Electro-Mechanical Coupling Analysis of L-Shaped Three-Dimensional Braided Piezoelectric Composites Vibration Energy Harvester.

As the braided angle continues to increase, the first three-order resonant frequencies show a decreasing trend.

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In the analysis of the data in Table 5 , we observe a significant trend, namely as the braided angle is raised from 20° to 40°, a significant decrease in the probed axial modulus of elasticity E 11 is observed, from 28.49 GPa to 18.59 GPa.

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The data in the figure reveal a clear trend; namely as the mass of mass block B gradually increases, the output voltage of the L-shaped 3D BPCEH increases accordingly.

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