武科大自动化专业英语(2012A)1893.pdf

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1、.专业 word 可编辑 .试题纸 课程名称：Specified English 适用专业年级：考生学号：考 生 姓 名：1.Words and Terms(1)Please give the complete expression of the abbreviated words,and give the Chinese meaning.(210)1)TF 2)D/A 3)IC 4)I/O 5)ALU 6)CPU 7)PID 8)MIMO 9)GNP 10)VLSI(2)Please translate the English words or terms into Chinese.(120

2、)1)discrete system 2)setting time 3)state variable 4)inverse transform 5)Laplace domain 6)dynamic response 7)automatic process control 8)complex domain 9)initial value 10)classical control 11)gate circuit 12)transient response 13)percent overshoot 14)performance criteria 15)differential equation 16)

3、development system 17)final control system 18)optimal control 19)open loop 20)linear vector space .专业 word 可编辑 .2.Please translate the following sentences into Chinese.(56)(1)Designing a control system is not a precise or well-defined process;rather,it is a sequence of interrelated events.A typical

4、sequence might be 1)modeling of the plant;2)linearization of the plant model;2)dynamic analysis of the plant;4)nonlinear simulation of the plant;5)establishment of the control philosophy&strategy;6)selection of the performance criteria and indices;7)design of the controller;8)dynamic analysis of the

5、 complete system;9)nonlinear simulation of the complete system;10)selection of the hardware to be used;11)construction and test of the development system;12)design of the production model;13)test of the production model (2)open-loop and closed loop control systems.An open-loop system is one in which

6、 the control action is independent of the output.A closed-loop system,however,the input of the plant is somehow dependent on the actual output.Since the output is fed back in a functional form determined by the nature of the feedback elements and then subtracted from the input，a close-loop .专业 word

7、可编辑 .system is often referred to as a negative feedback system or simply as a feedback system.(3)With an advancing technological society,there is a trend towards more ambitious goals.This also means dealing with complex systems with a larger number of interacting components.The need for greater accu

8、racy and efficiency has changed the emphasis on control system performance.The classical specifications in terms of percent overshoot,setting time,bandwidth,etc.,have in many cases given way to optimal criteria such as minimum energy,minimum cost,and minimum time operation.(4)The Laplace transformat

9、ion comes from the area of operational mathematics and is extremely useful in the analysis and design of linear systems.Ordinary differential equations with constant coefficients transform into algebraic equations that can be used to implement the transfer function concept.Furthermore,the Laplace do

10、main is a nice place in which to work,and transfer functions may be easily manipulated,modified,and analyzed.(5)In NAND and NOR gates(as well as an AND and OR gates),when it serves our purpose to do so,we can arbitrarily select one input terminal and view it as an enable-disable input.Thus,consider

11、a NOR or an OR gate.If the one selected input is at logic 1,the output of the gate is independent of all other inputs.this one selected input takes control of the gate and the gate is disabled with respect to any other input.(6)The importance of these components is that they perform the three basic

12、.专业 word 可编辑 .operations that must be present in every control system.these operations are:1)measurement(M):measuring the variable to be controlled is usually done by the combination of sensor and transmitter.2)Decision(D):based on the measurement,the controller must then decide what to do to mainta

13、in the variable at its desired value.3)Action(A):as a result of the controllers decision,the system must then take an action.This is usually accomplished by the final control element.3.Please translate the following sentences into English.(10)PID 控制是将比例、积分、微分三种控制规律结合一起。比例环节的作用是，当偏差一旦产生时，比例调节立即发挥作用，以

14、减少偏差；积分的作用是消除余差；微分的作用是反映偏差的变化，并能在偏差信号变大前，在系统中引入一个有效的修正，从而加快系统的动作速度，减少调节时间。4.Please give Abstract and Key words about the following paper.(15+5)At this time it is necessary to define some terms used in the field of automatic process control.The first term is controlled variable.This is the variable t

15、hat must be maintained or controlled at some desired value.In the preceding example,the process outlet temperature,()T t,is the controlled variable.The second term is set point,the desired value of controlled variable.The manipulated variable is the variable used to maintain the controlled variable

16、at its set pint.In the example,the flow of steam is the manipulated variable.Finally,any variable that can cause the controller variable to deviate away from set point is defined as a disturbance or upset.In most process there are s number of different disturbances.专业 word 可编辑 .What is important her

17、e is to understand that in the process industries,most often it is because of this disturbance that automatic process control is needed.If there were no disturbances,design-operating conditions would prevail and there would be no necessity of continuously“policing”the process.The following additiona

18、l terms are also important.Open loop refers to the condition in which the controller is disconnected from the process.That is,the controller is not making the decision of how to maintain the controlled variable at set point.Another instance in which open-loop control exists is when the action(A)take

19、n by controller does not affect the measurement(M).This is indeed a major flaw in the control system design.Close-loop control refers to the condition in which the controller is connected to the process,comparing the set point to the controlled variable and determining corrective action.With these terms defined,the objective of an automatic process control system can be stated as follows;the objective of an automatic process control system is to use the manipulated variable to maintain the controlled variable at its point in spite of disturbance.