Energy harvesting from pendulum oscillations

Marszal, Michał; Witkowski, B.; Jankowski, Krzysztof; Perlikowski, Przemysław; Kapitaniak, Tomasz

doi:10.1016/j.ijnonlinmec.2017.03.022

Cited by 73 publications

(33 citation statements)

References 25 publications

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“…One such option is to harvest energy from ambient vibrations. There have been several proposals on harvesting energy exploiting the various motions of a pendulum mounted on a vibrating structure [1][2][3][4][5][6]. In most of these studies, the interaction between the pendulum motion and the vibrating structure is ignored.…”

Section: Introductionmentioning

confidence: 99%

Energy extraction from vortex-induced vibrations using period-1 rotation of an autoparametric pendulum

Das

Wahi

2018

Proc. R. Soc. A.

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We propose and analyse the feasibility of extracting energy from vortex-induced vibrations using rotating motion of an attached pendulum. The resulting autoparametric pendulum system is studied primarily to understand the effect of pendulum motion on the performance of the harvester which is typically ignored to result in a simple parametric pendulum. We find that rotating motions are possible only for small values of the pendulum mass when compared with the effective mass of the vibrating structure. However, the pendulum motion reduces the basin of attraction as well as the range of system parameters corresponding to the existence of rotary solutions. This significantly alters the harvester performance. By contrast, the evolution of the pendulum coordinates (angular position and velocity) remains largely unaffected by this interaction. Hence, for the purpose of design of controllers to robustly initiate/maintain rotation from arbitrary disturbances, the simplification to a parametric pendulum is reasonable while for the design of the harvester, this exercise is completely unsatisfactory.

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Section: Introductionmentioning

confidence: 99%

Energy extraction from vortex-induced vibrations using period-1 rotation of an autoparametric pendulum

Das

Wahi

2018

Proc. R. Soc. A.

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“…The power that this EMF would deliver to the load can then be calculated using Eq. (10). The second test considers the closed-circuit case, where a load is attached, and the voltage across this load is measured and used to calculate the power.…”

Section: Methodsmentioning

confidence: 99%

Nonlinear model and optimization method for a single-axis linear-motion energy harvester for footstep excitation

Struwig

Wolhuter

Niesler

2018

Smart Mater. Struct.

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We propose and develop an electrical and mechanical system model of a singleaxis linear-motion kinetic energy harvester for impulsive excitation that allows its generated load power to be numerically optimised as a function of design parameters. The device consists of an assembly of one or more spaced magnets suspended by a magnetic spring and passing through one or more coils when motion is experienced along the axis. The design parameters that can be optimised include the number of coils, the coil height, coil spacing, the number of magnets, the magnet spacing and the physical size. We use the proposed model to design optimal energy harvesters for the case of impulse-like motion like that experienced when attached to the leg of a human. We generate several optimised designs, ranked in terms of their predicted load power output. The three best designs are subsequently constructed and subjected to controlled practical evaluation while attached to the leg of a human subject. The results show that the ranking of the measured output power corresponds to the ranking predicted by the optimisation, and that the numerical model correctly Predicts the relative differences in generated power for complex motion. It is also found that all three designs far outperform a baseline design. The best energy harvesters generated an average power of 3.01mW into a 40Ω test load when driven by footsteps whose measured peak impact was approximately 2.2g. With respect to the device dimensions, this corresponds to a power density of 179.380µW/cm 3 .

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“…The mechanical model of the energy harvester set with a rotational pendulum can be represented by the equation of motion [50][51][52]. Into the equation of motion (4) for a pendulum the equation of motion correcting factor was introduced in order to reflect real situation from the experiment.…”

Section: Mechanical Model Of the Mechanical Resonator And A Broadbandmentioning

confidence: 99%

Modelling of Electromagnetic Energy Harvester with Rotational Pendulum Using Mechanical Vibrations to Scavenge Electrical Energy

2020

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A concept of non-linear electromagnetic system with the rotational magnetic pendulum for energy harvesting from mechanical vibrations was presented. The system was stimulated by vertical excitation coming from a shaker. The main assumption of the system was the montage of additional regulated stationary magnets inside coils creating double potential well, and the system was made with a 3D printing technique in order to avoid a magnetic coupling with the housing. In validation process of the system, modelling of electromagnetic effects in different configurations of magnets positions was performed with the application of a finite element method (FEM) obtaining the value of magnetic force acting on the pendulum. A laboratory measurement circuit was built and an experiment was carried out. The voltage and power outputs were measured for different excitations in range of system operational frequencies found experimentally. The experimental results of the physical system with electrical circuit and numerical estimations of the magnetic field of a stationary magnet’s configuration were used to derive a mathematical model. The equation of motion for the rotational pendulum was used to prove the broadband frequency effect.

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Energy harvesting from pendulum oscillations

Cited by 73 publications

References 25 publications

Energy extraction from vortex-induced vibrations using period-1 rotation of an autoparametric pendulum

Energy extraction from vortex-induced vibrations using period-1 rotation of an autoparametric pendulum

Nonlinear model and optimization method for a single-axis linear-motion energy harvester for footstep excitation

Modelling of Electromagnetic Energy Harvester with Rotational Pendulum Using Mechanical Vibrations to Scavenge Electrical Energy

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