论文部分内容阅读
微穿孔板的穿孔面积（例如百分之一左右）比一般都低，所以在稍高的声强下，穿孔内的质点速度可达到相当高的数值（和声速比），因而将影响微穿孔板的声阻抗和它的特性。理论证明，穿孔，做为短的细管所受影响不大，但其末端改正则由于形成喷注，使其声阻大为增加，声质量则稍有降低。后果是使微穿孔板适用的声强范围受限，但也可以根据这个规律延伸微穿孔板的使用到更高声强。文中将举例说明这些关系。
The perforation area of a micro-perforated plate is, for example, about 1% lower than usual so that at slightly higher sound intensities, the particle velocity within the perforation can reach quite high values (and the sound velocity ratio) and thus affect the microperforation The acoustic impedance of the board and its characteristics. The theory proves that perforation has little effect as a short thin tube, but its end correction is due to the formation of jet, so that the acoustic resistance is greatly increased, the sound quality is slightly reduced. The consequence is a limited range of sound intensities for micro-perforated plates, but it is also possible to extend the use of micro-perforated plates to higher sound intensities based on this rule. The article will illustrate these relationships.