On the Importance of High–Fidelity Numerical Modelling of Ocean Wave Energy Converters under Controlled Conditions

2022 ◽  
Author(s):  
C. Windt
Keyword(s):  
Numerical Modelling ◽  
Wave Energy ◽  
Numerical Models ◽  
Ocean Wave ◽  
High Fidelity ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Controlled Conditions ◽  
Hydrodynamic Wave ◽  
Energy Converters

Abstract. Numerical modelling tools are commonly applied during the development and optimisation of ocean wave energy converters (WECs). Models are available for the hydrodynamic wave structure interaction, as well as the WEC sub–systems, such as the power take–off (PTO) model. Based on the implemented equations, different levels of fidelity are available for the numerical models. Specifically under controlled conditions, with enhance WEC motion, it is assumed that non-linearities are more prominent, re- quiring the use of high–fidelity modelling tools. Based on two different test cases for two different WECs, this paper highlights the importance of high–fidelity numerical modelling of WECs under controlled conditions.

Ocean Wave Energy Converters - A Perspective

2012 ◽  
Vol 36 (5) ◽  
pp. 707-715 ◽  
Author(s):  
Nanjundan Parthasarathy ◽  
Kui Ming Li ◽  
Yoon-Hwan Choi ◽  
Yeon-Won Lee
Keyword(s):  
Wave Energy ◽  
Ocean Wave ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Energy Converters

A review on front end conversion in ocean wave energy converters

2015 ◽  
Vol 9 (3) ◽  
pp. 297-310 ◽  
Author(s):  
Nagulan Santhosh ◽  
Venkatesan Baskaran ◽  
Arunachalam Amarkarthik
Keyword(s):  
Wave Energy ◽  
Ocean Wave ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Front End ◽  
Energy Converters

scholarly journals A Survey of Power Take-off Systems of Ocean Wave Energy Converters

2019 ◽  
Author(s):  
Zhenwei Liu ◽  
Ran Zhang ◽  
Han Xiao ◽  
Xu Wang
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Clean Energy ◽  
Ocean Wave ◽  
Direct Drive ◽  
Wave Energy Conversion ◽  
Drive Power ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Energy Converters

Ocean wave energy conversion as one of the renewable clean energy sources is attracting the research interests of many people. This review introduces different types of power take-off technology of wave energy converters. The main focus is the linear direct drive power take-off devices as they have the advantages for ocean wave energy conversion. The designs and optimizations of power take-off systems of ocean wave energy converters have been studied from reviewing the recently published literature. Also, the simple hydrodynamics of wave energy converters have been reviewed for design optimization of the wave energy converters at specific wave sites. The novel mechanical designs of the power take-off systems have been compared and investigated in order to increase the energy harvesting efficiency.

Analysis and Design of Twin Gyroscopes for Ocean-Wave Energy Converters and Ship Roll-Stabilizers

2019 ◽  
Author(s):  
Hidenori Murakami ◽  
Takeyuki Ono
Keyword(s):  
Wave Energy ◽  
Equations Of Motion ◽  
Ocean Wave ◽  
Configuration Spaces ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Ship Roll ◽  
Gyroscopic Systems ◽  
Lagrange’S Method ◽  
Energy Converters

Abstract Twin-gyroscopic systems are designed for ocean-wave energy converters and ship roll-stabilizers to double desirable gyroscopic effects and eliminate undesirable reaction torques. In deriving analytical equations of motion, the configuration spaces of gyroscopic systems are defined by using body-attached moving frames. The moving frame of each constituent body is defined by its inertial coordinates of the center of mass and a rotation matrix which expresses the attitude of its coordinate axes from the inertial coordinate axes. Therefore, to utilize powerful Lagrange’s method, it is extended to accommodate rotation matrices in configuration spaces and allow angular velocities as generalized velocities. First, in the paper, to identify undesirable reaction torques of gyroscopic systems and find a scheme to eliminate them, we present the basics of a reaction wheel. Second, to identify the desirable gyroscopic effect, we consider a control moment gyroscope and derive the equations of motion using the extended Lagrange’s method. In addition, the equations of motion are also derived by using the Newton-Euler method, where action and reaction torques are explicitly expressed. The comparison of the resulting equations derived by the two methods reveals the simplicity of Lagrange’s method in treating actuating motor torques and how the effects of reaction torques are implicitly included in the variationally derived equations. Finally, the equations of motion for a twin-gyroscopic system are obtained by incorporating the scheme to eliminate the undesirable reaction torques.

Analysis of rotating ocean wave energy converters.

2010 ◽  
Vol 128 (4) ◽  
pp. 2347-2347
Author(s):  
J. Gregory McDaniel ◽  
Alexandra M. Shivers
Keyword(s):  
Wave Energy ◽  
Ocean Wave ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Energy Converters

scholarly journals Ocean Wave Energy Converters: Status and Challenges

Energies ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 1250 ◽  
Author(s):  
Tunde Aderinto ◽  
Hua Li
Keyword(s):  
Wave Energy ◽  
Ocean Wave ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Energy Converters

Design of a Micro-grid Integration Circuit for Ocean Wave Energy Converters

2021 ◽  
Author(s):  
Mohammed Saeed Alyammahi ◽  
Saud Abdulla Alshehhi ◽  
Khalid Ali Abdelrab ◽  
Otbah Ibrahim Khamis ◽  
Ahmed Abdrabou ◽  
...  
Keyword(s):  
Wave Energy ◽  
Ocean Wave ◽  
Grid Integration ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Micro Grid ◽  
Energy Converters

Towards a Definition and Metric for the Survivability of Ocean Wave Energy Converters

2010 ◽  
Author(s):  
Adam Brown ◽  
Robert Paasch ◽  
Irem Y. Tumer ◽  
Pukha Lenee-Bluhm ◽  
Justin Hovland ◽  
...  
Keyword(s):  
Wave Energy ◽  
Energy Content ◽  
Ocean Waves ◽  
Wave Energy Converter ◽  
Ocean Wave ◽  
Energy Converter ◽  
Term Survival ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Energy Converters

Survivability is a term that is widely used in the ocean wave energy industry, but the term has never been defined in that context. The word itself seems to have an intrinsic meaning that people understand; this fact often leads to the term’s misuse and its confusion with “reliability”. In order to design systems that are capable of long term survival in the ocean environment, it must be clear what “survivability” means and how it affects the design process and ultimately the device being deployed. Ocean energy is relatively predictable over the span of months, days, and even hours, which makes it very promising as a form of renewable energy. However, the variation of the energy content of ocean waves in a given location is likely high due to the effect of storms and the seasons. Wave energy converters must be built to be reliable while operating and survivable during severe conditions. Therefore, probabilistic design practices must be used to insure reliability and survivability in conditions that are constantly changing. Reliability is used to numerically express the failures of a device that occur while the system is operational, and it is usually expressed in terms of the mean time between failure (MTBF). However, in the context of ocean wave energy converters, the devices are likely to be continuously deployed in conditions that push them beyond their operating limits. During these times it is likely that wave energy converters will be placed in some sort of “survival mode” where the device sheds excess power, reducing system loading. Survivability is focused specifically on failures that occur during these times, when the device is experiencing conditions that surpass its operational limits. Developing a highly survivable wave energy converter is an outstanding goal, but without a standard definition of the term survivability, progress towards that goal cannot be measured. The purpose of this paper is to provide an initial definition for survivability, and to introduce a simple metric that provides an objective comparison of the survivability of varying wave energy converter technologies.

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