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Design and Control of an Active Mech...

Yang, Lisheng,

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Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion // Lisheng Yang.
Author:	Yang, Lisheng,
Description:	1 electronic resource (171 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
Contained By:	Dissertations Abstracts International87-03B.
Subject:	Engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=32272025
ISBN:	9798291569528

Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion /
Yang, Lisheng,

Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion /Lisheng Yang. - 1 electronic resource (171 pages)

Source: Dissertations Abstracts International, Volume: 87-03, Section: B.

Ocean 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.

English

ISBN: 9798291569528Subjects--Topical Terms:

586835
Engineering.
Subjects--Index Terms:

Marine renewable energy

Design and Control of an Active Mechanical Motion Rectifier Power Take-Off for Wave Energy Conversion /
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500 $a Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
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502 $b Ph.D. $c University of Michigan $d 2025.
520 $a Ocean 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.
546 $a English
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650 4 $a Engineering. $3 586835
650 4 $a Naval engineering. $3 3173824
650 4 $a Mechanical engineering. $3 649730
653 $a Marine renewable energy
653 $a Wave energy converter
653 $a Switching system optimal control
653 $a Wave tank tests
690 $a 0537
690 $a 0548
690 $a 0468
710 2 $a University of Michigan. $b Naval Architecture & Marine Engineering. $e degree granting institution. $3 3816900
720 1 $a Zuo, Lei $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 87-03B.
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791 $a Ph.D.
792 $a 2025
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