Combining the cepstrum method could identify the characteristic frequency availably. 结合倒频谱方法可以有效地识别故障特征频率。
In a similar way,radiant energy has a characteristic frequency and length associated with it. 同样,辐射能有其特性频率和相应的波长。
Without changing the period size, the frequency bandgap is varied when the length of the stretching strip is adjusted. 在不改变周期的情况下,通过调整伸长窄带长度可以改变带隙特性频率。
The natural frequency of specimen decreases as the crack length increases. 随着裂纹长度的增加,试样的固有频率逐渐减小。
The swing is a pendulum with a single natural frequency depending on its length. 秋千是只有一个固有频率的摆,此频率决定于它的长度。