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Bidirectional Piezoelectric Energy Harvester.

Andrius Čeponis1, Dalius Mažeika2, Artūras Kilikevičius3

  • 1Department of Engineering Graphics, Faculty of Fundament Sciences, Vilnius Gediminas Technical University, Sauletekio avn., 11, LT-10223 Vilnius, Lithuania. andrius.ceponis@vgtu.lt.

Sensors (Basel, Switzerland)
|September 7, 2019
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Summary

This study introduces a novel bidirectional piezoelectric energy harvester capable of generating power from vibrations in two directions. Optimized through numerical and experimental analysis, it achieves stable output for various excitation types.

Keywords:
bidirectional excitationcantilever arrayenergy harvesting

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Electrical Engineering

Background:

  • Vibrational energy harvesting is crucial for powering autonomous sensors and devices.
  • Piezoelectric materials offer efficient conversion of mechanical stress to electrical energy.
  • Existing harvesters often lack efficiency in multi-directional or impact-based scenarios.

Purpose of the Study:

  • To numerically and experimentally investigate a bidirectional piezoelectric energy harvester.
  • To optimize geometrical parameters for enhanced energy harvesting performance.
  • To analyze the harvester's electrical and mechanical characteristics under different excitation conditions.

Main Methods:

  • Developed a bidirectional piezoelectric energy harvester with two cantilevers and seismic masses.
  • Employed numerical simulations to determine optimal geometric configurations.
  • Conducted experimental validation under harmonic and impact-based base excitations.

Main Results:

  • Achieved maximum output powers of 16.85 µW (y-direction) and 15.94 µW (z-direction) under harmonic excitation.
  • Obtained maximum power outputs of 4.059 nW/N (y-direction) and 3.1 nW/N (z-direction) under impact-based excitation.
  • Demonstrated stable power output across both harmonic and impact-based vibrations.

Conclusions:

  • The bidirectional piezoelectric energy harvester effectively captures energy from multi-directional vibrations.
  • Numerical optimization successfully improved the harvester's performance.
  • The device shows potential for powering low-power electronics in dynamic environments.