Abstract
Embedded wireless sensing networks (WSNs) provide effective solutions for structural health monitoring (SHM), where how to provide long-term electric power is a bottle-neck problem. Piezoelectric vibration energy harvesting (PVEH) has been widely studied to realize self-powered WSNs due to piezoelectric effect. Structural vibrations are usually variable and exist in the form of elastic waves, so cantilever-like harvesters are not appropriate. In this paper, one kind of two-dimensional (2D) piezoelectric metamaterial plates with local resonators (PMP-LR) is investigated for structural vibration energy harvesting. In order to achieve low-frequency and broadband PVEH in SHM, it is highly necessary to study dynamic characteristics of PMP-LR, particularly bandgaps. Firstly, an analytical model is developed based on the Kirchhoff plate theory, and modal analysis is done by using the Rayleigh–Ritz method. Then, effects of geometric and material parameters on vibration bandgaps are analyzed by finite element-based simulations. In the end, experiments are carried out to validate the simulated results. The results demonstrate that the location of bandgaps can be easily adjusted by the design of local resonators. Therefore, the proposed method will provide an effective tool for optimizing local resonators in PMP-LR.
Highlights
Structural health monitoring (SHM) is the process of detecting the states of aerospace, civil, and mechanical infrastructure during their lives [1]
Most monitoring systems for SHM are wired in a wide area or in a harsh environment, resulting in both economical and practical limitations. anks to the development of MEMS technologies, many microsensors can be embedded into engineering structures and useful signals can be transmitted wirelessly, such as acceleration, strain, and so on. us, embedded wireless sensing network (WSN) provides effective solutions for SHM
These local resonators act as local absorbers of mechanical vibrations and electric charges can be generated from the strain field based on the piezoelectric effect. e other one is to connect these unit cells to interface circuits, which are optimized to transform and store the harvested power based on the electromechanically coupled model of the whole system. is paper will focus on the first step, and one kind of two-dimensional (2D) piezoelectric metamaterial plates is investigated for vibration energy harvesting
Summary
Structural health monitoring (SHM) is the process of detecting the states of aerospace, civil, and mechanical infrastructure during their lives [1]. Aridogan et al [10] derived analytical closed-form expressions of piezoelectric patch-based energy harvesters structurally integrated to fully clamped plates. E first one is to optimize the bandgaps so that targeted broadband and low-frequency vibrations can be localized in some unit cells based on locally resonant mechanism. In this case, these local resonators act as local absorbers of mechanical vibrations and electric charges can be generated from the strain field based on the piezoelectric effect. Erefore, this study aims to develop an electromechanically coupled analytical model based on the Kirchhoff plate theory to analyze vibration bandgaps of the PMP-LR, which are strongly related to its geometric and material properties.
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