Vibrational energy harvesting from a monostable piezomagnetoelastic structure with multi-frequency excitation

Document Type : Invited by Davoud Younesian


1 M.Sc. Student, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran

2 Assistant Professor, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran


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


  • A monostable piezomagnetoelastic energy harvester is considered.
  • A multi-frequency excitation scheme is introduced.
  • Nonlinear resonances including combination and simultaneous resonances are studied.
  • It is found that the multi-frequency excitation improves the harvester performance.
  • Simultaneous resonance is more effective than combination resonance


Main Subjects

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