Dynamics and sound radiation of a dielectric elastomer membrane

Garnell, Emil; Rouby, Corinne; Doaré, Olivier

doi:10.1016/j.jsv.2019.07.002

Cited by 22 publications

(23 citation statements)

References 26 publications

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“…Due to non‐negligible electrode resistivity, the electric field on some portions of the DE material (far from the connections with the power electronics) might result in being lower than the target static value, limiting the DE material capability to uniformly achieve large convertible energy densities. [ 63 ] Indicating with R s the sheet resistance of the compliant electrodes, the characteristic R – C time constant of the electrodes‐DE assembly is

τ_{normale} = R_{normals} C_{DEG}

. In contrast with τ d , time constant

τ_{normale}

depends on both the DEG system dimensions and the materials properties, and it is required to be as small as possible.…”

Section: Generalities On Degsmentioning

confidence: 99%

A Review of Dielectric Elastomer Generator Systems

Moretti

Rosset

Vertechy

et al. 2020

Advanced Intelligent Systems

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Dielectric elastomer generator systems (DEGSs) are a class of electrostatic softtransducers capable of converting oscillating mechanical power from different sources into usable electricity. Over the past years, a diversity of DEGSs has been conceived, integrated, and tested featuring diverse topologies and implementation characteristics tailored on different applications. Herein, the recent advances on DEGSs are reviewed and illustrated in terms of design of hardware architectures, power electronics, and control, with reference to the different application targets, including large-scale systems such as ocean wave energy converters, and small-scale systems such as human motion or ambient vibration energy harvesters. Finally, challenges and perspectives for the advancement of DEGSs are identified and discussed.

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τ_{normale} = R_{normals} C_{DEG}

. In contrast with τ d , time constant

τ_{normale}

depends on both the DEG system dimensions and the materials properties, and it is required to be as small as possible.…”

Section: Generalities On Degsmentioning

confidence: 99%

A Review of Dielectric Elastomer Generator Systems

Moretti

Rosset

Vertechy

et al. 2020

Advanced Intelligent Systems

View full text Add to dashboard Cite

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“…For the aim of sound reproduction (e.g., playing an audio file), choosing a time-dependent component of the voltage proportional to the desired output pressure will at least result in harmonic distortions due to the quadratic form of the voltage. For this reasons, different strategies have been proposed to suitably pre-process the voltage input as function of the desired acoustic output, 5,8,9 as further discussed in Sect. 4.…”

Section: Electro-elastic Model Of the Diaphragm Dynamicsmentioning

confidence: 99%

“…The pressure field generated by the speaker is calculated from the local velocities of the DE diaphragm elements through a discretisation of the Rayleigh integral, which approximates the diaphragm surface as a distribution of acoustic monopoles. 9 In the following, we use a time-domain formulation for the Rayleigh integral, which accounts for the DE membrane curvature. 9,17 We consider a cone-DEA mounted on an infinite baffle and a receptor point on the device axis at a distance h r from the axis.…”

Section: Radiated Acoustic Pressure Modelmentioning

confidence: 99%

“…Most of these concepts rely on a circular DE membrane topology, on which a bubble-like initial deformation is impressed through a pressurisation/depressurisation. [4][5][6][7][8][9] Other layouts include flat-electrode, 10 buckling membrane, 11 and cone-shaped DEA speakers. 12 In spite of these experimental proofs-of-concept, modelling and numerical analysis of DE speakers have been scarcely investigated.…”

Section: Introductionmentioning

confidence: 99%

“…12 In spite of these experimental proofs-of-concept, modelling and numerical analysis of DE speakers have been scarcely investigated. Recently, Garnell et al 9,13 investigated for the first time the complex electro-elastoacoustic interactions occurring in pneumatically-biased DE speakers. With the aim of weighting the effect of coupled elasto-acoustic interactions, they used a linear modelling approach, which proved very effective in predicting the DE loudspeaker frequency response, still without considering the effect of DEAs' nonlinear dynamics on the harmonic distortions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A multi-domain dynamical model for cone-shaped dielectric elastomer loudspeakers

Moretti

Rizzello

Fontana

et al. 2021

Electroactive Polymer Actuators and Devices (EAPAD) XXIII

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This paper presents a multi-physics model of an electrostatic loudspeaker system that combines the acoustic diaphragm and the actuator into a lightweight dielectric elastomer (DE) membrane. The focus is set on the so-called cone-shaped DE actuator (DEA) topology, which features a self-standing compact architecture, free from pneumatic loading systems, and is potentially suitable for integration onto complex surfaces and structures. We propose an axial-symmetrical lumped-parameter nonlinear model of the cone DEA structural dynamics, and use it to predict the acoustic pressure field generated by the speaker. We then present a case study in which the model is used to predict the linearised mode shapes of a reference DEA, evaluate their effect on the acoustic frequency response, and compare the harmonic distortions resulting from different driving strategies.

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