scholarly journals Design and research of hydraulic conversion system of wave energy generating device

2021 ◽  
Vol 2125 (1) ◽  
pp. 012058
Author(s):  
Zifan Fang ◽  
Fei Xiong ◽  
Xueyuan Xie ◽  
Jiajia Wang
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
High Efficiency ◽  
Mechanical Energy ◽  
Hydraulic Motor ◽  
Object A ◽  
Output Stability ◽  
Conversion System ◽  
Charge Pressure ◽  
System Input

Abstract Taking the hydraulic conversion system of the oscillating flapping-wing wave energy power generation device as the research object, a hydraulic conversion system is designed to convert wave energy into usable mechanical energy. Based on the principle of high-efficiency collection of wave energy and stable output of the hydraulic conversion system, the composition of the hydraulic conversion system and the parameters of each component are determined. According to different sea conditions, the pre-charge pressure of the accumulator is adjusted to keep the pressure of the high and low pipelines of the hydraulic system stable, and the mechanical energy is stably output through the hydraulic motor. The AMESim simulation platform is used to build the model of acquisition mechanism and hydraulic conversion system, simulate the motion response of acquisition mechanism under actual sea conditions as the system input, and analyze the effectiveness and output stability of hydraulic conversion system. The results verify that the designed hydraulic conversion system can achieve efficient collection of wave energy. The research results have laid a theoretical foundation for the development and research of wave energy power generation devices.

Simulation Research on Test Platform of Wave Energy Hydraulic Conversion System in Laboratory Based on AMEsim

2012 ◽  
Vol 220-223 ◽  
pp. 1711-1714
Author(s):  
Shou Jun Wang ◽  
Qi Qiang Liu
Keyword(s):  
Power Generation ◽  
Energy Loss ◽  
Working Conditions ◽  
Dynamic Characteristics ◽  
Wave Energy ◽  
Wave Power ◽  
Simulation Research ◽  
Factors Affecting ◽  
Test Platform ◽  
Conversion System

The test platform of wave energy hydraulic conversion system is built up in the laboratory, which used to analyze the factors affecting the efficiency of wave power generation under the premise of simulating actual working conditions at sea with the maximum extent possible. This paper described the basic components and established the AMEsim model of the test platform, while we simulated the test platform based on AMEsim and researched the dynamic characteristics of the test platform and analyzed the energy loss of the system.

The Dimension Match and Parameters Setting of the Hydraulic Motor for the Hydraulic-Electromagnetic Energy-Regenerative Shock Absorber

2017 ◽  
Author(s):  
Jia Mi ◽  
Lin Xu ◽  
Sijing Guo ◽  
Mohamed A. A. Abdelkareem ◽  
Lingshuai Meng ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Shock Absorber ◽  
High Efficiency ◽  
Mechanical Energy ◽  
Hydraulic Cylinder ◽  
Electromagnetic Energy ◽  
Operating Conditions ◽  
Hydraulic Motor ◽  
Wide Range ◽  
Regenerative Shock Absorber

Hydraulic-electromagnetic Energy-regenerative Shock Absorber (HESA) has been proposed recently, with the purpose of mitigating vibration in vehicle suspensions and recovering vibration energy traditionally dissipated by oil dampers simultaneously. The HESA is composed of hydraulic cylinder, check valves, accumulators, hydraulic motor, generator, pipelines and so on. The energy conversion from hydraulic energy to mechanical energy mainly depends on the hydraulic motor between two accumulators. Hence, the dimension match and parameter settings of hydraulic motor for the HESA are extremely important for efficiency of the whole system. This paper studies the methods and steps for dimension matching and parameter settings of the hydraulic motor in a case of a typical commercial vehicle. To evaluate suspension’s vibration characteristics, experiments on the target tour bus have been done. Simulations are conducted to investigate the effects of the hydraulic motor in different working conditions. The simulation results verify that the methods and steps adopted are accurate over a wide range of operating conditions and also show that appropriate matching and parameter settings of the hydraulic motor attached in the HESA can work with high efficiency and then effectively improving energy conversion efficiency for the whole system. Therefore, the theory of the matching progress can guide the future design of an HESA.

scholarly journals Effective Mooring Rope Tension in Mechanical and Hydraulic Power Take-Off of Wave Energy Converter

2021 ◽  
Vol 13 (17) ◽  
pp. 9803
Author(s):  
Ji Woo Nam ◽  
Yong Jun Sung ◽  
Seong Wook Cho
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Energy Conversion Efficiency ◽  
Wave Energy Converter ◽  
Hydraulic Motor ◽  
Energy Converter ◽  
The Individual ◽  
Conversion Efficiencies

The InWave wave energy converter (WEC), which is three-tether WEC type, absorbs wave energy via moored cylindrical buoys with three ropes connected to a terrestrial power take-off (PTO) through a subsea pulley. In this study, a simulation study was conducted to select a suitable PTO when designing a three-tether WEC. The mechanical PTO transfers energy from the buoy to the generator using a gearbox, whereas the hydraulic PTO uses a hydraulic pump, an accumulator, and a hydraulic motor to convert mechanical energy into electrical energy. The hydraulic PTO has a lower energy conversion efficiency than that of the mechanical PTO owing to losses resulting from pipe friction and the individual efficiencies of the hydraulic pumps and motors. However, the efficiencies mentioned above are not the efficiency of the whole system. The efficiency of the whole system should be analyzed considering the tension of the rope and the efficiency of the generator. In this study, the energy conversion efficiencies of the InWave WEC installed the mechanical and hydraulic PTO devices are compared, and their behaviors are analyzed through numerical simulations. The mechanics of mechanical and hydraulic PTO applied to InWave are mathematically expressed, and the issues of the elements constituting the PTO are explained. Finally, factors to consider for PTO selection are presented.

Design of 3D Modeling for the Floating Wave Power Generation Device and Test

2013 ◽  
Vol 718-720 ◽  
pp. 1603-1608
Author(s):  
Shi Ming Wang ◽  
Ya Nan Wang ◽  
Li Na Ma
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
3D Modeling ◽  
Mechanical Energy ◽  
Electric Energy ◽  
Structure Design ◽  
Power Device ◽  
Wave Power ◽  
Ocean Wave Energy ◽  
Power Generation Device

Ocean wave energy is one kind of potential renewable energy, and the devices of using wave energy generate power are varied. This paper put forward a new method of using wave turbine to absorb wave energy, then output mechanical energy through mechanical drivers to generator, finally convert to electric energy by generator directly. Generally, structure design of the wave-wing is very important to the device. It is the important component of the device for absorbing wave energy. For this study, we designed the 3D modeling of the floating wave power device through SolidWorks software, and produced the wave turbine on proportion of 1:1. We had tested the wave turbine in the pool of the laboratory and obtain the torque and power under certain conditions.

Research on New Type Magnetohydrodynamic Ocean Wave Energy Conversion System

2014 ◽  
Vol 556-562 ◽  
pp. 1856-1859
Author(s):  
Zhen Wang ◽  
Yong Guo Li ◽  
Shi Ming Wang ◽  
Qing Yi He ◽  
Jie Zhang
Keyword(s):  
Liquid Metal ◽  
Energy Conversion ◽  
Permanent Magnet ◽  
Wave Energy ◽  
High Efficiency ◽  
Electrical Energy ◽  
Energy Conversion Efficiency ◽  
Channel Structure ◽  
Ocean Wave Energy ◽  
Conversion System

Liquid Metal MHD generation system for wave energy takes the wave motion into reciprocating motion of the liquid metal by using the efficient liquid Metal MHD power generation technology, and then the wave energy directly changes into electrical energy through the power conversion system. According to this principle, a flexible and direct magnetic fluid generating structure for wave energy is proposed. It selects the appropriate permanent magnet material and the liquid fluid, also an articulated manner to the permanent magnet. An array mode of permanent magnet and the initial channel structure of generating is important. The device has an advantage of low pollution, high efficiency and technology, can reduce energy consumption, improve energy conversion efficiency.

scholarly journals A Theoretical and Experimental Study of Moderate Temperature Alfa Type Stirling Engines

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1622 ◽  
Author(s):  
Jacek Kropiwnicki ◽  
Mariusz Furmanek
Keyword(s):  
High Efficiency ◽  
Waste Heat ◽  
Heating Temperature ◽  
Mechanical Energy ◽  
Stirling Engine ◽  
Moderate Temperature ◽  
Heat Sources ◽  
Stirling Engines ◽  
Charge Pressure ◽  
Further Development

The Stirling engine is a device that allows conversion of thermal energy into mechanical energy with relatively high efficiency. Existing commercial designs are mainly based on the usage of high temperature heat sources, whose availability from renewable or waste heat sources is significantly lower than that of moderate temperature sources. The paper presents the results of experimental research on a prototype alpha type Stirling engine powered by a moderate temperature source of heat. Obtained results enabled calibration of the evaluated theoretical model of the Stirling engine. The model of the engine has been subsequently used for the analysis of regenerator effectiveness influenced by the charge pressure and the heating temperature. Performed study allowed to determine further development directions of the prototype engine to improve its power and efficiency. As a result of optimization, worked out design will potentially increase the indicated efficiency up to 19.5% (5.5% prototype) and the indicated power up to 369 W (114 W prototype).

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.

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