基于Ansys软件的板中Lamb波激励特性仿真研究.docVIP

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基于Ansys软件的板中Lamb波激励特性仿真研究

摘要:超声Lamb波检测技术是薄板结构检测一种较为先进的无损检测技术,其在石化、航空、电力、核能等领域具有显著的优点和作用，且创造了很大的社会效益及经济效益。首先，对Lamb波检测的国内外现状做了阐述。介绍了动力学的基本理论，对瞬态分析和模态分析做了详细的介绍。其次，对ANSYS仿真模拟板中Lamb波的传播的基本过程做了阐述，针对板中Lamb波传播的有限元仿真，对各步骤的内容做了简单的阐述。通过二维有限元建模，首先对Lamb波在板中传播数值模拟的具体参数确定做了详细的阐述，对Lamb波的频散现象做出了分析，主要分析频散现象之后的A0模态和S0模态，并对MATLAB数值模拟的结果进行分析，接着对单模态激励的方法进行了解释，并用单模态激励的方法对无缺限和有缺陷的板结构进行有限元仿真，确定有限仿真的意义。

关键词:薄板，超声，Lamb波，有限元，无损检测

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Abstract

Abstrack:UltrasonicLambwavedetectiontechnologyisthedetectionofthinplatestructureamoreadvancednondestructivedetectiontechnology,hassignificantadvantagesandrolesinpetrochemical,aviation,electricpower,nuclearpowerandotherfields,andthecreationofgreatsocialandeconomicbenefits.ButbecauseoftheLambwavedispersioncharacteristics,limitingitsapplicationtopracticalindustrialproduction,inordertodeterminetheparametersandmodalanalysis,thispaperonthepropagationcharacteristicsofLambwavesinaplate,dispersioncurveanditsdefectdetectionresearchandspecificworkisasfollows:

First,theLambwavedetectionofdomesticandforeignstatusquoisdescribed.Thebasictheoryofdynamicsisintroduced,andthetransientanalysisandmodalanalysisareintroducedindetail..Explained,firstelaboratedthepropagationofLambwaves,followedbyANSYSsimulationinthebasicprocessforplateintheLambwavepropagationinfiniteelementsimulation,thestepsofcontenttodoasimpleexposition,thetwo-dimensionalfiniteelementmodelingofLambwavesinplatepropagationnumericalsimulationofspecificparameterstodeterminethedetailedelaborationofthelambwavedispersionphenomenontomaketheanalysis,themainanalysisoffrequencydispersionphenomenonaftertheA0modeandS0mode,andtheMATLABnumericalsimulationresultsareanalyzed,andthenthesinglemodalexcitationmethod,andwithasinglemodeexcitationmethodofdefecta