查询词典 closed system

The matching device automatic test-board is the checking tool checked the matching device capability, precision and reliability are the technique of the the matching device, the precision is the precondition of checking the matching device, the reliability is credibility degree of the decision checking consequent.the topic in view of the existing technique level, the main factors, which influence the measurement precision of the large scale test system, are analyzed in this paper, and the solutions improving the precision are put forward.1 using the multi-channel independent ac to transfer dc module, the power supply of the digit part and the simulation part is discerption, reducing the crosstalk between the digital signal and the simulated signal;2the feedback self-checking module is constructed by singlechip compositive 16 high accuracy a/d , established a closed-loop control system through this module and improved system's overall precision effectively.

匹配装置自动测试台是检测匹配装置性能的检测工具，其重要的技术指标是精度与可靠性，其高精度是作为检测匹配装置的前提，可靠性是决定了检测结果的可靠度。本课题针对现有的技术水平，分析了影响大型检测系统测量精度的主要因素，提出了提高精度的具体方案和办法：1采用了多路独立交流转直流模块，数字部分与模拟部分分开供电，减小了数字信号与模拟信号之间的串扰。2利用单片机集成的16位高精度a/d构建了反馈自检模块，通过该模块建立了一个闭环控制系统，有效地改善了系统的整体精度。

Then the design of PID fuzzy control system based on T-S fuzzy controller is proposed. 5. The parallel distributed compensation method is proposed to devise fuzzy controller based on the existed fuzzy state equation model and its stability theory for continuous and discrete system. The stability of fuzzy closed-loop system is investigated using LMI.

在现有的连续和离散系统的模糊状态方程模型及其稳定性定理的基础上，用"并行分散补偿"方法设计出模糊控制器，利用线性矩阵不等式法对模糊闭环系统的稳定性进行了分析，并且在线性矩阵不等式的基础上设计出了稳定的模糊控制器。

MMDM correction capability is analyzed and a closed-loop correction model of adaptive optical system is established. An adaptive optical experimental system based on MMDM is built. Moreover, wavefront from human eyes is used as the incident wavefront of adaptive optics system.

搭建基于MMDM 的自适应光学实验系统，采用人眼出射波前作为原始波前进行实验，结果表明，模型能快速有效的对动态畸变波前进行校正，为基于MMDM 的自适应光学系统提供了算法支持。

Nanjing University of Aeronautics and Astronautics,Nanjing,210016Switching power amplifier of magnetic bearing was a nonlinear system.The performance of the switching power amplifier affected the stability of the magnetic bearing control system.A way of establishing the closed-loop system model of magnetic bearing was presented.

磁悬浮轴承开关功率放大器系统为一非线性系统，开关功率放大器的性能影响磁悬浮轴承控制系统的稳定性，为此，提出了一种建立磁悬浮轴承开关功率放大器系统模型的方法。

Aimming at the fuel control requirement of micro-turbojet,the automobile's electric fuel pump with adaptable improvement is chosen as fuel-feed system.The performance of fuel pump and the technical difficulty of flux control as the speed of pump doesn't be measured are analyzed.Using Philips 83C552 MCU as the main control chip,the system adopts voltage negative feedback combined current compensation instead of rotation speed negative feedback and a PWM convertor to design the flux closed loop control system.

针对微型涡喷发动机的燃油控制要求，选用汽车用电动油泵进行适应性改进作为供油执行装置，详细分析了电动油泵的特性及泵转速无法测量情况下流量控制的技术难点，并以83C552单片机为核心，采用电压负反馈加电流补偿代替转速负反馈、电机通过PWM驱动的方法设计电动油泵流量闭环控制系统。

For the whole switched system, a suitable switched law is designed to ensure: 1 the state of the closed-loop system, at the time of the transition, resides in the stability region of the mode that the system is switched into; 2 the Lyapunov function for each mode is nonincreasing wherever the mode is reactivated, thereby guaranteeing the stability.

对整个切换系统，设计适当的切换律以保证： 1在切换时刻，闭环系统的状态处在切入系统的稳定区域内； 2切入模块的Lyapunov函数是非增的，从而可保证稳定性。

Firstly, analysis on the problem of stability for the closed loop system in one form of the above system is presented by constructing singular Lyapunov function, a sufficient condition on E-asymptotic stability of the system is given.

首先通过构造广义Lyapunov函数的方法，对其中一类形式的闭环系统稳定性问题进行分析，给出了系统零解E-渐近稳定的充分条件。

The design of output feedback H(subscript ∞) controllers is discussed for nonlinear discrete singular systems. First of all, by means of generalized Lyapunov function and linear matrix inequalities, zero solution E-asymptotically stable is studied for the system, a sufficient condition is given such that the system is zero solution E-asymptotically stable and a H(subscript ∞) norm constraint. And the output feedback H(subscript ∞) controller is designed to guarantee the performance of the resulting closed-loop system.

主要对非线性离散广义系统的输出反馈H控制器的设计问题进行讨论，首先利用广义Lyapunov函数和线性矩阵不等式，对系统的零解E-渐近稳定性问题进行分析，在此条件基础上给出系统零解E-渐近稳定且具有H范数约束的充分条件，然后设计系统的输出反馈H控制器，使得闭环系统具有同样的性能。

Then the running characteristics of the system were tested under different load working conditions. And the energy-saving performance was contrastively analyzed between the closed-circuit system and the valve-controlled system and so on.

试验研究了在不同负载工况下电梯轿厢的速度运行性能，并对比分析了该系统与阀控等系统的节能性能。

Adopt AT89S51 MCU as the main part to realize the automatic control of the object motion locus in this design, system using multiturn potentiometer to measure the position of object, and introduces local closed-loop feedback control system link to correct error, in that case system can improve the accuracy of control and orientation.

设计采用AT89S51单片机作为核心器件实现对物体运动轨迹的自动控制，通过多圈电位器实现对悬挂物位置的精确测量，并引入局部闭环反馈控制环节对误差进行修正。以达到对物体的控制和对坐标点的准确定位。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。