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The Optimal Design and Analysis of Piezoelectric Cantilever Beams for Power Generation Devices

Published online by Cambridge University Press:  01 February 2011

Dongna Shen ,
Jyoti Ajitsaria ,
Song-Yul Choe  and
Dong-Joo Kim
Dongna Shen
Affiliation:
shendon@auburn.edu, Auburn University, 276 Wilmore Lab, Auburn, AL, 36849, United States
Jyoti Ajitsaria
Affiliation:
ajitsjk@auburn.edu, Auburn University, Mechanical Engineering, United States
Song-Yul Choe
Affiliation:
choeson@auburn.edu, Auburn University, Mechanical Engineering, United States
Dong-Joo Kim
Affiliation:
dkim@eng.auburn.edu, Auburn University, Materials Research and Education Center, United States
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Abstract

With the rapid development of wireless remote sensor systems, battery is becoming the limiting factor in the lifetime of the device and miniaturization. As a way to eliminate battery in the system, the conversion of ambient vibration energy has been addressed. The piezoelectric cantilever beam with a proof mass was exploited for energy conversion since it can generate large strain and power density. The design of cantilever beams was optimized through numerical analysis and FEM simulation at higher acceleration condition. The investigated parameters influencing the output energy of piezoelectric bimorph cantilevers include dimensions of cantilever beam and proof mass. The resonant frequency and robustness of cantilever structure were also considered for enhancing power conversion efficiency and implementing devices at high acceleration condition. The power density generated by the optimized piezoelectric device was high enough (> 1200 μW/cm3) to operate microsensor systems. However, high stress near clamping area of cantilever beam could lead to the fracture at high acceleration condition.

Keywords

piezoelectricdevicescomposite
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 888: Symposium V – Materials and Devices for Smart Systems II , 2005 , 0888-V03-04
Copyright
Copyright © Materials Research Society 2006

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References

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