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控制系統(tǒng)有幾種分類方法
1、按控制原理的不同，自動(dòng)控制系統(tǒng)分為開(kāi)環(huán)控制系統(tǒng)和閉環(huán)控制系統(tǒng)。
開(kāi)環(huán)控制系統(tǒng)在開(kāi)環(huán)控制系統(tǒng)中，系統(tǒng)輸出只受輸入的控制，控制精度和抑制干擾的特性都比較差。開(kāi)環(huán)控制系統(tǒng)中，基于按時(shí)序進(jìn)行邏輯控制的稱為順序控制系統(tǒng)；由順序控制裝置、檢測(cè)元件、執(zhí)行機(jī)構(gòu)和被控工業(yè)對(duì)象所組成。主要應(yīng)用于機(jī)械、化工、物料裝卸運(yùn)輸?shù)冗^(guò)程的控制以及機(jī)械手和生產(chǎn)自動(dòng)線。閉環(huán)控制系統(tǒng)
閉環(huán)控制系統(tǒng)是建立在反饋原理基礎(chǔ)之上的，利用輸出量同期望值的偏差對(duì)系統(tǒng)進(jìn)行控制，可獲得比較好的控制性能。閉環(huán)控制系統(tǒng)又稱反饋控制系統(tǒng)。2、按給定信號(hào)分類，自動(dòng)控制系統(tǒng)可分為恒值控制系統(tǒng)、隨動(dòng)控制系統(tǒng)和程序控制系統(tǒng)。恒值控制系統(tǒng)給定值不變，要求系統(tǒng)輸出量以一定的精度接近給定希望值的系統(tǒng)。如生產(chǎn)過(guò)程中的溫度、壓力、流量、液位高度、電動(dòng)機(jī)轉(zhuǎn)速等自動(dòng)控制系統(tǒng)屬于恒值系統(tǒng)。
隨動(dòng)控制系統(tǒng)給定值按未知時(shí)間函數(shù)變化，要求輸出跟隨給定值的變化。如跟隨衛(wèi)星的雷達(dá)天線系統(tǒng)�？刂葡到y(tǒng)控制系統(tǒng)程序控制系統(tǒng)給定值按一定時(shí)間函數(shù)變化。如程控機(jī)床。


液位計(jì)（Level gauge）是物位儀表的一種。液位計(jì)可分為磁浮子式、內(nèi)浮式、磁翻板、投入式幾種。磁浮球液位計(jì)主要廣泛運(yùn)用于石油加工、食品加工、化工、水處理、制藥、電力和鍋爐等領(lǐng)域中的液位測(cè)量。內(nèi)浮式磁性液位計(jì)是一種雙腔液位計(jì)，被測(cè)介質(zhì)與磁性面板端的腔體隔離，容器端腔體內(nèi)部與浮子經(jīng)過(guò)特殊處理后，確保了浮子跟隨液位的變化線性地傳遞給磁性面板，并清晰準(zhǔn)確地指示出液位的高度。液位計(jì)可測(cè)量強(qiáng)腐蝕型介質(zhì)的液位，測(cè)量高溫介質(zhì)的液位，測(cè)量密封容器的液位，與介質(zhì)的粘度、密度、工作壓力無(wú)關(guān)。
數(shù)字壓力表[2]是在線測(cè)量?jī)x表。它采用電池長(zhǎng)期供電方式，無(wú)需外接電源，安裝使用方便。該產(chǎn)品通過(guò)了計(jì)量認(rèn)證及防爆認(rèn)證，已在石油、化工、電力等領(lǐng)域得到廣泛應(yīng)用。 數(shù)字壓力表高精度、高穩(wěn)定性，誤差≤1%， 內(nèi)電源、微功耗、不銹鋼外殼，數(shù)字壓力表防護(hù)堅(jiān)固，美觀精致。
密度表是指用表格的形式來(lái)展現(xiàn)物質(zhì)密度的表格。密度是一個(gè)物理量，符號(hào)為ρ。通常使用密度來(lái)描述物質(zhì)在單位體積下的質(zhì)量。這個(gè)概念在化學(xué)、材料科學(xué)等其他自然科學(xué)領(lǐng)域也經(jīng)常使用的。
此外，密度也可以引申為一個(gè)量與一個(gè)范圍的比值，作為這種情況下的簡(jiǎn)稱，例如人口密度、磁通密度（又稱磁感應(yīng)強(qiáng)度）。


電阻器（Resistor）在日常生活中一般直接稱為電阻。是一個(gè)限流元件，將電阻接在電路中后，電阻器的阻值是固定的一般是兩個(gè)引腳，它可限制通過(guò)它所連支路的電流大小。阻值不能改變的稱為固定電阻器。阻值可變的稱為電位器或可變電阻器。理想的電阻器是線性的，即通過(guò)電阻器的瞬時(shí)電流與外加瞬時(shí)電壓成正比。用于分壓的可變電阻器。在裸露的電阻體上，緊壓著一至兩個(gè)可移金屬觸點(diǎn)。觸點(diǎn)位置確定電阻體任一端與觸點(diǎn)間的阻值。
焊機(jī)英文名稱：welding machine定義：能為完成焊接過(guò)程提供所需能源和運(yùn)動(dòng)，包括焊絲和(或)焊炬運(yùn)動(dòng)及控制系統(tǒng)的設(shè)備。應(yīng)用學(xué)科：機(jī)械工程（一級(jí)學(xué)科）；焊接與切割（二級(jí)學(xué)科）；焊接與切割工藝裝備與設(shè)備（二級(jí)學(xué)科）



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