扰动

To high-precision ring permanent magnet torque motor servo system used in direct drive numerical control rotary table with the request of smooth operation at low speed, the precision is mainly restricted by cogging torque.

中文摘要：对于要求在低速下能够平稳运行的高精度直接驱动数控转台用环形永磁力矩电机伺服系统，它的定位精度主要受到以齿槽转矩为主的扰动力矩的影响。

For the characteristic of ring permanent magnet torque motor used in direct drive numerical control round table suffering from the effect of load disturbances and parameter variations, the H∞ controller design methodology without the orthogonality assumptions is combined with m-K iteration in m synthesis to design a m-H∞ speed controller in this paper.

针对直接驱动数控转台用环形永磁力矩电机易受负载扰动及参数变化影响的特点，将去除正交性假设的H∞控制器设计方法与m综合中的m-K迭代法相结合，设计了一个m-H∞速度控制器。

For the characteristic of the ring permanent magnet torque motor used in direct drive numerical control round table suffering from the effect of load disturbances and parameters variations, a multi-objective mixed H2/H∞ static output feedback controller, which makes all poles of the closed-loop system be located within a prescribed linear matrix inequality region D to achieve pole placement, is designed based on LMI.

针对直接驱动数控转台用环形永磁力矩电机易受负载扰动及自身参数变化影响的特点，文中基于线性矩阵不等式(linear matrix inequality， LMI)，设计了一个多目标混合H2/H￥静态输出反馈控制器，该控制器可使闭环系统的极点均落在预先选定的线性矩阵不等式区域D内来实现极点配置。

3The variables that described changing of gas in the room of gas operatedand moving law of piston are thought random.The numerical value answer aboutrandom differential equation is given.

3考虑描述自动机气筒压力变化规律和活塞运动规律的控制方程中各变量的随机扰动，提出了求解随机微分方程组的数值解法。

In the present thesis, firstly, the dispersion relation of an infinite dusty plasmas is studied, it is found that the effects of adiabatic variation, the external magnetic field, the particle collisions and the obliqueness have strong influence on dusty low frequency waves.

本文首先研究了无界尘埃等离子体中低频波的色散关系，发现尘埃绝热电荷扰动、外磁场、粒子碰撞和斜传效应对尘埃低频波都有强烈影响。

Simulations and inversions based on observations for time-dependent 3-D CIT with ground-based GPS network and occultation observations have been performed in recent years.

结合GPS地面台网观测和GPS掩星技术的时变三维电离层层析是近年来发展起来的一种新技术，在电离层形态与扰动的监测研究方面有很大的科学意义和应用价值。

In one case, however, a baseline scenario was constructed by using a geographic information system and remote sensing techniques, and a multiple sea level rise approach with three climate change scenarios – low (0.2 m rise), moderate (0.5 m rise) and high (1 m rise)– to offset data limitations and to account for uncertainties associated with topographic perturbations.

但是，仅在一个情况中，使用了地理信息系统和遥感技术来建构基线情景，用带有三种气候变化情景――低(上升0.2米)、中(上升0.5米)和高(上升1米)――的多海平面上升情景办法来弥补数据方面的限制，并考虑到与地形扰动相关的各种不确定性。

And,the study of propagation properties of open-circuit gray solitons indicates that they are relatively stable under perturbations at least less than 10%.

同时采用波传播的数值解法，分析了它们的传播特性，结果显示它们在小于10％的扰动下是相对稳定的。

Keywords: Banach space;operator;equation;boundary condition;perturbation.

中文关键词：巴拿赫空间；算子；方程；边界条件；扰动

In this study, we proposed a common-path method to reduce the inaccuracy of the phase analysis due to the optical path difference and the disturbance from the external environment.

本研究提出共光程的方式来减少光程差及外在环境扰动对於相位分析时所造成的误差。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。