Abstract
The continuous reduction in power consumption of wireless sensing electronics has led to immense research interests in vibration energy harvesting techniques for self-powered devices. Currently, most vibration-based energy harvesters are designed as linear resonators that only work efficiently with limited bandwidth near their resonant fre-quencies. Unfortunately, in the vast majority of practical scenarios, ambient vibrations are frequency-varying or totally random with energy distributed over a wide fre-quency range. Hence, increasing the bandwidth of vibra-tion energy harvesters has become one of the most critical issues before these harvesters can be widely deployed in practice.This paper presents the simulation results of high frequency harvester composed from circular piezoelectric bimorph. A high frequency piezoelectric generator is pro-posed, because that during material cutting excited high frequency vibrations could be useful for the excitation of circular piezoelectric transducer bimorphs. The broadband vibration energy harvesting possibility is achieved by changing circular plate shape and constraints conditions. Self-powered wireless sensor node is elaborated for smart cutting tools applications.DOI: http://dx.doi.org/10.5755/j01.mech.20.5.7902
Highlights
Wireless sensors are conventionally powered by chemical batteries
Pervasive vibration sources are suitable for small-scale power generation of low-power electronics and have attracted more research attention
No matter which principle was exploited, most of the previous research work focused on designing a linear vibration resonator, in which the maximum system performance is achieved at its resonant frequency
Summary
Wireless sensors are conventionally powered by chemical batteries. The use of batteries leads to their costly replacement especially for sensors at inaccessible locations, and causes pollution to the environment. In the past few years, ambient energy harvesting as power supplies for small-scale electronics has evoked great research interest in various disciplines, including material science, mechanical, civil, and electrical engineering. Current solutions for vibration-toelectricity transduction are mostly accomplished via electrostatic, electromagnetic or piezoelectric methods [2]. Paper [5] presents a review of recent advances in broadband vibration energy harvesting. Most harvesters in the literature operate at frequencies of less than 100 Hz, harvesting of energy from high frequency (1–10 kHz) vibrations, such as cutting tool motions [8], is desirable for powering wireless sensor nodes. This paper presents a high frequency driven, resonant, coupled vibration piezoelectric harvester that comprises circular piezoelectric bimorph.
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