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accrodingtostatistics,pleasetellwhichoneisthemainreasonthatcauseacontrolsystemshutdowm,controllers,sensorsoractuators?
actuators
Whenweinstallacontrolvalueinpracticalindustries,whyweusuallyinstellabypassline?Drawthediagram.
Itcanmakethesystemmoresimple,flexible,anditalsocanprotectthesystem
WhypracessengineersalwaysperferDSCorPLCtomiero-chipunits,suchasasinglechipcomputer?Pleasegiveatleast2reasons.
Thecostislow,safetyperformanceisgood
Someonethinkwhenvalve’sopeningis30%,thentheflowrateis30%ofthemaximumflowrate,whatdoyouthink.
Dependingonthevalve,minimumflowcases,valveopeningcannotbelowerthan15%
Wealwaysuse4-20mAotherthan1-5Vforsignalinterfaceinprocesscontrolfield?
Becausethedistancebetweensceneandcontrolroomistoofa,rsoitwillproducealargererro,r.ifweusethissignalsystem,wecanimprovethetransmissionaccuracy.
PID
PleasegivethediscretePIDalgorithm,inincrementformu(k)=u(k-1)+△u(k).Show△u(k).
Largeovershoot, reactionspeedslowlyInwhichconditionscanweconsidertuusederivativeaction?Giveatleast
Largeovershoot, reactionspeedslowly
Whatismosttypicaltransferfunctiontodercribeanindustrialprocess?WhatistheintergraltimeifyoutuneaPIcontrollerforthiskindofprocess?
CSTR
Theoriginaltemperaturecontrolsystemisdesignedonlybymainpulatingthejacketinletvalveopening.Pleasepointontitsproblemswhenappliedinrealprectice,atleast2point.
Radiatorpipeline,solarheatingsystem
Ifthejacketintletpressurefluctuatesgreatly,howtodealwiththisproblem?Drawschematic.
Voltageregulatorvalveattheexitofaflow-limitingvalvewithatracheastringtouse
IftheTjmfluctuatesfromtimetotime,showyouinproveddesign.Drawcontrolblook.
Feedforawrd
what’sthenecessarycondictionforfeedforwardcontrol.Measurableanduncontrollabilityofdisturbancequ
有哪些信誉好的足球投注网站
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