Abstract
Buoys are one of the most widely used means for collecting environmental data from the seas and oceans and are located in different areas from the coasts. Various electrical equipment in buoys requires a suitable electrical source for performing their functions. A convenient and safe option for this purpose is the vibrational energy of sea waves that is available most of the time. But frequencies of ocean waves usually are low and have a wide range. For this reason, using the nonlinear elements in energy harvesting systems has become popular, improving harvesting efficiency on a broader frequency range and in lower excitation frequencies. This paper suggests a new design consisting of simultaneous horizontal and vertical piezoelectric energy harvesters inside a buoy. Each piezoelectric energy harvester is connected to a nonlinear energy sink, improving harvested energy on a broader frequency range. The Instantaneous extracted voltage and power in the horizontal direction can reach values of 100 V and 0.01 W and more, respectively. At first, the equations of the proposed system are described. Then the values of the system's parameters are introduced. By numerically solving the coupled equations, the device's performance in generating electrical voltage and power by piezoelectric elements is evaluated under the excitation of regular sea waves. The effect of system design parameters on the output electrical power is investigated. Accordingly, by using the proposed design, it is possible to supply the electrical energy required for the electronic equipment of the buoy.
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This research received no specific grant from the public, commercial, or not-for-profit funding agencies. The authors would like to thank Saeed Bab Shahmiri for his help and discussion in the lab.
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Heidari, M., Rahimi Sherbaf, G. Theoretical study of a new piezoelectric nonlinear energy harvester from ocean waves. J Braz. Soc. Mech. Sci. Eng. 44, 589 (2022). https://doi.org/10.1007/s40430-022-03882-4
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DOI: https://doi.org/10.1007/s40430-022-03882-4