SOUND ABSORPTION STRUCTURE, SOUND ABSORPTION STRUCTURE GROUP, ACOUSTIC CHAMBER, METHOD OF ADJUSTING SOUND ABSORPTION STRUCTURE AND NOISE REDUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To efficiently absorb sound by widening a frequency band of absorbing sound in a plate/film vibration type sound absorption structure.;SOLUTION: In the sound absorption structure 1, a resistant member 40 is arranged in contact with a part (part in which vibrator 20 displaces) which is a peak or a valley of a natural mode of vibration of the vibrator 20. The sound vibration structure 1 consumes energy of sound waves due to vibration to absorb sound by vibrating the vibrator 20 due to a difference between sound pressure of the sound waves and the inside of an air layer 30 of the sound absorption structure 1 when the sound waves reach the vibrator 20 in the sound absorption structure 1. When the vibrator 20 deforms due to vibration, friction occurs between the resistant member 40 and the vibrator 20 (interface), the resistant member 40 deforms to generate internal friction in the inside of the resistant member 40, and energy of the sound waves by the frictions is consumed to absorb sound.;COPYRIGHT: (C)2009,JPO&INPIT