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A Tuning Fork Frequency Up-Conversion Energy Harvester.

Qinghe Wu1, Shiqiao Gao1, Lei Jin1

  • 1State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.

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|November 13, 2021
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Summary
This summary is machine-generated.

This study introduces a novel tuning fork structure for frequency up-conversion energy harvesting. It efficiently converts low-frequency vibrations into usable power, demonstrating excellent performance for powering sensors and portable devices.

Keywords:
energy harvesterfrequencypiezoelectrictuning forkvibration mode

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Energy Harvesting

Background:

  • Traditional energy harvesters struggle with low-frequency vibrations.
  • Efficient power generation is crucial for wireless sensor nodes and portable electronics.
  • Frequency up-conversion mechanisms offer a potential solution for low-frequency energy harvesting.

Purpose of the Study:

  • To propose and validate a novel tuning fork structure for self-frequency up-conversion energy harvesting.
  • To demonstrate simultaneous low-frequency energy collection and high-frequency energy conversion.
  • To assess the performance of the proposed energy harvester in a low-frequency vibration environment.

Main Methods:

  • Design and fabrication of a novel tuning fork structure with in-phase and anti-phase vibration modes.
  • Theoretical analysis of the energy harvesting mechanism.
  • Experimental validation of the structure's performance under vibration.
  • Integration with a humidity sensor to demonstrate stable operation.

Main Results:

  • The proposed tuning fork structure achieved a peak voltage of 41.8 V and peak power of 8.74 mW at 7.3 Hz and 0.7 g acceleration.
  • Simultaneous collection of low-frequency energy and high-frequency energy conversion was demonstrated.
  • The energy harvester enabled stable operation of a humidity sensor.
  • Excellent output power was achieved in a low-frequency vibration environment.

Conclusions:

  • The novel tuning fork structure offers excellent performance for frequency up-conversion energy harvesting.
  • This technology has significant potential for powering wireless sensor nodes and portable vibration storage devices.
  • The proposed device is particularly suitable for monitoring environments related to human movement.