穿孔板和薄板吸声系数和频谱经验公式

new theory is put forward that the sound absorption principle of perforated panel is similar to non-perforated plate. They absorb sound by the vibration of panel, while not the pores of them. Base of this description, the empirical formulas of sound absorption coefficients of perforated panel and non-perforated plate(diaphragm) are obtained, i.e. the sound absorption coefficients are descend with the increase of resonance frequency linearly. In addition, sound absorption spectrum formulas of perforated panel and non-perforated plate (diaphragm) have also been found, they can be 0.1 to the power of function of resonance frequency’s sequence number and bandwidth.