A periodic folded piezoelectric beam for efficient vibration energy harvesting

Document Type: Full Length Article

Authors

Department of Mechanical Engineering, Yazd University, Yazd 89195-741, Iran

10.22064/tava.2018.69901.1087

Abstract

Periodic piezoelectric beams have been used for broadband vibration energy harvesting in recent years. In this paper, a periodic folded piezoelectric beam (PFPB) is introduced. The PFPB has special features that distinguish it from other periodic piezoelectric beams. The Adomian decomposition method (ADM) is used to calculate the first two band gaps and
twelve natural frequencies of the PFPB. Results show that this periodic beam has wide band gaps at low frequency ranges and the band gaps are close to each other. Results also show that the PFPB can efficiently generate voltage from the localized vibration energy over the band gaps. The natural frequencies of the PFPB are close to each other and most of them are out of the band gaps. Therefore, the PFPB can also generate the maximum voltage over a relatively wide frequency range out of the band gaps. In order to show these features better, the voltage output of the PFPB over a wide frequency range is calculated using the ANSYS software and compared with that of a conventional piezoelectric energy harvester. The ANSYS is also used to validate the analytical results and good agreement is found.

Highlights

  • A periodic folded piezoelectric beam for vibration energy harvesting is introduced.
  • The ADM method is applied for vibration band gap and free vibration analysis.
  •  The proposed beam is found to have wide and close band gaps at low frequencies.
  • The beam is found to extract the maximum voltage over and out of the band gaps

Keywords

Main Subjects


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