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Computational and Experimental Investigation of Human Skull Dynamics
Computational and Experimental Investigation of Human Skull Dynamics
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260209102914
- ISBN
- 9798263396985
- DDC
- 000
- 저자명
- Kohtanen, Eetu.
- 서명/저자
- Computational and Experimental Investigation of Human Skull Dynamics
- 발행사항
- [Sl] : Georgia Institute of Technology, 2023
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- 형태사항
- 148 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Erturk, Alper.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
- 초록/해제
- 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.
- 일반주제명
- Sutures
- 일반주제명
- Parameter identification
- 일반주제명
- Geometry
- 일반주제명
- Radiation
- 일반주제명
- Mechanical engineering
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260209102914
■006m o d
■007cr#unu||||||||
■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.
