Improving the galloping energy harvesting performance with magnetic coupling

Li, Haitao; Ren, He; Cheng, Fan; Qin, Weiyang

doi:10.1016/j.ijmecsci.2022.107785

Cited by 29 publications

(10 citation statements)

References 55 publications

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“…As the distance increases, the magnetic force decreases, and the growth of the restoring force of the piezoelectric beam stabilizes. When the magnetically attached GEHs move inside the first outer magnet, the function w(t) follows a cubic polynomial, which is consistent with the literature [38]. When the magnetically attached GEHs move outside the first outer magnet, the trend of F r (w(t)) in relation to w(t) is comparatively complex and can be well fitted by a fifth-degree or seventh-degree polynomial.…”

Section: Experiments Setup and Model Designsupporting

confidence: 88%

“…As shown in the figures 5(a) and (b), due to the segmentation of the piezoelectric beam's restoring force function, A-GEH exhibits a flatter potential well inside the magnet distance compared to A&R-GEH, whereas A&R-GEH displays a flatter potential curve outside the magnet distance compared to A-GEH. Studies indicate that a flatter and deeper potential well might be more favorable for energy harvesting [38].…”

Section: Experiments Setup and Model Designmentioning

confidence: 99%

“…The experimental data's phase diagram also forms a closed orbit, but the presence of frequency components at 2f and 3f, as seen in the frequency analysis figures 8(a)-(c) of the previous section, adds thickness to the limit cycle. This is due to the asymmetric action of the aero-dynamic force at large deflection, a force couple will be formed and act on the pillar bluff body, which may excite the second and third mode response [38]. Under the wind speed of 5.1 m s −1 , the limit cycle of the A&R-GEH is larger than that of the A-GEH, indicating that the combined effect of magnetic attraction and repulsion increases the energy harvesting capability of the GEH.…”

Section: Model Comparisonmentioning

confidence: 99%

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Design and analysis of a galloping-based piezoelectric energy harvester with coupled magnetism

Wang,

Tang,

Tan

2024

Smart Mater. Struct.

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Wind-induced vibration energy harvesters have attracted increasing attention due to their unique dynamic characteristics and excellent energy harvesting performance. In this study, two types of magnetic energy harvesters, namely the magnetic attraction energy harvester (A-GEH) and the coupled magnetic attraction and repulsion energy harvester (A&R-GEH), were designed and their electromechanical coupling analysis models were established. The results showed that the magnetically coupled energy harvesters can adjust the operating wind speed range and increase the energy harvesting capability by varying the placement of the magnetic poles and the magnetic moment. Furthermore, the established analysis model accurately predicted the results of the wind tunnel experiments. The output power of the energy harvesters was evaluated by illuminating LED bulbs, demonstrating the potential for self-powering small wireless sensors. Under an experimental wind speed of 5.1 m s−1 and a vertical distance Δy = 12 mm between the magnets, the A-GEH and A&R-GEH showed an increase in output power of 356.854% and 365.488%, respectively, compared to a general energy harvester without magnetism. In conclusion, this study provides a framework for the analysis and design of magnetic-coupled wind-induced vibration energy harvesters.

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Section: Experiments Setup and Model Designsupporting

confidence: 88%

Section: Experiments Setup and Model Designmentioning

confidence: 99%

Section: Model Comparisonmentioning

confidence: 99%

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Design and analysis of a galloping-based piezoelectric energy harvester with coupled magnetism

Wang,

Tang,

Tan

2024

Smart Mater. Struct.

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“…( 33) that the nonlinear coefficients k 1 and k 3 affect the response frequency of the system. From the previous researches [38,41], it is known that k 1 is negative and k 3 is positive. Thus, k 1 reduces the stiffness of the system and k 3 increases it.…”

Section: Power Performance Analysismentioning

confidence: 99%

Theoretical Analysis of the Power Performance of a Monostable Galloping-Based Piezoelectric Energy Harvester

Zhang,

Lan,

et al. 2024

International Journal of Energy Research

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In the past few years, different kinds of structural nonlinearities, such as external magnetic interaction and multistable structures, have been introduced into galloping energy harvesters to enhance energy harvesting efficiency. However, since the galloping-based piezoelectric energy harvester (GPEH) is a self-excited system, the conventional impedance matching method that is widely used in vibration energy harvesters is no longer valid for it. Therefore, the power characteristics of the nonlinear GPEH are still an open question to be solved. To this end, this paper is motivated to derive the approximate analytical solution of a monostable galloping-based piezoelectric energy harvester through the harmonic balance method and impedance matching theory. The analytical maximum power, power limit, and critical electromechanical coupling are studied from the perspective of the influence of structural nonlinearity on the power performance. Firstly, the approximate analytical solutions of output power, power limit, optimal resistance, and critical electromechanical coupling coefficient are derived. The accuracy of the analytical solution is verified by numerical simulation. It is found that the influence of structural nonlinearity on the power characteristics of the nonlinear GPEH is quite different under different wind speeds. After that, the power characteristics of the system under different wind speeds and different coupling conditions are investigated. The results showed that the maximum power of the system can be increased by introducing stiffness nonlinearity under low wind speed and weakly coupled configuration. Even more, the system can be shifted into a strongly coupled system when the nonlinearity is enhanced to a certain level. Reasonable design of stiffness nonlinearity can effectively reduce the critical electromechanical coupling, which indicates that stiffness nonlinearity is a feasible and effective way to improve the power performance of low-speed wind energy harvesting.

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“…Since the first vibration mode plays an overwhelming effect in the response of the cantilever beam with a tip mass, the only first mode can be considered in the modeling of a FIV energy harvester [39]. Substituting the single mode into the expressions of kinetic energy, potential energy and non-conservative work, and the governing equation can be obtained by using the following Euler-Lagrange equation d dt…”

Section: Design and Theoretical Modelingmentioning

confidence: 99%

Dynamics and performance evaluation of a vortex-induced vibration energy harvester with hybrid bluff body

Ren

Shang

et al. 2023

Smart Mater. Struct.

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To investigate the influence of bluff body with a variable section on the vortex-induced vibration energy harvesting performance, a series of hybrid cylinders are designed and a quantitative comparison is presented. The basic elements of hybrid bluff body are the D-shaped (D) and original circular-shaped cylinders (O), and the length ratio between the O-shaped part and the D-shaped part is fixed. According to the arrangement order, three kinds of hybrid bluff bodies are termed as ODO, ODODO and DOD. A distributed model is developed and the numerical simulation is carried out to verify the response. Corresponding wind tunnel experiments are conducted, and the results reveal that compared to the bluff body with a circular cylinder, the hybrid bluff bodies such as ODODO and DOD can enhance the vortex-induced vibration and thus increase the output significantly. Moreover, the lock-in regions with the ODODO and DOD shapes will increase by 12.5% and 62.5%, respectively. However, the results also indicate that some type of arrangement such as ODO will suppress the energy harvesting performance. Furthermore, the computational fluid dynamics (CFD) method is employed to reveal the physical mechanism of flow field around the hybrid bluff body. The results show that the integration of D-shape prism in a cylinder along an axial direction could influence aerodynamics. A faster boundary layer separation occurs for the VIV energy harvesters with the hybrid cylinders of ODODO and DOD, which could improve the energy conversion efficiency from flow-induced vibrations. However, the aerodynamic force is restricted and response is suppressed as a D-shaped cylinder is sandwiched between two O-shaped cylinders.

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Improving the galloping energy harvesting performance with magnetic coupling

Cited by 29 publications

References 55 publications

Design and analysis of a galloping-based piezoelectric energy harvester with coupled magnetism

Design and analysis of a galloping-based piezoelectric energy harvester with coupled magnetism

Theoretical Analysis of the Power Performance of a Monostable Galloping-Based Piezoelectric Energy Harvester

Dynamics and performance evaluation of a vortex-induced vibration energy harvester with hybrid bluff body

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