重慶理工大學(xué)畢業(yè)論文磁流變液動壓軸承設(shè)計目錄摘要..............................................................IAbstract...........................................................II1磁流變液動壓軸承介紹..............................................11.1磁流變液的介紹.............................................11.1.1磁流變液定義]1[....................................................................................11.1.2磁流變液的制備....................................................................................11.1.3磁流變液應(yīng)用范圍.................................................................................21.1.4磁流變液應(yīng)滿足的指標(biāo)：....................................................................31.1.5磁流變液發(fā)展其前景............................................................................31.2滑動軸承簡介................................................41.3磁流變液動壓軸承............................................52方案設(shè)計以及選取..................................................52.1滑動軸承的分類..............................................52.2滑動軸承的選取.............................................72.3電磁場的添加................................................92.4密封方式選擇...............................................112.5軸承座選取以及建模.........................................122.5.1軸承座上端..........................................................................................132.5.2軸承座下端..........................................................................................142.5.3軸瓦......................................................................................................142.5.4軸承裝配圖..........................................................................................153.1滑動軸承的處電磁引入.......................................163.2磁流變液的添加.............................................173.3磁流變液動壓軸承原理.......................................193.3.1磁流變液添加以及電線接入..............................................................193.3.2磁流變液裝載位置..............................................................................193.3.3磁流變液的密封..................................................................................204主要尺寸以及主要計算.............................................214.1軸承座的具體尺寸...........................................214.1.1軸承座上端..........................................................................................214.1.2軸承座下端..........................................................................................224.1.3軸瓦......................................................................................................244.2滑動軸承所涉及的主要計算.................................................................................244.2.1電磁場的計算......................................................................................244.2.2磁流變液粘度的計算..........................................................................254.2.3磁流變液油膜承載能力計算..............................................................255SolidWorks仿真分析..........................................................................................................265.1爆炸視圖...................................................265.2仿真運動...................................................28重慶理工大學(xué)畢業(yè)論文磁流變液動壓軸承設(shè)計6總結(jié).............................................................30致謝...............................................................31參考文獻...........................................................32文獻綜述............................................錯誤!未定義書簽。重慶理工大學(xué)畢業(yè)論文磁流變液動壓軸承設(shè)計I摘要磁流變液是可磁極化的固體微顆粒在基液中形成的懸浮液，其流變特性可由外加磁場連續(xù)控制。當(dāng)不加磁場時，磁流變液表現(xiàn)出類似牛頓流體的行為；當(dāng)外加磁場時，磁流變液中的磁性顆粒沿磁場方向排成鏈狀，這些鏈狀結(jié)構(gòu)阻止了液體的流動，因而改變了磁流變液的流變特性，其流動表現(xiàn)出Bingham塑性體行為，具有粘性和塑性特性。隨著磁流變液在機械應(yīng)用中的不斷發(fā)展，越來越多的將磁流變液運用于各種機械器件中。磁流變液在外加磁場增強的過程中，液體的粘度隨之增大并最終失去流動性變?yōu)楣虘B(tài)，此過程耗能小、可逆、能產(chǎn)生較大屈服應(yīng)力且在豪秒級內(nèi)完成。利用此一系列性能，在充分考慮磁場、溫度、顆粒尺寸、壁面效應(yīng)和體積濃度等諸因素對應(yīng)用器件影響的基礎(chǔ)上，可開發(fā)各種磁流變阻尼器件。由于磁流變液相變的過程在毫秒量級內(nèi)完成，因此可以做成敏捷度極高的控制元件，用于聯(lián)接和傳遞兩部件之間的力或力矩。如汽車用離合器、制動器等。磁流變液動壓軸承也是基于這個原理設(shè)計的。關(guān)鍵詞：磁流變液動壓軸承設(shè)計重慶理工大學(xué)畢業(yè)論文磁流變液動壓軸承設(shè)計IIAbstractMagnetorheologicalfluidisamagneticpoleofthesolidparticlesinsuspension,formedinthebaseofitsrheologicalpropertiescanbemadeofcontinuouscontrolplusamagneticfield.Whenwithoutmagneticfield,themagneticrheologicalfluidshowedsimilarbehaviorofNewtonianfluid；Whenappliedmagneticfield,themagneticparticlesofmagnetorheologicalfluidalongthemagneticfielddirectioninchain,thechainstructuretopreventtheflowoftheliquid,andthuschangetherheologicalpropertiesofMRF,theflowshowtheBinghamplasticbodybehavior,viscousandplasticcharacteristics.AstheMRFinmechanicalapplicationsdevelopment,moreandmoreapplicationofMRFtovariouskindsofmechanicaldevice.Magnetorheologicalfluidintheprocessofplusenhancedmagneticfield,theliquidviscosityincreaseandeventuallyloseliquidintoasolid,theprocessenergyconsumptionofsmall,reversible,canproducealargeyieldstressandinhousefinishinsecondgrade.Usingthisseriesofperformance,infullconsiderationmagneticfield,temperature,particlesize,surfaceeffectandvolumeconcentration,etc.Variousfactorsinfluence,onthebasisoftheapplicationcomponentscandevelopallkindsofmagnetorheologicaldampingdevices.Duetomagneticrheologicalliquidphasechangeisaccomplishedwithinmillisecondlevel,soyoucanmakeithighagilitycontrolelement,isusedtojoinandtransferforceormomentbetweenthetwoparts.Suchasautomotiveclutch,brake,etc.Magnetorheologicalfluiddynamicpressurebearingisdesignedbasedonthisprinciple.Keywords:magnetorheologicalfluiddynamicpressurebearingdesign重慶理工大學(xué)畢業(yè)論文磁流變液動壓軸承設(shè)計11磁流變液動壓軸承介紹1.1磁流變液的介紹1.1.1磁流變液定義]1[磁流變液（MagnetorheologicalFluid,簡稱MR流體）屬可控流體，是智能材料中研究較為多的一種材料。磁流變液一般由鐵磁性易磁化顆粒、母液油和穩(wěn)定劑三種物質(zhì)構(gòu)成。磁流變液是由高磁導(dǎo)率、低磁滯性的微小軟磁性顆粒和非導(dǎo)磁性液體混合而成的懸浮體。這種懸浮體在零磁場條件下呈現(xiàn)出低粘度的牛頓流體特性；而在強磁場作用下，則呈現(xiàn)出高粘度、低流動性的Binghan體特性。由于磁流變液在磁場作用下的流變是瞬間的、可逆的、而且其流變后的剪切屈服強度與磁場強度具有穩(wěn)定的對應(yīng)關(guān)系，因此是一種用途廣泛、性能優(yōu)良的智能材料。1.1.2磁流變液的制備磁流變液一般由鐵磁性易磁化顆粒、母液油和穩(wěn)定劑三種物質(zhì)構(gòu)成。鐵磁性（軟磁性）固體顆粒有球狀、棒狀和紡錘狀三種形態(tài)，密度為7～8g/cm3，其中球形顆粒的直徑在0.1～500μm范圍內(nèi)。目前可用作磁流變液的鐵磁性固體顆粒是具有較高磁化飽和強度的羰基鐵粉、純鐵粉或鐵合金。由于羰基鐵粉飽和磁化強度為2.15特斯拉，且物性較軟、具有可壓縮性、材料成本低、購買方便，已成為最常用的材料之一。磁流變液的母液油（分散劑）一般是非導(dǎo)磁且性能良好的油，如礦物油、硅油、合成油等,它們須具有較低的零場粘度、較大范圍的溫度穩(wěn)定性、不污染環(huán)境等特性。穩(wěn)定劑用來減緩或防止磁性顆粒沉降的產(chǎn)生。因為磁性顆粒的比重較大，容易沉淀或離心分離，加入少量的穩(wěn)定劑是必須的。磁流變液的穩(wěn)定性主要受兩種因素的影響：一是粒子的聚集結(jié)塊，即粒子相互聚集形成很大的團；二是粒子本身的沉降，即磁性粒子隨時間的沉淀。這兩種因素都可以通過添加劑或表面活性劑來減緩。由超精細(xì)石英粉形成的硅膠是一種典型