Energy harvesting with electromagnetic and piezoelectric seismic transducers: Unified theory and experimental validation

Bo, Loris Dal; Gardonio, Paolo

doi:10.1016/j.jsv.2018.06.034

Cited by 22 publications

(11 citation statements)

References 52 publications

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“…The peak is significantly smoothened by the Couette air damping effect. 39 An equally smoothened trough closely follows the peak. If the coil is instead short circuited, as shown by the dotted black lines, the resonance peak and the trough are further smoothened, up to a point where the amplitude of the spectrum monotonically rises with a shift between the two mass laws for the lower and higher frequencies asymptotes.…”

Section: Shunted Electromagnetic Tuned Vibration Absorbermentioning

confidence: 94%

“…As shown in Figure 1(b), this electro-mechanical transducer can be modelled with simple mechanical and electrical networks. 39 The mechanical network is formed by a base mass mb (for the inner magnetic element) and a seismic mass ma (for the outer ferromagnetic ring and double coil), which are connected via a spring ka (for the axial stiffness of the spiral springs) and damper ca (for the Couetter air damping that develops in the tiny air gap between the coil and magnet). Also, the electrical network is formed by a resistance Re and inductor Le connected in series (for the resistive and inductive effects produced by the coil).…”

Section: Shunted Electromagnetic Tuned Vibration Absorbermentioning

confidence: 99%

“…Also, the electrical network is formed by a resistance Re and inductor Le connected in series (for the resistive and inductive effects produced by the coil). Also, Dal Bo and Gardonio 39 showed that the inductor should be modelled with a complex inductance, which accounts for the non-linear lossy inductive effects produced by eddy currents. 40–42 Nevertheless, these effects were found to be negligible in the frequency range considered in this study and thus were not included in the model.…”

Section: Shunted Electromagnetic Tuned Vibration Absorbermentioning

confidence: 99%

“…40–42 Nevertheless, these effects were found to be negligible in the frequency range considered in this study and thus were not included in the model. Dal Bo and Gardonio 39 showed that eddy current damping 43–45 can be generated too, particularly when the outer ferromagnetic ring of the transducer is designed as a solid block. 40 This study assumes the transducer is properly designed to avoid the formation of eddy currents damping.…”

Section: Shunted Electromagnetic Tuned Vibration Absorbermentioning

confidence: 99%

“…The electromagnetic transduction is modelled with a two-port ideal transducer, which, as shown in Figure 1(b), is depicted as a current controlled force generator and a velocity controlled voltage generator. 39 The force fem and voltage eem produced by the two generators are thus given by the following constitutive equations where ie is the current flowing in the coil and truew˙a=truew˙s−truew˙b is the relative velocity between the outer ring and double coil assembly and the inner magnetic element. Also, ψ=Bl is the transduction coefficient, which is given by the product between the magnetic flux in the air gap and the length of the coil winding.…”

Section: Shunted Electromagnetic Tuned Vibration Absorbermentioning

confidence: 99%

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Tuning of a shunted electromagnetic vibration absorber based on the maximisation of the electrical power dissipated

Turco

Gardonio

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper investigates a local tuning approach for a shunted electromagnetic vibration absorber, which is based on the maximisation of the electrical power dissipated by the coil and shunt components. The study considers a simplified problem with a single-degree-of-freedom mechanical hosting system, which is excited by a white noise stochastic force. The hosting system is equipped with a coil-magnet seismic transducer, which is connected to a resistive-inductive shunt. The study examines the effectiveness of the shunted electromagnetic vibration absorber with respect to the following cost functions. Firstly, the reference cost function, which is based on the minimisation of the time-averaged kinetic energy of the hosting system. Secondly, the local cost functions, which are based on: the maximisation of the time-averaged vibration power absorbed by the shunted electromagnetic vibration absorber; the maximisation of the time-averaged mechanical power dissipated by the electromagnetic transducer and the maximisation of the time-averaged electrical power dissipated by the coil and the shunt. The study shows that, provided the transducer is lightly damped, the local cost function based on the maximisation of the electrical power dissipated by the coil and the shunt gives the same optimal tuning parameters than the reference cost function. Therefore, provided the electromagnetic transducer is properly designed, the shunt can be suitably tuned by maximising the time-averaged electrical power dissipated by the coil and shunt. This is a rather appealing practical solution since it can be implemented locally without the need of measuring the response of the hosting system and also it can be implemented in the shunt circuit without the need of extra sensors.

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Section: Shunted Electromagnetic Tuned Vibration Absorbermentioning

confidence: 94%