Analysis of magnetic plucking dynamics in a frequency up-converting piezoelectric energy harvester

Daukševičius, Rolanas; Kleiva, Arunas; Grigaliūnas, V.

doi:10.1088/1361-665x/aac8ad

Cited by 30 publications

(19 citation statements)

References 45 publications

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“…Moreover, the magnetometers registered magnetic field in the middle of the gap between the magnets, while magnetic forces that deflect the transducer, act directly on the driven magnet. Our previous study demonstrated that the measured tramp(Bx) and tramp(By) values are higher approximately by 10% with respect to the actual magnetic forces [16]. However, it is noted that these quantitative discrepancies do not have consequential effect on the results of this research work, particularly in terms of relationships between governing temporal parameters (ramping times, rise times, periods).…”

Section: Methodsmentioning

confidence: 68%

“…Digital oscilloscope PICO 6403 with software PicoScope 6 were used to capture and process signals of the magnetometers and the transducer, which was connected to the matched load resistor RML. All the measurements were made with P-VEH operating in the impulsive excitation regime, which means that the total transient response is largely dominated (energywise) by free vibrations characterized by a single (natural) frequency fn = 80 Hz (more than 90 % of electrical energy is generated during free vibrations under impulsive excitation conditions [16]). Therefore, value of matched load resistance may theoretically estimate as RML = 1/2fnCPT = =9.95 kΩ (CPTcapacitance of the transducer).…”

Section: Methodsmentioning

confidence: 99%

“…For a given transducer, the dynamics of the magnetic plucking process and the generated electrical outputs are primarily governed by the motion speed of driving magnet (plucking speed) vexc. The highest output is generated when vexc is sufficiently high to induce true impulsive excitation that leads to transient resonance, which is characterized by the highest amplitudes of the induced dynamic and electric transient responses [16]. In the investigated multi-magnet plucking case, the distance between the driving magnets dm = 20 mm (Fig.…”

Section: Structure and Operation Of Magnetically Plucked Piezoelectrimentioning

confidence: 99%

“…Specifically, multi-magnet plucking regime may provide enhanced energy harvesting performance only when P-VEH is impulsively excited to engage in transient resonance. It implies that each consecutive excitation impulse must ensure that the ramping time of the dominant deflecting force is comparable to the transducer rise time trise [16]. The largest gain in electrical outputs during the multi-magnet plucking regime is obtained when the ramping times are slightly smaller than the transducer rise time, i.e.…”

Section: Experimental Analysismentioning

confidence: 99%

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Experimental study of multi-magnet excitation for enhancing micro-power generation in piezoelectric vibration energy harvester

Kleiva

Daukševičius

2019

mech

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The reported work experimentally investigates a method of more effective contactless mechanical frequency up-conversion that is based on multi-magnet plucking of a piezoelectric vibration energy harvester. Several moving excitation magnets are used to produce a periodic impulse train, which during a single plucking event consecutively deflects and then releases the cantilevered transducer to freely oscillate, thereby enabling enhanced micro-power generation performance. It was established that the proposed method is effective if a couple conditions are met. First, the transducer must be impulsively excited to produce resonant transient responses, which occurs when the ramping time of the magnetic impulse is close to the transducer rise time (defined as a quarter of the natural period). Second, the gap between the moving excitation magnets must be tuned to ensure that the impulse train period is as close to the natural period as possible. Measurements indicate that, in comparison to the conventional single-magnet plucking case, the consecutive excitation with three moving magnets leads to nearly six-fold (seven-fold) increase in average power output and total generated energy during the in-plane (out-of-plane) plucking regime.

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Section: Methodsmentioning

confidence: 68%

Section: Methodsmentioning

confidence: 99%

Section: Structure and Operation Of Magnetically Plucked Piezoelectrimentioning

confidence: 99%

Section: Experimental Analysismentioning

confidence: 99%

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Experimental study of multi-magnet excitation for enhancing micro-power generation in piezoelectric vibration energy harvester

Kleiva

Daukševičius

2019

mech

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“…The magnetic force can be used as an intermediate driving force to drive the vibration of the piezoelectric beams, which convert the vibration energy into electrical energy [ 177 , 178 , 179 , 180 , 181 , 182 , 183 , 184 , 185 , 186 , 187 , 188 , 189 ]. It is better to harvest the energy of rotational motion.…”

Section: Magnetic Plucking Energy Harvestersmentioning

confidence: 99%

A Review of Piezoelectric Vibration Energy Harvesting with Magnetic Coupling Based on Different Structural Characteristics

Jiang

Liu

Feng³

et al. 2021

Micromachines

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Piezoelectric vibration energy harvesting technologies have attracted a lot of attention in recent decades, and the harvesters have been applied successfully in various fields, such as buildings, biomechanical and human motions. One important challenge is that the narrow frequency bandwidth of linear energy harvesting is inadequate to adapt the ambient vibrations, which are often random and broadband. Therefore, researchers have concentrated on developing efficient energy harvesters to realize broadband energy harvesting and improve energy-harvesting efficiency. Particularly, among these approaches, different types of energy harvesters adopting magnetic force have been designed with nonlinear characteristics for effective energy harvesting. This paper aims to review the main piezoelectric vibration energy harvesting technologies with magnetic coupling, and determine the potential benefits of magnetic force on energy-harvesting techniques. They are classified into five categories according to their different structural characteristics: monostable, bistable, multistable, magnetic plucking, and hybrid piezoelectric–electromagnetic energy harvesters. The operating principles and representative designs of each type are provided. Finally, a summary of practical applications is also shown. This review contributes to the widespread understanding of the role of magnetic force on piezoelectric vibration energy harvesting. It also provides a meaningful perspective on designing piezoelectric harvesters for improving energy-harvesting efficiency.

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Review of frequency up‐conversion vibration energy harvesters using impact and plucking mechanism

Ahmad

Khan

2021

Int J Energy Res

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One of the main challenges in the field of vibration energy harvesting is to extract energy from the low-frequency ambient vibrations. Since the voltage and power production in vibration energy harvesters depends on the relative velocity (frequency), therefore, comparatively high power levels are produced at a high frequency of vibrations. For low-frequency excitation of the base, technique such as frequency up-conversion (FUC) is widely utilised. In FUC method, a very low-frequency vibration is efficiently harvested using the plucking mechanism. FUC harvesters are comprised of a low-frequency mechanism (primary system) and a high-frequency mechanism (secondary system), which are either coupled operationally through freely moving mass, mechanical plucking, magnetic plucking or mechanical impact. The mechanical contact plucking or magnetic plucking mechanism is used for exciting a secondary system that has a much higher frequency for efficiently harvesting more energy. This work provides a detailed review of the FUC energy harvesters that are utilising freely moving mass, plucking mechanism and mechanical impact techniques reported in the literature. Information about the harvesters' architecture, working, fabrication and output performance is performed with an emphasis on input low frequency, input acceleration, converted high frequency, voltage generation, power levels and power density values reported in the literature. Moreover, all techniques developed for low-frequency vibration applications are compared and the effectiveness of each mechanism used for low-frequency energy harvesting is discussed.

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Analysis of magnetic plucking dynamics in a frequency up-converting piezoelectric energy harvester

Cited by 30 publications

References 45 publications

Experimental study of multi-magnet excitation for enhancing micro-power generation in piezoelectric vibration energy harvester

Experimental study of multi-magnet excitation for enhancing micro-power generation in piezoelectric vibration energy harvester

A Review of Piezoelectric Vibration Energy Harvesting with Magnetic Coupling Based on Different Structural Characteristics

Review of frequency up‐conversion vibration energy harvesters using impact and plucking mechanism

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