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Design Parameters Affecting the Performance of Vortex-Induced Vibration Harvesters.

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Optimizing vortex-induced vibration (VIV) harvesters involves extending piezoelectric patches and adjusting bluff body dimensions. Best energy harvesting occurs with a 20% patch length, long bluff body, and minimal mass, enhancing VIV energy generation.

Keywords:
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Area of Science:

  • Mechanical Engineering
  • Energy Harvesting
  • Vibrational Energy Conversion

Background:

  • Vortex-induced vibration (VIV) harvesters commonly use small piezoelectric patches near the cantilever clamp.
  • Optimal placement and design are crucial for maximizing energy harvesting efficiency.

Purpose of the Study:

  • To improve energy harvesting performance of VIV harvesters.
  • To investigate the effects of extended piezoelectric patch length and modified bluff body dimensions (length and mass).
  • To develop and validate a novel analytical model for predicting output voltage.

Main Methods:

  • Development of a novel analytical model based on dimensionless numbers to predict output voltage.
  • Fabrication of prototype harvesters with varying designs.
  • Experimental determination of natural frequencies and damping ratios.
  • Wind tunnel testing to assess energy harvesting performance.

Main Results:

  • The analytical model identifies key design parameters influencing harvester performance.
  • Optimal performance was achieved with a piezoelectric patch length of approximately 20% of the cantilever length.
  • A long bluff body with minimal mass yielded the best energy harvesting results.
  • Experimental findings align with the predictions of the analytical model.

Conclusions:

  • Extending piezoelectric patch length and optimizing bluff body design significantly enhance VIV harvester performance.
  • The developed analytical model provides valuable guidance for designing and interpreting experiments.
  • Minimal bluff body mass and extended patch length are critical for efficient VIV energy harvesting.