微穿孔板的主动吸声研究

Research of active absorption on tiny hole plate

提出用微穿孔板进行主动吸声的方法。用微穿孔板作为主动吸声的材料,检测出入射声波的频率,得到微穿孔板的共振频率,从而得到微穿孔板背后空腔的深度,移动微穿孔板背后的刚性壁以满足空腔深度的要求,使得吸声系数达到最大,从而达到主动吸声的目的。最后,进行了数值计算与实验,计算结果与实验结果能很较好的吻合,说明了该主动吸声方法的可行性。

A method of active absorption using tiny hole plate is posed. Tiny hole plate is used as the material of active absorption, the frequency of incident sound wave is measured in order to attain the formant frequency and the cavity depth of the tiny hole plate, the rigid wall backed the tiny hole plate is moved satisfied with the cavity depth so that the absorption coefficient is the maximal and the aim of active absorption is attained. At the last, numerical calculation and experiment is carried out, the numerical calculation result is satisfied with the experiment result to illuminate the method feasible.