Related references
Note: Only part of the references are listed.
Article
Thermodynamics
Boyang Li et al.
Summary: This paper investigates the effects of distance between floating bodies on energy conversion through 2-dimensional simulations of spring-mounted floating bodies. The average amplitude, average power, and energy conversion efficiency of three floating bodies are discussed separately. It is observed that as the distance increases, the interaction between floating bodies decreases. However, when the distance is small, the interaction between floating bodies can have a positive impact on energy conversion. The power of the floating body increases with wave height until it reaches an optimal conversion efficiency, after which the power and efficiency decrease with increasing wave height.
Article
Green & Sustainable Science & Technology
Mile Dragic et al.
Summary: Sigma Energy has conducted initial prototype tests of a scaled wave energy converter (WEC) in an actual sea environment. The prototype, which consisted of a circular buoy, a mechanical power take-off (PTO) system, and a counterweight, was moored as a tension leg platform to the seabed with three equal tendons. The experiments measured and analyzed various characteristics of the device. This paper presents the sea trials, with a focus on the device's power and efficiency. The study calculated the power based on data recorded at six locations along the PTO system, revealing a decay of capture width ratio (CWR) and the losses of the main elements of the PTO system. The optimal sea and loading conditions were determined, explaining the highest efficiencies achieved and discussing the challenges in predicting them. The paper also presents the long-term average values of the efficiencies, encompassing all the tests performed and accounting for different sea conditions.
Article
Thermodynamics
Binzhen Zhou et al.
Summary: By studying a hybrid system consisting of a semi-submersible platform and heaving point absorber wave energy converters (WECs), this research has found that a new prominent power peak occurs in the so-called synchronized mode regardless of the layout of the WECs. In this mode, the power of a single WEC can increase by up to 41.4% and the total power by up to 26.7%, but the heave motion of the platform increases. The WECs have a small impact on the surge motion and pitch motion of the platform except for near the synchronized mode frequency, where they reduce the resonant heave motion at the natural frequency. This study provides valuable insights into the dynamic and power performance of wind-wave hybrid systems, offering detailed configurations and potential guidance for practical design and application.
Article
Thermodynamics
Binzhen Zhou et al.
Summary: Deploying a cylindrical heaving wave energy converter (WEC) in front of a parabolic breakwater forms a basic module for synergetic coast protection and power generation. The power amplification effect of the parabolic breakwater on the WEC and the additional wave attenuation effect of the WEC on the parabolic breakwater are investigated. Numerical studies show that the parabolic breakwater has similar power amplification effects on different WECs, and a flatter WEC with a larger diameter-to-draft ratio is recommended.
Article
Green & Sustainable Science & Technology
Jarrah Orphin et al.
Summary: This study examines limitations and uncertainties due to scale effects in model test experiments of wave energy converters. It finds significant differences in incident waves and loads across scales, primarily related to scale-dependent parameters.
Article
Thermodynamics
Gianmaria Giannini et al.
Summary: The design of a wave energy converter (WEC) is a crucial task that requires consideration of hydrodynamic performance, structural reliability, and economic feasibility. This study proposes a new methodology that integrates these aspects in the early development stages, aiming to achieve a viable pre-design solution.
Article
Thermodynamics
Jinming Wu et al.
Summary: This study examines a wave energy converter (WEC) that utilizes an internal inverted pendulum to provide reaction forces for power absorption. Compared to a normal pendulum, this converter has a naturally high internal mass, giving it potential advantages. Optimal structural configurations of the converter are determined using a genetic algorithm, and the equations of motion are solved using a linearized model that is validated through experiments and a non-linearized model. The results show that the inverted pendulum WEC offers several advantages over a normal pendulum WEC in most sea states.
Article
Thermodynamics
Zechen He et al.
Summary: This study presents a parameter optimization method based on submerged buoy volume for an oscillating buoy-type wave energy converter. The effects of submerged buoy volume on power capture are investigated, and the cost-effectiveness of the optimized wave energy converters is measured. The results show that a wave energy converter with large power take-off damping has good adaptability to wave frequencies, but the optimal submerged buoy volume may not be cost-efficient.
Article
Thermodynamics
Meysam Shahabi-Nejad et al.
Summary: This research aims to introduce and investigate an onshore Hybrid Wave Energy Converter (HWEC) and examines the performance and the influence of some geometric parameters on its performance through numerical simulation.
Article
Energy & Fuels
Baocheng Zhang et al.
Summary: This study proposes an optimization process to improve the energy-harvesting efficiency of point-absorber wave energy converters (WECs) and enhance the utilization of wave energy resources. By adopting the multidisciplinary design optimization integration system ISIGHT, an optimization design flow for the shape parameters of point-absorber WECs is established. The motion equations of the WECs are derived based on potential flow theory, and an optimization function is used to modify the WECs to improve their energy-capture efficiency. The results show that a cylindrical-bottom point-absorber WEC with specific dimensions has optimal performance and maximum energy capture capacity.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Marine
Jian Tan et al.
Summary: This paper proposes an adjustable draft system for downsizing the Power Take-Off (PTO) capacity of Wave Energy Converters (WECs). The system allows control of the excitation force and adapts the natural frequency, leading to improved power absorption.
Article
Green & Sustainable Science & Technology
M. Kamarlouei et al.
Summary: This study presents a solution based on wave energy converters to control the pitching motions of an offshore wind turbine floating platform. The experimental results indicate that the solution can control the platform motions but needs further optimization for better performance. These findings also provide design knowledge for testing the concept on wind turbines with higher rated power.
Article
Green & Sustainable Science & Technology
Jarrah Orphin et al.
Summary: Reproducing a model experiment of a WEC in two laboratories revealed significant differences between laboratories in incident waves and capture width ratio, primarily due to parameters associated with the test environment and the model. Laboratory effects, especially in the presence of nonlinearities, should be taken into account in WEC model test experiments.
Article
Energy & Fuels
Shuo Chen et al.
Summary: This paper presents the design and dynamics of a Hybrid Wave-Current Energy Converter (HWCEC), which can convert both wave and current energy to electricity simultaneously, improving power output and reducing the Peak to Average Ratio (PAR).
Article
Energy & Fuels
Shuo Chen et al.
Summary: The paper presents the design and dynamics of a Hybrid Wave-Current Energy Converter (HWCEC) and shows through water basin tests its advantages in improving electric power output and reducing the Peak to Average Ratio (PAR).
Article
Engineering, Marine
Yulin Si et al.
Summary: A hybrid floating wind and wave power generation platform was proposed, incorporating wave energy converters into floating offshore wind turbines to potentially reduce energy costs. Different control strategies for the wave energy converters were studied, showing significant impacts on platform dynamics and power generation. The optimal control design for WECs attached to fixed structures may not be suitable for the combined floating wind and wave energy production platform, warranting further investigation.
Article
Engineering, Ocean
P. K. Stansby et al.
APPLIED OCEAN RESEARCH
(2020)
Article
Energy & Fuels
Jianjian Hu et al.
Article
Engineering, Mechanical
Hanbin Gu et al.
JOURNAL OF FLUIDS AND STRUCTURES
(2018)
Article
Engineering, Ocean
Peter Stansby et al.
APPLIED OCEAN RESEARCH
(2017)
Article
Green & Sustainable Science & Technology
P. Stansby et al.
Review
Green & Sustainable Science & Technology
Iraide Lopez et al.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2013)
Review
Fisheries
Xinjun Chen et al.
FISHERIES RESEARCH
(2008)
