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Rexroth節(jié)流伺服閥4WS2EM10-4X/20B2T315K8DM

電液伺服閥廣泛地應(yīng)用于電液位置,速度,加速度,力伺服系統(tǒng),以及伺服振動(dòng)發(fā)生器中.它具有體積小,結(jié)
伺服閥
構(gòu)緊湊,功率放大系數(shù)高,控制精度高,直線性好,死區(qū)小,靈敏度高,動(dòng)態(tài)性能好以及響應(yīng)速度快等優(yōu)點(diǎn).
參考書(shū)目 劉長(zhǎng)年著《液壓伺服系統(tǒng)的分析與設(shè)計(jì)》，科學(xué)出版社，北京，1985。
4類型
[1] 防滯伺服活門(mén)
該伺服閥屬于兩級(jí)閥，*級(jí)為噴嘴檔板式，由控制信號(hào)控制其出口壓力，第二級(jí)為滑閥式，執(zhí)行控制級(jí)至剎車缸的壓力。當(dāng)無(wú)信號(hào)作用時(shí)， 由於壓力噴嘴出口油壓力的作用，使伺服閥擋板靠在回油噴嘴上，此時(shí)壓力口的油壓作用在滑閥閥芯上，使剎車口同計(jì)量油口直接連通，剎車口壓力同飛行員控制的計(jì)量油壓相等，當(dāng)機(jī)輪角速度檢測(cè)到滑行速度同基準(zhǔn)滑行速度有偏差時(shí)，力矩馬達(dá)接收到偏差電信號(hào)，此時(shí)力矩馬達(dá)驅(qū)動(dòng)檔板向壓力噴嘴偏轉(zhuǎn)，使作用在閥芯上端油壓下降，在閥芯下端油壓作用下，閥芯上移，關(guān)小計(jì)量壓力油口，這將導(dǎo)致控制口壓力降低，控制口壓力降低到某一值時(shí)，就有對(duì)應(yīng)的制動(dòng)壓力。[1] 
5空難
1991年3月3日，聯(lián)合航空585號(hào)班機(jī)為波音737-291型客機(jī)，從丹佛機(jī)場(chǎng)前往科羅拉多泉機(jī)場(chǎng)途中，飛機(jī)垂直尾翼的方向舵突然不受控制轉(zhuǎn)向右面，繼而翻滾，之后直墜地面，機(jī)上20名乘客和5名機(jī)組人員全部遇難。
1994年9月7日，全美航空427號(hào)班機(jī)為波音737-300型客機(jī)，從芝加哥奧黑爾機(jī)場(chǎng)前往匹茲堡機(jī)場(chǎng)途中，突然不受控制轉(zhuǎn)向，繼而翻滾，之后直墜地面，機(jī)上127名乘客和5名機(jī)組人員全部遇難。它的墜機(jī)方式與聯(lián)合航空585號(hào)班機(jī)與東風(fēng)航空517號(hào)很相似。其后發(fā)現(xiàn)原來(lái)波音737客機(jī)的方向舵液壓器在溫差很大時(shí)（30,000呎的-50度到地面的30度，同時(shí)加入高溫液壓液體時(shí)）會(huì)卡住，并且會(huì)導(dǎo)致飛行員給方向盤(pán)控制后由反向偏轉(zhuǎn)的嚴(yán)重后果。這種故障不會(huì)有磨損過(guò)的痕跡，也是NTSB（National Transportation Safety Board）有史以來(lái)調(diào)查時(shí)間zui長(zhǎng)的一系列空難事故之一。這是波音737自運(yùn)行以來(lái)發(fā)現(xiàn)的zui大的致命設(shè)計(jì)錯(cuò)誤（國(guó)家地理《空中浩劫》中S04E04中詳述）。
1996年6月9日，東風(fēng)航空517號(hào)班機(jī)于準(zhǔn)備降落在里奇蒙機(jī)場(chǎng)時(shí)，飛機(jī)突然發(fā)生故障，所幸只有一名空中服務(wù)員受輕傷。飛機(jī)亦成功降落。

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