連續流糧食幹燥過程中被控變量與控製變量的選擇
        在連續流糧食幹燥機中，糧食一般要經過若幹幹燥段和緩蘇段

，再經過冷卻段，最後由出料口排出。合適的糧食貯藏含水率是(14±0．5)％，通tong常chang手shou動dong控kong製zhi方fang法fa很hen難nan達da到dao，難nan以yi保bao證zheng幹gan燥zao後hou糧liang食shi的de品pin質zhi。如ru果guo幹gan燥zao後hou含han水shui率lv過guo高gao，需xu要yao進jin行xing二er次ci幹gan燥zao
，將jiang使shi幹gan燥zao成cheng本ben上shang升sheng

，造zao成cheng能neng源yuan浪lang費fei。實shi現xian幹gan燥zao過guo程cheng的de自zi動dong控kong製zhi

，選xuan擇ze合he理li的de被bei控kong變bian量liang和he控kong製zhi變bian量liang
，可ke保bao證zheng出chu機ji糧liang食shi含han水shui率lv均jun勻yun一yi致zhi
，減jian少shao能neng源yuan浪lang費fei，降jiang低di幹gan燥zao成cheng本ben

，提ti高gao幹gan燥zao後hou糧liang食shi品pin質zhi以yi及ji幹gan燥zao機ji的de可ke靠kao性xing和he穩wen定ding性xing，減jian少shao故gu障zhang率lv
，減jian輕qing操cao作zuo人ren員yuan勞lao動dong強qiang度du以yi及ji充chong分fen發fa揮hui幹gan燥zao機ji生sheng產chan能neng力li。
被控變量的選擇
       zaoqidaduoshulianxuliuganzaojizhong，youyuqueshaojingmidujiaogaodezaixianliangshishuifenjianceshebei
，tongchangcaiyongjianjiecanshuzuoweibeikongbianliang，lirutongguopaiqiwendulaikongzhiguwuzuizhonghanshuilv
，weiledechuguwuzuizhonghanshuilvhepaiqiwendujiandehanshuguanxi，xujinxingdaliangdeganzaoshiyan，genjukongzhiyuanli
，shejiyouguanshuxuemoxingdekongzhidianlu。zhezhongbapaiqiwenduzuoweibeikongbianliangdefangfa，suiqidaoyidingdexiaoguo，dankongzhijingdujiaochaBorsum和Bakker Arkema研(yan)究(jiu)了(le)單(dan)級(ji)順(shun)流(liu)式(shi)糧(liang)食(shi)幹(gan)燥(zao)機(ji)的(de)自(zi)控(kong)係(xi)統(tong)

，使(shi)用(yong)一(yi)個(ge)溫(wen)度(du)傳(chuan)感(gan)器(qi)來(lai)檢(jian)測(ce)出(chu)機(ji)糧(liang)食(shi)溫(wen)度(du)的(de)變(bian)化(hua)
，把(ba)出(chu)機(ji)糧(liang)食(shi)溫(wen)度(du)作(zuo)為(wei)一(yi)個(ge)被(bei)控(kong)變(bian)量(liang)
，該(gai)控(kong)製(zhi)器(qi)可(ke)以(yi)保(bao)持(chi)出(chu)機(ji)糧(liang)食(shi)平(ping)均(jun)溫(wen)度(du)在(zai)設(she)定(ding)值(zhi)(±0．5℃)內
，相當於出機糧食含水率偏差為±0．2％。隨(sui)著(zhe)檢(jian)測(ce)傳(chuan)感(gan)技(ji)術(shu)的(de)發(fa)展(zhan)，在(zai)線(xian)糧(liang)食(shi)水(shui)分(fen)傳(chuan)感(gan)器(qi)得(de)到(dao)戶(hu)泛(fan)的(de)應(ying)用(yong)，直(zhi)接(jie)變(bian)量(liang)最(zui)終(zhong)成(cheng)為(wei)被(bei)控(kong)變(bian)量(liang)，本(ben)文(wen)設(she)計(ji)的(de)控(kong)製(zhi)係(xi)統(tong)就(jiu)是(shi)利(li)用(yong)在(zai)線(xian)水(shui)分(fen)傳(chuan)感(gan)器(qi)測(ce)定(ding)出(chu)口(kou)糧(liang)食(shi)實(shi)際(ji)含(han)水(shui)率(lv)，與(yu)給(gei)定(ding)的(de)目(mu)標(biao)值(zhi)進(jin)行(xing)比(bi)較(jiao)，並(bing)將(jiang)此(ci)差(cha)值(zhi)反(fan)饋(kui)給(gei)計(ji)算(suan)機(ji)，通(tong)過(guo)控(kong)製(zhi)係(xi)統(tong)調(tiao)整(zheng)排(pai)糧(liang)電(dian)動(dong)機(ji)的(de)轉(zhuan)速(su)和(he)熱(re)風(feng)溫(wen)度(du)來(lai)確(que)保(bao)最(zui)終(zhong)糧(liang)食(shi)含(han)水(shui)率(lv)接(jie)近(jin)目(mu)標(biao)值(zhi)。
控製變量的選擇
        在糧食幹燥的整個過程中
，影響糧食最終含水率和糧食溫度的因素主要有排糧電動機轉速
、熱風溫度、熱風風量、熱風濕度
、糧食初始含水率、糧食溫度
、幹燥時間
、環境溫度和其他各種擾動等。圖1geichuleliangshiganzaojirengongcaozuomoxing。shejiliangshiganzaozidongkongzhixitong，shangshuyinsuduoerfuza
，qiegeyinsujiancunzaixianghuouhe，bingqieyixiebianliangzaikongzhiguochengzhongcunzaijiaodazhihou，yincixuanzenaxiebianliangzuoweikongzhibianliangshishejiliangshiganzaozidongkongzhixitongdeguanjian。zhejiuxuyaofenxilianxuliuliangshiganzaoguochengyingxiangyinsudelingmindu，genjulingmindudedaxiao，quedinggeyinsuduiganzaoguochengkongzhideyingxiang，bingduiyingxiangjiaodadeyinsujinxingkongzhi，yingxiangjiaoxiaodeyinsubukongzhihuoshiweiganrao。

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