Vibration energy scavenging via piezoelectric bimorphs of optimized shapes

Compact autonomous power sources are one of the prerequisites for the development of wireless sensor networks. In this work vibration energy harvesting via piezoelectric resonant bimorph beams is studied. The available analytical approaches for the modeling of the coupled electromechanical behavior are critically evaluated and compared with a finite element (FEM) numerical model. The latter is applied to analyze thoroughly the stress and strain states, as well as to evaluate the resulting voltage and charge distributions in the piezoelectric layers. The aim of increasing the specific power generated per unit of scavenger volume is pursued by optimizing the shape of the scavengers. Two optimized trapezoidal configurations are hence identified and analyzed. An experimental set-up for the validation of the proposed numerical model and of the obtained optimized structures is developed. Results of a preliminary experimental assessment, confirming the improved performances of optimized scavengers, are finally given.

[1]  Jan M. Rabaey,et al.  Improving power output for vibration-based energy scavengers , 2005, IEEE Pervasive Computing.

[2]  Henry A. Sodano,et al.  A review of power harvesting using piezoelectric materials (2003–2006) , 2007 .

[3]  Paul K. Wright,et al.  A piezoelectric vibration based generator for wireless electronics , 2004 .

[4]  F. Moll,et al.  Optimum Piezoelectric Bending Beam Structures for Energy Harvesting using Shoe Inserts , 2005 .

[5]  Peter Woias,et al.  Characterization of different beam shapes for piezoelectric energy harvesting , 2008 .

[6]  G. Genta.  Vibration of structures and machines , 1993 .

[7]  Joseph A. Paradiso,et al.  Human Generated Power for Mobile Electronics , 2004 .

[8]  Daniel J. Inman,et al.  An experimentally validated bimorph cantilever model for piezoelectric energy harvesting from base excitations , 2009 .

[9]  Sumi Helal,et al.  The Engineering Handbook of Smart Technology for Aging, Disability, and Independence , 2008 .

[10]  Daniel J. Inman,et al.  Issues in mathematical modeling of piezoelectric energy harvesters , 2008 .

[11]  S. M. Shahruz,et al.  Limits of performance of mechanical band-pass filters used in energy scavenging , 2006 .

[12]  George P. Simon,et al.  Characterization of mechanical vibration damping by piezoelectric materials , 1996 .

[13]  S. Beeby,et al.  Energy harvesting vibration sources for microsystems applications , 2006 .

[14]  D. Guyomar,et al.  Toward energy harvesting using active materials and conversion improvement by nonlinear processing , 2005, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[15]  Daniel J. Inman,et al.  Energy Harvesting Technologies , 2008 .

[16]  Stefano Carabelli,et al.  Electromechanical Tuning of Self-Sensing Piezoelectric Transducers , 1998 .

[17]  Jan G. Smits,et al.  The constituent equations of piezoelectric bimorphs , 1991 .

[18]  Daniel J. Inman,et al.  On the optimal energy harvesting from a vibration source using a PZT stack , 2009 .

[19]  Nahid Shahmehri,et al.  People with Special Needs and Traffic Safety , 2008 .

[20]  Joseph A. Paradiso,et al.  Energy scavenging for mobile and wireless electronics , 2005, IEEE Pervasive Computing.