When the rotational frequency exceeds the forced commutation frequency specified with the status of the FST pins, the operation mode is switched to the sensorless mode.
当转动频率超过FST引脚状态指定的强制换向频率后，运行模式切换到无传感器运行模式。
Unlike the better balanced straight-six or even the ultra-smooth V-12 engine, the humble four-cylinder generates an up and down vibration with a frequency of twice the crankshaft's rotational speed.
不像运行起来比它更稳定的直列六缸引擎或者极其流畅的V - 12引擎，卑微的四缸引擎会以一种比自身机轴转速高两倍的频率产生一上一下的振动。
The application shows that it can analyze the change of the short-time energy of vector signals as frequency and time change, being applicable to the fault diagnosis of rotational machinery.
研究表明，短时矢功率谱可以对矢量信号的短时能量随频率、时间等的变化过程作出分析，可以应用于旋转机械故障诊断实践中。
To enlarge measurement range of particle rotational speed, a dual- frequency imaging method was presented, with mathematical analysis and proving experiment.
为提高颗粒转速测量范围，提出了双帧频拍摄法，并进行了数学推导和实验验证。
The results showed that the mount spacing can be varied to adjust the natural frequency of the rotational mode.
结果说明：改变隔振元件的间距能调整扭转振动的固有频率的大小。
Influence of rotational speed on the time-dependent displacement response variance and influence of sampling frequency on the time-dependent displacement response variance curve are discussed.
讨论了不同转速对位移响应时变方差的影响和不同采样角频率对位移响应时变方差曲线的影响。
By analysing some different types of isolating configurations, the relations between the natural frequency of rotational vibration and that of the linear vibration have been found.
通过对几种不同的隔振形式的分析，得到了扭转振动的固有频率与线性振动的固有频率之间的关系。
Host by motor direct start running, differential speed and drum rotational speed adjustment accomplished by frequency converter.
主机由电机直接启动运转，差速器的调速及转鼓转速的调整由变频器来完成。
Two kinds of wind power generation systems are introduced as well as the frequency control, power control and rotational speed control of generator in parallel operation.
介绍了风力发电系统的两种形式和并网运行的频率控制、功率控制、发电机转速控制。
The dynamic rigidity mechanism is obtained by discussing the effect of rotational speed of single connecting rod elastic arm on frequency and amplitude on the basis of dynamic model.
以单连杆弹性臂动力学模型为基础讨论转速对频率、振幅的影响，得出了动力刚化的机理，并对其是否考虑动力刚化效应时进行了数值仿真比较与分析。
Order analysis based on FFT is a transform between time-domain signal and frequency-domain signal and furthermore, it is the most important vibration analysis of rotational machinery.
阶次分析是基于FFT的一种时频转换谱分析，它是变速旋转机械体振动分析的最重要的一种方法。
The ball mill′s rotational speed can only affect the impact force and frequency and has no influence on its separation point between balls and mill wall.
高能球磨机的转速不会影响磨球与磨筒壁的脱离点，只会影响磨球对粉体的撞击力及撞击频率。
By the method of frequency measurement, instant rotational speed is measured in the test system, angular acceleration is calculated by using the feature of the MCU with the least square method.
介绍了一种发动机无外载功率检测系统的软、硬件设计，利用测频法测量出某一时刻的瞬时速度，并利用最小二乘法求出角加速度。
In this process, using the frequency changer to control the fans 'rotational speed.
在此过程中，采用变频器调速控制风机转速。
These sensors have high frequency response, high sample rates, and high rotational speeds as standard features.
这些传感器拥有高频特性、高采样率以及高转速等标准特性。
Though asymmetry stator mistuned may result in bigger amplitude aerodynamic force with the same frequency as rotational speed, it could reduce effectively the aerodynamic force of blade as a whole.
不对称叶栅非谐设计虽然会引起与转速同频的较大幅值激振力成分，但从整体考虑可有效降低叶片振动应力。
Though asymmetry stator mistuned may result in bigger amplitude aerodynamic force with the same frequency as rotational speed, it could reduce effectively the aerodynamic force of blade as a whole.
不对称叶栅非谐设计虽然会引起与转速同频的较大幅值激振力成分，但从整体考虑可有效降低叶片振动应力。
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