Abstract
This paper presents a folded nonlinear electro‐magneto‐mechanical (EMM) vibration‐based piezoelectric energy harvester system, which is built on the cantilevered beam structure and consists of one host beam and two substrate plates. The performance of the linearity and nonlinearity to the proposed EMM system is evaluated and compared. Moreover, the voltage response in time history and the phase portrait are studied under an external rectifier circuit with a resistor. The results show that the nonlinearity of the reported EMM system changes the coherent resonance vibration mode from single to double under a harmonic base excitation within the frequency range of 20 Hz–50 Hz. Meanwhile, the substrate plate D contributes more averaged voltage output at a lower frequency while the substrate plate A contributes the voltage output at the relatively higher frequency for the nonlinear EMM system. The experimental study indicates that the proposed nonlinear EMM vibration‐based piezoelectric energy harvester can yield a total voltage of 8.133 V@35.53 Hz while the baseline structure only produces 1.724 V@38.81 Hz. In addition, the bandwidth range of high‐power output is enlarged by the nonlinear EMM system, which makes this device more flexible and applicable to absorb the wasted vibration energy generated by industrial machines and public facilities.
Highlights
The concepts of smart city and smart life have been attracting increasingly more attention by researchers and industry practitioners
By minimizing the vibration generated by one component that may pass to adjacent components, the adjacent components may vibrate less and last longer in their service lives. e vibration frequency from the rotational machine is usually small and harmful to the lifespan of the machines
The block A and block D were replaced by two permanent magnets with the same size and weight but opposite direction and the repulsive force between the two magnets would drive the two substrate plates vibrating in a nonlinear dynamic style under a given basis excitation
Summary
The concepts of smart city and smart life have been attracting increasingly more attention by researchers and industry practitioners. It is hard to design a model with a compacted multi-degree-offreedom structure coupled with the magnetic interaction, because its dynamic performance cannot be calculated directly due to the complicated structure parameters To fill this void in current research work, a folded nonlinear electro-magneto-mechanical (EMM) vibration-based piezoelectric energy harvester model is proposed in this paper. Is paper is organized as follows: In Section 2, the nonlinear EMM vibration-based piezoelectric energy harvester aluminum model and the derivation of mathematical governing motion equations are briefly introduced. Is nonlinear EMM system is composed of one cantilevered host beam and two substrate plates with the same rectangular permanent magnets as tip mass. If the rectangular tip mass is replaced with the same dimension and mass of the iron block, there is no repulsive force between the tip masses and this multiple-degree-of-freedom EMM piezoelectric vibration energy harvester system becomes linear.
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