Iranian Society of Acoustics and Vibration and Avecina Journal of Theoretical and Applied Vibration and Acoustics 2423-4761 6 2 2020 12 20 Vibrational energy harvesting from a monostable piezomagnetoelastic structure with multi-frequency excitation 337 347 251686 10.22064/tava.2021.533544.1188 EN Hadi Partovi Aria M.Sc. Student, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran Arash Bahrami Assistant Professor, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran 0000-0002-9222-8795 Ali Sadighi Assistant Professor, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran Journal Article 2020 03 20 The present article proposes the idea of multi-frequency excitation to harvest energy from low-frequency ambient vibrations. A nonlinear piezomagnetoelastic set-up, operating in the monostable mode, is considered. Due to nonlinearities being present in the system, a multi-frequency excitation gives rise to complicated phenomena such as combination and simultaneous resonances. We propose the idea of multi-frequency excitation and employing secondary resonances such as combination and simultaneous resonances occurring in nonlinear systems. Nonlinear differential equations governing the harvester dynamics are obtained based on the Hamilton extended principle and solved using the direct harmonic balance method. Numerical results are presented for an actual energy harvester subjected to a dual-frequency excitation. It is ascertained that multi-frequency excitation and exploiting combination and simultaneous resonance result in a significant enhancement in the harvester output voltage and power. It is also found that simultaneous resonance is more effective in improving the harvester performance than combination resonances https://tava.isav.ir/article_251686_25c85a05eb1156c5c4229739d35f1c1d.pdf