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- W2906808678 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." @default.
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- W2906808678 date "2019-05-01" @default.
- W2906808678 modified "2023-10-18" @default.
- W2906808678 title "Balloon dielectric elastomer actuator speaker" @default.
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- W2906808678 doi "https://doi.org/10.1016/j.apacoust.2018.12.032" @default.
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