小扰动

优化得出的加权函数和小扰动分析模型一起构成混合灵敏度问题的广义被控对象，根据广义被控对象求解H∞电力系统稳定器。

The weighting function which was obtained by optimization and the small disturbance analysis model constituted the generalized controlled object of mixed sensitivity problem .

具势亚声速小扰动流动的格子Boltzmann模拟

Lattice Boltzmann Simulation for the Small Disturbance in the Subsonic - potential Flows

ADI方法求解完全跨声速非定常小扰动方程

Calculation of the complete transonic unsteady small disturbance equation by ADI method

Kerr型介质的增益与光束小扰动空间频率的关系

Relation between Spatial Frequency Due to Small Perturbation of Optical Beam and Gain of Kerr Medium

采用时域仿真与小扰动分析方法，分析不同的负荷特性对系统阻尼以及对PSS参数整定的影响；

The paper uses Time-Domain simulations and Small-Signal analysis to show that different load characteristics have different influences on system damping .

然后，给出一种基于优化过程实现对小扰动稳定域Hopf分岔界面追踪的算法；

Then , a method based on optimal algorithm is presented for properly tracing the Hopf bifurcation segment on SSSR 's boundary .

目前，电力系统主要采用电力系统稳定器（PSS）和FACTS阻尼控制器来抑制低频振荡，提高系统小扰动稳定性。

Currently , Power System Stabilizers ( PSS ) and FACTS damping controllers are widely used to suppress the low frequency oscillations and to improve small signal stability .

用EEAC法分析小扰动电压稳定

Small - disturbance voltage stability analysis with EEAC method

采用的方程是三元非定常跨声速修正小扰动位势方程，使用时间积分法，求解格式是近似因式分解交替方向隐式（ADI）格式。

The numerical procedure solves the unsteady transonic modified three-dimensional small perturbation equation by time accurate alternating direction implicit finite difference scheme .

运用小扰动法和线性PH的思想，采用有限差分亚松弛的数值方法求解了可倾瓦径向动压气体轴承单块瓦的静、动特性方程。

Based on the small perturbation and linearizing PH methods , the equations of the static and dynamic characteristics of three-pad-tilting bearing were deduced , and the numerical results were obtained on the sub-relaxing finite difference method .

近年来，含FACTS元件电力系统的小扰动稳定问题日益引起各国电力工作者的重视，新的研究成果不断出现。

In recent years , the problems of Small Signal Stability about power system which containing FACTS devices has attracted increasing attention to electricity workers in countries , and more new research results are emerging .

本文采用[1]中人为中性方法研究圆管Poiseuille流对有限幅值轴对称小扰动的稳定性。

This paper studies the small finite axisymmetrical disturbance in a Poiseuille flow in a circular pipe .

已有文献表明，用于抑制低频振荡的电力系统稳定器（PSS）装置在增强系统小扰动稳定性的同时，可能对系统暂态稳定性产生不利影响，甚至损害整体功角稳定性。

Power system stabilizers ( PSS ) could be detrimental to the transient stability while boosting the small-signal stability , with the whole rotor angle stability spoiled .

小扰动电压稳定分析的P-H模型及振荡阻尼因子

P-H model for small signal voltage stability analysis and voltage oscillation damping factor

本文讨论催化反应的局部温度波动（Flickering）现象中的Hopf分岔点受周期小扰动的影响。

In this paper , we intend to discuss Hopf bifurcation phenomenon under the effect of the periodic small perturbation on local temperature fluctuations ( flickering ) phenomenon of catalytic reaction .

本文在运行方式相同的情况下，采用次最优控制理论分别对电力系统镇定器（PSS）和强力式励磁调节器（APB）的参数进行了优化，然后计算小扰动动态过程进行比较。

Under a specified set of conditions , parameters of PSS and APB will be optimized with suboptimal control theory , and several little disturbance dynamics are simulated .

本文讨论紧Hausdorff拓扑空间上流的吸引子在小扰动下的坚持性和强稳定性，以及Ω－极限集的一些性质。

The persistence and strong stability of attractors of flows defined on a compact Hausdorff topological space are proved under small perturbation and some properties of Ω - limit sets are given in this paper .

而Lorenz方程组本身只在有限时段内，刻划初始小扰动的线性发展，随着时间的发展，Lorenz系统开始出现混沌，描述了初始扰动的非线性发展，此时其线性化方程组失效。

With the development of time , Lorenz system begins to get into chaotic state , which characterizes the nonlinear evolution of the initial perturbation . In this case , the linearized equations do not hold .

该方法的优点之一是所设计的PSS不仅可提高系统小扰动稳定性，而且可有效阻尼大扰动后的系统振荡。

One of advantages of the method is that PSS designed by this method not only can improve small signal stability of systems , but also can significantly damp out great oscillations brought about by a severe disturbance .

利用无粘非绝热线性化的Boussinesq方程组，采用标准模方法将小扰动的不稳定问题转化为复系数常微分方程组的特征值问题。

The nonviscous , adiabatic linear Boussinesq equations were introduced and the instability problem of disturbance was transformed into an eigenvalue problem of complex variable-coefficient ordinary differential equations by using the normal mode approach .

分别利用小扰动方法和反馈线性化方法将非线性动力学模型线性化，针对姿态回路和位置回路设计了PID控制器，并通过仿真实验验证了所设计控制器的有效性。

On the base of work principle and linear model , Attitude controller and position controller are designed using the classical method of PID . The method and application of the controller are proposed by simulation tests . Then the feedback linearization system with the PID control is presented .

结果表明，Lorenz方程组的线性化方程组刻划了小扰动的线性发展；

It is demonstrated that the linearized version of Lorenz equations describe the evolutions of sufficiently small perturbations , while Lorenz equations themselves characterize the development of the small perturbations only during the finite short time interval .

采用跨音速小扰动（TSD）方程计算了有迎角的旋转体无分离流动，以及均匀进气假设下机头进气道的外流场。

The transonic flow around the revolution bodies at non-zero angles of attack and the external flow about the nose inlet are calculated by using the transonic small disturbance equation .

第二章讨论Navier-Stokes方程弱解的稳定性。我们证明了当初值u0和外力f具有小扰动时，相应的方程解的L~2-范数也变化不大。

In the second part , we prove that the weak solution of the Navier-Stokes equation is stable , namely , if the initial data and the external force make a small perturbation , the perturbation of L2 - norm of the solution is small too .

本文采用近似因式分解（AF2）方法，数值求解二元跨音速小扰动速势方程。

An implicit approximate factorization scheme ( AF2 ) is employed in this paper to obtain the numerical solutions of TSD and TSTD equation .

研究了不可微环节对电力系统小扰动稳定域（SSSR）的影响。

In this paper , the author mainly focuses on the influence of non-differential components to power system small signal stability region ( SSSR ) study .

结果表明，小扰动波向下游传播演化的结果与O-S方程理论解相吻合，而有限幅值扰动波在向下游演化过程中，由于非线性作用，扰动波的增长率产生了较大的变化。

However , the amplification of finite amplitude disturbance waves changes a lots in the lower reaches because of the nonlinear effects .

为了消除低频振荡，基于系统的特征方程、利用Routh判据推导出小扰动稳定判据，对特征根和系统的等效阻抗进行了计算和分析。

To eliminate the low-frequency oscillations , a stability criterion for small disturbances was derived using the Routh criteria based on the characteristic system equation with the characteristic roots and equivalent impedances of the system calculated and analyzed .

通过在一个五机系统中施加小扰动产生振荡模态数据，然后通过改进的Prony算法对振荡模态数据进行分析，分析结果验证了所改进算法的可行性。

A five-machine simulation system with be imposed a small disturbance produces the oscillation mode data . Then we analyze the oscillation mode data by using the improved Prony algorithm . And the results verify the feasibility of the improved Prony algorithm . 3 .

通过建立数学模型定性地讨论了两种不相混的流体之间交界面上小扰动引起的Rayleigh-Taylor和Kelvin-Helmholtz不稳定是否发展的问题，讨论了流体的物理性质对两种不稳定的影响。

The Rayleigh-Taylor and Kelvin-Helmholtz instabilities induced by small disturb in the two unmixed fluids interface are discussed , and the influences by fluids physics properties such as viscidity are also discussed by means of the established mathematical model .