抄録
An acoustic material made of exploded bamboo fibers has been newly developed from the viewpoint of environmental protection. The basic acoustical properties such as the sound absorption coefficient of the material were measured. Compared with the acoustic material made of glass wool, it was confirmed that the acoustic material made of exploded bamboo fiber had the same sound absorbing effect. In order to design an optimal arrangement of the material, we tried to find out the best combination of the bulk density of the material. Second, we applied the designed arrangement of material to actual loudspeakers. The basic properties of loudspeakers such as the frequency characteristics and the cumulative decay spectrum were measured. The results show that the material clean more effectively standing wave which exists in loudspeaker than an actual product. Third sensory evaluations for loudspeakers were carried out based on Scheffe's method of paired comparison. From the results, the loudspeakers which were applied the acoustic material made of exploded bamboo fiber had more soft, deep, and delicate sound than an actual product. Consequently, fundamental design criteria have been confirmed for the sound absorption of newly developed bamboo fiber material under the restricted conditions.
