坐标系统

This paper introduces a new way of describing the mufti－body system,and set up a new dynamics method of multibody system,which takes the centroid acceleration and angle acceleration of rigid bodies as the variables to be solved.

本文从一个新的角度描述多体系统，建立了一种以刚体质心加速度和刚体角加速度为待解变量、以铰间广义坐标为积分变量的多体系统动力学方法。

At first, the equilibrium discussed in the original system was translated to the origin of the coordinates of the new dynamical system by the change of variables.

首先通过坐标变换，把原系统的平衡点平移到新系统的原点。

Based on the algorithm research, we design and implement a clustering miningprototype VisMMC based on parallel coordinates visualization technology.

在理论研究的基础上，我们结合平行坐标可视化技术设计并实现了一个可视化聚类挖掘原型系统，该系统提供友好的图形用户界面和开放的编程接口。

This paper determines the design idea of combining VISC with structural optimization design. Problems which existed in structural optimization design are analyzed and contents of optimization process are determined. Calling and dominating calculation program written in FORTRAN in the development environment of Delphi are realized by the techniques of FORTRAN/Delphi mixed-language programming and multi-threaded application. Parallel coordinates visualization technology is deeply researched and applied in software exploitation of optimization process. Essential programs of VISC software are compiled. Approaches which can improve efficiency of optimization are discussed. In the end, functional modules are integrated and a typical computational example is verified.

本文通过对结构优化设计和科学可视化的研究，确立了天线结构优化设计与科学计算可视化技术紧密结合的思路；根据天线结构优化设计的特点，针对优化设计中存在的问题，对系统结构优化的总体框架进行了分析和论述，确定了优化过程可视化的具体内容；通过FORTRAN与Delphi的混合语言编程实现了在Delphi环境下对FORTRAN计算程序的调控，充分利用了原有FORTRAN程序资源；对平行坐标技术进行深入研究，并将其应用于优化过程可视化模块的软件开发中，实现多维数据空间的可视化；编写优化计算过程可视化软件的核心程序；探讨了提高优化效率的途径；对基于可视化的天线结构优化设计软件系统进行集成，针对某天线进行了算例验证。

The Optical Coordinate Measuring System is based upon the technique of the digital close range photogrammetry.

光学坐标测量系统是建立在数字近景测量技术基础上的一种新型精密测量系统。

The technique made full use of the characteristic of PR controller which can realize zero steady-state error in AC input signal in stationary frame. In the method, the active and reactive current component in the vector control strategy were transformed in the stationary frame to achieve the objective of keeping the DC-link voltage constant, adjusting the power factor and decoupling the active and reactive power. Compared with conventional double close-loop proportional integral controller, the PR technique is better in harmonic compensation without the complex rotating frame transformation and the couple or feedback voltage which is easily influenced by temperature and circuit parameters. The control algorithm is easy to be realized while the robustness and power quality is improved.

该方法充分利用了PR控制器能够在静止坐标系下对交流输入信号无静差控制的优势，将矢量控制策略下的有功电流和无功电流分量转换到静止坐标系下进行调节，实现网侧变换器维持直流电压稳定和调节功率因数的控制任务和双馈电机有功、无功功率的解耦控制，与传统的双闭环PI控制相比，该策略无需繁琐的坐标旋转变换，不存在受温度及电路参数影响的耦合项和前馈补偿项，且易于实现对系统低次谐波电流的补偿，减小了控制算法实现难度，提高了控制系统的鲁棒性和电网电能质量。

As for the sublinear impact oscillator, firstly we will introduce a new coordinate transformation. Ittransforms the old impact system from right half plane to the whole plane, and translates the system into a new equal system.

对于次线性碰撞振子，我们首先引进新的坐标变换把右半平面上的碰撞问题转化到整个平面上，且将碰撞系统转化为与之等价的新系统。

The main conclusions are as follows.(1) In Cartesian coordinates no catastrophe occurs in the magnetic flux rope system embedded in closed background fields, whereas in spherical coordinates, the system exhibits a catastrophic behavior.

主要结论如下：（1）在直角坐标下，闭合背景场中的磁绳系统不会发生災变；在球坐标下，日冕磁绳系统存在灾变现象。

The GIS system is not only an electronic map, the map basic operation, layer management and other functions, also uses the Global Positioning System to obtain the coordinates of sampling points and real-time display and navigation on the maps.

该系统不仅具有GIS的电子地图显示、地图基本操作、图层管理等功能，还利用全球定位系统来获取采样点的定位坐标，并能在地图上实时显示和导航。

The unitary matrix was constructed by using eigenstates of the controlled quantum system so as to perform a coordinate rotation on the controlled system.

在量子系统中利用被控系统的本征值，构造用来进行坐标旋转的幺正矩阵。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。