《专业英语》PPT课件.ppt

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1、Chapter 8Process Automatic Control System核心单词和词组nAM：Amplitude ModulationnFM：Frequency ModulationnSignal Magnitude：信号幅度nRF：radio frequency：无线电频率，射频nRadio Frequency Identification,RFID:射频识别nAudible frequency：音频nBroadcast station：广播电台，广播站nRadiate：发射，广播,辐射nSubmerge：沉浸，没入水中nIce bath：冰点槽nthermostatic bath

2、：恒温槽核心单词和词组nLinearizer：n.线性化电路 nLine,Linear,Linearizenreproduction：再生，再现，复制，繁殖nBe concerned with：参与，干预nFeedback：反馈nFeedforward：前馈nBimetallic：双金属的nSet point dial：设定刻度，给定刻度nSet point：设定值，给定值nThermostat：温度调节装置，自动调温器句子分析nThe input can be speech,music,or data that is produced at one location and transmit

3、ted efficiently over long distances,permitting faithful recovery of the original input.data or input?句子分析nThe letters AM stand for Amplitude Modulation.They mean that the amplitude or magnitude of a radio frequency(RF)signal is caused to vary according to the magnitude of a lower-frequency signal(au

4、dio,corresponding to audible frequencies)句子分析nThe function of transmitter in an AM broadcast system is to accept the input signal from an input device(microphone),use this signal to control the amplitude of a radio frequency signal(each broadcast station is assigned its own radio frequency),and driv

5、e the output device(the antenna)with a radio frequency current to produce electromagnetic waves radiating into space.句子分析nThe functions of the receiver are to amplify or increase the strength of the relatively weak signal obtained from the antenna,to filter or select the desired radio frequency sign

6、al from the signals of all other broadcast stations,to recover the audio signal from the amplitude variations of the radio frequency signal,and to drive a loudspeaker with this audio signal.句子分析nThe pair of thermocouple junctions,one attached to the object whose temperature is to be measured,the oth

7、er submerged in an ice bath(to establish a stable reference point),presents to the processor a voltage that depends on the temperature difference between the object to be measured and the ice bath.Who?句子分析nIn measurement system,therefore,one expects to be concerned with locating and removing any sma

8、ll errors that might be added to the signal at each step of the processing sequence.8.2 Introduction to Process ControlnA host of：许多，一大群nRegulate：调节nSelf-regulation：自动调节nReference value：参考值，标准值nSet point：设定值，给定值nTank：槽，箱，坦克nLevel:水位，水平，等级nSquare root：平方根nFlow rate：流速，流量核心单词和词组nModification：修改，改进nSig

9、ht tube：瞄准管，液位指示管nControlled variable：被控变量，被控量nControlling variable：控制变量，控制量nEvaluate：估算nMechanical linkage：机械连接nServomechanism：伺服机构，伺服系统nTracking control system：跟踪控制系统nStir：搅拌8.3 Computer Process ControlnRelay bank：继电器组nHierarchical structure：层次结构，分级结构ninitiated：引发的，引导的nProcess-initiated Interrupt：过程引导的中断nTimer-initiated actions：定时器引导的操作nPolling：轮流检测