Design and Analysis of a Two-Body Wave Energy Converter With Mechanical Motion Rectifier

2016 ◽  
Author(s):  
Xiaofan Li ◽  
Changwei Liang ◽  
Lei Zuo
Keyword(s):  
Output Power ◽  
Relative Motion ◽  
Wave Energy ◽  
Average Output Power ◽  
Body Wave ◽  
Wave Energy Converter ◽  
Mechanical Motion ◽  
Energy Converter ◽  
Average Output ◽  
Wave Condition

The design and dynamic analysis of a two-body wave energy converter with 50W average output power is presented in this paper. The wave energy is extracted through the relative motion between a floating buoy and a submerged body, both oscillating in the heave direction. A ball screw system is used to convert the linear relative motion into bidirectional rotation of the screw. Moreover, a mechanical motion rectifier (MMR) is used in the power take-off (PTO) design and convert the bidirectional rotation into unidirectional rotation of generator by using two one-way bearings in the gear system. The dynamic equation of this two-body wave energy converter is established by considering the engagement and disengagement of the one-way bearings in the PTO system. The simulation results in the regular and irregular waves are presented and the average output power of the proposed wave energy converter under different wave condition are estimated.

MODELLING OF ONE WAY GEARS WAVE ENERGY CONVERTER FOR IRREGULAR OCEAN WAVES TO GENERATE ELECTRICITY

2016 ◽  
Vol 78 (5-7) ◽  
Author(s):  
Masjono Masjono ◽  
Salama Manjang ◽  
Dadang A. Suriamiharja ◽  
M. Arsyad Thaha
Keyword(s):  
Output Power ◽  
Analytical Model ◽  
Wave Energy ◽  
Ocean Waves ◽  
Wave Energy Converter ◽  
Gravity Force ◽  
Energy Converter ◽  
Wave Condition ◽  
Proposed Model ◽  
Project Model

The prediction of converted energy by one way gears wave energy converter may be influenced by non-linearity properties of the ocean waves. To date there has not been an adequate analytical model to predict the power production of one way gear wave energy converter under irregular wave condition. In this work, analytical model is developed to describe the interaction of one way gear wave energy converter that utilized gravity force of the gravityweight (M) with irregular ocean waves using JONSWAP (Joint North Sea Wave Project) model. This interaction model has been simulated numerically by means of computer software. The simulation result showed that wave height is strongly determining the converted output power. The outcome of harnessing the gravity force instead of buoyant force of this proposed model that commonly used by the previous wave energy converter demonstrate significant potential output power. The proposed model can be used to design feasible and efficient wave energy converter.

scholarly journals Design and Simulation of a Novel Mechanical Power Take-Off for a Two-Body Wave Energy Point Absorber

2018 ◽  
Author(s):  
Xiaofan Li ◽  
Chien-An Chen ◽  
Qiuchi Xiong ◽  
Robert Parker ◽  
Lei Zuo
Keyword(s):  
Frequency Domain ◽  
Output Power ◽  
Wave Energy ◽  
Time Domain ◽  
Wave Energy Converter ◽  
Mechanical Power ◽  
Total Output ◽  
Test Machine ◽  
Mechanical Motion ◽  
Energy Converter

In this paper, a two-body self-react wave energy converter with a novel mechanical Power Take-off (PTO) is introduced. The PTO rectifies the mechanical motion and regulates the flow with a mechanism called Mechanical Motion Rectifier (MMR), which converts the reciprocating motion of the ocean wave into unidirectional rotation of the generator. The overall system is analyzed in both time and frequency domain. In time domain, the piecewise non-linear dynamic model of the MMR PTO is derived, and parameters that could significantly influence the MMR property is extracted. By building the model into WEC-Sim, a time domain wave energy converter (WEC) simulation tool, to simulate and evaluate the performance of the PTO. In addition, the system is modelled as a two-body vibration system for frequency domain analysis in order to further investigate and optimize the proposed wave energy converter. The tunable parameters within the system, including the equivalent mass, the equivalent damping coefficient, and the PTO stiffness, are discussed based on the criteria of maximization of the total output power. To verify the theoretical analysis, a bench test prototype is developed and tested on a hydraulic test machine. The experimental results in line with the derived model and can be used for reasonable estimation on the output power of the proposed system in real ocean conditions.

Structural Analysis of a Multi-Body Wave Energy Converter in the Frequency Domain by Interfacing WAMIT and ABAQUS

2008 ◽  
Author(s):  
Reza Taghipour ◽  
Arswendy Arswendy ◽  
Me`lanie Devergez ◽  
Torgeir Moan
Keyword(s):  
Frequency Domain ◽  
Wave Energy ◽  
Body Wave ◽  
Structural Response ◽  
Wave Energy Converter ◽  
Software Systems ◽  
Energy Converter ◽  
Wave Condition ◽  
Finite Element Software ◽  
Multi Body

In this paper the structural response of a multi-body wave energy converter with power take-off is analyzed in the frequency domain. The device consists of a semisubmersible platform and 21 buoys. The buoys can slide along guides that are attached to the platform. The hydrodynamic and structural problems are solved by using boundary element and finite element software systems WAMIT and ABAQUS. The hydrodynamic analysis is carried out by a linear perturbation approach. A mode expansion method, with total number of 27 modes, is used to describe the dynamic behavior. Moreover, an idealized form of power absorption mechanism is considered herein. A general procedure is established to interface the relevant information between the two software systems. Such information includes the radiation, diffraction and restoring force pressures and inertia loads, etc. In this way, the interaction between the floating bodies is included in the solution in which the dynamic reaction forces are carried as external forces. The structural response is obtained by a quasi-static approach. The objective is to investigate the still water and wave induced internal loads in the column-deck and guide-deck connections in the form of transfer functions. To demonstrate the approach, calculations are made for a following- and oblique-sea wave condition.

Novel hydraulic mechanism-based output power regulation for the wave energy converter

2021 ◽  
Vol 110 ◽  
pp. 102587
Author(s):  
Dazhou Geng ◽  
Yang Zheng ◽  
Qijuan Chen ◽  
Xuhui Yue ◽  
Donglin Yan
Keyword(s):  
Output Power ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Power Regulation ◽  
Hydraulic Mechanism

Adaptive damping power take-off control for a three-body wave energy converter

2013 ◽  
Author(s):  
Zhe Zhang ◽  
Ted Brekken ◽  
Ken Rhinefrank ◽  
Al Schacher ◽  
Joe Prudell ◽  
...  
Keyword(s):  
Wave Energy ◽  
Body Wave ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Three Body

scholarly journals Deep Learning for Wave Energy Converter Modeling Using Long Short Term Memory

2021 ◽  
Author(s):  
Seyed Milad Mousavi ◽  
Majid Ghasemi ◽  
Mahsa Dehghan Manshadi ◽  
Amir Mosavi
Keyword(s):  
Wind Speed ◽  
Output Power ◽  
Wave Energy ◽  
Short Term Memory ◽  
Ocean Waves ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Short Term ◽  
Term Memory ◽  
Long Short Term Memory

Accurate forecasts of ocean waves energy can not only reduce costs for investment but it is also essential for management and operation of electrical power. This paper presents an innovative approach based on the Long Short Term Memory (LSTM) to predict the power generation of an economical wave energy converter named “Searaser”. The data for analyzing is provided by collecting the experimental data from another study and the exerted data from numerical simulation of searaser. The simulation is done with Flow-3D software which has high capability in analyzing the fluid solid interactions. The lack of relation between wind speed and output power in previous studies needs to be investigated in this field. Therefore, in this study the wind speed and output power are related with a LSTM method. Moreover, it can be inferred that the LSTM Network is able to predict power in terms of height more accurately and faster than the numerical solution in a field of predicting. The network output figures show a great agreement and the root mean square is 0.49 in the mean value related to the accuracy of LSTM method. Furthermore, the mathematical relation between the generated power and wave height was introduced by curve fitting of the power function to the result of LSTM method.

Modeling and Experiment of a Novel Micro Wave Energy Converter

2017 ◽  
Vol 863 ◽  
pp. 175-182
Author(s):  
Yi Ming Zhu ◽  
Zi Rong Luo ◽  
Zhong Yue Lu ◽  
Jian Zhong Shang
Keyword(s):  
Output Power ◽  
Wave Energy ◽  
Mechanical Energy ◽  
Vertical Motion ◽  
Electrical Energy ◽  
Wave Energy Converter ◽  
Design Parameters ◽  
Energy Converter ◽  
Drive Power ◽  
Continuous Rotation

This paper proposed a novel micro wave energy converter which can convert irregular wave energy into rotating mechanical energy, then into electrical energy. The device consists of an energy absorption part and an energy conversion part. In details, the blades are installed on the absorber circumferentially and averagely, which are capable of converting the vertical motion of the surface body to continuous rotation of the absorber and leading to a great increase in efficiency. A physical prototype was built to test the performance of the novel generator and optimize the design parameters. In the experiment part, a linear motion electric cylinder was used as the drive power to provide the heaving motion for the device. And the experiment platform was built for modeling a marine environment. Also, a data acquisition program was edited in Labview. Thus, the experiment analyzed the influence of amplitude, frequency, blade angle and resistance value to the output power, and then obtained the optimum parameters combination which can maximize the value of the output power. The result will provide reference for the device’s further application.

A multi-point-absorber wave-energy converter for the stabilization of output power

2018 ◽  
Vol 161 ◽  
pp. 337-349 ◽  
Author(s):  
Hoang-Thinh Do ◽  
Tri-Dung Dang ◽  
Kyoung Kwan Ahn
Keyword(s):  
Output Power ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Point Absorber

scholarly journals Multi-Stable Mechanism of an Oscillating-Body Wave Energy Converter

2020 ◽  
Vol 11 (1) ◽  
pp. 500-508 ◽  
Author(s):  
Liang Li ◽  
Xiantao Zhang ◽  
Zhiming Yuan ◽  
Yan Gao
Keyword(s):  
Wave Energy ◽  
Body Wave ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Stable Mechanism
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