查询词典 time-base control

ABSTRACT The researches of this thesis are carried out around the development of high performance machine tool spindle permanent magnet synchronous motor and its drive system. Five parts are included: First of all, concerning the operating characteristics of the machine tool spindle drive system, the optimum current control strategies of spindle PMSM are determined; The design rules of spindle PMSM's key parameters are summarized, based on the study on the influences of the design parameters on the performances of the PMSM operating at different current control strategies; The practical methods to improve the flux-weakening ability of the PMSM are presented; Based on the analysis and comparison of the operating performances of PMSM with different rotor structures, a novel PMSM rotor structure, which is of excellent mechanical performance, suitable for fluxweakening operation and can improve the torque output capacity in the same time, is presented.

本文围绕高性能机床主轴永磁同步电动机及其传动系统的设计研究展开，所做工作主要包括五部分：首先，确定了主轴永磁同步电动机定子电流的最优控制策略；通过对不同控制策略下主要设计参数对主轴永磁同步电动机性能影响的计算研究，总结了参数设计规律；提出了永磁同步电动机弱磁扩速的实用措施；在分析比较不同转子磁路结构电机的性能，尤其是弱磁扩速能力的基础上，提出了一种机械性能优越，易于弱磁扩速，同时能保证电机恒转矩运行时的转矩输出能力的新型转子磁路结构。

The Iterative Learning Control must be used on a repeatable or a peridocital system. By using motion time and iteration times as the two orthogonal vectors, a two-dimensional control system is construct, which can discribe the attribute of the dinamic behavior and learning process completely.

反覆式学习控制必须应用於具有反覆性或周期性的系统，文中将以运动时间与学习次数作为二正交向量来架构二维控制系统，使其能够完整的描述控制系统本身的动态行为与学习过程的特性。

At the same time, the paper analyzed the characteristic of page description language, especially PostScript language, and programmed every element by using PostScript language, exported PS or EPS file after united the whole programs. The main task of the PostScript printing control strip is to control the solid density dot gain print contrast tone reproduction ink trapping grey balances slurs ghostings resolution.

然后，研究和分析页面描述语言的特性，尤其是PostScript语言，以它作为设计平台编写出控制条的各个要素，组合并输出为PS或EPS文件，与待印活件一起输出到印版上或直接印刷，实现对实地密度、网点增大、印刷反差、阶调再现、叠印率、印刷灰平衡、网点变形、重影、分辨率等技术参数的控制。

An S-shape acceleration/deceleration control model is developed by summation progression and the corner of two conjoint lines is adopted as a parametric variable to control the feedrate through the inflexion of two lines. Based on these, interpolation process is divided into two steps: interpolation pretreatment and interpolation point calculation. Feedrate planning is accomplished in the pretreatment step. Interpolation point calculating only depends on the real-time feedrate and the direction vector of the line.

该算法以级数求和的方法推导了S型加减速控制模型，并以小线段夹角为参变量控制拐点通过速度建立了小线段速度衔接模型，在此基础上，算法将插补过程分解为插补预处理及插补点计算两个步骤，预处理中对小线段进行速度规划并设计了线段速度的递推处理方法，插补点仅需根据当前速度及线段方向向量即可求出。

In accordance with these questions, one kind of method solving these issues was put forward in this text, and namely adopting mathematics to build the method of pattern, by w-ay of studying the big needle drum system of PASSIM's cigarette machine, to use the mathematical model of big needle drum system of " black box " method establishment, and uses whole parameter and the correlation coefficient to map out the big needle drum system mathematical model of least square method, the question time lapse that what in accordance with the system exists pure adopts Smith compensator to estimate the compensator in advance solving the issue of system lag, and uses whole fixed method of frequency conversion control engineering and PLC's control engineering and PID etc to put into effect transforming to the system, and finally by way of theory verify and reality to verify to prove the success of system transformation.

针对这些问题，本文提出了一种解决这些问题的办法，即采用数学建模的方法，通过研究PASSIM卷烟机大针鼓系统，利用"黑匣子"方法建立大针鼓系统的数学模型，并运用最小二乘法整定出大针鼓系统数学模型的参数及相关系数，针对系统存在的纯时滞问题，采用史密斯预估计补偿器来解决系统滞后的问题，并利用变频控制技术和PLC控制技术、PID参数整定方法等对系统实施改造，最后通过理论验证和实际验证证明了系统改造的成功。

The time-phase pattern of phycocyanin group is similar to thepattern of the model control group, but the number of the positive cells were significantlyhigh than the number of the model control group.

藻蓝蛋白组在皮层区和纹状体区中阳性细胞表达的变化趋势与模型对照组相似，同一时间点相比较，藻蓝蛋白组阳性细胞数均显著高于模型对照组(P＜0.05)。

The design adopts distribution control system to control the entire system, a higher plane Kingview configuration software for real-time monitoring, the use of spaces on-site Plc programmable controller data collection and use Profibus-wide achieve higher plane of spaces and data exchange between aircraft.

整个设计采用了集散控制系统对整个系统进行控制，上位机采用组态软件组态王进行实时监控，下位机采用可编程序控制器PLC进行现场数据采集，并采用PROFIBUS现场总线实现上位机与下位机之间的数据交换。

Pre-baked aluminum electrolytic cell is a non-linear, multivariable and time-varying system, its model is uncertain. It is difficult to detect the alumina concentration, polar distance, temperature and mole ratio on-line, so we control pre-baked aluminum electrolytic cell by the method of intelligent control.

预焙铝电解槽是一种复杂的非线性、多变量时变系统，模型具有不确定性，浓度、极距、温度和分子比等参数在线检测困难。

According to recent situation of control point data management in practicalness,to tendency and to actual requirement,this essay investigates the organization and input of system data based on MapInfo,based on hard and soft facilities of the computer,based on the technology of GIS,at the same time,this essay puts forward to radical conceptions and methods of the management system of control measurement data.

结合生产实践对控制点测量成果管理的现状、趋势及实际需要，依据GIS的基本原理，以计算机硬软件设备为基础，以地理信息系统为手段，主要针对MapInfo这一系统平台具体讨论了系统数据的组织及入库，提出了GIS在控制点测量成果管理系统的基本构想和方法。

The PI controller which is used widely in water level control of pressurizer in reactor control system usually leads dymanic overshoot and long setting time.

现代的反应堆稳压器的水位控制大都采用的是传统的PI调节器，对于这样一个非线性和时变性的复杂控制系统，PI调节器表现出来的常常是超调量大、调节时间长等并不理想的效果。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。