为了讨论离散性频率噪声，本文提出了多叶叶道流速激发的概念和计算公式。
A concept and a numerical formula of flowing velocity on many blades are presented to discuss noise in the discrete frequency.
撞击自鸣噪声是物体受到撞击时，被激发起的振动所辐射的声音。
Ringing noise is radiated by the vibrational parts when they impact with each other.
对于非简谐阱，这种激发具有能量选择特性，它又取决于电流噪声的频谱分布。
For anharmonic trap, this excitation has energy-selective characters, and depends on the frequency spectrum of the current noise.
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