Random Effects in a Nonlinear Vibration-Based Piezoelectric Energy Harvesting System
Abstract
Vibration-based energy harvesting is of increasing importance and there is a current challenge to improve energy harvesting capacity exploiting nonlinear and random effects. This article investigates random effects in a nonlinear energy harvesting system. The system is represented by a magnetoelastic structure with two piezoceramic layers attached to the root of a cantilever beam, obtaining a bimorph generator. The energy harvesting system is subjected to three excitation conditions: pure harmonic, pure random and a combination of harmonic and random excitations. Noise-to-Signal Ratio (NSR) is employed to quantify different combinations of the forcing terms, establishing a procedure to evaluate the system performance. This approach is based on Power Spectral Density (PSD) of input and output signals. Numerical simulations are carried out, identifying the better combinations of harmonic and random excitations for energy harvesting purposes. Discussions about the influence of the kind of response are carried out evaluating the differences between periodic and chaotic motions. Conclusions show that both random and nonlinear effects can be tuned in order to enhance energy harvesting capacity.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 01, 2019
- Source ID
- 10.1142/s0218127419500469
Entities
People
- Adriano Todorovic Fabro
- Aline Souza de Paula
- Marcelo Amorim Savi
- Tiago Leite Pereira
Organizations
- Air Force Office of Scientific Research
- Alberto Luiz Coimbra Institute of Post-Graduation and Research in Engineering
- Coordenação de Aperfeicoamento de Pessoal de Nível Superior
- Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
- National Council for Scientific and Technological Development
- University of Brasília