Optimum Piezoelectric Bending Beam Structures for Energy Harvesting using Shoe Inserts

Abstract

The small amount of power demanded by many present-day electronic devices opens up the possibility to convert part of the energy present in the environment into electrical energy, using several methods. One such method is to use piezoelectric film-bending beams inside a shoe, and use part of the mechanical energy employed during normal walking activity. This study analyzes several bending beam structures suitable for the intended application (shoe inserts and walking-type excitation) and obtains the resulting strain for each type as a function of their geometrical parameters and material properties. As a result, the optimum configuration can be selected.

Keywords

energy harvesting piezoelectric films bending beams maximum deflection power generation

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References

Beer, F.P. and Johnston, E.R. 1993. Mechanics of Materials, McGraw-Hill, New York, NY .

Brown, R. 2002. Private correspondence with R. Brown. Measurement Specialties.

Eggborn, T. 2003. ‘Analytical Models to Predict Power Harvesting with Piezoelectric Materials,’ MSc Thesis, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.

Ikeda, T. 1990. Fundamentals of Piezoelectricity, Oxford Science Publications, Oxford .

Kendall, C. 1998. ‘Parasitic Power Collection in Shoe Mounted Devices,’ BSc Thesis, Massachusetts Institute of Technology, Massachusetts.

Kino, G.S. 2000. Acoustic Waves: Devices, Imaging, and Analog Signal Processing, Prentice-Hall, Inc., Englewood Cliffs, NJ .

Kymissis, J. , Kendall, C. , Paradiso, J. and Gershenfeld, N. 1998. ‘Parasitic Power Harvesting in Shoes,’ In: Second IEEE International Conference on Wearable Computing, pp. 132–139 .

Measurement Specialties. Piezo Film Sensors, Technical Manual, http://www.msiusa.com.

Paradiso, J. 2004. Private correspondence with J. Paradiso. Massachusetts Institute of Technology, Massachusetts .

10.

Roundy, S. , Wright, P.K. and Rabaey, J. 2004. Energy Scavenging for Wireless Sensor Networks with Special Focus on Vibrations, Kluwer Academic Publishers, Boston, MA .

11.

Senturia, S.D. 2001. Microsystem Design, Kluwer Academic Publishers, Boston, MA .

12.

Shenck, N. 1999. ‘A Demonstration of Useful Electric Energy Generation from Piezoceramics in a Shoe,’ MSc Thesis, Massachusetts Institute of Technology, Massachusetts.

13.

Shenck, N. and Paradiso, J. 2001. ‘Energy Scavenging with Shoe-Mounted Piezoelectrics,’ IEEE Micro, 21(3): 30–42 .

14.

Smits, J.G. and Choi, W. 1991. ‘The Constituent Equations of Piezoelectric Heterogeneous Bimorphs,’ IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 38(3): 256–270 .

15.

Starner, T. and Paradiso, J. 2004. ‘Human Generated Power for Mobile Electronics’.

16.

Yee, J.K. 2003. ‘Shock Resistance of Ferromagnetic Micromechanical Magnetometers,’ MSc Thesis, University of California, Los Angeles.

17.

Young, W.C. and Budynas, R.G. 2002. Roark's Formulas for Stress and Strain, McGraw-Hill, New York, NY .