Evolution Trend Research of Global Ocean Power Generation Based on a 45-Year Scientometric Analysis

Chen, Lisu; Li, Wei; Li, Jie; Fu, Qiang; Wang, Tianzhen

doi:10.3390/jmse9020218

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…Bibliometrics is an objective and quantitative method of researching and analyzing data obtained from databases [32][33][34][35][36]. CiteSpace is an information visualization software that can be used to scientifically analyze literature and extract pertinent information [37].…”

Section: Introductionmentioning

confidence: 99%

Development Trends, Current Hotspots, and Research Frontiers of Oyster Reefs: A Bibliometric Analysis Based on CiteSpace

Cheng,

Lu,

Sun

et al. 2023

Water

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The ocean is the largest reservoir on Earth. With the scarcity of water resources, the destruction of the benign cycle of the marine ecosystem would seriously impact people’s quality of life and health. Oyster reefs, the world’s most endangered marine ecosystems, have been recognized as a global issue due to their numerous essential ecological functions and provision of various ecosystem services. As a result, interest in oyster reef research has been steadily increasing worldwide in recent decades. The goal of this study is to assess the knowledge structure, development trends, research hotspots, and frontier predictions of the global oyster reef research field. Based on 1051 articles selected from the Web of Science Core Collection from 1981 to 2022, this paper conducted a visual analysis of oyster reef ecosystems conservation, restoration, and management. Specifically, it examined research output characteristics, research cooperation networks, highly cited papers and core journals, and keywords. Results indicate a steady rise in research interest in oyster reefs over the past 40 years, with notable acceleration after 2014. Authoritative experts and high-impact organizations were also identified. This paper outlines habitat conservation and restoration, ecosystem services, and the impacts of climate change as the primary research hotspots and frontiers. This paper provides valuable guidance for scholars and regulators concerned about oyster reef conservation to conduct research on oyster reefs.

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Section: Introductionmentioning

confidence: 99%

Development Trends, Current Hotspots, and Research Frontiers of Oyster Reefs: A Bibliometric Analysis Based on CiteSpace

Cheng,

Lu,

Sun

et al. 2023

Water

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“…In recent years, ocean energy has attracted more attention due to its reproducibility, cleanness, and vast reserves [1,2]. Ocean energy includes wave energy, tidal energy, and ocean current energy [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Layering Linear Discriminant Analysis-Based Fault Diagnosis Method for Grid-Connected Inverter

Jin

Wang

Zhou

et al. 2022

JMSE

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Grid-connected inverters are the core equipment for connecting marine energy power generation systems to the public electric utility. The variation of current sensor fault severity will make fault samples multimodal. However, linear discriminant analysis assumes that the same fault is independent and identically distributed. To solve this problem, this paper proposes a layering linear discriminant analysis method based on traditional linear discriminant analysis. The proposed method divides the historical fault data based on the sensor fault severity layer-by-layer until the distribution of the same fault category in each subset is very close. Linear discriminant analysis is used to analyze historical fault data in each subgroup, and the kappa coefficient is applied as the basis for ending the training process. A BP neural network is employed to estimate the fault severity during the testing process, and the fault diagnosis sub-model is selected. The proposed method enables the accurate diagnosis of faults with different distributions in the same category and provides an accurate estimate of the sensor’s fault severity degree. The estimated value of the sensor’s fault degree can provide critical information for the maintenance of the equipment and can be used to correct the sensor’s output.

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“…Each of these energy resources is distributed globally. Tidal current energy, utilizing tides, is predictable many years in advance, which provides a reliable resource with significantly greater in its energy density compared to other renewable energy [2,3]. In addition, tidal current energy allows designers to limit visual exposure, acoustic disturbances and to reduce environmental impacts.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Performance Analysis of a Rim-Driven Turbine in Real Flow Conditions

Song

Kang

2022

JMSE

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The tidal turbines represent a new frontier for extracting energy from tides source. Despite the technology being mature, new solutions aimed at improving performance, reliability with reduced environmental impact, manufacturing and installation costs are currently under investigation. The Rim-driven turbine (abbreviated as RDT) was recently proposed. A RDT resembles a ducted turbine (abbreviated as DT), as both contain blades and a duct. The present study aims at investigating the detail performance and flow field of a RDT in a real flow based on the China Zhaitang Island’s tidal current data. To show the difference between the RDT and DT, simulations are also performed on the corresponding DT. It is found that the power and thrust for the two configurations exhibit time-periodic behavior that is consistent with the wave frequency. At axial flow, the fluctuation amplitude on the power and thrust increase with the increase of tip speed ratio. The RDT has higher power output when operating at lower tip speed ratio and has a potential reduction in flow resistance and disturbance with respect to the DT. At yawed flow, the fluctuation amplitude on the power and thrust decrease with the increase of yaw angle. The RDT has less capable of compensating the effect of yawed inflow in reducing the power than the DT at larger yaw angle. In addition, the power and thrust generates micro-amplitude fluctuation integrated into the main waveform, which the frequency is consistent with the turbine rotation frequency. The wake characteristics analysis reveals that the yawed flow field is more turbulent, and the two configurations suffer strong unsteady flow separation along the whole span. Strong interactions are observed between the rotor’s main wake and the duct’s upper wake. The yaw angle primarily determines the downstream wake deflection direction and significantly changes the wake shape and vortex structures. Meanwhile, the wake flow is found to recover more quickly at larger yaw angle. Besides, due to the open-center of RDT, a part free-stream flow is allowed to travel through and forms an obvious high velocity zone. The presence of open-center of RDT has avoided the low velocity zone, improved the wake structure and accelerated wakes recover, which seems to give an advantageous effect in operating a RDT.

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Evolution Trend Research of Global Ocean Power Generation Based on a 45-Year Scientometric Analysis

Cited by 11 publications

References 43 publications

Development Trends, Current Hotspots, and Research Frontiers of Oyster Reefs: A Bibliometric Analysis Based on CiteSpace

Development Trends, Current Hotspots, and Research Frontiers of Oyster Reefs: A Bibliometric Analysis Based on CiteSpace

A Layering Linear Discriminant Analysis-Based Fault Diagnosis Method for Grid-Connected Inverter

A Numerical Performance Analysis of a Rim-Driven Turbine in Real Flow Conditions

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