扰动

Lightened on the turbine valve controller designed with feedback linearization theory and introduced nonlinear tracking-differentiator, a novel nonlinear PID valve controller was proposed. This controller can fit not only to plant with some model error and random disturbance in variable, but also to the variety of the structure and operating conditions of power system. The transient and dynamic characters of the controller are both satisfactory when big and small disturbances added. The good performance, wide stable margin and heavy robustness of the valve controller proved that it is a great practical application to enhance the stability of power system.

结合反馈线性化法汽轮发电机组的汽门控制研究成果，引入非线性跟踪微分器和非线性度变换控制，进行了发电机组的非线性PID汽门控制器设计，该控制器不仅能适应一定的系统模型误差与变量的不确定性干扰，而且对于电网结构和运行工况的变化有着较强的适应能力，在受大、小扰动的情况下，呈现了较好的暂态特性和动态品质，具有较好的控制品质、较高的稳定裕度和较强的鲁棒性能，有利于进一步改善电力系统的稳定性，显示了其较强的实用性。

From the experimental results, both in no-load and full-load cases, all the proposed slip estimation schemes exhibit good performances of speed tracking and robust load disturbances rejection.

由实验结果证明不管在无载或满载情况下，所提出四种不同无转速感测的系统都具有良好的转速追踪能力，并且对於负载的扰动系统都拥有很好的强健性能。

There are frequent surface disturbance and severe wind erosion and gravity e...

结果表明：工业广场区水土流失轻微，但粉尘污染严重，重点是营造防污染林带；开挖区地面扰动频繁，风蚀和重力侵蚀加剧，应注重周边溯源侵蚀和崩塌的防护；待开挖区与原地貌水土流失相当，应以暂时性水土保持措施为主；而排土场是在重型机械操作下堆置而成的一种大型人工松散堆积体，是矿区水土流失治理的重点。

Besides, in order to eliminate the effect of grid voltage distortion or disturbance on output current, decoupling control is employed to further improve the quality of output current.

此外，为了消除电网电压畸变或扰动对逆变器输出电流的影响，系统中引入了电网电压前馈解耦控制，改善了系统输出电流的质量。

Buried pipeline response to nearby deep excavation in soft soil is a vital project, which is imbursed by national science fund. Based on the former study, the coupled action of retaining structure, soil and pipeline is firstly considered in this paper.

深基坑开挖工程对邻近地下管线的影响规律研究，是基坑环境工程中的重要课题，也是国家自然科学基金资助重点项目&受施工扰动影响的土体、环境稳定理论和控制方法&的主要研究内容之一。

Contaminated bottom sediment in water system was apt to be disturbed by navigation , especially by propeller jet flow behind the boats.

河流、湖泊中船舶的航行对于水体底部的污染沉积物具有很强的扰动作用，特别是船舶尾部的螺旋桨射流。

But if the disturb is beyond the system endure limit, the balance will not resume.

但是，如果扰动过大，超过系统承受的极限，平衡将不再能恢复。

In this paper, the following progress has been discussed:(1) the improved conjugate gradient algorithm which combines the inversion equation;(2) the formulation for velvet gene at all directions and the approximation method of Jacobian matrics based on disturbance method;(3) the model is adjusted by analyzing the influence of damp coefficient and correction factor to inversion result ;(4) the influence of damp coefficient to the resolution of inversion is studied. to some degree, we improved the problem of "barycenter ascending shift" to electric anomalous body in 3-D resistivity inversion.

本文主要讨论了以下几个方面的内容：（1）结合反演方程式改进的共轭梯度算法；（2）基于扰动法的线源Jacobi矩阵的近似计算方法及光滑系数矩阵在各个方向上的光滑因子的计算公式；（3）通过分析阻尼系数与修改量校正量对反演结果的影响，提出了利用校正系数对模型修正量进行校正；（4）较为系统的讨论了阻尼系数λ对反演分辨能力的影响，较好的改善了三维电阻率反演中的电性异常体重心的&上漂&现象。

A fault detection filter is then designed to make the residual error system exponentially mean-square stable with a prescribed disturbance attenuation level.

设计一个故障检测滤波器，使残差误差系统均方指数稳定且具有一定的扰动衰减水平。

The interaction and the perturbation between a metal-coated fiber probe and an aperture evanescent field is analyzed numerically using finite-difference time-domain method.

采用时域有限差分方法对镀金属膜光纤探针在近场光探测中对光场产生的扰动和相互作用过程进行了数值分析。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐