Abstract
This study introduces design methods of natural frequency for double-piezoelectric cantilever beams in order to absorb electricity from mechanical vibration. The natural frequencies of double cantilever beams are designed by quadratic equation such as 6.45 and 18.14 Hz. On the other hands, FEA is used to recheck the result. FEA simulation presents the natural frequencies such as 4.4614, 8.4793, 13.8020 and 25.1050 Hz. It works in low frequency and large bandwidth. The experimental results show the peak electric power at 5 and 22 Hz. The error may occur by stiffness of piezoelectric and effective of mounting position.
Highlights
Piezoelectric is used to convert vibration energy to electricity
The most piezoelectric cantilever beam is designed only one frequency, it has a natural frequency related to ambient vibration sources [1]
Double-piezoelectric cantilever beams in this study are designed for low frequency
Summary
Piezoelectric is used to convert vibration energy to electricity. It is usually attached on mechanism, which absorb some force or pressure. Piezoelectric generate electricity relative to amount stress and strain That it obtains good performance of high frequency. The most piezoelectric cantilever beam is designed only one frequency, it has a natural frequency related to ambient vibration sources [1]. Several papers [2,3,4,5] present the multiple cantilever beam arrays It increases bandwidth and electric power for scavenge vibration energy ambient. It advantages more than single cantilever beam. Multiple cantilever beams stacked to increase the bandwidth of natural frequencies It is well known as piezoelectric cantilever beam arrays. This paper deals quadratic equation and finite element method (FEM) for tuning natural frequency of the double-piezoelectric cantilever beams.
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