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

Giacomo Moretti; Gianluca Rizzello; Marco Fontana; Stefan Seelecke

doi:10.1117/12.2581718

22 March 2021 A multi-domain dynamical model for cone-shaped dielectric elastomer loudspeakers

Giacomo Moretti, Gianluca Rizzello, Marco Fontana, Stefan Seelecke

Proceedings Volume 11587, Electroactive Polymer Actuators and Devices (EAPAD) XXIII; 115871K (2021) https://doi.org/10.1117/12.2581718
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

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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Citation Download Citation

Giacomo Moretti, Gianluca Rizzello, Marco Fontana, and Stefan Seelecke "A multi-domain dynamical model for cone-shaped dielectric elastomer loudspeakers", Proc. SPIE 11587, Electroactive Polymer Actuators and Devices (EAPAD) XXIII, 115871K (22 March 2021); https://doi.org/10.1117/12.2581718

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