Dynamic Modeling and Structural Optimization of a Bistable Electromagnetic Vibration Energy Harvester

Zhang, Bei; Zhang, Qichang; Wang, Wei; Han, Jianxin; Tang, Xiaoli; Gu, Fengshou; Ball, Andrew

doi:10.3390/en12122410

Cited by 14 publications

(7 citation statements)

References 43 publications

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“…When the linear speed becomes lower at the ends of the stroke, the generator stops generating power. Therefore, the existing solutions have a low-power output [ 33 ]. A possible solution by which to improve energy harvesting efficiency in the case of low-speed electric machines with permanent magnets is decreasing the pole period [ 34 ].…”

Section: The Conceptmentioning

confidence: 99%

An Automotive Ferrofluidic Electromagnetic System for Energy Harvesting and Adaptive Damping

Lenkutis

Viržonis

Čerškus

et al. 2022

Sensors

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Vibration energy harvesting is receiving significant interest due to the possibility of using extra power in various machines and constructions. This paper presents an energy-harvesting system that has a structure similar to that of a linear generator but uses permanent magnets and magnetorheological fluid insets. The application of a standard vehicle example with low frequencies and amplitudes of the excitations was used for the optimization and experimental runs. The optimization for low excitation amplitudes shows that the best magnetic field change along the slider is obtained using differentially orientated radial magnets of 5 mm in width. This configuration was used for the experimental research, resulting in 1.2–3.28 W of power generated in the coils. The power conditioning system in the experimental research was replaced by loading resistors. Nevertheless, the initial idea of energy harvesting and a damping effect was confirmed by the circuit voltage output.

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Section: The Conceptmentioning

confidence: 99%

An Automotive Ferrofluidic Electromagnetic System for Energy Harvesting and Adaptive Damping

Lenkutis

Viržonis

Čerškus

et al. 2022

Sensors

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show abstract

“…Membrane’s response to steady vibration was obtained and it was concluded that the proposed model is capable of harvesting vibrational energy in a broader bandwidth at lower frequencies and how membrane thickness exhibit enhancement on the output power. 18 In Ostrowski et al, 19 a non-linear EMEH that encapsulates displacement amplifier and spring bumpers were presented. The purpose of using mechanical amplifier was to improve overall performance of EMEH for the same level of base excitation.…”

Section: Introductionmentioning

confidence: 99%

Design and characterization of non-linear electromagnetic energy harvester with enhanced energy output

Niazi,

Iqbal,

Saleem

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents design, analysis, and characterization of a compliant non-linear electromagnetic energy harvester operating on the principle of bi-stability incorporated with a displacement amplification mechanism. The energy harvester engenders energy from ambient vibrations at multiple modes and with frequencies ranging from 80 to 120 Hz. The energy harvester is analytically modeled using the mechanic’s elastic beam theory. Finite Element Analysis (FEA) has been carried out using commercial Finite Element Method (FEM) based software to perform static, fatigue, dynamic and electromagnetic analysis. Bi-stable mechanism has been used to harness energy at a wider frequency bandwidth while lever mechanism is acting as a displacement amplifier for enhancing low frequency vibration amplitude with the amplification factor of 6.24. With such amplification factor, the energy harvester can be deployed to extract vibrations of diminutive level and recast them into electrical energy in the form of generated voltage. Spring steel material, owing to its structural sensitivity, stiffness and higher value of ultimate stress, was used for its fabrication. The use of Neodymium (N52) magnets, copper coils and shaker were put into practice for testing of this device. The coil resistance is 2.5 Ω with number of turns kept at 350. The maximum output voltage of 1.86 V was generated at 106 Hz with root mean square value of 548 mV. Testing results are in accordance with the results obtained through simulations and thus useful electrical power of 11.1 mW can be generated from ambient vibrations at a wider bandwidth of 18 Hz with operating frequency ranging from 99 to 117 Hz.

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“…Anjum and He [32] used the variational iterative method combined with Laplace transform to find the approximate nonlinear frequency of a switch oscillatory system. Zhang et al [33] established the low-order vibration equation of the flexible thin-film electromagnetic actuator via nonlinear Galerkin method, and optimized the structural parameters to achieve a large output power. Herisanu et al [34] utilized the optimal auxiliary functions method (OAFM) to obtain exact and approximate analytical solutions of the model in an asymmetric electromagnetic actuator near the primary resonance.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and steady-state performance analysis of a linear solenoid parallel elastic actuator (LSPEA) with nonlinear stiffness

Wang

Luo

et al. 2022

Preprint

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In order to predict and evaluate the response time and displacement of a large-stroke, high-speed micro-LSPEA under different currents and springs, numerical and analytical methods are used to obtain the dynamic and steady-state performance indicators of the nonlinear system. Firstly, the analytic functions of the electromagnetic force and the magnetic field distribution were presented. The nonlinear vibration equation was obtained by dynamic modeling. The averaging method and the KBM method were employed to obtain analytical solutions of the undamped system. The equivalent linearization of the damped nonlinear system was performed to obtain the approximate analytical solutions of performance indicators. Finally, the displacement of the actuator equipped with different springs was measured experimentally. Meanwhile, the transient network was constructed by Simulink software to solve the nonlinear equation numerically. The displacement curves and performance indicators obtained by experiment, numerical and analytical methods are compared. The maximum errors of the peak time, overshoot and steady displacement through experiment and simulation are 8.4 ms, 4.36% and 0.59 mm, respectively. The solution result of the vibration equation considering stiffness nonlinearity can reflect the dynamic and steady-state performance of the LSPEA within a certain error, which is helpful for the solution of nonlinear systems caused by multi-physics coupling.

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Dynamic Modeling and Structural Optimization of a Bistable Electromagnetic Vibration Energy Harvester

Cited by 14 publications

References 43 publications

An Automotive Ferrofluidic Electromagnetic System for Energy Harvesting and Adaptive Damping

An Automotive Ferrofluidic Electromagnetic System for Energy Harvesting and Adaptive Damping

Design and characterization of non-linear electromagnetic energy harvester with enhanced energy output

Dynamic and steady-state performance analysis of a linear solenoid parallel elastic actuator (LSPEA) with nonlinear stiffness

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