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- Zheng et al.
This paper presents a dynamic analysis of a two-raft wave energy conversion device based on the three-dimensional wave radiation-diffraction method. The device consists of two hinged cylindrical rafts of elliptical cross section and a power take-off system at the joint. The effect of raft length, linear damping and spring coefficient in the power take off (PTO) system, axis ratio (ratio of…
- Gray et al.
Estimates for lifetime costs of wave energy arrays are difficult to obtain due to the uncertainty surrounding weather windows and failure rates for wave energy converters (WECs). An operations & maintenance (O&M) simulation tool has been used to assess the sensitivity of WEC failure rates on the profitability of a wave farm, with the Pelamis P2 device used as a case study. Two…
- Bedard et al.
This document describes the results of the system level conceptual design, performance and cost study of both a single unit deployment and a commercial-scale offshore wave power plant installed off the coast of San Francisco California. For purposes of this point design study, the selected single unit deployment site is within the boundaries of an exclusion zone in the Monterey Bay National…
- 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…
- Quitoras et al.
The Philippines is currently addressing its growing concerns on how to meet its ballooningenergy demandin parallel on having agood energymix in terms of itsrenewableand non-renewable resources. As of 2016, according to the Department of Energy (DOE) of the country, roughly 76% of the Philippines’ sources of energy came from fossil fuels and the remaining percent was mainly attributable to the…
- Nejad et al.
Wave energy as a predictable renewable energy, can be directly captured from surface wave, which has a significant power. Although the application of wave energy in recent years is rapidly increased all over the world especially in Europe, but there is a lack of research in this field in some developing countries. Hence, in this study a new research about potential of wave in Southern border…
- Rusu and Onea
The present work aims to provide a realistic picture of the efficiency along the European continental coasts of ten representative wave energy converters. The main coastal environments targeted are the western sides of Scandinavia, Ireland, UK, Iberian Peninsula and also the Mediterranean and Black seas. In order to evaluate the wave climate corresponding to these coastal areas, several…
- Santo et al.
This paper presents both linear and nonlinear analyses of extreme responses for a multi-body wave energy converter (WEC) in severe sea states. The WEC known as M4 consists of three cylindrical floats with diameters and draft which increase from bow to stern with the larger mid and stern floats having rounded bases so that the overall system has negligible drag effects. The bow and mid float…
- Drew et al.
Ocean waves are a huge, largely untapped energy resource, and the potential for extracting energy from waves is considerable. Research in this area is driven by the need to meet renewable energy targets, but is relatively immature compared to other renewable energy technologies. This review introduces the general status of wave energy and evaluates the device types that represent current wave…
- Zhang et al.
According to Newton’s Second Law and the microwave theory, mechanical analysis of multiple buoys which form Sharp Eagle wave energy converter (WEC) is carried out. The movements of every buoy in three modes couple each other when they are affected with incident waves. Based on the above, mechanical models of the WEC are established, which are concerned with fluid forces, damping forces, hinge…
- Zhang et al.
A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydraulic power take-off system, which suits for the floating wave energy devices, includes hydraulic system and power generation system. The hydraulic control system uses a special “self…
- Westphalen et al.
The suitability of computational fluid dynamics (CFD) for marine renewable energy research and development and in particular for simulating extreme wave interaction with a wave energy converter (WEC) is considered. Fully nonlinear time domain CFD is often considered to be an expensive and computationally intensive option for marine hydrodynamics and frequency-based methods are traditionally…
- Venugopal et al.
This study reports the practicalities of applying a numerical model to assess the wave energy extraction at proposed development sites in Orkney Waters, Scotland. A state-of-the-art phase averaged spectral wave model, MIKE 21 Spectral Wave, in association with the wave-structure interaction software tool WAMIT, has been employed to study the impact of energy extraction by large arrays of Wave…
- Rusu
The main objective of the present work was to assess and compare the wave power resources in various offshore and nearshore areas. From this perspective, three different groups of coastal environments were considered: the western Iberian nearshore, islands and an enclosed environment with sea waves, respectively. Some of the most representative existent wave converters were evaluated in the…
- Yu et al.
In this paper, we propose a novel wave energy converter (hereinafter called Wave Loong®) consisting of two rafts hinged at each raft end and one pendulum hung at the joint of the rafts. A mathematical model based on the linear wave theory with the consideration of three bodies hinged together and various connection conditions between any two of the three bodies is presented to investigate the…
- Ambühl et al.
More and more wave energy converter (WEC) concepts are reaching prototype level. Once the prototype level is reached, the next step in order to further decrease the levelized cost of energy (LCOE) is optimizing the overall system with a focus on structural and maintenance (inspection) costs, as well as on the harvested power from the waves. The target of a fully-developed WEC technology is not…
- Zanuttigh et al.
Aim of this paper is to analyse the power and hydraulic performance of a floating Wave Energy Converter with the purpose at optimising its design for installation in arrays. The paper presents new experiments carried out in 1:30 scale on a single device of the Wave Activated Body type in the deep-water wave tank at Aalborg University. Power production and wave transmission were examined by…
- Zhang et al.
Ocean waves are one of the most power dense energy sources in the environment. Triboelectric nanogenerators (TENGs) have been demonstrated to effectively harvest mechanical energy carried by low frequency, random/irregular actuation, such as from ocean waves. In this work, a novel design of triboelectric nanogenerator based on the Pelamis snake energy harvester is presented. The sea snake…
- Nørgaard and Andersen
This paper focuses on the calibration of the MIKE21BW model against the measured wave height reduction behind a 24 kW/m Wave Dragon (WD) wave energy converter. A numerical model is used to determine the wave transmission through the floating WD in varying wave conditions. The transmission obtained from the MIKE21BW model is compared to results from a simpler model, based on the integration of…
- Reabroy et al.
The hydrodynamic and power capture performance of an asymmetric floating device called “Dolphin” wave energy converter (WEC) integrated with a fixed breakwater has been proposed. The operation of the floating WEC device is restricted to the vertical direction called heaving motion. In this research, the theories of heaving motion, wave energy conversion, and computational fluid dynamics (CFD)…
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