What is the structure frequency of a vibration-based energy harvesting device?
Based on the generic spring–mass–damper model of vibration-based energy harvesting discussed in Section 2, in order to maximize the use of the energy harvesters for a particular application, the structure frequency of the energy harvesting device is designed to match the source frequency (ωstruc = ωs).
What are vibration-based energy harvesting mechanisms?
We start by providing an overview of four vibration-based energy harvesting mechanisms, including piezoelectric, electromagnetic, electrostatic, and triboelectric energy harvesting. It is to be noted that frequency is most essential property of the vibration.
What is a vibration-based energy harvesting device?
Typical vibration-based energy harvesting devices, whether they make use of the piezoelectric effect, electrostatic or another mechanism, tend to optimally operate at frequencies greater than 100 Hz and so the main operating frequencies of some of the primary periodic mechanical motions of the human body are difficult to design for.
What is vibrational energy?
The human body has a wealth of vibrational energy available for harvesting, but most of it is in the form of low frequency vibrations, such as the beating of the heart, the cycle of air exchange in the lungs, or the human gait while walking or running.
How can a vibration-based energy harvesting array become a self-excited device?
To transform a vibration-based energy harvesting array into a self-excited, or a self-charge, device, one of the primary requirements is to identify potential vibration sources in the surrounding environment. Among various vibration sources, an especially promising vibration source is created by flow-induced vibration.
What is the resonant frequency range for harvesting vibration energy?
Thus, the applicable frequency range for harvesting vibration energy lies between 6.5 and 71 Hz, which is achieved by combining these two types of piezo films. Figure 7. Variation in the adjusted resonant frequencies from the modeled and experimental results for the first vibration mode of ( a) DT1-028K and ( b) DT2-028K [ 26 ].
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