Dynamic performance of unimorph piezoelectric bending actuators

Nabawy, Mostafa R. A.; Parslew, Ben; Crowther, William

doi:10.1177/0959651814552810

Cited by 16 publications

(24 citation statements)

References 30 publications

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“…Bye et al [19], for instance, designed a morphing airplane that can significantly change the shape of its wings to adapt to different flight scenarios (e.g., cruising or high-speed dash), for which they employed thermopolymers and shape memory polymers (SMPs) besides piezo-actuators. Nabawy et al [21,22] developed a comprehensive analytical model to provide a mapping between force, displacement, charge and voltage for piezoelectric actuators. They also validated the model against experimental results.…”

Section: Electro-actuated Shape Adaptationmentioning

confidence: 99%

Non-Conventional Deformations: Materials and Actuation

Vermes

Czigány

2020

Materials

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This paper reviews materials and structures displaying non-conventional deformations as a response to different actuations (e.g., electricity, heat and mechanical loading). Due to the various kinds of actuation and targeted irregular deformation modes, the approaches in the literature show great diversity. Methods are systematized and tabulated based on the nature of actuation. Electrically and mechanically actuated shape changing concepts are discussed individually for their significance, while systems actuated by heat, pressure, light and chemicals are condensed in a shared section presenting examples and main research trends. Besides scientific research results, this paper features examples of real-world applicability of shape changing materials, highlighting their industrial value.The optimal shape-changing concept always depends on the application. In some cases, we do not want the material to adapt to its environment; instead, we wish to control its deformation actively. In these cases, systems actuated by electricity [5], heat [6] or pressure [7] may be considered. On the other hand, there are situations when environmental adaptation is what we are after to achieve maximum working efficiency of a structural part. In the case of marine or wind turbine blades, for instance, their shape for optimal energy yield depends on the direction and speed of the flowing fluid, i.e., the mechanical loading the blades are subjected to [8]. A mechanically actuated shape-changing material could passively modulate its shape (e.g., twisting) in response to changing loads (e.g., bending moments), resulting in significant efficiency gains.This review aims to introduce some selected shape-changing concepts from the literature categorized by the type of actuation giving an up-to-date overview of this field of research.

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Section: Electro-actuated Shape Adaptationmentioning

confidence: 99%

Non-Conventional Deformations: Materials and Actuation

Vermes

Czigány

2020

Materials

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“…Piezoelectric cantilever beams have always been attractive systems for analytical modelling (e.g., see [1,2,[25][26][27][29][30][31][32][33]). For harvesting applications, both lumped parameter and distributed parameter models have been considered.…”

Section: Model For An Equivalent Concentrated Tip Massmentioning

confidence: 99%

Solar Panels as Tip Masses in Low Frequency Vibration Harvesters

et al. 2019

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Tip masses are used in cantilevered piezoelectric energy harvesters to shift device resonance towards the required frequency for harvesting and to improve the electric power generation. Tip masses are typically in the form of concentrated passive weights. The aim of this study is to assess the inclusion of solar panels as active tip masses on the dynamics and power generation performance of cantilevered PVDF (polyvinylidene fluoride)-based vibration energy harvesters. Four different harvester geometries with and without solar panels are realized using off-the-shelf components. Our experimental results show that the flexible solar panels considered in this study are capable of reducing resonance frequency by up to 14% and increasing the PVDF power generated by up to 54%. Two analytical models are developed to investigate this concept; employing both an equivalent concentrated tip mass to represent the case of flexible solar panels and a distributed tip mass to represent rigid panels. Good prediction agreement with experimental results is achieved with an average error in peak power of less than 5% for the cases considered. The models are also used to identify optimum tip mass configurations. For the flexible solar panel model, it is found that the highest PVDF power output is produced when the length of solar panels is two thirds of the total length. On the other hand, results from the rigid solar panel model show that the optimum length of solar panels increases with the relative tip mass ratio, approaching an asymptotic value of half of the total length as the relative tip mass ratio increases significantly.

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“…Energy harvesting is the process by which ambient background energy (e.g., kinetic energy from wind/water flow or motion, solar radiation, structural vibration, temperature or salinity gradients, electromagnetic energy) is recovered to supply small-scale low-power (microwatt to milliwatt power range) electronic devices such as sensors, data-loggers, and data-transmitters for use in distributed sensing, equipment/process monitoring, smart city, and Internet of things applications [1][2][3][4][5][6]. Piezoelectric materials, in particular, were quite extensively investigated for harvesting energy from structural and flow-induced movement or vibration [7][8][9][10][11][12][13][14][15][16][17][18][19]. Piezoelectric harvesters typically comprise a structural element realized with a piezoelectric material (or bonded with a piezoelectric patch) that is either connected to a vibrating or moving structure, or exposed to fluid flow in such a way that flow-induced vibration or motion takes place.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Computational Study on Inverted Flag Dynamics for Simultaneous Wind–Solar Energy Harvesting

Cioncolini

Nabawy

Silva-Leon

et al. 2019

Fluids

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This paper presents results from experiments and simplified numerical simulations on the flow-induced dynamics and power generation of inverted flags that combine flexible piezoelectric strips with photovoltaic cells to simultaneously harvest kinetic wind energy and solar radiant energy. Experiments were conducted in a wind tunnel under controlled wind excitation and light exposure, focusing in particular on the dynamics and power generation of the inverted flag harvester. Numerical simulations were carried out using a lattice-Boltzmann fluid solver coupled with a finite element structural solver via the immersed-boundary method, focusing in particular on minimizing the simulation run time. The power generated during the tests shows that the proposed inverted flag harvester is a promising concept, capable of producing enough power (on the order of 1 mW) to supply low-power electronic devices in a range of applications where distributed power generation is needed. Notwithstanding key simplifications implemented in the numerical model to achieve a fast execution, simulations and measurements are in good agreement, confirming that the lattice-Boltzmann method is a viable and time-effective alternative to classic Navier–Stokes-based solvers when dealing with strongly coupled fluid–structure interaction problems characterized by large structural displacements.

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Dynamic performance of unimorph piezoelectric bending actuators

Cited by 16 publications

References 30 publications

Non-Conventional Deformations: Materials and Actuation

Non-Conventional Deformations: Materials and Actuation

Solar Panels as Tip Masses in Low Frequency Vibration Harvesters

An Experimental and Computational Study on Inverted Flag Dynamics for Simultaneous Wind–Solar Energy Harvesting

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