大容量コンデンサを用いた電磁力インパルス音源の開発

抄録

The electromagnetic-force-powered impulsive sound source using large volumes of capacitors was developed. This source is composed of capacitors (44000μF), a coil and an aluminum vibration board (0.5 m x 0.5 m). Large magnetic power between the coil and the aluminum board is generated by discharging an electrical current from capacitors in a moment. This power moves the aluminum board in moment, and then, an impulsive sound is generated. This source could generate impulsive sounds with sound pressure over 60 Pa (= 130 dB) at a distance of 1 m from the source. The time width of generated sound was about 3 ms and the frequency range was from 5 to 500 Hz. This paper reports the overview of this device.