Abstract
In this paper, we investigate the response of asymmetric potential monostable energy harvesters (MEHs) excited by color noise and band-limited noise. The motivation for this study is that environmental vibrations always have the characteristic of randomness, and it is difficult to modulate a perfectly symmetric MEH. For the excitation of exponentially correlated color noise, the moment differential equation was applied to evaluate the output performance of the asymmetric potential MEHs. Numerical and theoretical analyses were carried out to investigate the influence of noise intensity and internal system parameters on the output power of the system. Our results demonstrate that the output performance of the asymmetric MEH decreases with the increase in the correlation time, which determines the character of the color noise. On the contrary, the increase in the asymmetric degree enhances the output power of the asymmetric MEH subjected to color noise. For the band-limited noise excitation, numerical simulation is undertaken to consider the response of the asymmetric MEHs, and outcomes indicate that the frequency bandwidth and center frequency have a significant influence on the output performance. Regarding the asymmetric potential, its appearance leads the MEHs to generate higher output power at lower frequencies and this phenomenon is more obvious with the increase in the degree of asymmetry. Finally, we observed that the characteristics of the response bandwidth of asymmetric MEHs subjected to band-limited noise excitation are similar to the response under harmonic excitation.
Highlights
Asymmetric (MEH) and numerical investigations of the influence of asymmetric potentials on monostable energy harvesters (MEHs) subjected to Figure 1 depicts the schematic plot of the piezoelectric monostable energy h color noise are presented in Section 3 and the response of asymmetric MEH under band(MEH)
By adjusting the magnet polarity and parameters d, h, and θ, a monostable energy harvesting system could be achieve experiments, an MEH with a perfectly symmetric potential energy function is dif Figure 1 depicts the schematic plot of the piezoelectric monostable energy harvester even impossible obtain due the two asymmetry
Under band-limited noise excitation, the property of multiple solutions of MEHs cannot be achieved, and the response frequency is mainly distributed in lower frequencies
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Linear energy harvesters only perform well near their resonance frequencies, and a slight change in the excitation frequency will decrease their performance To address these problems, a large number of studies have focused on broadening the frequency band of response by applying the mechanical and magnetic coupling approaches [4]. Approximately determined the output performance of a nonlinear piezoelectric energy harvester excited by Gaussian white noise excitations by an equivalent linearization method and numerical simulation demonstrated the effectiveness of the results. This paper focuses on the influence of asymmetric potential ener tions on the response of monostable energy harvesters (MEHs) subjected to col and band-limited noise. The influence of system parameters on merical investigations of the influence of asymmetric potentials on MEHthe subjected output performance of the asymmetric MEHs was studied and numerical results agree noise are presented in Section 3 and the response of asymmetric MEH under band well with the theoretical outcomes.
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