Abstract
The power generation capacity of piezoelectric cantilever energy harvester is limited by the narrow bandwidth of beam resonances. To overcome this problem, vibration modal analysis of piezoelectric cantilevers was carried out with different configurations that can be realized in a vertical system. Combining with the operating characteristics of the rotating machine, a scheme was proposed. In this scheme, the bending and torsional vibration modes were combined to constitute the piezoelectric cantilever energy harvester with wideband characteristics. The coupling of the bending mode and the twisting mode was implemented, by the segmented piezoelectric plate structure and the distributive mass arrangements. Finite element analysis was done for those configurations, and the simulation results show that the natural frequency of first bending mode is 11.26 Hz and the natural frequency of twisting mode can be reduced to 20.08 Hz. The amplitude of the output voltage from single piezoelectric plate, could be up to as high as 2.4 V. The optimized energy harvester has the broadband power generation capacity to be more suitable for a wide range of rotor speeds.
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The support for this research under the Open Fund Project of Key Laboratory of Modern Measurement and Control Technology, Ministry of Education (Grant No. KF20211123205) is gratefully acknowledged. Without their financial support, this work would not have been possible.
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Mo, W. et al. (2023). Simulation and Optimization of Piezoelectric Cantilever Configurations for Energy Harvesting with Multi-modal Vibrations. In: Zhang, H., Ji, Y., Liu, T., Sun, X., Ball, A.D. (eds) Proceedings of TEPEN 2022. TEPEN 2022. Mechanisms and Machine Science, vol 129. Springer, Cham. https://doi.org/10.1007/978-3-031-26193-0_67
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