Eco-awareness is growing up in these years around the world, and the perforated bamboo composite panel is a kind of the building materials that green. Because it is beautiful and natural, firm but portable, the prospect of the perforated bamboo composite panel is potentially. This study discusses all factors that can affect the sound absorption characteristics of perforated bamboo composite panel, including the perforation, backing materials, and air space. Besides, in order to upgrading the sense of beauty, and discusses the cover rate of faceplate which on the perforated panel, too.
Afterward this study will try to figure out a suitable prediction formula for resonant frequencies of perforated bamboo composite panel to make the designer surveyed the resonant frequencies quickly and simply. There are some conclusions as follow:
1.In the same perforation, backing materials, and air space, the more faceplate covered rate(from 0% to 66%), the lower the resonant frequencies goes, and the vibrat absorption effect of faceplate make the sound absorption coefficient a little promotion.
2.In the same cover rate, backing materials, and air space,the more perforation is(form 7.9% to 14.8%),the higher the resonant frequency goes, and the high frequencies goes up, too.
3.When the perforated bamboo composite panel backing with Malamine foams, the sound absorption coefficient of whole frequencies is greater than the without one, and the resonant frequency goes lower slightly,too.
4.In the same cover rate, perforation, and backing materials, the larger the air space is(from 5cm to 10cm), the lower the resonant frequency goes,but there is no variation in high frequency(over 2000Hz).It showed that make the air space get larger would not weaken the sound absorption coefficient in high frequency, and also make the sound absorption coefficient in low frequency increasingly.
This study have also found out a suitable prediction formula for resonant frequencies of perforated bamboo composite panel by multiple regression analysis, too.