Journal of Theoretical and Applied Vibration and Acoustics

Journal of Theoretical and Applied Vibration and Acoustics

Acoustic energy harvesting from sonic crystals with non-square lattices using piezoelectric patch

Document Type : Research Article

Authors
Saeed Sharifi Moghaddam
Saeed Ziaei-Rad
Reihaneh Hadipour Hafshejani
Reza Tikani
Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, IRAN.
10.22064/tava.2025.2023906.1233
Abstract
The field of energy harvesting from the environment has emerged as a significant area of research in recent years. Acoustic energy represents a natural source of mechanical energy that can be converted into electrical energy using metamaterials and piezoelectric materials. A defect was introduced into a regular lattice of the crystal. At the point of defect, a concentration of sound pressure was created, and by installing the PVDF piezoelectric patch, mechanical energy can be converted into electrical energy. In this study, an effort was made to identify a suitable model for maximum acoustic energy harvesting. The effect of various lattices, including circular, rhombus, rectangular, square-rhombic, square-rectangular, and rhombus-rectangular lattices, on the sound pressure level (SPL) and energy harvesting was investigated. Additionally, the impact of modifying the position of the defect and increasing the number of defects on the SPL was examined. The simulation results were calculated using COMSOL Multiphysics 6.0. The results were validated by comparing them with those of previous studies. Findings demonstrated that a square-rhombic lattice can provide the highest SPL and, consequently, the highest harvested energy. In the square-rhombic lattice, using the optimal resistance of 15 kΩ at the frequency of 4220.4 Hz yielded a voltage and power of 11.34 mV and 4.15 nW, respectively.

Highlights

  • Effect of non-square lattices on sound pressure level (SPL) and energy harvesting is investigated.
  • Effect of defect position and increasing the number of defects on the SPL is studied.
  • Sonic crystal with square-rhombic lattice is found best for harvesting acoustic energy.

Keywords
Energy harvesting
Sonic crystal
Piezoelectric
Metamaterial
Subjects