无系统的

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.Then the thesis expounds the basic component parts,the basic running principle,the running characteristic and transfer function of the BLDCM.And then the thesis detailedly dissertates its research pivot: the simulation of BLDCM system in MATLAB based on the method of Back-EMF and the control system of Digital Signal Processor based on the method of Back-EMF.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

For an uncertain system described by convex combination of interval polynomials, its Hurwitz-stability can be guaranteed by certain subset composed of vertices and edges.

对于由区间多项式的凸组合描述的不确定系统，它的Hurwitz稳定性可由某个仅由顶点和棱边构成的子集来保证，且此集合的大小与系统的维数无

Patented TESA optical reading system.- Delta for the X-axis-thus guaranteeing excellent stability.- TESA REFLEX application software The reference in terms of simplicity and reliability.- Ergonomic design The successful conclusion of an in depth study.- 22 air bearings to ensure a frictionless motion of the three axes.- Choice of two probes TESASTAR with adjustable triggering force or TESASTAR-I indexable probe.- Flexibility TESA MICRO-HITE 3D_F can be supplied with fine adjustment device. By adding a CCD camera, it can be converted into a true optical measuring system for non-contact measurement. II.

主要特征KEY FEATURES：-获得专利的TESA光学读数头系统- X向横梁三角形状结构，具有很好的稳定性- REFLEX测量软件，操作简单，运行可靠-符合人机工程要求的设计经过深入研究获得的结论- 22个空气轴承保证了三轴无摩擦的运动-两种测头可供选择 TESASTAR，触测力可调，TESASTAR-i机械分度式-柔性 TESA MICRO-HITE 3D_F配置精密调节设备，如CCD摄像头，可改造成光学测量系统，作为非接触测量使用。

The basic idea was to discrete the structure and find the load function according to the energy criterion of buckling and the principle of random displacement method. As the critical load is the minimum of the load function, a problem of frame buckling can be transformed into an optimization problem. Therefore, the critical load can be found through solving the optimization problem.

先将结构离散为一个有限自由度系统；然后根据有限自由度系统平衡稳定性的能量准则和随机位移法的基本原理，建立符合能量准则的载荷函数，该函数不为零的最小值即为临界载荷，由此将稳定问题转化为无约束的多维优化问题；最后应用遗传算法求出相应于最优解的目标函数值。

The author made a simulation model in Matlab/Simulink, and did simulation in several conditions such as no load, integrating with power grid, independently modulation of the active and reactive power and capture of the maximum wind power. The simulation results show that analysis is right and have very important guidance signification on experimental systems.

在此基础上，以Matlab/Simulink为工具，建立了系统仿真模型，进行了发电机空载运行、并网、有功、无功功率独立调节、最大风能捕获运行等工况的仿真研究，仿真结果证明理论分析正确，对系统的实验研究具有一定的理论指导意义。

In its own way, United Commercial is an example of the quirks in America's own banking system, which has a few leviathans along with thousands of smaller fry.

联合商业银行本身就是与众不中的美国银行系统的一个代表，该系统是由一些巨无霸加上数以千计的小不点的格局存在。

A new method of subzones coupling for modifying the conventional SPGD AO system is presented to increase the convergence speed of the model-free adaptive optics system.

为了提高这种无模型优化自适应光学系统的收敛速度，提出了基于分区域耦合的新方法以改进传统随机并行梯度下降自适应光学系统的工作方式。

Its composition and work principle are explained. Three problems existing in fully hydraulic brake system, brake pedal rebound and sudden braking, no inching braking; sudden power failure during traveling; spool seizure in fluid feeding valve and brake pump blasting, are analyzed. Concrete improvement measures are suggested.

论述了全液压制动系统的组成及工作原理，就全液压制动系统容易出现的以下三种问题：制动踏板反弹及制动剧烈，无点刹；行走过程中突然失去动力；充液阀阀芯卡死、制动泵炸裂进行了分析，并提出了具体的改进方案。

The economy and performance characteristics of LIYANG car equipped with CVT and MT are studied respectively and compared. 3Based on experimental analysis, the relation among the speed ratio changing rate, oil pressure of driving and driven pulley cylinders, driving pulley input speed and torque, metal belt speed ratio has been studied. Model for getting the ratio changing rate is put forward, and practical equation giving the ratio changing rate is obtained by experiments.

对装有CVT和装有MT的羚羊轿车的经济性和动力性进行了计算和比较分析。3）通过实验分析，研究了主、从动轮油缸压力、主动轮转速、输入转矩和带式无级变速传动速比与速比变化率的关系，建立了获取CVT速比变化率的模型，导出了符合实际规律的实用计算公式。4）应用键合图理论，建立了金属带式无级变速汽车传动系的键合图模型，推导了系统的状态方程。

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