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1、Lesson16 AutomaticControlSystemSectionIWordsandPhrasesSectionIITextandTranslationSectionIIIExercisesandAnswers词英汉练答NextEndSectionIWordsandPhasesvariable[5vZEriEbl]n.[数]变数,可变物,变量adj.可变的,不定的,易变的,[数]变量的manipulate[mE5nipjuleit]vt.(熟练地)操作,使用(机器等),操纵(人或市价、市场)vt.(熟练地)操作,巧妙地
2、处理transmitter[trAnz5mitE]n.转送者,传导物,发报机,话筒,发射机tank[tANk]n.(盛液体,气体的大容器)桶、箱、罐、槽,池塘,坦克,战车,柜,储水池AboveTopicNextEndSectionIWordsandPhasesdeviation[7di:vi5eiFEn]n.背离,偏离feedback[5fi:dbAk]n.[无]回授,反馈,反应externalsignal[自]外部信号disturbance[dis5tE:bEns]n.骚动,扰动,骚乱stability[stE5biliti]
3、n.稳定性consequently[5kRnsIkwEntlI]adv.从而,因此oscillation[7Csi5leiFEn]n.摆动,振动AboveTopicNextEndSectionIITextAnautomaticcontrolsystem1isapresetclosed-loopcontrol2system.Anautomaticcontrolsystemhastwoprocessvariablesass-ociatedwithit: acontrolledvariableandamanipulatedvariab
4、le.Acontrolledvariable3istheprocessvariablethatismaintainedataspecifiedvalueorwithinaspecifiedrange.Inthepreviousexample（thewatertanklevelcontrolsystem）,thestoragetanklevelisthecontrolledvariable.Amanipulatedvariable4istheprocessvariablethatisactedonbythecontrolsyste
5、mtomaintainthecontrolledvari-ableatthespecifiedvalueorwithinthespecifiedrange.Forthepre-viousexample,theflowrateofthewatersuppliedtothetankisthemanipulatedvariable.FunctionsofAutomaticControlInanyautomaticcontrolsystem,thefourbasicfunctionsthatoccurare:Measurement，Co
6、mparison，Computation,Correction.Inthewatertanklevelcontrolsystemintheexampleabove,thelev-eltransmittermeasuresthelevelwithinthetank.Theleveltransmitt-ersendsasignalrepresentingthetankleveltothelevelcontroldev-ice,whereitiscomparedtoadesiredtanklevel.Thelevelcontrolde
7、vicethencomputeshowfartoopenthesupplyvalvetocorrectAboveTopicNextEnd汉SectionIITextanydifferencebetweenactualanddesiredtanklevels.ElementsofAutomaticControlThethreefunctionalelementsneededtoperformthefunctionsofanautomaticcontrolsystemare:Ameasurementelement,Anerr-ord
8、etectionelementandAfinalcontrolelement5.Relationsbetweentheseelementsandfunctionstheyperforminanautomaticcontrolsystemareshowninfig
