Power System forced power oscillation is a kind of low frequency oscillation caused by persistent periodic small disturbance.
电力系统强迫功率振荡为持续的周期性小扰动所引起低频振荡现象。
A latitudinal thin slot in 5 mm width was incised on a smooth flat plate. The periodic blow-suction force with different frequency was applied to turbulent boundary layer from a speaker woofer under the plate. The quantitative influence of local periodic blow-suction disturbance with different frequency on statistic character of turbulent boundary layer had been investigated.
在平板湍流边界层的固壁表面沿展向切割一条5mm宽的窄缝，在平板底部用扬声器从壁面向平板湍流边界层内施加不同频率的周期性吹吸扰动，研究不同频率的周期性扰动在平板湍流边界层内发展演化的规律及对平板湍流边界层统计性质的影响。
A current cycle iterative learning algorism is presented for the periodic position relevant nonlinear disturbance in the constant speed state of turntable.
针对高精度转台恒速工作状态时存在的位置相关周期非线性扰动，提出了一种闭环迭代学习算法。
In this paper, the technique of constant temperature anemometry, together with double-hot-wire-sensor probe, is used to carry out experimental study on the turbulent boundary layer, which is controlled by periodic blow-suction disturbance in the low turbulent level wind channel.
本文应用热线测速技术，对风洞中平板湍流边界层壁面施加周期性吹吸扰动进行了试验研究。
Pointing accuracy affected by periodic disturbance torques of the roll/yaw loop is obtained by frequency separation method.
采用频率分离法，分析了周期干扰力矩对卫星滚动/偏航回路姿态控制精度的影响。
Disturbance compensation problem of a three-axis stabilized momentum biased satellite is investigated. In order to improve pointing accuracy of momentum biased satellite, a compensation scheme of periodic disturbance torques is proposed for the roll/yaw loop of momentum biased satellite based on reaction wheels.
为了提高偏置动量卫星姿态控制精度，针对三轴稳定偏置动量卫星滚动/偏航回路周期干扰力矩补偿问题，提出了一种基于反作用飞轮的滚动/偏航回路周期干扰力矩补偿方案。
The results show that the wavy interface and vortex street are caused by the velocity distribution of shear flow and periodic disturbance at the interface.
研究表明波状界面和涡街是由界面处的剪力流速度分布和周期性扰动所造成的。
It can realize the high precise follow up control for the periodic reference input in the wide frequency range and has the strong ability in the resistance to disturbance and the quick convergent speed.
它能够在较宽的频率范围内对周期性的目标输入实现高精度跟踪，并具有较高的抗干扰能力和较快的收敛速度。
The investigation on the initial value problem reveals that the atmospheric 30-60 day periodic oscillation develops stably on the zonal 3-wave mode, and is independent of the initial disturbance as well as the discrepancy of the basic currents between winter and summer.
初值问题的研究发现中高纬大气30－60d振荡呈纬向三波模态发展，与初始扰动和基本气流的冬、夏差别无关。
Additionally, the response of the periodic disturbance of the geomagnetic field, for example, geomagnetic pulsation and ECS, to the interplanetary disturbance, is paid attention on studying the problem in space weather.
此外，地磁周期扰动，如地磁脉动、电离层等效电流体系对行星际扰动的响应也是空间天气学中值得研究的问题。
The filter is applied to the strapdown inertial north finder to eliminate the periodic noise and random disturbance.
该组合滤波器被用于抑制捷联式惯性寻北仪中的周期性噪声和随机干扰。
Effectiveness of the three rejection strategies for typical disturbances in industry process such as random disturbance, periodic disturbance and crude oil switch disturbance is demonstrated by simulations.
仿真研究了三种扰动抑制方法对工业过程中典型的随机扰动、周期性扰动和原油切换扰动的抑制能力。
Due to non-Gaussian problem with periodic disturbance in the industrial process, an improved independent component analysis method based on residual analysis is proposed.
本文根据流程工业中非线性、非高斯的问题，提出了一种基于残差分析的改进独立元分析方法。
Experimental Investigation of Complex Eddy Viscosity Modeling in Turbulent Boundary Layer with Periodic Blow/Suction Disturbance
加入周期吹吸扰动的平板湍流边界层复涡黏模型实验研究
In this space, repetitive and PI control not only realized rapidly tracking of grid voltage, but also eliminated periodic disturbance (harmonics), in this way, achieved the aim of improving the power quality.
在此空间中采用重复PI控制既可以实现对电网电压的快速跟踪，又可以消除系统中存在的周期性扰动信号（谐波），从而达到了优化并网电能质量的目的。
Confirm the existence of oscillations in the control loop, and the exclusion of control valve nonlinear factors cases, this method can distinguish the model-plant mismatch, the controller tuning problem and unmeasured periodic disturbance.
在检测确认系统存在振荡、并排除控制阀非线性因素的情况下，用该方法能区分模型对象失配、控制器过调和不可测周期性扰动的影响。
To reject the position dependent periodic disturbances in precision velocity control systems, a disturbance compensation approach based on finite dimensional repetitive controller is proposed. A sufficient condition for its application is derived and the control system design method is developed.
为抑制精密速率控制系统中的位置周期扰动，提出了一种基于有限维重复控制器的扰动补偿方案，给出了方法应用的充分条件及控制系统的设计方法。
We address the disturbance decoupling problem of periodic and multirate discrete time systems via synchronous controllers.
研究了利用同步控制器解决周期多频采样系统的干扰解耦问题。
The results showed that the amplitude and the frequency of a continuing system natural oscillation frequency with the same or similar single periodic disturbance can lead to continued weak damping power system oscillations contact line.
研究表明，具有持续振幅且频率与系统固有振荡频率相同或相近的周期性扰动可引发弱阻尼系统联络线上持续的功率振荡。
Furthermore, the principle and nature of periodic instantaneous temperature field disturbance and permeation have been discussed with several cases of various types to examine the speed of heat transfer and permeation and damping of temperature wave.
充分讨论了周期性瞬态温度场的扰动、渗透的机理和实质，以几种不同的实例考察了热传播的速度以及温度波的渗透和衰减情况。