Balloon dielectric elastomer actuator speaker

Naoki Hosoya; Hiroaki Masuda; Shingo Maeda

doi:10.1016/j.apacoust.2018.12.032

Balloon dielectric elastomer actuator speaker

Naoki Hosoya, Hiroaki Masuda, Shingo Maeda

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

A balloon dielectric elastomer actuator (DEA) speaker is constructed by forming a disk-shaped DEA film into a sphere using air, increasing its surface area by 3033%. Sound is generated via expansion and contraction. Shaping the DEA film into a sphere decreases the film thickness and applies a significant amount of pre-strain (prestretch) to the film. In the experiment, sound pressure levels in an audible frequency response up to 16 kHz is the approximately same as both our previous hemispherical DEA speaker and this balloon DEA speaker, allowing an actuating voltage of the balloon speaker lower (800 V p-p signal with an offset of 400 V) than that of our previous hemispherical DEA speaker (2 kV). This is the first time to achieve the audible frequency response of the acrylic balloon DEA speaker. Furthermore, the acoustic radiation pattern of the speaker extends over a 270° range. Compared to polyhedron loudspeakers, which are currently used as omnidirectional sound sources in general acoustic tests, a balloon DEA speaker is compact and lightweight. Therefore, balloon DEA speakers have sufficient potential to contribute to the proper assessment of indoor acoustic characteristics using a scale model.

Original language	English
Pages (from-to)	238-245
Number of pages	8
Journal	Applied Acoustics
Volume	148
DOIs	https://doi.org/10.1016/j.apacoust.2018.12.032
Publication status	Published - 2019 May

Keywords

Audible frequency response
Balloon
Dielectric elastomer actuator
Speaker
Spherical shape

ASJC Scopus subject areas

Acoustics and Ultrasonics

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10.1016/j.apacoust.2018.12.032

Cite this

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title = "Balloon dielectric elastomer actuator speaker",

abstract = "A balloon dielectric elastomer actuator (DEA) speaker is constructed by forming a disk-shaped DEA film into a sphere using air, increasing its surface area by 3033%. Sound is generated via expansion and contraction. Shaping the DEA film into a sphere decreases the film thickness and applies a significant amount of pre-strain (prestretch) to the film. In the experiment, sound pressure levels in an audible frequency response up to 16 kHz is the approximately same as both our previous hemispherical DEA speaker and this balloon DEA speaker, allowing an actuating voltage of the balloon speaker lower (800 V p-p signal with an offset of 400 V) than that of our previous hemispherical DEA speaker (2 kV). This is the first time to achieve the audible frequency response of the acrylic balloon DEA speaker. Furthermore, the acoustic radiation pattern of the speaker extends over a 270° range. Compared to polyhedron loudspeakers, which are currently used as omnidirectional sound sources in general acoustic tests, a balloon DEA speaker is compact and lightweight. Therefore, balloon DEA speakers have sufficient potential to contribute to the proper assessment of indoor acoustic characteristics using a scale model.",

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author = "Naoki Hosoya and Hiroaki Masuda and Shingo Maeda",

note = "Funding Information: We thank the Japan Society for the Promotion of Science for their support under Grants-in-Aid for Scientific Research programs (Grants-in-Aid for Scientific Research (B), Project No. JP16H04291, and No. JP16H04306, and Grants-in-Aid for Challenging Exploratory Research, Project No. JP17K18858, and No. JP16K14201). Publisher Copyright: {\textcopyright} 2018 The Authors Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",

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doi = "10.1016/j.apacoust.2018.12.032",

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AB - A balloon dielectric elastomer actuator (DEA) speaker is constructed by forming a disk-shaped DEA film into a sphere using air, increasing its surface area by 3033%. Sound is generated via expansion and contraction. Shaping the DEA film into a sphere decreases the film thickness and applies a significant amount of pre-strain (prestretch) to the film. In the experiment, sound pressure levels in an audible frequency response up to 16 kHz is the approximately same as both our previous hemispherical DEA speaker and this balloon DEA speaker, allowing an actuating voltage of the balloon speaker lower (800 V p-p signal with an offset of 400 V) than that of our previous hemispherical DEA speaker (2 kV). This is the first time to achieve the audible frequency response of the acrylic balloon DEA speaker. Furthermore, the acoustic radiation pattern of the speaker extends over a 270° range. Compared to polyhedron loudspeakers, which are currently used as omnidirectional sound sources in general acoustic tests, a balloon DEA speaker is compact and lightweight. Therefore, balloon DEA speakers have sufficient potential to contribute to the proper assessment of indoor acoustic characteristics using a scale model.

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Balloon dielectric elastomer actuator speaker

Abstract

Keywords

ASJC Scopus subject areas

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