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- Journal Article:
Sun et al.
A floating breakwater can significantly reduce the wave invasion of marine structures and provide a safe construction environment and service environment for wave attenuation protection for marine structures. With the development and utilization of marine resources, the application of floating breakwaters in engineering is becoming more and more important; research on integrated systems of a…
- Conference Paper:
Mundon et al.
This paper presents a hybrid drivetrain concept developed specifically for wave energy applications. The drivetrain comprises a hydrostatic hydraulic front end coupled to Vernier linear generator in such a fashion as to provide the advantages of both a hydraulic drivetrain and a direct-drive electrical system, while improving on the efficiency of both. In addition to the concept and…
- Journal Article:
Gaspar et al.
This paper presents a power take-off concept for the Moored, Multi-float and Multi-Mode Wave Energy Converter, (M4 WEC), based on oil hydraulic technology. The study shows the importance of having low max-to-mean mechanical power ratios, preliminary to the design of the oil-hydraulic power take-off. It explores the characteristics of the M4 WEC in order to achieve these lower power ratios and…
- Conference Paper:
Lin et al.
This paper describes a novel design of a wave energy harvest device that utilizes a flywheel energy storage (FES) system to yield increased power generation. The buoy design is moored to the ocean floor via a cable; as the buoy is heaved vertically by ocean waves, the cable rotates a pulley which in turn drives the rotor of an onboard generator. A ratchet within the pulley allows the rotor to…
- Journal Article: Brito et al.
Numerical Model of Constrained Wave Energy Hyperbaric Converter under Full-Scale Sea Wave Conditions
A 2D numerical investigation of the power absorption of a constrained wave energy hyperbaric converter (WEHC) under full-scale sea wave conditions is presented. A fully non-linear numerical model DualSPHysics, based on the coupling of a smoothed particle hydrodynamics (SPH) fluid solver with a multibody dynamics solver, is used to model the interaction between wave and WEHC sub-systems. The…
- Presentation:
Vivekanandan et al.
The capabilities of marine vehicles, such as autonomous underwater vehicles (AUVs) and remotely-operated vehicles (ROVs), have significantly advanced to perform complicated operations such as navigating through unexplored and dynamic environments, inspection of underwater structures, and monitoring of ocean conditions in deep waters. However, the limited energy resources of AUVs and tethered…
- Presentation:
Lee et al.
The hull geometry of a wave energy converter (WEC) is central to the absorption of wave energy and its conversion to mechanical energy. Reduced-order models for WECs, such as WEC-Sim, rely on boundary element methods to predict excitation, radiation damping, and added mass for a given geometry, but there is limited experimental validation of prediction accuracy. We investigate this in the…
- Presentation:
Rusch et al.
In-water testing demonstrated the feasibility of a combined wave energy converter - uncrewed underwater vehicle system (WEC-UUV). This project aims to show that wave energy converters can act as the power source and charging station for remotely operated underwater vehicles. The main project objectives are to 1) show the capability of this WEC to power and support remote operation and docking…
- Journal Article:
Zhou et al.
A hybrid system integrating a power take-off (PTO) system into a floating breakwater is a promising candidate for both shoreline protection and commercial wave energy extraction. Although geometric asymmetry is important to such PTO-integrated breakwaters, its role in energy conversion efficiency and wave attenuation is poorly understood. In this study, a two-dimensional semi-analytical model…
- Journal Article:
Gong et al.
In this paper, an active optimization method of a wave energy converter (WEC) array that focuses on the characteristics of the random sea condition is proposed. Physical model tests were conducted in both regular and irregular wave conditions. Three representative regular wave cases were determined from the target wave spectrum using the method. A rigid cylindrical heaving buoy model with…
- Conference Paper:
Schiavon et al.
Inertial Sea Wave Energy Converters (ISWEC) convert waves motion into electricity exploiting the conservation of angular momentum principle. The energy transported by the waves depends mainly by the period and the height that change over the time. For this reason, in order to maximize the energy extracted by the WEC, the internal gyroscope rotation speed and the torque applied to the generator…
- Journal Article:
Lu et al.
The power capture performance of an interconnected two-raft wave energy converter (WEC) is investigated in this paper. The equations of motion for the hinged WEC are established using a discrete-module-beam-bending based hydroelasticity method. A mathematical model is then derived for the optimization of power-take-off systems, which is capable of taking into account both different raft length…
- Report:
Bull and Ochs
This report considers and prioritizes the primary potential technical cost‐reduction pathways for offshore wave activated body attenuators designed for ocean resources. This report focuses on technical research and development cost‐ reduction pathways related to the device technology rather than environmental monitoring or permitting opportunities. Three sources of information were used to…
- Journal Article:
Castros-Santos et al.
This paper establishes a general methodology to calculate the life-cycle cost of floating offshore renewable energy devices, applying it to wave energy and wind energy devices. It is accounts for the contributions of the six main phases of their life-cycle: concept definition, design and development, manufacturing, installation, exploitation and dismantling, the costs of which have been…
- Conference Paper:
Apsley et al.
Wave energy is well known to be a renewable energy resource with worldwide capacity similar to wind. However there is to date negligible generation of electricity from wave. Many devices have been proposed without convergence on a particular design as there has been for wind. We are here concerned with a multi-float attenuator type M4 which has been widely tested in wave basins and modelled by…
- Journal Article:
Margheritini and Kofoed
This paper presents the details of a study performed to investigate the feasibility of a wave energy system made up of a number of Weptos wave energy converters (WECs) and sets of batteries, to provide the full energy demands of a small island in Denmark. Two different configurations with 2 and 4 Weptos machines respectively with a combined installed power of 750 kW (and a capacity factor of 0…
- Journal Article:
Wang et al.
For the physical model testing of wave energy converters (WECs) in the wave basin, it is necessary to test the models in a small number of sea states. Previously, the H – T binning method was widely used to determine the sea states that are representative of an ocean area. However, it omitted much useful information such as the wave directionality. In this paper, a…
- Journal Article:
Xia et al.
The permanent magnet linear generator is widely applied in the direct-drive wave energy converter (DD-WEC) because of its high power density. In this paper, a novel tubular permanent magnet linear generator, which consists of multilayer and interior permanent magnets (MI-TLPMGs), is presented for DD-WEC, which improves the output power and back electromotive force (back EMF) through the flux…
- Journal Article:
Li et al.
In this paper, a spring-mounted floating body was numerically investigated with 2-dimensional simulations to examine the effects of distance between floating bodies on the energy conversion. The average amplitude, average power and energy conversion efficiency of the three floating bodies are discussed separately at the end of the paper. With the increase of distance, the interaction between…
- Thesis:
Kumar
Renewable energy is a revolution in the field of power generation to ensure environment friendly alternatives to fossil fuels. Wave power is a huge source of renewable energy found in the ocean’s waves. In this research, the main objective is to extract maximum wave power from the near-shore waves in multiple degrees-of-freedom (DOF). In order to achieve this goal, a combination of design,…
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