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Computational and Experimental Investigation of Human Skull Dynamics
Computational and Experimental Investigation of Human Skull Dynamics
Computational and Experimental Investigation of Human Skull Dynamics

Detailed Information

Material Type  
 단행본
 
0017366014
Date and Time of Latest Transaction  
20260209102914
ISBN  
9798263396985
DDC  
000
Author  
Kohtanen, Eetu.
Title/Author  
Computational and Experimental Investigation of Human Skull Dynamics
Publish Info  
[Sl] : Georgia Institute of Technology, 2023
Publish Info  
Ann Arbor : ProQuest Dissertations & Theses, 2023
Material Info  
148 p
General Note  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
General Note  
Advisor: Erturk, Alper.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
Abstracts/Etc  
요약The human skull is a remarkable structure that exhibits a host of complexities in its dynamics. This work presents a fundamental investigation in which aspects that influence the dynamic behavior of the skull are analyzed computationally and experimentally. First, a finite element model construction routine is developed that produces geometrically accurate three-dimensional vibration models of cranial segments where the cortical tables and the diploe have their own material domains. Numerical models of different cranial regions are generated and employed in an optimization scheme together with experimental modal properties to extract the effective elastic parameters of the composite layers. The resulting parameters and modal damping ratios are showcased for a selection of cranial segments including the parietal, frontal, occipital, and temporal bones. This numerical-experimental framework is also extended to the case of cranial sutures, which are joints that connect adjacent cranial regions, that may significantly affect the overall stiffness and damping. Lastly, the effect of fluid loading is studied by degassing the segments, which removes the air from the bone pores and replaces it with water, bringing the bone state closer to the in vivo condition where the pores are filled with bone marrow. The additional effect of external fluid loading emulating the brain and/or clinical setups that often feature a water bath for ultrasound delivery is also considered by combination of submersed vibration experiments and numerical models. To demonstrate the use of the identified elastic parameters, two case studies are presented. In the first, the elastic properties of the cranial segments are assumed as representative parameters for a full human skull. A high-fidelity numerical model of the skull is developed, and the experimental and numerical modal properties are obtained for the dry and degassed bone states with representative vibration modes identified and compared. In the second study, the degassed elastic parameters are applied to analyze the transcranial radiation of guided waves, which in recent years has received growing interest, by means of time transient finite element simulations and submersed experimental results, confirming the use of the high-fidelity modeling, analysis, and parameter identification framework presented herein.
Subject Added Entry-Topical Term  
Sutures
Subject Added Entry-Topical Term  
Parameter identification
Subject Added Entry-Topical Term  
Geometry
Subject Added Entry-Topical Term  
Radiation
Subject Added Entry-Topical Term  
Mechanical engineering
Index Term-Uncontrolled  
Parameter identification
Index Term-Uncontrolled  
Human skull dynamics
Added Entry-Corporate Name  
Georgia Institute of Technology.
Host Item Entry  
Dissertations Abstracts International. 87-06B.
Electronic Location and Access  
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MARC

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■020    ▼a9798263396985
■035    ▼a(MiAaPQ)AAI32316202
■035    ▼a(MiAaPQ)GeorgiaTech72729
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a000
■1001  ▼aKohtanen,  Eetu.
■24510▼aComputational  and  Experimental  Investigation  of  Human  Skull  Dynamics
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a148  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisor:  Erturk,  Alper.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2023.
■520    ▼aThe  human  skull  is  a  remarkable  structure  that  exhibits  a  host  of  complexities  in  its  dynamics.  This  work  presents  a  fundamental  investigation  in  which  aspects  that  influence  the  dynamic  behavior  of  the  skull  are  analyzed  computationally  and  experimentally.  First,  a  finite  element  model  construction  routine  is  developed  that  produces  geometrically  accurate  three-dimensional  vibration  models  of  cranial  segments  where  the  cortical  tables  and  the  diploe  have  their  own  material  domains.  Numerical  models  of  different  cranial  regions  are  generated  and  employed  in  an  optimization  scheme  together  with  experimental  modal  properties  to  extract  the  effective  elastic  parameters  of  the  composite  layers.  The  resulting  parameters  and  modal  damping  ratios  are  showcased  for  a  selection  of  cranial  segments  including  the  parietal,  frontal,  occipital,  and  temporal  bones.  This  numerical-experimental  framework  is  also  extended  to  the  case  of  cranial  sutures,  which  are  joints  that  connect  adjacent  cranial  regions,  that  may  significantly  affect  the  overall  stiffness  and  damping.  Lastly,  the  effect  of  fluid  loading  is  studied  by  degassing  the  segments,  which  removes  the  air  from  the  bone  pores  and  replaces  it  with  water,  bringing  the  bone  state  closer  to  the  in  vivo  condition  where  the  pores  are  filled  with  bone  marrow.  The  additional  effect  of  external  fluid  loading  emulating  the  brain  and/or  clinical  setups  that  often  feature  a  water  bath  for  ultrasound  delivery  is  also  considered  by  combination  of  submersed  vibration  experiments  and  numerical  models.  To  demonstrate  the  use  of  the  identified  elastic  parameters,  two  case  studies  are  presented.  In  the  first,  the  elastic  properties  of  the  cranial  segments  are  assumed  as  representative  parameters  for  a  full  human  skull.  A  high-fidelity  numerical  model  of  the  skull  is  developed,  and  the  experimental  and  numerical  modal  properties  are  obtained  for  the  dry  and  degassed  bone  states  with  representative  vibration  modes  identified  and  compared.  In  the  second  study,  the  degassed  elastic  parameters  are  applied  to  analyze  the  transcranial  radiation  of  guided  waves,  which  in  recent  years  has  received  growing  interest,  by  means  of  time  transient  finite  element  simulations  and  submersed  experimental  results,  confirming  the  use  of  the  high-fidelity  modeling,  analysis,  and  parameter  identification  framework  presented  herein.
■590    ▼aSchool  code:  0078.
■650  4▼aSutures
■650  4▼aParameter  identification
■650  4▼aGeometry
■650  4▼aRadiation
■650  4▼aMechanical  engineering
■653    ▼aParameter  identification
■653    ▼aHuman  skull  dynamics
■690    ▼a0548
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17366014▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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