Modeling, Optimization, and Design of Efficient Initially Curved Piezoceramic                 Unimorphs for Energy Harvesting Applications

Yoon, Hwan‐Sik; Washington, Gregory; Danak, Amita D.

doi:10.1177/1045389x05055759

Cited by 73 publications

(51 citation statements)

References 18 publications

(28 reference statements)

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“…Simply supported curved piezoelectric unimorphs similar to that shown in figure 5 have been modelled in more detail by Yoon et al [47]. The basic rules of thumb identified by the modelling suggested that it is more effective to increase the width of the unimorph rather than the length and that the height at the centre and the thickness of the substrate material should be maximized within the capability of the manufacturing process and the available compressing force.…”

Section: Human Powered Piezoelectric Generationmentioning

confidence: 99%

Energy harvesting vibration sources for microsystems applications

Beeby

Tudor

White

2006

Meas. Sci. Technol.

2,609

1,468

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This paper reviews the state-of-the art in vibration energy harvesting for wireless, self-powered microsystems. Vibration-powered generators are typically, although not exclusively, inertial spring and mass systems. The characteristic equations for inertial-based generators are presented, along with the specific damping equations that relate to the three main transduction mechanisms employed to extract energy from the system. These transduction mechanisms are: piezoelectric, electromagnetic and electrostatic. Piezoelectric generators employ active materials that generate a charge when mechanically stressed. A comprehensive review of existing piezoelectric generators is presented, including impact coupled, resonant and human-based devices. Electromagnetic generators employ electromagnetic induction arising from the relative motion between a magnetic flux gradient and a conductor. Electromagnetic generators presented in the literature are reviewed including large scale discrete devices and wafer-scale integrated versions. Electrostatic generators utilize the relative movement between electrically isolated charged capacitor plates to generate energy. The work done against the electrostatic force between the plates provides the harvested energy. Electrostatic-based generators are reviewed under the classifications of in-plane overlap varying, in-plane gap closing and out-of-plane gap closing; the Coulomb force parametric generator and electret-based generators are also covered. The coupling factor of each transduction mechanism is discussed and all the devices presented in the literature are summarized in tables classified by transduction type; conclusions are drawn as to the suitability of the various techniques.

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Section: Human Powered Piezoelectric Generationmentioning

confidence: 99%

Energy harvesting vibration sources for microsystems applications

Beeby

Tudor

White

2006

Meas. Sci. Technol.

2,609

1,468

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“…A number of variations on this type of structure have been investigated. Several authors [54,62,63] have investigated the use of initially curved, or "pre-stressed" beams which have been demonstrated to give significantly higher output power than nonprestressed versions. A further development of this concept by Baker et al [57] involved the use of a curved beam between two pinned joints which could snap between concave and convex curves in response to excitation.…”

Section: Piezoelectric Conversionmentioning

confidence: 99%

“…Experimental results for this proposed method are not presented but it is apparent that ensuring efficient coupling between low and high frequency oscillators is critical to the efficiency of the overall structure. A fuller discussion of recent developments in piezo based devices is presented in [54].…”

Section: Piezoelectric Conversionmentioning

confidence: 99%

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Comparison of energy harvesting systems for wireless sensor networks

Gilbert

Balouchi

2008

Int. J. Autom. Comput.

280

132

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Wireless sensor networks (WSNs) offer an attractive solution to many environmental, security, and process monitoring problems. However, one barrier to their fuller adoption is the need to supply electrical power over extended periods of time without the need for dedicated wiring. Energy harvesting provides a potential solution to this problem in many applications. This paper reviews the characteristics and energy requirements of typical sensor network nodes, assesses a range of potential ambient energy sources, and outlines the characteristics of a wide range of energy conversion devices. It then proposes a method to compare these diverse sources and conversion mechanisms in terms of their normalised power density.

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“…By considering an electric field equal to 0 and due to the fact that the PVDF films are only metalized in the plane perpendicular to direction 3, the charge developed on the surface of the PVDF, Q can be expressed as the integral of electrical displacement over the effective surface area of the electrodes on the material [8]:…”

Section: Piezoelectricitymentioning

confidence: 99%

Design and Characterisation of A Wearable 33-Mode PVDF Energy Harvester

Cao

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. The conversion of biomechanical energy from human movement into useful electrical energy to power wearable electronics has become a topic of extensive study. This paper studies a model suitable to design and characterize 33-mode energy harvester based on piezoelectric polymers for wearable applications. The aim is to describe adequately the 33-mode energy harvester behavior, with a reasonable number of parameters and based on well-known physical equations. The connection mode is been considered and the corresponding open circuit total voltages are derived, which are verified by the experiments. Moreover, the experiments prove that all the three harvesters can be used to scavenging energy. IntroductionWeareable electronics are becoming smaller and increasingly widely used, resulting in an increasing research on the development of harvesting energy from human motion to provide renewable and clean energy [1][2][3]. According to previous research, it is identified as a feasible way to harvest energy from human foot which can produce great mechanical energy.There are many energy harvesters mounted in shoes based on different mechanisms, such as electromagnetic, electrostatic, thermoelectric, nano-triboelectric, piezoelectric harvesters. Specifically, piezoelectric energy harvester can convert mechanical energy into electric power directly, thus it owns a simpler structure and easier fabrication [1,4]. Hence, it can be especially suitable for wearable sensors.Kymissis, et al.[5]explored an insole which made of eight-layer stacks of PVDF sheets with a flexible plastic substrate, to harness the energy dissipated in bending of the sole and a PZT unimorph to tap the energy from heel strikes. Zhao et al. [1,6] proposed a sandwich structure PVDF energy harvester which is readily compatible with a shoe and works in the 31-mode and studied a series of models. Mateu et al. [7] did a study for different piezoelectric beam structures made of PVDF and found that triangular cantilever generates more energy than the rectangular shape.As discussed above, 31-mode energy harvester for wearable applications has been studied widely. The studies are rarely conducted in 33-mode harvester for it's difficult to implement in a real structure, but with the reduction of power consumption of wearable applications, the 33-mode can meet its needs. In this research, in order to study the 33-mode harvester for wearable applications, the insole is chosen as a good place for the 33-mode harvester to implant. A sandwich structure thin flat harvester is designed for it can be fitted without any sacrifice of comfort or radical alterations in design, which is readily compatible with a shoe. To obtain higher power, parallel and series configurations of the piezoelectric film are taken into consider, so two segmented electrode harvesters consisted of two equal area PVDF

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Modeling, Optimization, and Design of Efficient Initially Curved Piezoceramic Unimorphs for Energy Harvesting Applications

Cited by 73 publications

References 18 publications

Energy harvesting vibration sources for microsystems applications

Energy harvesting vibration sources for microsystems applications

Comparison of energy harvesting systems for wireless sensor networks

Design and Characterisation of A Wearable 33-Mode PVDF Energy Harvester

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