恒溫恒濕試驗箱是指(zhi)溫(wen)(wen)(wen)度(du)和(he)濕(shi)(shi)度(du)都能控制(zhi)在(zai)指(zhi)定(ding)范(fan)圍內(nei)的試驗(yan)(yan)箱(xiang)，主(zhu)要(yao)用于機械產品、電(dian)子產品、生物醫藥、化工(gong)(gong)原料、農產品、水產品等(deng)材料在(zai)高(gao)溫(wen)(wen)(wen)、低溫(wen)(wen)(wen)、濕(shi)(shi)熱等(deng)環境條件下貯存、運輸、使(shi)用時的適應性試驗(yan)(yan)。由于恒溫(wen)(wen)(wen)恒濕(shi)(shi)試驗(yan)(yan)箱(xiang)控制(zhi)系統(tong)(tong)是一個(ge)具有(you)多(duo)變量、非線性、大時滯、強耦合的熱工(gong)(gong)系統(tong)(tong)，在(zai)工(gong)(gong)程實際中(zhong)，每(mei)個(ge)回(hui)(hui)路(lu)單獨運行都較正常， 但(dan)在(zai)所(suo)有(you)回(hui)(hui)路(lu)同時工(gong)(gong)作(zuo)時，整個(ge)系統(tong)(tong)就會不穩定(ding)。這是由于恒溫(wen)(wen)(wen)恒濕(shi)(shi)試驗(yan)(yan)箱(xiang)系統(tong)(tong)各控制(zhi)回(hui)(hui)路(lu)之(zhi)間相(xiang)互耦合、相(xiang)互影響、相(xiang)互干擾造成的，如果(guo)把這些回(hui)(hui)路(lu)看(kan)成是互不聯系的而進行單獨設計，顯然極不合理。因此，解(jie)決多(duo)回(hui)(hui)路(lu)之(zhi)間的耦合，以達到穩定(ding)運行和(he)控制(zhi)是極為(wei)關(guan)鍵的。

1、控制(zhi)(zhi)(zhi)回路較多，且(qie)相互(hu)耦(ou)(ou)合控制(zhi)(zhi)(zhi)系統由溫(wen)度(du)、濕(shi)度(du)和(he)(he)壓力(li)傳感器(qi)(qi)、變(bian)風(feng)(feng)(feng)量(liang)控制(zhi)(zhi)(zhi)器(qi)(qi)、風(feng)(feng)(feng)機(ji)變(bian)頻(pin) 器(qi)(qi)、加濕(shi)裝(zhuang)置及其調節(jie)(jie)閥、表冷器(qi)(qi)及其調節(jie)(jie)閥、新回風(feng)(feng)(feng)調節(jie)(jie)閥等組成， 含有送風(feng)(feng)(feng)溫(wen)度(du)控制(zhi)(zhi)(zhi)、室(shi)內(nei)溫(wen)度(du)控制(zhi)(zhi)(zhi)、室(shi)內(nei)相對(dui)濕(shi)度(du)控制(zhi)(zhi)(zhi)和(he)(he)末端風(feng)(feng)(feng)管(guan)靜壓控制(zhi)(zhi)(zhi)4個控制(zhi)(zhi)(zhi)回路，且(qie)各回路相互(hu)耦(ou)(ou)合。

2、控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)系統(tong)建模(mo)(mo)(mo)比(bi)較困(kun)難(nan)恒(heng)(heng)溫(wen)(wen)(wen)恒(heng)(heng)濕(shi)(shi)(shi)(shi)(shi)試驗(yan)箱(xiang)(xiang)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)系統(tong)模(mo)(mo)(mo)型(xing)(xing)的(de)(de)(de)(de)(de)建立是(shi)實現自動控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)和(he)(he)系統(tong)辨 識(shi)的(de)(de)(de)(de)(de)基(ji)礎(chu)。恒(heng)(heng)溫(wen)(wen)(wen)恒(heng)(heng)濕(shi)(shi)(shi)(shi)(shi)試驗(yan)箱(xiang)(xiang)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)系統(tong)模(mo)(mo)(mo)型(xing)(xing)模(mo)(mo)(mo)型(xing)(xing)有(you)兩種：解析模(mo)(mo)(mo)型(xing)(xing)和(he)(he)經(jing)驗(yan)模(mo)(mo)(mo)型(xing)(xing)。前(qian)者研(yan)究恒(heng)(heng)溫(wen)(wen)(wen)恒(heng)(heng)濕(shi)(shi)(shi)(shi)(shi)試驗(yan)箱(xiang)(xiang)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)中的(de)(de)(de)(de)(de)空氣流動、傳熱、傳濕(shi)(shi)(shi)(shi)(shi)等熱力學(xue)特性；后(hou)者則根據實驗(yan)或運行結(jie)果，采用(yong)多項(xiang)式擬合(he)(he)等近似方法(fa)(fa)獲得恒(heng)(heng)溫(wen)(wen)(wen)恒(heng)(heng)濕(shi)(shi)(shi)(shi)(shi)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)的(de)(de)(de)(de)(de)經(jing)驗(yan)模(mo)(mo)(mo)型(xing)(xing)。這(zhe)些方法(fa)(fa)對(dui)恒(heng)(heng)溫(wen)(wen)(wen)恒(heng)(heng)濕(shi)(shi)(shi)(shi)(shi)試驗(yan)箱(xiang)(xiang)的(de)(de)(de)(de)(de)設(she)計(ji)和(he)(he)優化起了重要作用(yong)，但都是(shi)從(cong)靜態的(de)(de)(de)(de)(de)角(jiao)度(du)考察溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)。溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)是(shi)一個多變量、非線(xian)性、強耦(ou)(ou)合(he)(he)、大滯后(hou)、非穩態的(de)(de)(de)(de)(de)復雜過(guo)程(cheng)，需(xu)要從(cong)動態的(de)(de)(de)(de)(de)角(jiao)度(du)研(yan)究溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)參(can)數間的(de)(de)(de)(de)(de)相互耦(ou)(ou)合(he)(he)關系，為實現溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)的(de)(de)(de)(de)(de)在線(xian)監測和(he)(he)自動控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)奠定基(ji)礎(chu)。同(tong)時(shi)，溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)建模(mo)(mo)(mo)存在著一些無法(fa)(fa)彌補(bu)的(de)(de)(de)(de)(de)缺陷，如建立溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du) 控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)數學(xue)模(mo)(mo)(mo)型(xing)(xing)時(shi)做的(de)(de)(de)(de)(de)許(xu)多假設(she)有(you)時(shi)與實際不符。利用(yong)偏微(wei)分模(mo)(mo)(mo)型(xing)(xing)對(dui) 溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)進行模(mo)(mo)(mo)擬時(shi)， 模(mo)(mo)(mo)型(xing)(xing)的(de)(de)(de)(de)(de)求解是(shi)通過(guo)反復迭代(dai)來完成的(de)(de)(de)(de)(de)。不僅模(mo)(mo)(mo)型(xing)(xing)復雜，求解困(kun)難(nan)，而且需(xu)要很長(chang)的(de)(de)(de)(de)(de)計(ji)算時(shi)間。 因(yin)此，建立一個符合(he)(he)實際溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)度(du)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)過(guo)程(cheng)的(de)(de)(de)(de)(de)理想的(de)(de)(de)(de)(de)數學(xue)模(mo)(mo)(mo)型(xing)(xing)是(shi)十分困(kun)難(nan)的(de)(de)(de)(de)(de)，這(zhe)直(zhi)接影(ying)響了恒(heng)(heng)溫(wen)(wen)(wen)恒(heng)(heng)濕(shi)(shi)(shi)(shi)(shi)試驗(yan)箱(xiang)(xiang)的(de)(de)(de)(de)(de)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)精度(du)和(he)(he)控(kong)(kong)(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)效(xiao)果。

3、檢(jian)測儀表與傳(chuan)感(gan)器(qi)(qi)性(xing)能(neng)不穩(wen)定(ding)(ding)檢(jian)測儀表和傳(chuan)感(gan)器(qi)(qi)的(de)(de)(de)性(xing)能(neng)直接影響(xiang)溫(wen)濕度的(de)(de)(de)控制效果(guo)，由于在恒溫(wen)恒濕試驗(yan)箱中(zhong)選(xuan)擇的(de)(de)(de)監測點(dian)的(de)(de)(de)數(shu)量較少以及位置不合理，往往是造成傳(chuan)感(gan)器(qi)(qi)采集的(de)(de)(de)數(shu)據失真，與實際情況有較大(da)差(cha)異(yi)，再加(jia)上國(guo)產的(de)(de)(de)一些溫(wen)濕度傳(chuan)感(gan)器(qi)(qi)的(de)(de)(de)性(xing)能(neng)不穩(wen)定(ding)(ding)，將會(hui)大(da)大(da)影響(xiang)溫(wen)濕度控制的(de)(de)(de)效果(guo)。

東莞市瑞凱環境檢測儀器有限公司是一家擁有20多年(nian)試(shi)(shi)(shi)驗(yan)(yan)(yan)儀器生(sheng)產(chan)制造(zao)經(jing)驗(yan)(yan)(yan)的(de)企業，主要(yao)制造(zao)模擬環(huan)境可靠(kao)性試(shi)(shi)(shi)驗(yan)(yan)(yan)儀器、汽車整車與零部件(jian)可靠(kao)性試(shi)(shi)(shi)驗(yan)(yan)(yan)設(she)備，如：恒(heng)溫恒(heng)濕(shi)試(shi)(shi)(shi)驗(yan)(yan)(yan)箱(xiang)、高低溫試(shi)(shi)(shi)驗(yan)(yan)(yan)箱(xiang)、步入式環(huan)境試(shi)(shi)(shi)驗(yan)(yan)(yan)室、冷(leng)熱沖擊試(shi)(shi)(shi)驗(yan)(yan)(yan)箱(xiang)、高壓加速老化試(shi)(shi)(shi)驗(yan)(yan)(yan)箱(xiang)、溫濕(shi)度振動綜合試(shi)(shi)(shi)驗(yan)(yan)(yan)箱(xiang)等百余品種(zhong)試(shi)(shi)(shi)驗(yan)(yan)(yan)設(she)備，歡迎來電咨(zi)詢。