Results show that the acoustic system of micro perforationplate can effectively reduce discharge noise.
试验表明，微穿孔板吸声结构可有效地降低排气噪声。
2
The results of this study can offer some perforationplate and acoustic absorbing body design reference materials for the acoustic engineers and architects.
本文的研究结果可为声学工程师及建筑师提供穿孔板和吸声体设计的参考资料。
3
Results There were 3 types of vessel elements, scalariform vessel, reticulated vessel and pitted vessel, the perforation plates were simple perforationplate.