Volume 17, Issue 10 (1-2018)                   Modares Mechanical Engineering 2018, 17(10): 233-241 | Back to browse issues page

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Sobhanirad S, Afsharfard A. Experimental study of galloping-based energy harvesting system using piezoelectric materials. Modares Mechanical Engineering 2018; 17 (10) :233-241
URL: http://mme.modares.ac.ir/article-15-11203-en.html
1- Department of Mechanical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, ‎Mashhad, Iran
2- Mechanical Engineering Department / Ferdowsi University of Mashhad
Abstract:   (4679 Views)
In this study, a galloping-based energy harvesting system is designed using a nonlinear energy harvesting sink (NES). In doing so, electromechanical equations of motion for the energy harvesting system are derived and the theoretical results are validated with experimental results. Then, three steps are presented to make system work efficiently. In the first step, several cross-section geometries for the bluff body are investigated and the results are verified by the Harmonic Balance Method. These results indicate that isosceles triangular section can harvest more energy than the other ones. In the second step, effect of changing the electrical load resistance on electromechanical behavior of the system is investigated and it is demonstrated that the maximum energy is harvested for load resistance values of more than 1 MΩ. In the third step, influence of changing the tip mass on the system is studied and it is shown that increasing the tip mass leads to increase the output voltage while the bluff body amplitudes remain constant. Consequently, the system is designed to work with the maximum possible tip mass which is about 35.3 gr. Finally, this system with a bluff body of isosceles triangular section can generate 700 mV using the load resistance value of 10 MΩ in the wind speed of 2.5 m/s. This system with the total mass of less than 500 gr and low-amplitude oscillations is designed to work properly in low wind speeds and presents an efficient application for low-power energy harvesting systems.
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Article Type: Research Article | Subject: Vibration
Received: 2017/08/1 | Accepted: 2017/09/16 | Published: 2017/10/20

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