The Effects of Spring Stiffness on Vortex-Induced Vibration for Energy Generation

Zahari, Madiha; Chan, H. P.; Yong, Tshun Howe; Dol, Sharul Sham

doi:10.1088/1757-899x/78/1/012041

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…The longer the plate length, the lower the stiffness of the system, the larger the vibration, and hence, the higher the harvested energy. The outcome of the present study is consistent with Zahari et al [13], where a lower stiffness of the system provides greater effect on vortex-induced vibration. To perform the next experiment with the presence of magnets, 100 mm plate is chosen.…”

Section: Different Lengths Of Platesupporting

confidence: 93%

Preliminary investigation on the energy harvesting of vortex-induced vibration with the use of magnet

Adnan

Lee

Kang

et al. 2022

PROGEE

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The utilization of natural resources as renewable energy is thriving as its innovation brings clean energy, environmentally friendly and also cut down costs. Hence, the purpose of this study is to propose a technique to enhance the output voltage of piezoelectric as an energy harvesting device by applying nonlinear magnetic forces from a phenomenon called vortex induced vibration (VIV). This harvester device is designed with a presence of two magnets that placed at the bottom of a circular cylinder and on the lower base. The mechanical conversion energy that is studied is the vibration from circular cylinder’s oscillation through a phenomenon called Vortex Induced Vibration by using piezoelectric transducer. A VIV-based energy harvester has been fabricated and carried out in water flow to observe the optimum output voltage that can be generated. Three different lengths of piezoelectric cantilever plates and two magnet distances are tested to investigate the influence of system’s stiffness and the repulsive force to the harvested energy. From the experiment, it is observed that a lower stiffness of the system provides higher harvested voltage. In addition, the presence of magnets shows a greater output voltage due to the action of nonlinear magnetic forces where the position between two magnets able to shift the synchronization region thus, showing a greatly wider synchronization region and increasing the performance of VIV-based energy harvesting system.

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Section: Different Lengths Of Platesupporting

confidence: 93%

Preliminary investigation on the energy harvesting of vortex-induced vibration with the use of magnet

Adnan

Lee

Kang

et al. 2022

PROGEE

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“…conditions and an inlet velocity of 8.00 m/s (Re = 1095) [44][45][46]. This led to a calculated vortex shedding frequency of around 840 Hz, closely aligning with the FFT analysis outcomes and affirming the influence of the vortex behavior on the electrical output of the harvester.…”

Section: Harnessing Wind Energy: Correlating Vortex-induced Dynamics ...supporting

confidence: 72%

“…In this context, it is essential to clarify that the "vortex shedding frequency" pertains exclusively to the frequency at which vortices are shed by the fluid flow, distinctly separate from the oscillation frequency of the structural. Considering the Reynolds number variations, the Strouhal number was experimentally determined to be approximately 0.21, resonating with the fluidic conditions and an inlet velocity 8.00 m/s (Re = 1095) [44][45][46]. This led to a calculated vortex shedding frequency of around 840 Hz, closely aligning with the FFT analysis outcomes and affirming the influence of the vortex behavior on the electrical output of the harvester.…”

Section: Harnessing Wind Energy: Correlating Vortex-induced Dynamics ...supporting

confidence: 58%

Fluid Flow to Electricity: Capturing Flow-Induced Vibrations with Micro-Electromechanical-System-Based Piezoelectric Energy Harvester

Kang,

Kim,

Shin

et al. 2024

Micromachines

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We introduce a micro-electromechanical system (MEMS) energy harvester, designed for capturing flow energy. Moving beyond traditional vibration-based energy harvesting, our approach incorporates a cylindrical oscillator mounted on an MEMS chip, effectively harnessing wind energy through flow-induced vibration (FIV). A highlight of our research is the development of a comprehensive fabrication process, utilizing a 5.00 µm thick cantilever beam and piezoelectric film, optimized through advanced micromachining techniques. This process ensures the harvester’s alignment with theoretical predictions and enhances its operational efficiency. Our wind tunnel experiments confirmed the harvester’s capability to generate a notable electrical output, with a peak voltage of 2.56 mV at an 8.00 m/s wind speed. Furthermore, we observed a strong correlation between the experimentally measured voltage frequencies and the lift force frequency observed by CFD analysis, with dominant frequencies identified in the range of 830 Hz to 867 Hz, demonstrating the potential application in actual flow environments. By demonstrating the feasibility of efficient energy conversion from ambient wind, our research contributes to the development of sustainable energy solutions and low-power wireless electron devices.

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“…The ability of vortex-induced vibration (VIV) to increase the strength of vortices shed through the vibration (e.g., see [1][2][3]) could promote the turbulence generated by a flexible protruding surface. Vortex shedding (typically a Kármán vortex) happens when flowing past a bluff body.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Flexible Cylinder Structural Dynamics to the near Wake Turbulence

Dol,

Wee,

Yong

et al. 2023

Fluids

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The utilization of a rigid and projecting surface, coupled with an agitator and vortex generator, frequently results in the dissipation of more energy than the production of turbulence that meets the required criteria. By contrast, a passively oscillating flexible protruding surface can generate a greater turbulence level. In the current study, a circular finite cylinder (cantilever) was used as the geometry of the rigid and protruding surface. Both the material and the aspect ratio were varied. Also, a local Reynolds number within the subcritical flow range (102 < ReD < 105) was considered. The results from the rigid protruding surface (finite cylinder) serve as a validation of the published results and a benchmark for the improvement of the turbulence generated by the flexible protruding surface. The results obtained via an ultrasonic velocity profiler have further demonstrated that the flexible cylinder is capable of generating greater turbulence by examining the turbulence intensity, the turbulence production term and the Reynolds stress. All the flexible cylinders that oscillate show an increase in turbulence production but at different percentages. The cylinders studied in this work ranged from the least structural stiffness (EVA) to moderate (aluminum) and the highest structural stiffness (carbon steel). Through studying the normalized amplitude responses graph for the flexible cylinders, it is found that the oscillating motion does indeed contribute to the increment. A further examination of the results shows that the increase is due to the structural velocity instead of just the oscillating motion.

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The Effects of Spring Stiffness on Vortex-Induced Vibration for Energy Generation

Cited by 10 publications

References 2 publications

Preliminary investigation on the energy harvesting of vortex-induced vibration with the use of magnet

Preliminary investigation on the energy harvesting of vortex-induced vibration with the use of magnet

Fluid Flow to Electricity: Capturing Flow-Induced Vibrations with Micro-Electromechanical-System-Based Piezoelectric Energy Harvester

The Effects of Flexible Cylinder Structural Dynamics to the near Wake Turbulence

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