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Piezoelectric vibrational energy harvesting systems incorporating parametric bending mode energy harvesting

  • US 8,080,920 B2
  • Filed: 03/21/2008
  • Issued: 12/20/2011
  • Est. Priority Date: 03/21/2007
  • Status: Active Grant
First Claim
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1. A vibrational energy harvester, comprising:

  • a resonator beam having transverse cross-sectional flexural properties, a fundamental resonance frequency in a first bending direction that is a function of said transverse cross-sectional flexural properties and a parametric mode frequency in a second bending direction perpendicular to said first bending direction, wherein said parametric mode frequency is a function of said transverse cross-sectional flexural properties and said transverse cross-sectional flexural properties are selected to tune said fundamental resonance frequency to a first desired frequency and to tune said parametric mode frequency to a second desired frequency, said resonant beam including piezoelectric material for generating electrical energy in response to bending of said resonator beam in each of said first and second bending directions when said resonator beam is vibrating at said first desired frequency and said second desired frequency.

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