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- In addition, the envelope of ship noise waveform can be remodulated utilizing Hubert transform, and the spectrum components with line rotation frequency of propeller shaft are extracted effectively by bispectrum analysis. 另外，对于通过Hilbert变换解出的舰船辐射噪声包络进行双谱分析，有效地提取出了舰船轴频线谱。
- At the large flow rate condition, the blade passing frequency is also dominative in the pressure fluctuations, but at the small flow rate condition the rotation frequency becomes dominative. 在大流量工况下，隔舌处和隔板起始端压力脉动频率以叶片通过频率为主，而小流量工况下以叶轮转频为主。
- It makes the ISAR image clearer, and also provides some information of the rotating parts, such as the radius and the rotation frequency. 通过对微多普勒信息的分析，同时也能获得旋转部件的一些运动信息，如旋转半径、旋转频率等。
- Each of the componential signals is decided by the rotating frequency. 该复合信号包含多个信号分量,每个信号分量都具有一个单一的频率,每个单一频率都是由旋转机械的旋转频率决定的。
- If the rotating frequency is known, each of the componential signals would be known. 如果知道旋转机械的旋转频率,就可以知道这些单一频率。
- If we know the rotating frequency, we will know each of the componential signals. 如果我们知道了旋转机械的旋转频率，那么我们也就知道了这些单一频率。
- The seasons follow each other in rotation. 四季循环交替。
- A rotation of personnel; crop rotation. 员工的轮流替换; 农作物的轮作
- He varied the transmission frequency. 他变换了无线电传送的频率。
- The rotation of crops keeps the soil healthy and fertile. 谷物轮种使土壤保持了肥力和高质。
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- The experiment results confirm that the unbalancing vibration of rotor in working rotational frequence is greatly extenuated by using above method and device. 结果证明该方法和装置能够使旋转工作频率下转子的不平衡振动大大减小。
- When the rotational frequency equals the sum (or the difference) of the natural frequencies of the flexural and torsional vibrations, coupled flexural-torsional resonance may occur. 当转动频率接近于扭转振动固有频率与弯曲振动固有频率之和或之差时，可能会发生弯扭耦合共振。
- The sun appears to rise and set because of the earth's rotation. 因为地球在自转,看上去就有了日出和日落。
- The chairmanship of the committee changes in rotation. 委员会主席一职是轮流担任的。
- Fatal accidents have decreased in frequency over recent years. 近年来死亡事故发生的频率已经下降。
- An erotic rotation of the pelvis. 淫荡地晃动卖弄色相地扭动臂部的动作
- We can often correlate age with frequency of illness. 年龄的大小往往与发病率有关。
- Accidents on that highway are happening with increasing frequency. 那条高速公路上车祸发生得越来越频繁。
- A counterweight balances the rotation. 有一个砝码平衡回转。
