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Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion
Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105243
- ISBN
- 9798291569528
- DDC
- 620
- 저자명
- Yang, Lisheng.
- 서명/저자
- Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion
- 발행사항
- [Sl] : University of Michigan, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 171 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Zuo, Lei.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2025.
- 초록/해제
- 요약Ocean waves have high energy density and are persistent and predictable. Yet, converting wave energy to a usable form remains challenging. A major hurdle is the oscillatory nature of waves resulting in alternating loads, which necessitate the use of rectification at some stage of the energy conversion. This research effort presents a novel design of active mechanical motion rectifier (AMMR) for a wave energy converter (WEC) power take-off (PTO), which provides enhanced controllability and better power performance when compared to passive mechanical motion rectifiers (MMR). Inspired by transistors used in synchronous electrical rectifiers, the proposed design uses controllable electromagnetic clutches in the mechanical transmission to allow active engagement-disengagement control; thus, rectifying the oscillatory motion into a unidirectional rotation for high energy conversion efficiency and allowing the generator in unidirectional rotation to control the bidirectional wave capture structure for maximizing the power output. This design, although attractive, brings substantial obstacles to power evaluation with control in the loop. The alternating clutch engagement of the PTO leads to a switching dynamic system, which presents significant challenges to existing control optimization methods used for conventional linear systems. This dissertation proposes innovative methods to efficiently evaluate the power performance of WECs using an AMMR PTO. A semi-analytical scheme is developed to optimize power in regular waves with the assumption of symmetric clutch switching. Both feedback control and open-loop control parameterization can be integrated in this power evaluation scheme, providing a versatile tool for performing control co-design of the AMMR PTO parameters. The method is used in case studies of an oscillating surge WEC. Both wave power capture and electrical power output potentials of the WEC are investigated for different generator inertia values. In addition, another method for approximating the optimal control of PTO switching instants and generator torque in irregular waves is developed. Building on the dynamic programming principle, this method provides a tractable and flexible numerical framework for optimizing the hybrid control of discrete switching and continuous torque. Simulations are conducted to examine the optimal control patterns and numerical approximation effects. To validate the design functionality and numerical power analysis results, two PTO prototypes of different scales are fabricated and tested extensively. Wave tank tests of the small-scale PTO demonstrate the AMMR PTO increases power capture significantly for long wave periods. Hardware-in-loop tests of the small-scale and large-scale PTO demonstrate the proposed regular wave and irregular wave control methods can be implemented in real-time controllers. With unidirectional load constraints in the experiments, the AMMR PTO shows 10-120% power enhancement compared to a conventional mechanical PTO.
- 일반주제명
- Engineering
- 일반주제명
- Naval engineering
- 일반주제명
- Mechanical engineering
- 키워드
- Wave tank tests
- 기타저자
- University of Michigan Naval Architecture & Marine Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105243
■006m o d
■007cr#unu||||||||
■020 ▼a9798291569528
■035 ▼a(MiAaPQ)AAI32272025
■035 ▼a(MiAaPQ)umichrackham006383
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620
■1001 ▼aYang, Lisheng.
■24510▼aDesign and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion
■260 ▼a[Sl]▼bUniversity of Michigan▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a171 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Zuo, Lei.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2025.
■520 ▼aOcean waves have high energy density and are persistent and predictable. Yet, converting wave energy to a usable form remains challenging. A major hurdle is the oscillatory nature of waves resulting in alternating loads, which necessitate the use of rectification at some stage of the energy conversion. This research effort presents a novel design of active mechanical motion rectifier (AMMR) for a wave energy converter (WEC) power take-off (PTO), which provides enhanced controllability and better power performance when compared to passive mechanical motion rectifiers (MMR). Inspired by transistors used in synchronous electrical rectifiers, the proposed design uses controllable electromagnetic clutches in the mechanical transmission to allow active engagement-disengagement control; thus, rectifying the oscillatory motion into a unidirectional rotation for high energy conversion efficiency and allowing the generator in unidirectional rotation to control the bidirectional wave capture structure for maximizing the power output. This design, although attractive, brings substantial obstacles to power evaluation with control in the loop. The alternating clutch engagement of the PTO leads to a switching dynamic system, which presents significant challenges to existing control optimization methods used for conventional linear systems. This dissertation proposes innovative methods to efficiently evaluate the power performance of WECs using an AMMR PTO. A semi-analytical scheme is developed to optimize power in regular waves with the assumption of symmetric clutch switching. Both feedback control and open-loop control parameterization can be integrated in this power evaluation scheme, providing a versatile tool for performing control co-design of the AMMR PTO parameters. The method is used in case studies of an oscillating surge WEC. Both wave power capture and electrical power output potentials of the WEC are investigated for different generator inertia values. In addition, another method for approximating the optimal control of PTO switching instants and generator torque in irregular waves is developed. Building on the dynamic programming principle, this method provides a tractable and flexible numerical framework for optimizing the hybrid control of discrete switching and continuous torque. Simulations are conducted to examine the optimal control patterns and numerical approximation effects. To validate the design functionality and numerical power analysis results, two PTO prototypes of different scales are fabricated and tested extensively. Wave tank tests of the small-scale PTO demonstrate the AMMR PTO increases power capture significantly for long wave periods. Hardware-in-loop tests of the small-scale and large-scale PTO demonstrate the proposed regular wave and irregular wave control methods can be implemented in real-time controllers. With unidirectional load constraints in the experiments, the AMMR PTO shows 10-120% power enhancement compared to a conventional mechanical PTO.
■590 ▼aSchool code: 0127.
■650 4▼aEngineering
■650 4▼aNaval engineering
■650 4▼aMechanical engineering
■653 ▼aMarine renewable energy
■653 ▼aWave energy converter
■653 ▼aSwitching system optimal control
■653 ▼aWave tank tests
■690 ▼a0537
■690 ▼a0548
■690 ▼a0468
■71020▼aUniversity of Michigan▼bNaval Architecture & Marine Engineering.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359969▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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