Piezoelectric Composite with Tapered Beam
First Claim
1. An energy harvesting device, comprising a composite structure including a base spring and a piezoelectric structure, wherein said piezoelectric structure is mounted on said base spring, wherein said base spring has a base spring effective thickness, wherein said piezoelectric structure has a piezoelectric structure effective thickness, wherein said piezoelectric structure effective thickness is greater than said base spring effective thickness.
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Abstract
An energy harvesting system includes a composite structure that includes a base spring and a first piezoelectric element. The first piezoelectric element is mounted on the base spring. The base spring has a base spring thickness, a base spring length, and a base spring width. The base spring is for vibrating around an axis parallel to the base spring width. The base spring thickness varies from position to position along a direction parallel to the base spring length. The base spring thickness varies to provide the first piezoelectric element with constant strain when the base spring vibrates around the axis parallel to the base spring width.
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Citations
37 Claims
- 1. An energy harvesting device, comprising a composite structure including a base spring and a piezoelectric structure, wherein said piezoelectric structure is mounted on said base spring, wherein said base spring has a base spring effective thickness, wherein said piezoelectric structure has a piezoelectric structure effective thickness, wherein said piezoelectric structure effective thickness is greater than said base spring effective thickness.
- 4. An energy harvesting device, comprising a composite structure including a base spring and a first piezoelectric element, wherein said base spring includes a first side, wherein said first piezoelectric element is mounted on said first side, wherein said base spring has a base spring thickness, wherein said base spring thickness tapers, wherein said base spring has a base spring maximum thickness, wherein said first piezoelectric element has a first piezoelectric element thickness, wherein said base spring maximum thickness is greater than said first piezoelectric element thickness.
- 7. An energy harvesting device, comprising a composite structure including a base spring and a first piezoelectric element, wherein said first piezoelectric element is mounted on said base spring, wherein said base spring has a base spring thickness, a base spring length, and a base spring width, wherein said base spring is for vibrating around an axis parallel to said base spring width, wherein said base spring thickness varies from position to position along a direction parallel to said base spring length, wherein said base spring thickness varies to provide said first piezoelectric element with constant strain when said base spring vibrates around said axis parallel to said base spring width.
Specification