceSystemsEngineering,Shanghai201109,China)Abstract:Latticematerialisanewkindoflightweightandhigh-strengthmaterial.Duetoitsmulti-scalecharacteristics,itistime-consumingtoconductfrequencyanalysisusingdiscretefiniteelementmodel,whichmodelsandmeshesalltheplatesandrods.Thehomogenizedequivalentmodelisoftenusedforanalysis.Thefrequencyoftheequivalentmodelwasmainlyanalyzedandtheinfluenceoftheparametersofthelatticematerialonthefrequencywasdiscussed.Takingalatticeplateclampedatfouredgeswithonlyin-planeperiodicityasanexample,thenaturalfrequencyoftheperiodiclatticeplatestructurewascalculatedusingthediscretemodel,thethree-dimensionalperiodicmaterialhomogenizationequivalentmodelandtheperiodicplatestructurehomogenizationequivalentmodel.Bychangingtheinternalparametersoftheunitcell,thearrangementoftheunitcellandthecellconfigurationrespectively,theeffectsontheresultswerediscussed.Then...