Shape and geometrical parameter effects of a bimorph piezoelectric beam on energy harvesting performance

Document Type: Research Paper

Authors

1 M.Sc. of Mechanical Engineering, Faculty of Engineering, Islamic Azad University of Ahvaz, Iran

2 Department of Mechanical Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz,Ahvaz, Iran

Abstract

In this paper, the shape influence of piezoelectric beams including triangle, trapezoid, rectangle, inverted trapezoid, convex parabola, concave parabola, and comb-shaped (a combination of two triangular beams with a connector of 4 mm length) are addressed and analyzed by FEM. The analysis is performed for a bimorph piezoelectric beam. The analyzed parameters include the beam length, thickness and width of the piezoelectric layer. The study is performed using COMSOL Multiphysics software for all seven shapes. The results show that due to the mechanical properties of the beams, the natural frequency of the triangular beam is more for all considered parameters. In addition, as the width of the beam end increases, the natural frequency reduces, too. Since natural frequency is inversely related to electric power, the inverted trapezoidal beam has the highest electric power and the triangular beam has the lowest one.

Keywords

Main Subjects

[1] Mitcheson, P. D., Green, T. C., Yeatman, E. M., & Holmes, A.S., Architectures for vibration-driven micro-power generators, Journal of Micro-Electromechanical Systems, 13, 429-440, 2004.

[2] Miyazaki, M., Tanaka, H., Ono, G., Nagano, T., Ohkubo, N., Kawahara, T., & Yano, K., Electric-energy generation using variable-capacitive resonator for power-free LSI: Efficiency analysis and fundamental experiment, Low Power Electronics and Design, 2003. ISLPED '03. Proceedings of the 2003 International Symposium on, Seoul: South Korea, 193-198, 2003.

[3] Torah, R. N., Beeby, S. P., Tudor, M. J., O’Donnell, T., & Roy, S., Development of a cantilever beam generator employing vibration energy harvesting, The 6th Int. Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (Power MEMS 2006), United States, 181-184, 2006.

[4] Roundy, S., Wright, P. K., & Rabaey, J., A study of low level vibrations as a power source for wireless sensor nodes, Computer Communications, 26, 1131-1144, 2003

[5] Zhu, D., Beeby, S., Tudor, J., White, N., & Harris, N., Improving output power of piezoelectric energy harvesters using multilayer structures, Procedia Engineering, 25, 199-202, 2011.

[6] Liu, Z., Lia, L., Modeling of energy harvesting device with segmented piezoelectric layer. Elsevier, 47, 470- 473, 2012.

[7] Kumar, A., Sharma, A., Kumar, R., Vaish, R., & Vishal, S. Ch., Finite element analysis of vibration energy harvesting using lead-free piezoelectric materials: A comparative study, Journal of Asian Ceramic Societies, 2(2), 138-143, 2014.

[8] Reddy, A. R., Umapathy, M. M., Ezhilarasi, D., & Uma, G., Cantilever beam with trapezoidal cavity for improved energy harvesting, International Journal of Precision Engineering and Manufacturing, 16(8), 1875-1881, 2014.

[9] Mateu, L., Moll, F., Optimum piezoelectric bending beam structure for energy harvesting using shoe inserts, Journal of Intelligent Material Systems and Structures, 16(10), 835-845, 2005.                                      

[10] Lu, F., Lee, H.P., Lim, S.P., Modelling and analysis of micro piezoelectric power generators for micro-electromechanical systems applications, Smart Materials and Structures, 13(1), 57-63, 2004.

[11] IEEE standard on piezoelectricity. New York, 1987.

[12] Williams C. B., & Yates R. B., Analysis of a micro-electric generator for microsystems, Sensors and Actuators A: Physical, 52(3), 8-11, 1996.

[13] Vierck, R. K., Vibration analysis (2nd ed.). New York: Crowell Company, 1978.                 

[14] Momeni, M., Modeling of Piezoelectric Energy Harvesters to Improve Electrical Output Power Using Finite Element Method , 3rd International Engineering materials & Metallurgy conference, 2014.

[15] Roundy, S., Wright, P.K., A piezoelectric vibration based generator for wireless electronics, Smart Materials and Structures, 13(5), 1131-1142, 2004.                                                                              

[16] Kianpour, A, Jahani, K, The effect of geometrical parameters on performance of piezoelectric harvesters under basic harmonic vibrations using finite element method, Journal of Asian Ceramic Societies, 2(2), 138-143, 2014.                  

[17] Pan, C.T., Liu, Z. H., Chen, Y. C., & Liu, C. F., Design and fabrication of Flexible piezo-microgenerator by depositing ZnO thin films on PET substrates, Sensors and Actuators A: Physical, 159(1), 96-104, 2010.    

[18] Sharpes, N., Abdelkefi, A., & Priya, Sh., Two-dimensional concentrated stress low-frequency piezoelectric vibration energy harvesters, Applied Physics Letters, 107(9), 093901, 2015.