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Exploiting Non-linearity to Improve ...

Khasawneh, Mohammad Ahmad.

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Exploiting Non-linearity to Improve the Performance of Point Wave Energy Absorbers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Exploiting Non-linearity to Improve the Performance of Point Wave Energy Absorbers./
作者:	Khasawneh, Mohammad Ahmad.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	205 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
Contained By:	Dissertations Abstracts International85-05B.
標題:	Mechanical engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30637655
ISBN:	9798380855846

Exploiting Non-linearity to Improve the Performance of Point Wave Energy Absorbers.
Khasawneh, Mohammad Ahmad.

Exploiting Non-linearity to Improve the Performance of Point Wave Energy Absorbers. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 205 p.

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

Thesis (Ph.D.)--New York University Tandon School of Engineering, 2023.

This item must not be sold to any third party vendors.

The heaving point wave energy absorber (PWA) has emerged as the most popular and promising solution for harnessing wave energy. This technology currently occupies 40\\% of the market share and is favored over other types of wave energy absorbers due to its simplicity, efficiency, and scalability. In its most basic form, a PWA consists of a partially submerged buoy connected to a linear electromagnetic generator by a rigid cable that is fixed to the seabed. When sea waves set the buoy into motion, the cable is pulled and relative motion is created between a magnet and a coil, generating a current in the coil as per Faraday's law of induction.Despite their success, PWAs still face two major challenges that, when resolved, can make them the ideal choice for wave energy generation. First, current PWAs are resonance-based and, therefore, operate efficiently only within the resonance bandwidth of the absorber. This happens when the natural frequency of the absorber is close to one of the dominant frequencies in the wave energy spectrum. However, because of the high stiffness of the hydrostatic restoring force resulting from buoyancy, the natural frequency of the absorber is typically higher than that of the dominant frequencies in the wave energy spectrum. As a result, to reduce its natural frequency, the absorber must be augmented with a heavy submerged body or other complex mechanical and control solutions. Second, even when incorporating the proper design means to reduce the frequency of the PWA, much of the available wave energy is still lost. This is because the resonant bandwidth of the PWA is much narrower than the spectrum of the incident waves whose energy is distributed over a wide range of frequencies.To address these issues, this dissertation aims to intentionally introduce nonlinearities into the design of PWAs and exploit their influence to develop broadband PWAs whose response is less sensitive to variations in the wave frequency. The proposed research is twofold. The first is concerned with the development, analysis, and testing of a novel PWA concept that utilizes nonlinear modal interactions, specifically a two-to-one internal resonance energy pump to achieve a broadband frequency response. The second builds upon the current literature, which deals with utilizing a bi-stable restoring force to improve the transduction of PWAs. While a few papers have discussed this concept through numerical simulations, none addressed it using analytical and experimental tools. Analytical tools will pave the way towards optimizing the design parameters for enhanced performance, while experiments will serve to validate the notion that bi-stability can indeed be used to improve the performance of PWAs. This work serves to fill these two gaps by analyzing the response of bi-stable PWAs using analytical tools and building a proper experimental testbed to assess their performance under real harmonic wave conditions.By addressing these issues, this research is expected to lead to a step-change in the performance limits of current PWAs, making the technology more viable. It will also contribute significantly to delineating the influence of nonlinearities on the performance of PWAs, leading to more efficious wave energy harvesting systems.

ISBN: 9798380855846Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Bi-stability

Exploiting Non-linearity to Improve the Performance of Point Wave Energy Absorbers.
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500 $a Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
500 $a Advisor: Daqaq, Mohammed F.
502 $a Thesis (Ph.D.)--New York University Tandon School of Engineering, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a The heaving point wave energy absorber (PWA) has emerged as the most popular and promising solution for harnessing wave energy. This technology currently occupies 40\\% of the market share and is favored over other types of wave energy absorbers due to its simplicity, efficiency, and scalability. In its most basic form, a PWA consists of a partially submerged buoy connected to a linear electromagnetic generator by a rigid cable that is fixed to the seabed. When sea waves set the buoy into motion, the cable is pulled and relative motion is created between a magnet and a coil, generating a current in the coil as per Faraday's law of induction.Despite their success, PWAs still face two major challenges that, when resolved, can make them the ideal choice for wave energy generation. First, current PWAs are resonance-based and, therefore, operate efficiently only within the resonance bandwidth of the absorber. This happens when the natural frequency of the absorber is close to one of the dominant frequencies in the wave energy spectrum. However, because of the high stiffness of the hydrostatic restoring force resulting from buoyancy, the natural frequency of the absorber is typically higher than that of the dominant frequencies in the wave energy spectrum. As a result, to reduce its natural frequency, the absorber must be augmented with a heavy submerged body or other complex mechanical and control solutions. Second, even when incorporating the proper design means to reduce the frequency of the PWA, much of the available wave energy is still lost. This is because the resonant bandwidth of the PWA is much narrower than the spectrum of the incident waves whose energy is distributed over a wide range of frequencies.To address these issues, this dissertation aims to intentionally introduce nonlinearities into the design of PWAs and exploit their influence to develop broadband PWAs whose response is less sensitive to variations in the wave frequency. The proposed research is twofold. The first is concerned with the development, analysis, and testing of a novel PWA concept that utilizes nonlinear modal interactions, specifically a two-to-one internal resonance energy pump to achieve a broadband frequency response. The second builds upon the current literature, which deals with utilizing a bi-stable restoring force to improve the transduction of PWAs. While a few papers have discussed this concept through numerical simulations, none addressed it using analytical and experimental tools. Analytical tools will pave the way towards optimizing the design parameters for enhanced performance, while experiments will serve to validate the notion that bi-stability can indeed be used to improve the performance of PWAs. This work serves to fill these two gaps by analyzing the response of bi-stable PWAs using analytical tools and building a proper experimental testbed to assess their performance under real harmonic wave conditions.By addressing these issues, this research is expected to lead to a step-change in the performance limits of current PWAs, making the technology more viable. It will also contribute significantly to delineating the influence of nonlinearities on the performance of PWAs, leading to more efficious wave energy harvesting systems.
590 $a School code: 1988.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Engineering. $3 586835
650 4 $a Alternative energy. $3 3436775
653 $a Bi-stability
653 $a Modal interactions
653 $a Nonlinear dynamics
653 $a Point wave energy absorbers
653 $a Wave energy
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690 $a 0363
710 2 $a New York University Tandon School of Engineering. $b Mechanical & Aerospace Engineering. $3 3698952
773 0 $t Dissertations Abstracts International $g 85-05B.
790 $a 1988
791 $a Ph.D.
792 $a 2023
793 $a English
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