非对称系统

a kind of design project of multifunction electric power quality gauged instrument based on virtual instrument is put forward in this article.this system integrates virtual instrument programming and power electronics together,to realize diverse signals of current electric power quality field allin one.the integrated signal generator unit which carries out the collection of high speed digital data,d/ a conversion and analog output in four channels,unsymmetrical synchro control fifo etc.by fpga are introduced,the flow of electric power system various signal which generates by vc programming is elaborated,and the structural design of signal amplification unit is analysed.the experiment text result shows that this gauged instrument has attained current advanced high grade of accuracy and it will accelerate the steps of electric power quality calibration because of its accuracy and versatility.

摘 要：提出一种基于虚拟仪器技术的多功能电能质量标定仪的设计方案，采用虚拟仪器编程技术和电力电子技术相结合实现集目前电能质量领域的多样信号于一体。介绍采用fpga实现高速数字量采集、d/a转换及4通道模拟量输出、非对称同步控制fifo等的集成信号发生单元，阐述利用vc编程实现的电力系统多样信号的产生流程，分析信号放大单元的结构设计。实验测试结果表明该标定仪达到目前先进的高精度等级，由于其准确性和多功能性将加快电能质量标定的步伐。

A valve-controlled asymmetric cylinder system has many factors of nonlinearity and uncertainty,whose influence on the stability of the system is complicated.

阀控非对称缸系统存在着大量的非线性和不确定因素，这些因素对系统稳定性的影响非常复杂。

It is focused on a valve-controlled asymmetric cylinder system. The cause and compensation method of friction are researched, and the influence of system friction on electro-hydraulic servo system is analyzed. Then the friction is outline measured and online observed.

以阀控非对称缸系统为研究对象，探讨了摩擦力的产生原因和补偿方法，分析了液压缸的摩擦力对电液伺服系统的影响，对摩擦力进行了离线计算和在线观测两方面的研究。

Some useful notations and definitions are give in this chapter.In Chapter 2,a class of discrete-time model of two-cell cellular neural networks with symmetric temptate are investigated. We obtain some results about the stability,asymptotic stability,the existence and attractability of 2-periodic solutions.

第三章讨论了反馈矩阵为非对称矩阵的二元离散细胞神经网络模型的稳定性与渐近稳定性、周期解的存在吸引性，除了得到系统稳定和存在2-周期解的相关结果外，还得到了系统在原点出现类似于Hopf分支的局部分支以及多个吸引4k-周期解的共同存在性。

We have designed an unsymmetrical and non-coaxial KBA x-ray microscope working at grazing incidence, and have analyzed the aberrations and imaging quality of this system.

我们设计了一套非对称非共轴的KBA掠入射X射线显微镜，并分析了该系统的像差和成像质量。

The hexapod stiffness, which is moveable platform stiffness relative to fixed base frame, generally, is a non-symmetric matrix. It can map the infinitesimal increments in the displacement and in the applied forces , representing the characteristics of forces/displacements in incremental form and relating to machine head displacements when subjects to externally applied force system. It is no doubt that the displacements will affect machine accuracy, especially with the tool under changeable load system.

六杆机构加工中心的刚度意味着输出端移动平台相对于固定基础平台的刚度，一般地，它是一个非对称的刚度矩阵，它将位移微小增量转换成微小力增量，表现了增量形式的力/位特征，关系到机床加工头受有外载荷系统时的位移，直接影响到加工精度，特别是变载荷系统下的加工精度。

Though establishing kinetic differential equation system and solving, the natural frequency, the angle displacement and torsional vibration force moment can be known.

烧结机驱动装置属半悬挂非对称型柔性传动，为利用动力学的观点分析解决设备故障问题，将系统简化为四质量系统力学模型，通过建立运动微分方程组并求解，可得到系统的固有频率、扭振的角位移和扭振力矩。

The analysis results show the effect of non-symmetry film force, nonlinear stiffness and nonlinear friction force on dynamical behavior of rotor system has great relation with rotation speed. The chaotic behavior could exist in a widder parameter region, and the chaotic evolutive rule is more complicated.

发现非对称油膜力、非线性刚度和非线性摩擦力对转子系统动力学行为的影响与转速有很大关系，碰摩转子系统可以在较大参数范围内出现混沌运动状态，并且混沌运动的演化规律更为复杂。

At first, it studied the plant model of position and force system about valve control unsymmetrical hydraulic ram.

首先，建立了阀控非对称缸位置控制系统与力控制系统的数学模型。

This article discusses model set - up and dynamic characteristics of hydraulic serve position control used for unsymmetrical oil cylinder of Sendzimir Mill screwdown.

本文研究了森吉米尔轧机压下系统机液伺服位置控制系统非对称油缸的建模问题和动态特性，并给出了计算结果。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失