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No.6（2003）10.Sound absorption characteristics of the low frequency resonators that utilized recycled paper
Asako HIRAMA, Koichi KANDA, Hiroshi YOKOTA, Norichika HASEGAWA, Shoichi TAKADA and Kokichi KATO
It is difficult to find the proper measures to take if low frequency forms of resonance occur in a small area such as those found below a floor, a ceiling or so on. So we considered using Helmholtz resonators which can absorb specific types of frequency resonance. The Helmholtz resonators have a long and slender neck and a cave. It is considered that it consists of a mass of air in a neck, air spring of a cave and viscosity resistance of a neck area. Usually, resonators consist of stiff materials. But we made resonators using recycled papers and plywood which were inexpensive, light and not stiff, and we confirmed their sound absorption characteristics. Then we confirmed their usefulness of said performances through experiments, and we explained that we would be able to make resonators which have resonance frequencies around 100Hz.
Keywords
Helmholtz resonator, Recycled paper, Surface impedance, Impedance tube, Sound absorbing coefficient
