A graded metamaterial for broadband and high-capability piezoelectric energy harvesting

• DOI: 10.1016/j.enconman.2022.116056
• Publication Date: 2022-08-06T17:32:36Z
• Authors: Bao Zhao; Henrik R. Thomsen; Jacopo M. De Ponti; Emanuele Riva; Bart Van Damme; Andrea Bergamini; Eleni Chatzi; Andrea Colombi
• Keywords: Piezoelectric energy harvesting; Spatial frequency separation; FOS: Physical sciences; Physics - Applied Physics; Applied Physics (physics.app-ph); 02 engineering and technology; Graded metamaterial; 0210 nano-technology; Slow-wave phenomenon; 7. Clean energy

This work proposes a graded metamaterial-based energy harvester integrating the piezoelectric harvesting function targeting low-frequency ambient vibrations (<100 Hz). The combines metamaterial with beam-like resonators, patches, and self-powered interface circuit for broadband high-capability harvesting. Firstly, an integrated lumped parameter model is derived from both mechanical electrical sides to determine power performance of proposed design. Secondly, thorough numerical simulations are carried out optimize grading profile wave field amplification, as well highlight effects spatial-frequency separation slow-wave phenomenon on efficiency. Finally, experiments realistic vibration sources validate theoretical results sides. Particularly, harvested design yields five-fold increase respect conventional solutions based single cantilever harvesters. Our reveal that by bridging advantages metamaterials targets harvesting, shows significant potential realizing Internet Things devices.