we found that in the frequency range of interests, there is significant noise and it depends strongly on the level of the drive current as expected.
我们发现在感兴趣的频域内有较大的噪声,并且噪声强度依赖于偏置电流的大小。
unreasonable if the structural design, there will be significant noise and vibration, seriously affecting the efficiency of the press, machining accuracy and die life.