| 摘要 |
PROBLEM TO BE SOLVED: To efficiently absorb a sound by widening a frequency band with a high sound absorption coefficient, in a plate and/or film vibration-type sound absorption structure. SOLUTION: A bottom portion 11 is fixed to one opening of a sidewall 12, and a first vibrator 20-1 is fixed to the other opening thereof. Additionally, inside the sidewall 12 and in a position away by a predetermined distance from the bottom portion 11 to the side of the first vibrator 20-1, a second vibrator 20-2 is fixed to the sidewall 12 in parallel with the bottom portion 11. Thus, sound absorption mechanisms of a plurality of mass-spring systems different in frequency with a peak sound absorption coefficient are formed of a mass component of the first vibrator 20-1, that of the second vibrator 20-2, a spring component of a first air space 30-1, and that of a second air space 30-2, so that sound absorption is performed in a wide frequency band. COPYRIGHT: (C)2010,JPO&INPIT |
