The system design variables are magnet external diameter of internal ring, internal diameter of external ring, depth of groove - ring and ampere turns.
系统设计变数为磁铁内环外径、外环内径、槽口深度和安匝数。
By varying the groove spacing, the diameter of the single or double diameter hole, and the rear air cavity depth and content, one can obtain absorption over a wide variety of frequencies.
通过改变槽间距，直径的单人或双人直径孔，与后方空气腔的深度和内容，就可以得到吸收超过各种各样的频率。
Normal methods are restrained to measure the depth of narrow and shallow groove.
在窄浅槽的深度测量方面，常用的测量方法受到很多的限制。
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