相位滞后

The linear integral action will lead to phase delay to systems.

线性积分器在提高系统稳态精度的同时，也带来了π/2的相位滞后，恶化了控制系统的品质，时常引起系统快速性与稳定性之间不可调和的矛盾。

A phase advancer has a main AC-AC frequency conversion circuit consisting of thyristors.When sampling circuit detects the zero passage signal produced in rotor current of motor,main circuit controlled with advanced microcomputer controlling technique will change the AC voltage of 380V,50HZ into compensating voltage with the same frequency as that of rotor voltage and rotor current 90°in phase lay to achieve the goal to raise the power factor of the motor.

由可控硅构成的交变频主电路，在采样电路检测到电机转子电流产生的过零信号后，经过先进的微机控制技术控制主电路，将380V、50HZ交流电压转换成转子频率相同，相位滞后转子电流90°的补偿电压，达到提高电动机功率因数的目的。

Results show:(1) coupling of elastic deflections with rigid motions is distinctive;(2) computations of two methods are in good agreement with test data, when rotation angle is small;(3) when rotation angle is large, couplings increase distinctly and the differences between the results of the two computational methods increase;(4) the bending stiffness has evident effect on the coupling, and the coupling will increase with the decrease of bending stiffness;(5) in case of the blade is relatively soft, the calculated values of phase lag and amplitude augment based on infinitesimal rotation will exist.

计算分析表明：(1)弹性桨叶存在较明显的刚性运动和弹性变形耦合；2）挥舞角较小时，两种处理方法计算结果一致，均与试验数据吻合较好；(3挥舞角较大时，刚柔耦合增强，两种处理方法的计算值差别较为明显；(4)桨叶弯曲刚度对桨叶刚柔耦合特性有较明显影响，刚度越小，耦合越强；(5)桨叶如果比较柔软，小转角处理方法计算值相对有限转角处理方法，相位滞后、幅值增加均较为明显，计算桨叶动响应时需引起注意。

Based on the test and analysis of phase lag property, the dyramie property of the system is corrected by circuit.

执行系统经硬件电路校正后，仍存在一定的相位滞后。

The closed-loop bandwidth of the system reaches 10Hz which assures the error of amplitude less than ±10% and the lag of phase less than 10°.

系统的性能指标达到幅值误差在±10%以内、相位滞后小于10°时，闭环频宽为10Hz。

In the AC servo control system, using digital low-pass filter can restrain current feedback noise and improve the resolving power of speed feedback, but it may lead to phase lag of feedback signal and directly influence the response speed.

交流伺服控制中采用数字低通滤波可以抑制电流反馈噪声，提高速度反馈分辨率，但同时会带来反馈信号的相位滞后，将直接影响响应速度。

The numerical results show that the ocean models in diurnal band are more stable than those in semidiurnal band, and the correction of the change in tidal height plays a significant role in determining accurately the phase lag of the tidal gravity.

数值结果说明周日频段内的海潮模型要比半日频段内的模型更加稳定，实施验潮站潮位高变化改正对精密确定重力固体潮相位滞后起重要作用。

Combining the Test Signal Method and the dynamic simulation function of PSS/E, the method can calculate the phase lag of the excitation system with consideration of detailed grid and equipment models, and design the PSS parameters by using the phase compensation and critical amplification factor methods.

基于仿真软件PSS/E提出了一种设计PSS参数的方法，该方法具有如下特点：结合测试信号法和PSS/E的动态仿真功能，在充分考虑全网和各设备详细模型的情况下计算励磁系统相位滞后特性；并采用相位补偿法和临界放大倍数法设计PSS参数。

Through imitates the artificial intelligence control algorithm in the terminal in the big inertia, in the pure time delay system's application, may overcome the traditional PID control the lagging of phase, the integral to be saturated, solution control system's stability and accurate contradiction.

在终端通过仿人工智能控制算法在大惯性、纯滞后系统中的应用，可克服传统PID控制的相位滞后、积分饱和，解决控制系统的稳定性及准确性的矛盾。

However, phase lead may also improve accuracy, and phase lag may improve stability.

然而，相位超前补偿也可以提高系统的准确性，相位滞后补偿也可以提高系统的稳定性。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。