Design and performance of variable-shaped piezoelectric energy harvesters
- 7 June 2013
- journal article
- Published by SAGE Publications in Journal of Intelligent Material Systems and Structures
- Vol. 25 (2) , 174-186
Abstract
We investigate the effects of shape variations of a cantilever beam on its performance as an energy harvester. The beam is composed of piezoelectric and metallic layers (unimorph design) with a rigid mass attached to its free end. A reduced-order model based on a one-mode Galerkin approach is derived. Solutions for the tip displacement, generated voltage, and harvested power are then obtained. Linear and quadratic shape variations are considered in order to design piezoelectric energy harvesters that can generate energy at low frequencies and maximize the harvested energy. The results show that the fundamental natural frequency and mode shape are strongly affected when the shape of the beam is varied. The influence of the electrical load resistance and the shape parameters at resonance on the system’s performance is discussed. It is determined that for specific resistance values, the quadratic shape can yield up to two times the energy harvested by a rectangular shape.Keywords
This publication has 20 references indexed in Scilit:
- Piezoelectric energy harvesting from transverse galloping of bluff bodiesSmart Materials and Structures, 2012
- An energy harvester using piezoelectric cantilever beams undergoing coupled bending–torsion vibrationsSmart Materials and Structures, 2011
- Effects of nonlinear piezoelectric coupling on energy harvesters under direct excitationNonlinear Dynamics, 2011
- Vibration energy scavenging via piezoelectric bimorphs of optimized shapesMicrosystem Technologies, 2009
- An experimentally validated bimorph cantilever model for piezoelectric energy harvesting from base excitationsSmart Materials and Structures, 2009
- Characterization of different beam shapes for piezoelectric energy harvestingJournal of Micromechanics and Microengineering, 2008
- Powering MEMS portable devices—a review of non-regenerative and regenerative power supply systems with special emphasis on piezoelectric energy harvesting systemsSmart Materials and Structures, 2008
- A review of power harvesting using piezoelectric materials (2003–2006)Smart Materials and Structures, 2007
- A laser-micromachined multi-modal resonating power transducer for wireless sensing systemsSensors and Actuators A: Physical, 2002
- Design and fabrication of a new vibration-based electromechanical power generatorSensors and Actuators A: Physical, 2001