不同孔径的分布对穿孔板吸声效果的影响

The Effect of Different Distribution and Sizes of Apertures on Sound Absorption Characteristics of Perforated Plate

本研究是探讨不同孔径的分布对穿孔板吸声效果的影响。实验及理论分析表明,此时的孔径分布,确实存在一个最优化分布的问题。据此,研究组引入新的物理量吸声面积,从而简便的评定全频内吸声效果的优劣。之后,研究组利用数学统筹的方法,结合系统声阻及选择性吸声的原理,通过吸声面积大小的比较,研究了一定参数条件下,使效果最佳的孔径分布方案。通过实验及理论分析表明,该方案是由穿孔率、孔径、板厚等结构参数来共同决定的,这也是孔面积最佳分布点的物理意义。

The study is to investigate the influence of different pore size distribution on the effect of the sound absorption. Experimental and theoretical analysis shows that there is an optimal distribu-tion of the pore size distribution. Accordingly, a new physical sound absorption area is introduced by the study group, thus whether full-range sound absorption effect is good or bad will be evaluated simply. After that, the study group studied the optimum pore size distribution scheme under the condition of certain parameters by using the method of mathematical co-ordination, combining with the principle of acoustic impedance and selective sound absorption, and comparing sound-absorbing area. The results of experiment and theoretical analysis show that the scheme is determined by perforation rate, pore diameter, thickness of the plates and other structural parameters, which is also the physical meaning of the best distribution point of pore area.