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Finite Element Model Updating of Exponential Non-Viscous Damping Systems
Finite Element Model Updating of Exponential Non-Viscous Damping Systems
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260209102903
- ISBN
- 9798265400918
- DDC
- 658
- 저자명
- Otsuki, Yu.
- 서명/저자
- Finite Element Model Updating of Exponential Non-Viscous Damping Systems
- 발행사항
- [Sl] : Georgia Institute of Technology, 2023
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- 형태사항
- 303 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Wang, Yang.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
- 초록/해제
- 요약Finite element (FE) models are mathematical representations that simulate the physical behavior of various engineering systems. The majority of engineering structural models employ viscous damping due to its mathematical simplicity. However, significant differences can exist between the actual damping behavior of structural systems and the prediction of a viscous damping model. Alternatively, "non-viscous damping", which uses a kernel function and a convolutional integral in the equation of motion, has been proposed to incorporate time-hysteresis damping effects that are absent in viscous damping. Compared to undamped or viscous damping systems, there have been very limited studies on the FE model updating of non-viscous damping systems, especially in their practical applications and validations with real-world as-built structures. The objective of this thesis is to develop diverse approaches for FE model updating of non-viscous damping systems using exponential kernel functions. Additionally, the thesis performs experimental validation and comparison between the proposed non-viscous damping approaches and conventional viscous damping approaches.With the time-domain approach, this research first investigates various aspects of the estimation problem for non-viscous damping systems compared to viscous damping systems, employing both recursive and batch Bayesian estimation methods. Comparative studies between the recursive and batch approaches provide valuable insights into their estimation performance. When using the frequency-domain approach, this thesis proposes an optimization formulation for updating stiffness and damping parameters in non-proportional and exponential non-viscous damping systems. The proposed formulation utilizes complex eigenvalues and eigenvectors based on findings from system identification studies. The analytical gradient of the proposed optimization formulation is derived to improve computational efficiency, allowing its application to large-scale structures. Experimental validation and comparison between viscous and non-viscous damping approaches are conducted on a four-story structure and a full-scale steel pedestrian bridge located at the Georgia Institute of Technology.Motivated by the inadequacy of viscous damping in accurately representing actual damping phenomena of structural systems, this thesis introduces a new method to the field of FE model updating by incorporating non-viscous damping. This advancement allows for broader applications of non-viscous damping in a multitude of diverse engineering systems and enables more accurate characterization of their dynamic behaviors through the updated model.
- 일반주제명
- Behavior
- 일반주제명
- Fourier transforms
- 일반주제명
- Causality
- 일반주제명
- Energy dissipation
- 일반주제명
- Eigenvalues
- 일반주제명
- Deformation
- 일반주제명
- Viscoelasticity
- 일반주제명
- Eigenvectors
- 일반주제명
- Vibration
- 일반주제명
- Materials science
- 일반주제명
- Mathematics
- 일반주제명
- Mechanics
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798265400918
■035 ▼a(MiAaPQ)AAI32315554
■035 ▼a(MiAaPQ)GeorgiaTech75604
■040 ▼aMiAaPQ▼cMiAaPQ
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■1001 ▼aOtsuki, Yu.
■24510▼aFinite Element Model Updating of Exponential Non-Viscous Damping Systems
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a303 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Wang, Yang.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2023.
■520 ▼aFinite element (FE) models are mathematical representations that simulate the physical behavior of various engineering systems. The majority of engineering structural models employ viscous damping due to its mathematical simplicity. However, significant differences can exist between the actual damping behavior of structural systems and the prediction of a viscous damping model. Alternatively, "non-viscous damping", which uses a kernel function and a convolutional integral in the equation of motion, has been proposed to incorporate time-hysteresis damping effects that are absent in viscous damping. Compared to undamped or viscous damping systems, there have been very limited studies on the FE model updating of non-viscous damping systems, especially in their practical applications and validations with real-world as-built structures. The objective of this thesis is to develop diverse approaches for FE model updating of non-viscous damping systems using exponential kernel functions. Additionally, the thesis performs experimental validation and comparison between the proposed non-viscous damping approaches and conventional viscous damping approaches.With the time-domain approach, this research first investigates various aspects of the estimation problem for non-viscous damping systems compared to viscous damping systems, employing both recursive and batch Bayesian estimation methods. Comparative studies between the recursive and batch approaches provide valuable insights into their estimation performance. When using the frequency-domain approach, this thesis proposes an optimization formulation for updating stiffness and damping parameters in non-proportional and exponential non-viscous damping systems. The proposed formulation utilizes complex eigenvalues and eigenvectors based on findings from system identification studies. The analytical gradient of the proposed optimization formulation is derived to improve computational efficiency, allowing its application to large-scale structures. Experimental validation and comparison between viscous and non-viscous damping approaches are conducted on a four-story structure and a full-scale steel pedestrian bridge located at the Georgia Institute of Technology.Motivated by the inadequacy of viscous damping in accurately representing actual damping phenomena of structural systems, this thesis introduces a new method to the field of FE model updating by incorporating non-viscous damping. This advancement allows for broader applications of non-viscous damping in a multitude of diverse engineering systems and enables more accurate characterization of their dynamic behaviors through the updated model.
■590 ▼aSchool code: 0078.
■650 4▼aBehavior
■650 4▼aFourier transforms
■650 4▼aCausality
■650 4▼aEnergy dissipation
■650 4▼aEigenvalues
■650 4▼aDeformation
■650 4▼aViscoelasticity
■650 4▼aEigenvectors
■650 4▼aVibration
■650 4▼aMaterials science
■650 4▼aMathematics
■650 4▼aMechanics
■690 ▼a0543
■690 ▼a0794
■690 ▼a0405
■690 ▼a0346
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17365958▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


