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Analysis and Experimental Investigation of Wave Propagation and Energy Transfer in Mechanical Rotator Metamaterials
Analysis and Experimental Investigation of Wave Propagation and Energy Transfer in Mechanical Rotator Metamaterials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260209102913
- ISBN
- 9798265405746
- DDC
- 621
- 저자명
- Fang, Lezheng.
- 서명/저자
- Analysis and Experimental Investigation of Wave Propagation and Energy Transfer in Mechanical Rotator Metamaterials
- 발행사항
- [Sl] : Georgia Institute of Technology, 2023
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- 형태사항
- 195 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Leamy, Michael.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
- 초록/해제
- 요약Research in the field of periodic structures and acoustic/elastic metamaterials is dedicated to comprehending and manipulating the propagation of waves and energy transfer in engineered materials characterized by periodic arrangements of unit cells. This organized arrangement governs wave behavior, imparting dispersive characteristics and frequency band structures, thereby inspiring the development of innovative devices and applications with improved functionalities, including wave filtering, acoustic cloaking, energy harvesting, and vibration isolation. Nonlinear periodic structures further advance this research by incorporating geometric or material nonlinearity, resulting in a wide range of amplitude-dependent wave phenomena, such as dispersion shifting, frequency conversion, and nonreciprocal energy transfer. This dissertation explores these diverse phenomena and interactions in nonlinear periodic structures through a comprehensive approach encompassing analytical, computational, and experimental methods. The research commences with an investigation of the nonreciprocal impulse response in an elastically linked, nonlinear, inplane rotator unit cell, demonstrating an effective approach for achieving passive targeted energy transfer. Building upon the rotational geometry's rich dynamics, two types of rotator lattices are designed, showcasing significantly different dispersion characteristics resulting from subtle differences in coupling locations. This leads to amplitude-dependent negative refraction at the interface between these lattices. The dissertation further delves into the morphing of the dispersion relationship through rotational geometry, yielding a stretchable rotator lattice capable of extreme acoustoelastic effects for reconfigurable directivity, refraction steering, on-demand signal time delay, and parametric amplification. Additionally, closed-form perturbation analyses are introduced for two specific cases: nonlinear evanescent waves and nonlinear transmission at the interface of linear-nonlinear periodic structures. The study of nonlinear evanescent waves unveils spatially varying attenuation in the nonlinear evanescent field and predicts an amplitude saturation effect in the presence of softening nonlinearity. The interface study extends the analysis to higher orders, revealing amplitude-dependent self-interaction patterns in the transmitted nonlinear waves, where the fundamental frequency exchanges energy with generated higher harmonics in space. The analytical findings are verified through numerical simulations and/or experimental demonstrations. This dissertation provides valuable insights into nonlinear wave dynamics and periodic structure designs, offering a pathway for next-generation wave-based devices with potential applications in targeted energy transfer, elastic/acoustic imaging, and reconfigurable wave guiding and filtering.
- 일반주제명
- Energy
- 일반주제명
- Parameter identification
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260209102913
■006m o d
■007cr#unu||||||||
■020 ▼a9798265405746
■035 ▼a(MiAaPQ)AAI32316183
■035 ▼a(MiAaPQ)GeorgiaTech72730
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621
■1001 ▼aFang, Lezheng.
■24510▼aAnalysis and Experimental Investigation of Wave Propagation and Energy Transfer in Mechanical Rotator Metamaterials
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a195 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Leamy, Michael.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2023.
■520 ▼aResearch in the field of periodic structures and acoustic/elastic metamaterials is dedicated to comprehending and manipulating the propagation of waves and energy transfer in engineered materials characterized by periodic arrangements of unit cells. This organized arrangement governs wave behavior, imparting dispersive characteristics and frequency band structures, thereby inspiring the development of innovative devices and applications with improved functionalities, including wave filtering, acoustic cloaking, energy harvesting, and vibration isolation. Nonlinear periodic structures further advance this research by incorporating geometric or material nonlinearity, resulting in a wide range of amplitude-dependent wave phenomena, such as dispersion shifting, frequency conversion, and nonreciprocal energy transfer. This dissertation explores these diverse phenomena and interactions in nonlinear periodic structures through a comprehensive approach encompassing analytical, computational, and experimental methods. The research commences with an investigation of the nonreciprocal impulse response in an elastically linked, nonlinear, inplane rotator unit cell, demonstrating an effective approach for achieving passive targeted energy transfer. Building upon the rotational geometry's rich dynamics, two types of rotator lattices are designed, showcasing significantly different dispersion characteristics resulting from subtle differences in coupling locations. This leads to amplitude-dependent negative refraction at the interface between these lattices. The dissertation further delves into the morphing of the dispersion relationship through rotational geometry, yielding a stretchable rotator lattice capable of extreme acoustoelastic effects for reconfigurable directivity, refraction steering, on-demand signal time delay, and parametric amplification. Additionally, closed-form perturbation analyses are introduced for two specific cases: nonlinear evanescent waves and nonlinear transmission at the interface of linear-nonlinear periodic structures. The study of nonlinear evanescent waves unveils spatially varying attenuation in the nonlinear evanescent field and predicts an amplitude saturation effect in the presence of softening nonlinearity. The interface study extends the analysis to higher orders, revealing amplitude-dependent self-interaction patterns in the transmitted nonlinear waves, where the fundamental frequency exchanges energy with generated higher harmonics in space. The analytical findings are verified through numerical simulations and/or experimental demonstrations. This dissertation provides valuable insights into nonlinear wave dynamics and periodic structure designs, offering a pathway for next-generation wave-based devices with potential applications in targeted energy transfer, elastic/acoustic imaging, and reconfigurable wave guiding and filtering.
■590 ▼aSchool code: 0078.
■650 4▼aEnergy
■650 4▼aParameter identification
■690 ▼a0791
■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=T17366009▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
