Smart Structures and Systems

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A new broadband energy harvester using propped cantilever beam with variable overhang

  • Usharani, R. (Department of Instrumentation and Control Engineering, Seshasayee Institute of Technology) ;
  • Uma, G. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Umapathy, M. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Choi, S.B. (Department of Mechanical Engineering, Inha University)
  • Received : 2016.08.29
  • Accepted : 2017.04.18
  • Published : 2017.05.25
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Abstract

Design of piezoelectric energy harvester for a wide operating frequency range is a challenging problem and is currently being investigated by many researchers. Widening the operating frequency is required, as the energy is harvested from ambient source of vibration which consists of spectrum of frequency. This paper presents a new technique to increase the operating frequency range which is achieved by designing a harvester featured by a propped cantilever beam with variable over hang length. The proposed piezoelectric energy harvester is modeled analytically using Euler Bernoulli beam theory and the effectiveness of the harvester is demonstrated through experimentation. The results from analytical model and from experimentation reveal that the proposed energy harvester generates an open circuit output voltage ranging from 36.43 V to 11.94 V for the frequency range of 27.24 Hz to 48.47 Hz. The proposed harvester produces continuously varying output voltage and power in the broadened operating frequency range.

Keywords

References

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