scholarly journals Design and performance analysis of wave linear generator with parallel mechanism

2021 ◽  
Vol 12 (1) ◽  
pp. 405-417
Author(s):  
Tao Yao ◽  
Yulong Wang ◽  
Zhihua Wang ◽  
Can Qin
Keyword(s):  
Wave Energy ◽  
Inverse Kinematics ◽  
Parallel Mechanism ◽  
Wave Motion ◽  
Electrical Energy ◽  
Vector Method ◽  
Linear Generator ◽  
Flux Intensity ◽  
And Performance ◽  
Electromagnetic Performance

Abstract. Considering the irregularity of wave motion, a wave energy converter (WEC) based on 6-UCU parallel mechanism has been investigated. A buoy connected to moving platform is used to harvest wave energy. Each chain is equipped with the linear generator of the same structure, which can convert the absorbed wave energy into electrical energy. Based on the inverse kinematics analysis of parallel mechanism, the position of the parallel mechanism is solved by using the space closed-loop vector method; the relative motion of stator and translator is obtained. Through electromagnetic numerical simulations, the influences of linear generator parameters such as magnetization mode, air gap, and yoke shape on electromagnetic performance were evaluated. Numerical results show axial magnetization and Halbach magnet array can increase magnetic flux intensity more than radial mode. Furthermore, the rule of electromagnetic resistance is discussed with the change of the speed amplitude and the angle frequency. For a case, dynamic differential equation of the whole system is established. The conversion rate of wave energy is derived.

Analysis, Design, and Evaluation of the UC-Berkeley Wave-Energy Extractor

2010 ◽  
Author(s):  
Ronald W. Yeung ◽  
Antoine Peiffer ◽  
Nathan Tom ◽  
Tomasz Matlak
Keyword(s):  
Wave Energy ◽  
Electrical Energy ◽  
Electromagnetic Properties ◽  
Generator System ◽  
Future Directions ◽  
Strongly Coupled ◽  
Linear Generator ◽  
Ocean Wave Energy ◽  
Theoretical Predictions ◽  
And Performance

This paper evaluates the technical feasibility and performance characteristics of an ocean-wave energy to electrical energy conversion device that is based on a moving linear generator. The UC-Berkeley design consists of a cylindrical floater, acting as a rotor, which drives a stator consisting of two banks of wound coils. The performance of such a device in waves depends on the hydrodynamics of the floater, the motion of which is strongly coupled to the electromagnetic properties of the generator. Mathematical models are developed to reveal the critical hurdles that can affect the efficiency of the design. A working physical unit is also constructed. The linear generator is first tested in a dry environment to quantify its performance. The complete physical floater and generator system is then tested in a wave tank with a computer-controlled wavemaker. Measurements are compared with theoretical predictions to allow an assessment of the viability of the design and future directions for improvements.

Design, Analysis, and Evaluation of the UC-Berkeley Wave-Energy Extractor

2011 ◽  
Vol 134 (2) ◽  
Author(s):  
Ronald W. Yeung ◽  
Antoine Peiffer ◽  
Nathan Tom ◽  
Tomasz Matlak
Keyword(s):  
Wave Energy ◽  
Electrical Energy ◽  
Electromagnetic Properties ◽  
Generator System ◽  
Strongly Coupled ◽  
Analysis And Evaluation ◽  
Linear Generator ◽  
Ocean Wave Energy ◽  
Theoretical Predictions ◽  
And Performance

This paper evaluates the technical feasibility and performance characteristics of an ocean-wave energy to electrical energy conversion device that is based on a moving linear generator. The UC-Berkeley design consists of a cylindrical floater, acting as a rotor, which drives a stator consisting of two banks of wound coils. The performance of such a device in waves depends on the hydrodynamics of the floater, the motion of which is strongly coupled to the electromagnetic properties of the generator. Mathematical models are developed to reveal the critical hurdles that can affect the efficiency of the design. A working physical unit is also constructed. The linear generator is first tested in a dry environment to quantify its performance. The complete physical floater and generator system is then tested in a wave tank with a computer-controlled wavemaker. Measurements are compared with theoretical predictions to allow an assessment of the viability of the design and the future directions for improvements.

Analysis of Electromagnetic Force for the Linear Generator Wave Energy Converters

2015 ◽  
Vol 764-765 ◽  
pp. 418-422
Author(s):  
Peng Huang ◽  
Da Xiao Gao ◽  
Zhong Qiang Zheng ◽  
Xiang Biao Kong ◽  
Zong Yu Chang
Keyword(s):  
Environmental Pollution ◽  
Wave Energy ◽  
Electromagnetic Force ◽  
New Technology ◽  
Electrical Energy ◽  
Small Probability ◽  
Linear Generator ◽  
Wave Energy Converters ◽  
Scientists And Engineers ◽  
First Time

In recent decades environmental pollution and energy crisis have become a challenging task for the scientists and engineers who lead them to innovate new technology and solve this problem by reducing environmental pollution and by exploiting the new source of energy. In this regard wave energy is appeared to be a suitable outcome in order to resolve the current issues. This paper studies and summarizes that the linear generators are considered a device which is used to convert wave energy into electrical energy efficiently. It is the first time to calculate the electromagnetic force by considering the linear generator and at the same time simulated by Ansoft Maxwell software; by providing calculated value and simulated value, it is also verified that the calculated result is accurate with a small probability error as compared to software calculated value.

scholarly journals Design of Bilateral Switched Reluctance Linear Generator to Convert Wave Energy: Case Study in Sicily

2013 ◽  
Vol 860-863 ◽  
pp. 1694-1698 ◽  
Author(s):  
Vincenzo Di Dio ◽  
Vincenzo Franzitta ◽  
Daniele Milone ◽  
Salvatore Pitruzzella ◽  
Marco Trapanese ◽  
...  
Keyword(s):  
Wave Energy ◽  
Fem Simulation ◽  
Electrical Energy ◽  
Oscillatory Motion ◽  
Constant Speed ◽  
Variable Speed ◽  
Switched Reluctance ◽  
Linear Generator ◽  
The Law

The aim of this work is a case study of the adaptation bilateral switched reluctance linear generator to the exploitation of energy of the sea. This type of generator can be used to convert wave energy in electrical energy. In this paper we present an analytical sizing and FEM simulation. As for the results, analysis of the data extracted through the simulations it was possible to calculate the emf. The emf was calculated in two cases of motion of the slider: first hypothesis has set the constant speed while the second is a variable speed according to the law of an oscillatory motion of the sea.

scholarly journals Recent advances in ocean wave energy harvesting by triboelectric nanogenerator: An overview

2020 ◽  
Vol 9 (1) ◽  
pp. 716-735
Author(s):  
Bin Huang ◽  
Pengzhong Wang ◽  
Lu Wang ◽  
Shuai Yang ◽  
Dazhuan Wu
Keyword(s):  
Energy Harvesting ◽  
Wave Energy ◽  
Water Wave ◽  
Modern Society ◽  
Electrical Energy ◽  
Ocean Wave ◽  
Triboelectric Nanogenerator ◽  
Ocean Wave Energy ◽  
Recent Advances ◽  
And Performance

AbstractA sustainable power source is more and more important in modern society. Ocean wave energy is a very promising renewable energy source, and it is widely distributed worldwide. But, it is difficult to develop efficiently due to various limitations of the traditional electromagnetic generator. In recent years, the newly developed triboelectric nanogenerator (TENG) provides an excellent way to convert water wave energy into electrical energy, which is mainly based on the coupling between triboelectrification and electrostatic induction. In this paper, a review is given for recent advances in using the TENG technology harvesting water wave energy. We first introduce the four most fundamental modes of TENG, based on which a range of wave energy harvesting devices have been demonstrated. Then, these applications’ structure and performance optimizations are discussed. Besides, the connection methods between TENG units are also summarized. Finally, it also outlines the development prospects and challenges of technology.

scholarly journals Analysis of the Oceanic Wave Dynamics for Generation of Electrical Energy Using a Linear Generator

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Omar Farrok ◽  
Md. Rabiul Islam ◽  
Md. Rafiqul Islam Sheikh
Keyword(s):  
Magnetic Flux ◽  
Wave Energy ◽  
Electrical Energy ◽  
Ocean Waves ◽  
Wave Dynamics ◽  
Linear Generator ◽  
Oceanic Wave ◽  
Wave Conditions ◽  
Force Components ◽  
Sea Wave

Electricity generation from oceanic wave depends on the wave dynamics and the behavior of the ocean. In this paper, a permanent magnet linear generator (PMLG) has been designed and analyzed for oceanic wave energy conversion. The proposed PMLG design is suitable for the point absorber type wave energy device. A mathematical model of ocean wave is presented to observe the output characteristics and performance of the PMLG with the variation of ocean waves. The generated voltage, current, power, applied force, magnetic flux linkage, and force components of the proposed PMLG have been presented for different sea wave conditions. The commercially available software package ANSYS/ANSOFT has been used to simulate the proposed PMLG by the finite element method. The magnetic flux lines, flux density, and field intensity of the proposed PMLG that greatly varies with time are presented for transient analysis. The simulation result shows the excellent features of the PMLG for constant and variable speeds related to wave conditions. These analyses help to select proper PMLG parameters for better utilization of sea wave to maximize output power.

scholarly journals A Piezoelectric Wave-Energy Converter Equipped with a Geared-Linkage-Based Frequency Up-Conversion Mechanism

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 204
Author(s):  
Shao-En Chen ◽  
Ray-Yeng Yang ◽  
Guang-Kai Wu ◽  
Chia-Che Wu
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
Wave Motion ◽  
Wave Energy Converter ◽  
Gear Train ◽  
Piezoelectric Composite ◽  
Maximum Height ◽  
Resistive Load ◽  
Linkage Mechanism ◽  
Energy Converter

In this paper, a piezoelectric wave-energy converter (PWEC), consisting of a buoy, a frequency up-conversion mechanism, and a piezoelectric power-generator component, is developed. The frequency up-conversion mechanism consists of a gear train and geared-linkage mechanism, which converted lower frequencies of wave motion into higher frequencies of mechanical motion. The slider had a six-period displacement compared to the wave motion and was used to excite the piezoelectric power-generation component. Therefore, the operating frequency of the piezoelectric power-generation component was six times the frequency of the wave motion. The developed, flexible piezoelectric composite films of the generator component were used to generate electrical voltage. The piezoelectric film was composed of a copper/nickel foil as the substrate, lead–zirconium–titanium (PZT) material as the piezoelectric layer, and silver material as an upper-electrode layer. The sol-gel process was used to fabricate the PZT layer. The developed PWEC was tested in the wave flume at the Tainan Hydraulics Laboratory, Taiwan (THL). The maximum height and the minimum period were set to 100 mm and 1 s, respectively. The maximum voltage of the measured value was 2.8 V. The root-mean-square (RMS) voltage was 824 mV, which was measured through connection to an external 495 kΩ resistive load. The average electric power was 1.37 μW.

scholarly journals HF Radars for Wave Energy Resource Assessment Offshore NW Spain

2021 ◽  
Vol 13 (11) ◽  
pp. 2070
Author(s):  
Ana Basañez ◽  
Vicente Pérez-Muñuzuri
Keyword(s):  
Wave Energy ◽  
Numerical Models ◽  
Wave Spectrum ◽  
Energy Resource ◽  
Electrical Energy ◽  
Resource Assessment ◽  
Electricity Production ◽  
Statistical Validation ◽  
Wave Energy Converters ◽  
Energy Converters

Wave energy resource assessment is crucial for the development of the marine renewable industry. High-frequency radars (HF radars) have been demonstrated to be a useful wave measuring tool. Therefore, in this work, we evaluated the accuracy of two CODAR Seasonde HF radars for describing the wave energy resource of two offshore areas in the west Galician coast, Spain (Vilán and Silleiro capes). The resulting wave characterization was used to estimate the electricity production of two wave energy converters. Results were validated against wave data from two buoys and two numerical models (SIMAR, (Marine Simulation) and WaveWatch III). The statistical validation revealed that the radar of Silleiro cape significantly overestimates the wave power, mainly due to a large overestimation of the wave energy period. The effect of the radars’ data loss during low wave energy periods on the mean wave energy is partially compensated with the overestimation of wave height and energy period. The theoretical electrical energy production of the wave energy converters was also affected by these differences. Energy period estimation was found to be highly conditioned to the unimodal interpretation of the wave spectrum, and it is expected that new releases of the radar software will be able to characterize different sea states independently.

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