Effective piezoelectric energy harvesting with bandwidth enhancement by assymetry augmented self-tuning of conjoined cantilevers

Staaf, L G H; Smith, Anderson David; Lundgren, Per; Folkow, Peter D.; Enoksson, Peter

doi:10.1016/j.ijmecsci.2018.09.050

Cited by 38 publications

(18 citation statements)

References 25 publications

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“…Staaf et al presented a self-tuning energy harvester exploiting a sliding mass on a middle beam acting to conjoin two piezoelectric cantilevers. [61][62][63] From the schematic design in Figure 11a, the harvester consists of three cantilever beams conjointed via metal couplings. The top and bottom cantilevers with piezoelectric parts to generate power are fixed at one end and connected to the middle beam by the metal couplings at the other free end.…”

Section: Mechanical Srt In Vibration Motionmentioning

confidence: 99%

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Piezoelectric Energy Harvesting Design Principles for Materials and Structures: Material Figure‐of‐Merit and Self‐Resonance Tuning

Song

Kim

et al. 2020

Advanced Materials

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Piezoelectric energy harvesters (PEHs) aim to generate sufficient power to operate targeting device from the limited ambient energy. PEH includes mechanical-to-mechanical, mechanical-to-electrical, and electrical-to-electrical energy conversions, which are related to PEH structures, materials, and circuits, respectively; these should be efficient for increasing the total power. This critical review focuses on PEH structures and materials associated with the two major energy conversions to improve PEH performance. First, the resonance tuning mechanisms for PEH structures maintaining continuous resonance, regardless of a change in the vibration frequency, are presented. Based on the manual tuning technique, the electrically-and mechanicallydriven self-resonance tuning (SRT) techniques are introduced in detail. The representative SRT harvesters are summarized in terms of tunability, power consumption, and net power. Second, the figure-of-merits of the piezoelectric materials for output power are summarized based on the operating conditions, and optimal piezoelectric materials are suggested. Piezoelectric materials with large k ij , d ij , and g ij values are suitable for most PEHs, whereas those with large k ij and Q m values should be used for on-resonance conditions, wherein the mechanical energy is directly supplied to the piezoelectric material. This comprehensive review provides insights for designing efficient structures and selection of proper piezoelectric materials for PEHs.

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Section: Mechanical Srt In Vibration Motionmentioning

confidence: 99%

Section: Mechanical Srt In Vibration Motionmentioning

confidence: 99%

Piezoelectric Energy Harvesting Design Principles for Materials and Structures: Material Figure‐of‐Merit and Self‐Resonance Tuning

Song

Kim

et al. 2020

Advanced Materials

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“…In the case of broadband techniques, this problem is solved by applying an additional mechanical stopper introducing nonlinearities [7,[11][12][13][14][15] or considering a magnetic field induced between a stationary magnet and a magnet attached to the harvester beam [8,[16][17][18][19]. In [11], experimental investigations of the beam-slider structure were performed.…”

Section: Introductionmentioning

confidence: 99%

The influence of a slider gap in the beam–slider structure with an MFC element on energy harvesting from the system: experimental case

Koszewnik

2020

Acta Mech

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A passively self-tuning resonator configuration is presented in this study. Under certain operating conditions, a self-resonating system has the capability to passively adjust dynamical characteristics until the whole system becomes resonant. A clamped–clamped beam with an attached mass sliding along the beam and a slight gap that, under a harmonic input excitation and well-defined operating regime, can lead to the increase in voltage amplitude generated by the piezo-harvester attached to this structure may be an example of such a system. Taking into account such behavior of the system, the paper is focused on determining the distributed-parameters of the electromechanical system versus a different slider position on the beam in modal coordinates. The obtained simulation results, considering the homogenous model of an MFC element for the desired slider locations, showed how the width of the gap between the slider and the beam additionally influences the voltage generated by the piezo-harvester. Experimental tests carried out on the real stand with an EHE301 module and the designed SSHI interface circuit allowed to verify the numerical results and also showed the influence on the resistive load connected to the system for an improvement of the considered energy harvesting system parameters.

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“…However, large softening behavior would prevent the pull-in instability, increase the level of the harvested power, and broaden the bandwidth. These observations give a deeper insight into the behavior of such energy harvesters and are of great importance to the designers of electrostatic energy harvesters.Energies 2019, 12, 4249 2 of 26 new technologies, it becomes viable to harvest power from ambient and aeroelastic vibrations [2-6], thermal energy [7,8], airflow [9][10][11][12], and ocean waves [13].Common energy-harvesting techniques employ piezoelectric [14][15][16][17][18], electromagnetic [19][20][21][22][23], electrostatic [24][25][26][27], and hybrid [28] conversion principles according to the type of application [29]. Electrostatic mechanism has advantages over other mechanisms where it is possible to work at low frequency and wide bandwidth [30].…”

mentioning

confidence: 99%

“…Common energy-harvesting techniques employ piezoelectric [14][15][16][17][18], electromagnetic [19][20][21][22][23], electrostatic [24][25][26][27], and hybrid [28] conversion principles according to the type of application [29]. Electrostatic mechanism has advantages over other mechanisms where it is possible to work at low frequency and wide bandwidth [30].…”

mentioning

confidence: 99%

Nonlinear Analysis and Performance of Electret-Based Microcantilever Energy Harvesters

Hammad

Abdelmoula²,

Abdel‐Rahman

et al. 2019

Energies

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An energy harvester composed of a microcantilever beam with a tip mass and a fixed electrode covered with an electret layer is investigated when subject to an external harmonic base excitation. The tip mass and fixed electrode form a variable capacitor connected to a load resistance. A single-degree-of-freedom model, derived based on Newton’s and Kirshoff’s laws, shows that the tip mass displacement and charge in the variable capacitor are nonlinearly coupled. Analysis of the eigenvalue problem indicates the influence of the electret surface voltage and electrical load resistance on the harvester linear characteristics, namely the harvester coupled frequency and electromechanical damping. Then, the frequency–response curves are obtained numerically for a range of load resistance, electret voltage and base excitation amplitudes. A softening nonlinear effect is observed as a result of decreasing the load resistance and increasing the electret voltage. It is found that there is an optimal electret voltage with the highest harvested electrical power. Below this optimal value, the bandwidth is very small, whereas the bandwidth is large when the electret voltage is above this optimal value. In addition, it is noted that for a certain excitation frequency, the harvested power decreases or increases as a function of electrical load resistance when the coupled frequency is closer to short- or open-circuit frequency, respectively. However, when the coupled frequency is between the short-circuit and open-circuit frequencies, the harvested power has an optimal resistance with the highest power. Increasing the excitation amplitude to raise the harvested power could be accompanied with dynamic pull-in instability and/or softening behavior depending on the electrical load resistance and electret voltage. However, large softening behavior would prevent the pull-in instability, increase the level of the harvested power, and broaden the bandwidth. These observations give a deeper insight into the behavior of such energy harvesters and are of great importance to the designers of electrostatic energy harvesters.

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Effective piezoelectric energy harvesting with bandwidth enhancement by assymetry augmented self-tuning of conjoined cantilevers

Cited by 38 publications

References 25 publications

Piezoelectric Energy Harvesting Design Principles for Materials and Structures: Material Figure‐of‐Merit and Self‐Resonance Tuning

Piezoelectric Energy Harvesting Design Principles for Materials and Structures: Material Figure‐of‐Merit and Self‐Resonance Tuning

The influence of a slider gap in the beam–slider structure with an MFC element on energy harvesting from the system: experimental case

Nonlinear Analysis and Performance of Electret-Based Microcantilever Energy Harvesters

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