Tunable Wave Energy Converter Using Variable Inertia Flywheel

Li, Qiaofeng; Li, Xiaofan; Mi, Jia; Jiang, Boxi; Chen, Shuo; Zuo, Lei

doi:10.1109/tste.2020.3041664

Cited by 24 publications

(6 citation statements)

References 26 publications

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“…The generator system from the energy source drives/feeds the flywheel system electrically with absorbed energy. The flywheel system is then used mainly to phase out/smooth the absorbed energy, so the power is filtered to an acceptable output power [13] [14] [15].…”

Section: B Different Types Of Flywheel Usementioning

confidence: 99%

Low-RPM torque converter (LRTC) with Integrated direct shaft flywheel

2023

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The low-RPM Torque Converter (LRTC) is a rotating generator concept for use on the seabed with the driving force from sea waves motion on the sea surface. This concept is built up of two identical generators connected opposite each other via a spring drum with a built-in ball bearing clutch. The drum is connected to a buoy on the sea surface via a wire, the wire is rolled around the spring drum. With sea waves, the buoy moves either upwards or downwards and pulls the wire upwards or downwards. This movement causes the generators to spin. This article presents an upgrade of the LRTC generator concept and upgraded measurement system, both hardware and software. A flywheel system of the thin-disc type has been designed for direct connection to the generator's rotor shaft and an electronic measuring system has also been developed for more accurate measurements and minor disturbances. More detailed tests have been performed both for the purpose of comparing the systems and to explore the performance of the generator concept in more detail. Three different experiments have been done in this article. The first two experiments were performed to investigate the performance of the flywheel and to see the performance of the LRTC system with and without flywheel. The third experiment investigated the optimization of the flywheel mass by increasing the mass of the flywheel with the addition of more thin discs. All movements are simulated with a six-joint industrial robot. Several sinusoidal types of wave motions have been simulated with different time periods and also several real wave climate motions (data taken from fields) have been simulated with the robot. The experiments show that the addition of the flywheel in the LRTC system provides advantages in increasing both peak power, average output power and also softens the output power oscillation.

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Section: B Different Types Of Flywheel Usementioning

confidence: 99%

Low-RPM torque converter (LRTC) with Integrated direct shaft flywheel

2023

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“…8 show that the nominal design can be significantly improved by simply increasing the drive-train inertia. Going in the other direction, tuneable rather than fixed inertia [35] and stiffness [33], [34] might provide sufficient improvement in power performance to be worth the additional components and complexity. 1) Time Series Results: In this section we present time domain results for Sea State A to illustrate the optimal state trajectories for electrical power for both the nominal and optimal designs.…”

Section: B Optimal Pto For Annual Powermentioning

confidence: 99%

Control Co-Design of Power Take-Off Systems for Wave Energy Converters Using WecOptTool

Ströfer

Gaebele

Coe

et al. 2023

IEEE Trans. Sustain. Energy

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Improved power take-off (PTO) controller design for wave energy converters is considered a critical component for reducing the cost of energy production. However, the device and control design process often remains sequential, with the space of possible final designs largely reduced before the controller has been considered. Control co-design, whereby the device and control design are considered concurrently, has resulted in improved designs in many industries, but remains rare in the wave energy community. In this paper we demonstrate the use of a new opensource code, WecOptTool, for control co-design of wave energy converters, with the aim to make the co-design approach more accessible and accelerate its adoption. Additionally, we highlight the importance of designing a wave energy converter to maximize electrical power, rather than mechanical power, and demonstrate the co-design process while modeling the PTO's components (i.e., drive-train and generator, and their dynamics). We also consider the design and optimization of causal fixed-structure controllers. The demonstration presented here considers the PTO design problem and finds the optimal PTO drive-train that maximizes annual electrical power production. The results show a 22.0% improvement in the optimal controller and drive-train co-design over the optimal controller for the nominal, as built, device design.

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“…Recently, a vibration energy harvester for bicycles based on a directional variable inertia flywheel and coaxial mechanical motion rectifier was proposed by Chen et al [18]. A flywheel with symmetrically placed mass spring dampers in a ballscrewbased power take-off system was presented by Li [19]. With its variable inertia and mass amplification effect, the system equivalent mass and corresponding parameters can be adapted using small mass spring dampers.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Moment of Inertia Adjustment Device

Zeng,

Wan,

2024

Machines

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The vibration frequency characteristics of a rotor system are directly related to its moment of inertia. In this paper, a moment of inertia adjustment device is proposed to adjust the frequency characteristics of a rotor system and better reduce vibration by changing the moment of inertia. First, a mathematical model of the moment of inertia and the temperature field are established. A finite element simulation model of the electromagnetic field of the electromagnetic control unit in the device is established. The influence of current and air gap on the electromagnetic forces is discussed. Then, the validity of the finite element simulation for the electromagnetic control unit is verified using experimental results. In addition, the variations in the displacement and force of the moving mass and the moment of inertia of the device with speed are analyzed. The results show that the proposed moment of inertia adjustment device can be used to significantly adjust the moment of inertia, which provides a reference for better controlling vibrations in rotor systems. Finally, a finite element simulation model for an electromagnetic field analysis of the electromagnetic control unit in the device is established. The results show that the maximum temperature of the electromagnetic control device is 332 K in 60 min, which is in accordance with the requirements.

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Tunable Wave Energy Converter Using Variable Inertia Flywheel

Cited by 24 publications

References 26 publications

Low-RPM torque converter (LRTC) with Integrated direct shaft flywheel

Low-RPM torque converter (LRTC) with Integrated direct shaft flywheel

Control Co-Design of Power Take-Off Systems for Wave Energy Converters Using WecOptTool

Design and Analysis of a Moment of Inertia Adjustment Device

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