A two-degree-of-freedom cantilever beam piezoelectric generator was explored to improve the generation performance of the cantilever beam piezoelectric generator under the variety of the ambient vibration energy sources. The theoretical model of the frequency characteristics of the two-degree-of-freedom cantilever beam piezoelectric generator was established and finite element analysis was performed for the proposed theoretical model. The theoretical results show that the theoretical analysis and finite element simulation are in agreement well. A numerical simulation was carried out for the frequency characteristic model of the two-degree-of-freedom cantilever beam piezoelectric generator and the results show that the ratio of the 1st modal frequency to the 2nd modal frequency will be a minimum value with the increase of the length ratio
width ratio
thickness ratio and the mass ratio
and the minimum value of the ratio of the 1st modal frequency to the 2nd modal frequency can be obtained at the length ratio of 0.8
width ratio of 2.0
thickness ratio of 1.0
and the mass ratio of 0.5. The results demonstrate that the frequency-band of the two-degree-of-freedom cantilever beam piezoelectric generator is expanded by optimizing the structure parameters to reduce the distance between the 1st modal frequency and the 2nd modal frequency. Finally
the two-degree-of-freedom cantilever beam piezoelectric generator was designed and the broadband generation performance of the generator verified.
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references
DAI H L, ABDELKEFI A, WANG L. Theoretical modeling and nonlinear analysis of piezoelectric energy harvesting from vortex-induced vibrations[J]. Journal of Intelligent Material Systems and Structures, 2014, 25(14):1861-1874.
ARRIETA A F, DELPERO T, BERGAMONI A E, et al.. Broadband vibration energy harvesting based on cantilevered piezoelectric bi-stable composites[J]. Applied Physics Letters, 2013, 102(17):173904.
ROUNDY S, LELAND E S, BAKER J, et al.. Improving power output for vibration-based energy scavengers[J]. IEEE Pervasive Computing, 2005, 4(1):28-36.
SHAHRUZ S M. Design of mechanical band-pass filters with large frequency bands for energy scavenging[J]. Mechatronics, 2006, 16(9):523-531.
KIM H W, BATRA A, PRIYA S, et al.. Energy harvesting using a piezoelectric cymbal transducer in dynamic environment[J]. Japanese Journal of Applied Physics, 2004, 43(6):178-183.
ERTURK A, RENNO J M, INMAN D J. Piezoelectric energy harvesting from a L-shaped beam-mass structure with an application to UAVs[J]. Journal of intelligent material systems and structures, 2009, 20(5):529-544.
FEENSTRAA J, GRANSTROMA J, SODANO H. Energy harvesting through a backpack employing a mechanically amplified piezoelectric stack[J]. Mechanical Systems and Signal Processing, 2008, 22(3):721-734.
LIU Y, WANG Y F, LI G, et al.. MEMS-based low-frequency piezoelectric vibration energy harvester[J]. Opt. Precision Eng., 2014, 22(9):2476-2482.(in Chinese)
WANG SH Y, KAN J W, WANG H Y, et al.. Piezoelectric energy generator based on deflection-limiting circular arc[J]. Opt. Precision Eng., 2013, 21(2):342-348.(in Chinese)
KAN J W, WANG SH Y, PENG SH F, et al.. Output performance of piezoelectric generators with multi-vibrators[J]. Opt. Precision Eng., 2011, 19(9):2108-2116.(in Chinese)
HE X F, DU ZH G, ZHAO X Q, et al.. Modeling and experimental verification for cantilevered piezoelectric vibration energy harvester[J]. Opt. Precision Eng., 2011, 19(8):1771-1778.(in Chinese)
YU H H, WEN ZH Y, WEN ZH Q, et al.. The design of piezoelectric vibration based generator with wide bandwidth[J]. Chinese Journal of Sensors and Actuators, 2010, 23(5):643-646.(in Chinese)
ARROYO E, BADEL A, FORMOSA F. Energy harvesting from ambient vibrations:electromagnetic device and synchronous extraction circuit[J]. Journal of Intelligent Material Systems and Structures, 2013, 24(16):2023-2035.
CEPNIK C, YEATMAN E M, WALLRABE U. Effects of nonconstant coupling through nonlinear magnetics in electromagnetic vibration energy harvesters[J]. Journal of Intelligent Material Systems and Structures, 2012, 23(13):1533-1541.
MITCHESON P D, MIAO P, STARK B H, et al.. MEMS electrostatic micropower generator for low frequency operation[J]. Sensors and Actuators A, 2004, 115(2-3):523-529.
BAGINSKY I L, KOSTSOV E G, KAMISHLOV V F. Two-capacitor electrostatic microgenerators[J]. Engineering, 2013, 5(11A):9-18.
方同, 薛璞.振动理论及应用[M].西安:西北工业大学出版社, 1998.
FANG T, XUE P.Vibration theory and application[M]. Xi'an:Northwestern Polytechnical University Press, 1998.(in Chinese)