Hosoya Naoki, Baba Shun, Maeda Shingo
Department of Engineering Science and Mechanics, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan
Division of Mechanical Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan
J Acoust Soc Am. 2015 Oct;138(4):EL424-8. doi: 10.1121/1.4934550.
Although indoor acoustic characteristics should ideally be assessed by measuring the reverberation time using a point sound source, a regular polyhedron loudspeaker, which has multiple loudspeakers on a chassis, is typically used. However, such a configuration is not a point sound source if the size of the loudspeaker is large relative to the target sound field. This study investigates a small lightweight loudspeaker using a dielectric elastomer actuator vibrating in the breathing mode (the pulsating mode such as the expansion and contraction of a balloon). Acoustic testing with regard to repeatability, sound pressure, vibration mode profiles, and acoustic radiation patterns indicate that dielectric elastomer loudspeakers may be feasible.
虽然理想情况下室内声学特性应由使用点声源测量混响时间来评估，但通常使用的是一种规则多面体扬声器，其在底盘上有多个扬声器。然而，如果扬声器的尺寸相对于目标声场较大，这种配置就不是点声源。本研究调查了一种使用以呼吸模式（如气球膨胀和收缩的脉动模式）振动的介电弹性体致动器的小型轻质扬声器。关于重复性、声压、振动模式轮廓和声学辐射模式的声学测试表明，介电弹性体扬声器可能是可行的。
