机械装配耦合动刚度的逆子结构辨识方法.pdf

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1、第52卷第9期机械工程学报Vol.52No.92016年5月JOURNALOFMECHANICALENGINEERINGMay2016DOI：10.3901/JME.2016.09.086*机械装配耦合动刚度的逆子结构辨识方法121吕广庆仪垂杰方科(1.暨南大学教育部重大工程灾害与控制重点实验室广州510632；2.青岛理工大学机械工程学院青岛266033)摘要：为检测机械装配的动态质量，基于子结构法分析装配工艺对部件动态传递特性的影响作用，明确装配耦合动刚度是影响机械装配动态质量的唯一决定性关键因

2、素。在阐述装配耦合动刚度的直接逆子结构辨识方法(直接法)并分析其在生产实践应用中存在的缺陷之后，建立五类装配耦合动刚度的基于频率响应函数(Frequencyresponsefunction,FRF)谱的间接逆子结构辨识方法(间接法)，并给出单点耦合和多点耦合计算公式及其工程适用条件。分析表明，五类间接法完全或部分避免直接法存在的测试操作困难，第一类间接法辨识精度受FRF谱测量误差影响最低且与直接法相近，可作为机械装配耦合动刚度辨识的最优间接法选项。逆子结构辨识方法的理论完备性和第一类间接法的应用有效

3、性分别经机械装配二级子结构集总参数模型及其类比试验模型予以检验，为机械装配耦合动刚度辨识及其动态质量检测提供新的有效技术方法。关键词：机械装配；耦合动刚度；逆子结构辨识；频率响应函数中图分类号：TB123；TH164InverseSubstructuringMethodsforIdentifyingCouplingDynamicStiffnessofMechanicalAssembly121LÜGuangqingYIChuijieFANGKe(1.MOEKeyLabofDisastersForeca

4、standControlinEngineering,JinanUniversity,Guangzhou510632;2.SchoolofMechanicalEngineering,QingdaoTechnologicalUniversity,Qingdao266033)Abstract：Inordertoinspectdynamicqualityofmechanicalassembly,theeffectsofassemblingprocessonthedynamictransferringchar

5、acteristicsoftheinvolvedcomponentsareanalyzedbysubstructuringanalysis,andcouplingdynamicstiffnessoftheassemblyisclarifiedexplicitlyastheuniquedominantfactorforthedynamicquality.Afterexplainingdirectinversesubstructuringapproachofidentificationonthestif

6、fness(directapproach)andanalyzingitsdefectsinpracticalapplication,fivetypesofindirectinversesubstructuringapproaches(indirectapproach)areestablishedusingspectral-basedfrequencyresponsefunctions(FRFs),includingtheirformulationsincasesofsingle-andmulti-c

7、ouplingconnection(s)ofassemblingprocess,andtheirapplicableengineeringconditions.Analyticalresultsshowthat,thefivetypesofindirectapproachesovercometotallyorpartiallythetest-difficultyofthedirectone.Inaddition,thefirsttypeindirectapproachisrelativelynots

8、usceptibletoFRF-measurementerrors,asitdoesbythedirectone,andcanbeappliedasanoptimumindirectapproachforidentifyingthestiffness.Theoreticalcompletenessofthedirectandindirectapproachesandapplicationeffectivenessofthefirstindirectapproachar