控制

A novel quasi-constant frequency hysteresis PWM control approach is presented in this paper. Frequency feedback is introduced in hysteresis current control to stabilize switching frequency. Comparing with the common used constant frequency current mode control, the new approach has better stability, faster transient and higher precision, as well as elimination of sub-harmonic oscillation.

摘 要：本文提出了一种新的准固定频率滞环PWM电流控制方法，该方法在滞环电流控制的基础上，引入频率反馈控制，使开关频率基本固定，解决了目前广泛使用的固定频率电流控制方法具有的次谐波振荡的问题，并且具有稳定性好、相应速度快、控制精度高的优点。

The integrated passive and active vibration is a research focal point of aerospace flexible structure vibration control.

主动控制和被动控制的一体化技术研究是当今航天柔性结构振动控制研究的重点，两种控制方法的结合不仅优点互补，而且提高了控制系统的性能。

In this paper, a tooth for milling tenon electrical control of the entire process, electrical components will be used to achieve the milling work tenon tooth path of automatic and manual control, selected relay - access control systems to accomplish this purpose, it has the advantage of Line intuitive, are most commonly used electrical appliances, the replacement of convenience, cheaper prices, through repeated experiments and demonstration confirmed by the use of electrical components can accurately on a milling machine tenon teeth effective control of the machine tools to improve the control of a certain value .

本文研究了专用榫齿铣电气控制的全部过程，将利用电气元件来实现对榫齿铣工作路径的自动与手动控制，选用了继电-接触系统来完成这一控制目的，它的优点是线路直观，大部分电器均为常用电器，更换方便，价格较便宜，通过反复的实验与论证结果证实所用电气元件能准确对机床榫齿铣进行有效控制，对机床控制的改进有一定的参考价值。

In this paper,based on study of Fuzzy control algorithm and PID algorithm,and for the advantages and disadvantages of this tow algorithm,putting forward the Fuzzy-PID compound control for swivel table control system.

基于对模糊控制算法和PID控制算法的研究，和鉴于两种算法的优缺点，提出了模糊-PID复合控制算法用于转台控制系统中，这种控制算法将大大提高转台抗外部干扰和内部参数变化的鲁棒性能，改善了转台的动、静态特性。

The hot helium temperature follows HTR-10's nuclear power changes slowly, and there is a large coupling between them, so the RPHHT system adopts cascade control, the minor loop is fast, and the major loop is hot helium temperature control loop whose dynamic response is slow; there is also a large coupling between main helium loop and steam-water loop, and both the main steam temperature measure signal and the heating process of the once-through steam generator are delayed, therefore, the MHFMST applies cascade control, the minor is main helium flow control loop whose dynamic response is fast, and the major is the main steam temperature control loop whose dynamic response is slow.

本文运用机理建模法，建立了HTR-10系统动态控制模型，然后进行了动态性能仿真，将堆芯用集中参数表示，冷却剂按一维流动处理；直流蒸汽发生器按二回路工质不同的相分为预热段、蒸发段和过热段，建立了三环节控制模型，得到HTR-10系统控制模型；仿真结果与数值计算结果对比表明，本文所建立的控制模型，能近似地反映HTR-10的动态特性，适合设计控制系统。

One new auto-optimized fuzzy control model of car-engines based on genetic arithmetic was introduced aiming at the problem that the parameters of car-engine are of the discreteness, the nonlinear and the uncertain characteristics, with which it is difficult to control accurately the excess air coefficient and the spark advance angle in dynamic procedure when using a conventional control model.

针对汽车发动机参数具有离散性、非线性和不确定性，采用传统控制模型难以精确控制瞬态过程的过量空气系数和点火时刻的问题，提出了一种基于遗传算法的发动机自寻优模糊控制模型。设计了实现该控制模型的嵌入式控制器，讨论了实时在线仿真基础上，采用遗传算法对模糊控制参数的自动寻优。

During this practice, compensation can be put under control though such ways as inter-control system, lower employee resignation rate, compensation cost analysis and budget, variable compensation system, sound compensation cost structure and better corporate culture based on the initiative strategic cost control after combining ways of the domestic and the overseas cost control.

在探析薪酬成本控制的实践中，借鉴国内外企业常用的成本控制途径，思考并提出我国企业应该通过实行主动式战略成本管理，建立企业的内部控制体系，控制企业人才流动率，进行薪酬成本的分析和预算，建立可变薪酬体系和合理的薪酬成本结构，以及加强企业文化建设等途径来实现企业薪酬成本的有效控制，并指出了实现这些途径的一些具体方法。

For a class of Shunt-wound Active Power Line Conditioner, based on analysis of mathematical model of system and target of control, the algorithm of fuzzy variable structure sliding mode control is presented. The control algorithm can avoid complicated calculation of harmonic electric current in traditional control algorithm, and realize the feedback control of electric current. The algorithm is simple and easily implemented.

针对一类并联型有源电网调节器在分析系统数学模型和控制目标的基础上，提出了模糊滑模控制策略，避免了传统控制方法中复杂的谐波电流计算，实现对电源电流的闭环控制，该算法简单、易于实现，仿真结果证实了变结构滑模控制的有效性。

Promax Tension Ind Corp has long sold and manufactured a variety of custo mized air shafts/ air chucks/ safety chucks, edge position control systems/ EPC, powder/ air/ disk brakes and clutches, AC/DC motor control systems, re-winding/ un-winding systems

本公司长久以来已经从事制造及销售有关纸类，薄膜，胶片，纺织品，橡胶等薄片卷材的卷筒物控制糸统周边设备，诸如气涨轴，气涨/安全夹头，边缘追踪器装置，磁粉/气压/碟式煞车器及离合器，交直流转矩马达控制系统，收放料车动系统，张力控制装置，印刷机静态观测器，自动套色控制装置，伺服向量控制系统，人机介面及监控系统及其他有关印刷，贴合，分条，复卷，涂布，上胶，押出，淋膜等产业机械。

This thesis introduces "total volume method" into VAV control schemes, and analyses its advantages.

本文在进行广泛的文献阅读的基础上，对目前采用主要变风量系统形式、变风量末端形式以及主要的系统控制方法进行了分析和对比，指出了静压控制方式的主要缺陷，进而提出了采用&总风量控制方法&对变风量空调系统进行控制，该方法不再以静压作为调节风速的参数，而是以系统当前要求的总风量来调节风机的转速，并分析了总风量控制方法的优势和特点。

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。