The dynamic excitation of a granular chain for biomedical ultrasound applications: contact mechanics finite element analysis and validation

P Gélat; J. Yang; P J Thomas; D A Hutchins; O Akanji; L A J Davis; S Freear; S Harput; N Saffari

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The dynamic excitation of a granular chain for biomedical ultrasound applications: contact mechanics finite element analysis and validation

机译：用于生物医学超声应用的颗粒链的动态激发：接触力学有限元分析和验证

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Therehasbeenrecentinterestinthetransmissionofacousticsignalsalonggranularchainsofsphericalbeadstoproducewaveformsofrelevancetobiomedicalultrasoundapplications.Hertziancontactbetweenadjacentbeadscanintroducedifferentharmoniccontentintothesignalasitpropagates.Thistransductionmechanismhasthepotentialtobeofuseinbothdiagnosticandtherapeuticultrasoundapplications,andistheobjectofthestudypresentedhere.Althoughdiscretedynamicsmodelsofthisbehaviourexist,amorecomprehensivesolutionmustbesoughtifchangesinshapeanddeformationofindividualbeadsaretobeconsidered.Thus,thefiniteelementmethodwasusedtoinvestigatethedynamicsofagranularchainofsix,1mmdiameterchromesteelsphericalbeadsexcitedatoneendusingasinusoidaldisplacementsignalat73kHz.Outputfromthismodelwascomparedwiththesolutionprovidedbythediscretedynamicsmodel,andgoodoverallagreementobtained.Inaddition,itwasabletoresolvethecomplexdynamicsofthegranularchain,includingthemultiplecollisionswhichoccur.Itwasdemonstratedthatunderdynamicexcitationconditions,theinabilityofdiscretemechanicsmodelstoaccountforelasticdeformationofthebeadswhentheselosecontact,couldleadtodiscrepancieswithexperimentalobservations...

机译：Therehasbeenrecentinterestinthetransmissionofacousticsignalsalonggranularchainsofsphericalbeadstoproducewaveformsofrelevancetobiomedicalultrasoundapplications.Hertziancontactbetweenadjacentbeadscanintroducedifferentharmoniccontentintothesignalasitpropagates.Thistransductionmechanismhasthepotentialtobeofuseinbothdiagnosticandtherapeuticultrasoundapplications，andistheobjectofthestudypresentedhere.Althoughdiscretedynamicsmodelsofthisbehaviourexist，amorecomprehensivesolutionmustbesoughtifchangesinshapeanddeformationofindividualbeadsaretobeconsidered.Thus，thefiniteelementmethodwasusedtoinvestigatethedynamicsofagranularchainofsix，1mmdiameterchromesteelsphericalbeadsexcitedatoneendusingasinusoidaldisplacementsignalat73kHz.Outputfromthismodelwascomparedwiththesolutionprovidedbythediscretedynamicsmodel，andgoodoverallagreementobtained.Inaddition，itwasabletoresolvethecomplexdynamicsofthegranularchain，includingthemultiplecollisionswhichoccur.Itwasdemonstratedthatunderdynamicexcitationconditions，日离散的力学模型的可预测性，考虑到小接触时小珠的弹性变形，可能导致实验观察的差异...

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《Journal of Physics: Conference Series》 |2016年第1期|共页
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P Gélat; J. Yang; P J Thomas; D A Hutchins; O Akanji; L A J Davis; S Freear; S Harput; N Saffari;
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7. The dynamic excitation of a granular chain for biomedical ultrasound applications : contact mechanics finite element analysis and validation [O] . Gelat, Pierre, Yang, Jia, Thomas, P. J. (Peter J.), 2016

机译：用于生物医学超声应用的颗粒链的动态激发：接触力学有限元分析和验证

The dynamic excitation of a granular chain for biomedical ultrasound applications: contact mechanics finite element analysis and validation

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