Preliminary Testing of a New Vibration Energy Harvester (original) (raw)
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Article history: Received 14 April 2018 Received in revised form 14 May 2018 Accepted 20 May 2018 Available online 23 July 2018 The green technology approaches by harvesting energy from aerodynamic flowinduced vibrations using a flexible square cylinder is experimentally investigated. The practicability of flow-induced vibration system to supply a sufficient base excitation vibration in microwatt scale is evaluated through a series of wind tunnel tests with different velocities. Test are performed for high Reynolds number 3.9 x 10 ≤ Re 1.4 x 10 and damping ratio ζ = 0.0052. The experiment setup is able to replicate the pattern of vibration amplitude for isolated square cylinder with previous available study. Then, the experimental setup is used to study the effect of vibration cylinder in harvesting the fluid energy. A prototype of electromagnetic energy harvesting is invented and fabricated to test its performance in the wind tunnel test. Test results reveal that the harnessed powe...
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Since the energy demand increases, the sources of fluid energy such as wind energy and marine energy have attracted widespread attention, especially vortex-induced vibrations (VIV) excited by wind energy. This paper proposes a wind energy harvesting device-based VIV concept. The proposed device converts the mechanical energy of the oscillator into electrical energy. Different design shapes, that motivates disturbance in airflow, were proposed and tested. The proposed designs were numerically and experimentally tested to gauge their performance and efficiency in generating power. The detailed design and analysis for VIV including computational fluid dynamics (CFD) simulation were carried out. The CFD simulations were concentrated on the elastic rod (mast), which represents the critical component of the proposed model. Wind tunnel was used to conduct the experimental work. Piezoelectric sensors were utilized to measure and monitor extracted power. The best location of the piezoelectric sensors on the mast was investigated and located. The results of the simulations are reported in this paper. For each simulated case, lift coefficient, velocity, pressure, and vorticity contours are presented. It was also concluded that adding complexity to the geometry of the cylindrical proposed design would increase the lift force, and therefore, increasing the power. Promising numerical and experimental results were obtained, and power generation was maximized.
World Academy of Science, Engineering and Technology, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, 2018
This paper presents an experimental investigation for the characteristics of an energy harvesting device exploiting flowinduced vibration in a wind tunnel. A stationary bluff body is connected with a downstream tip body via an aluminium cantilever beam. Various lengths of aluminium cantilever beam and different shapes of downstream tip body are considered. The results show that the characteristics of the energy harvester's vibration depend on both the length of the aluminium cantilever beam and the shape of the downstream tip body. The highest ratio between vibration amplitude and bluff body diameter was found to be 1.39 for an energy harvester with a symmetrical triangular tip body and L/D 1 = 5 at 9.8 m/s of flow speed (Re = 20077). Using this configuration, the electrical energy was extracted with a polyvinylidene fluoride (PVDF) piezoelectric beam with different load resistances, of which the optimal value could be found on each Reynolds number. The highest power output was found to be 3.19 µW, at 9.8 m/s of flow speed (Re = 20077) and 27 MΩ of load resistance.
Performance Analysis of Vortex Induced Vibration Based Wind Energy Harvesting System
SSRN Electronic Journal, 2019
The growth of energy harvesting devices based on fluid interactions is part of the global research for new tools to generate renewable energy. In this treatise, the possibility to harvest energy from a wind flow using vortex-induced vibrations (VIV) of cylinder is analyzed. This work aims to develop a compact device that is able to harvest wind energy and transform it into electrical energy using the concept of vortex shedding. The VIV wind harvesting device features a hollow PVC cylinder of 50 cm length and 12 cm diameter of mass 0.681 kg as the airfoil. A cylinder was chosen as the airfoil because of its ability to harness an equal amount of lift force in both the positive and negative directions along the vertical axis. There are two piezoelectric crystal attached at each end of the spring so that the vibration made by the cylinder stresses the piezoelectric ceramic plate. The output electrical power is then obtained from the piezoelectric plate.