自動化專業(yè)英語原文和翻譯

1、精品文檔an automatic controller compares the actual value of the plant output with the desired value,determines the deviation,and produces a control signal which will reduce the deviation to zero or to small value. the manner in which the automatic controller produces the control signal is called the co

2、ntrol action.自動控制器把對象的實際輸出與期望值進行比較，確定偏差，并產(chǎn)生一個使誤差為零或微小值的控制信號。自動控制器產(chǎn)生控制信號的方式叫做控制作用。here we shall present the basic control actions commonly used in industrial automatic controllers. first we shall introduce the principle of operation of automatic controllers and the methods for generating various cont

3、rol signals,such as the use of the derivative and integral of the error signal. next we shall discuss the effects of particular control modes on the system performance. then we shall give a brief discussion of methods for reducing the effects of external disturbances on the system performance. final

4、ly,we shall introduce fluid amplifiers,present basic principles of fluidics,and discuss applications of fluidic devices.這里我們會介紹常用工業(yè)自動控制器的基本控制操作。首先我們會介紹自動機械控制器的操作的原則和產(chǎn)生各種控制信號的方法，如利用導(dǎo)數(shù)和積分求誤差信號。接下來我們會討論特定的控制方式對系統(tǒng)性能的影響。然后我們會簡要地討論一下減少外部干擾影響系統(tǒng)性能的 方法。最后，我們會介紹流體放大器，當(dāng)前射流技術(shù)的基本原理并且討論射流裝置的應(yīng)用。classifications of

5、industrial automatic controllers. industrial automatic controllers may be classified according to their control action as:工業(yè)自動控制器的分類根據(jù)控制作用，工業(yè)自動控制器可分為：(1) two-position or on-off contollers;(1)雙位或繼電器控制器；(2) proportional controllers;(2)比例控制器；(3) integral controllers;(3)積分控制器；(4) proportional-plus-integ

6、ral controllers;(4)比例-積分控制器；(5) proportional-plus-derivative controllers;(5)比例-微分控制器；(6) proportional-plus-derivative-plus-integral controllers.(6)比例-微分-積分控制器。3歡迎下載most industrial automatic controllers use electricity or pressurized fluid such as oil or air as power sources. automatic controllers ma

7、y also be classified according to the kind of power employed in the operation,such as pneumatic controllers,hydraulic controllers,or electronic controllers. what kind of controller to use must be decided by the nature of the plant and the operating conditions,including such considerations as safety,

8、availability,reliability, accuracy,weight,and size.大多數(shù)工業(yè)自動控制器采用電或諸如油或空氣一類的壓縮流體作為能源。自動控制器還可以根據(jù)工作時使用的能源分類，如氣動控制器、液壓控制器或者電動控制器。控制器的選用取決于對象的性質(zhì)和工作條件，包括安全性、實用性、可靠性、精度、重量和體積等方面的考 慮。elements of industrial automatic controllers. an automatic controller must detect the actuating error signal,which is usually

9、at a very low power level. and amplify it to a sufficiently high level. thus,an amplifier is necessary. the output of an automatic controller is fed to a power device,such as a pneumatic motor or valve,a hydraulic motor,or an electric motor.工作自動控制器的元件自動控制器必須檢測出功率通常很小的誤差信號，并將其放大到足夠大的強度。因此，放大器是必不可少的。自

10、動控制器的輸出被傳送到動力設(shè)備， 如氣動發(fā) 動機或氣動閥、液壓電動機或電動機。the cantroller usually consists of an error detector and amplifier. the measuring element is a device that converts the output variable into another suitable variable,such as a displacement,pressure,or electric signal,which can be used for comparing the output

11、to the reference input signal. this element is in the feedback path of the closed-loop system. the set point of the controller must be converted to reference input of the same units as the feedback signal from the measuring element. the amplifies amplifies the power of the actuaing error signal, which in tuen operates the actuator. the actuator is an element which alters the input to the plant according to the control signal so that the feedback signal may be brought into correspondence with the reference input signal.控制器一般由誤差檢測器和放大器組成。測量元件是將輸出變量轉(zhuǎn)換為其他合適的形式的變量，如移位、壓力或電信號等這些都可