Piezoelectric Energy Harvesting from Broadband Random Vibrations
S Adhikari, MI Friswell (Swansea University) & DJ Inman (Virginia Tech, USA)
Smart Materials and Structures, Vol. 18, No. 11, November 2009, paper 115005
Energy harvesting for the purpose of powering low power electronic sensor systems has received explosive attention in the last few years. Most works use deterministic approaches focusing on using the piezoelectric effect to harvest ambient vibration energy have focused on cantilever beams at resonance using harmonic excitation. Here, using a stochastic approach, we focus on using a stack configuration and harvesting broadband vibration energy, a more practically available ambient source. It is assumed that the ambient base excitation is stationary Gaussian white noise which has a constant power-spectral density across the frequency range considered. The mean power acquired from a piezoelectric vibration-based energy harvester subjected to random base excitation is derived using the theory of random vibrations. Two cases, namely the harvesting circuit with and without an inductor have been considered. Exact closed-form expressions involving non-dimensional parameters of the electromechanical system have been given and illustrated using numerical examples.
This material has been published in the Journal of Smart Materials and Structures, Vol. 18, No. 11, November 2009, paper 115005, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by the Institute of Physics.
Link to paper using doi: 10.1088/0964-1726/18/11/115005
Smart Materials and Structures
The Institute of Physics