附錄一英文文獻：Hydraulictransmissioncontrolisoftenusedinindustry,akindofcontrolmode,itadoptshydrauliccompletedtheprocessofenergy.Becausehydraulictransmissioncontrolmodeofflexibilityandconvenience,hydrauliccontrolinindustrybyextensiveattention.Hydraulictransmissionisresearchtohavepressurefluidforenergymedium,toachievevariousmachineandautomaticcontrolsubjects.Hydraulictransmissionusingthiskindofelementtoallkindsofcontrolcircuitneededsomeloop,againbyorganiccombinationbecomecompletionofacertaincontrolfunctionsoftransmissionsystemtocompleteenergytransferandconversionandcontrol.Fromtheprinciplespeaking,hydraulictransmission,basedonthebasicprinciple,thatis,theprincipleisPASCALpressureofthefluidisconsistentthroughoutthebalance,sothatinthesystem,thesmallerthepistontoppressuresaresmall,andbigonthepistonisalsogreatpressurefrom,thismaintainstheliquidstatic.Sothroughtheliquidtransfer,cangetdifferentservethedifferentpressure,whichcanachievethepurposeofatransformation.Wehavecommontothehydraulicjackistousethisprincipletoachievepowertransfer.Hydraulictransmissionprincipleofhydraulicdriveneededelementsaremainlypowercomponents,actuators,controlelements,auxiliarycomponentsetc.Includinghydraulicpowercomponentsisforhydraulicsystemproducesthepowercomponents,includingvarioushydraulicpump.Hydraulicpumprelyonvolumevariationprincipleforthejob,andsoarealsocommonlycalledvolumehydraulicpump.Gearpumpisthemostcommonkindofhydraulicpump,itthroughthegearsturningtwomeshcampaignmakesaliquid.Otherhydraulicpumpandvanepump,pistonpump,intheselectionofhydraulicmajorproblemsneedingattentionincludeenergyconsumption,efficiency,reducenoise.Hydraulicactuatorsisusedtoexecutewillprovidehydraulicpumpcanturnintomechanicaldevice,mainlyincludinghydrauliccylinderandhydraulicpressuremotor.Hydraulicmotorisworkingwithhydraulicpumptodotheoppositeofthedevice,namelythehydraulicenergyconversion,whichiscalledtheforeignpowerenergy.Hydrauliccontrolelementsareusedtocontroltheflowoffluiddirection,pressureandtheheightofthesizeoftheexpectedtoflowcontrol,tomeetthespecificrequirements.Justbecauseofthehydrauliccontrolcomponentsflexibility,makesthehydrauliccontrolsystemcanaccomplishofdifferentactivities.Hydrauliccontrolelementsaccordingtousecanbedividedintopressurevalves,flowcontrolvalves,directioncontrolvalves.Accordingtotheoperationmodecanbedividedintohumanmanoeuvringvalve,mechanicalmanipulationmethod,electricmanoeuvringvalve,etc.Inadditiontotheabovecomponentsoutside,hydrauliccontrolsystemneedhydraulicauxiliarycomponents.Thesecomponentsincludingpipeandtubefittings,oiltank,filters,accumulatorandsealingdevices.Throughtheaboveeachdevice,wecanbuildahydrauliccircuits.Theso-calledhydraulicloopthroughvarioushydrauliccomponentsisthecorrespondingcontrolcircuit.Accordingtothedifferentcontroltarget,wecandesigndifferentcircuit,suchaspressurecontrolcircuit,speedcontrolcircuit,multi-cylinderworkcontrolcircuit,etc.Accordingtothestructureandcharacteristicsofhydraulicdriveinhydraulicsystemdesign,system,thefirsttoanalysis,then,theprinciplediagramworked,includingsystemwiththisprinciplechartisthesymbolofhydraulicmachinery.Throughcalculatingchoosehydraulicdeviceafterthecompletesystem,andthenagainthedesignanddebug.Inthisprocess,theprinciplechartdrawingisthemostcritical.Itdecidedtoadesignsystemoftheprosandcons.Hydraulictransmissionappliedisstrong,suchasloadingandunloadingDuiMamachinehydraulicsystem,whichisusedasastoragemachinery,inmodernwarehouseuseittoachievetextilesbag,oil,barrelandothergoodsofloadingandunloadingmechanizationwork.Canalsobeusedinuniversalcylindricalgrinderhydraulicsystem,productionpractice.Thesystemischaracteristicofpowerislarger,theproductionefficiencyishigher,stabilityisbetter.Hydraulicasawideapplicationtechnology,inthefutureisabroadprospect.Alongwiththedevelopmentofcomputer,hydrauliccontrolsystemcanandintelligentcontroltechnology,computercontroltechnology,technology,sothattheycancombineinmoreplaces,alsocanplaytheroleinmoresophisticated,moreflexibilitytoaccomplishitscontroltasks譯文：液壓傳動控制是工業(yè)中經常用到的一種控制方式，它采用液壓完成傳遞能量的過程。因為液壓傳動控制方式的靈活性和便捷性，液壓控制在工業(yè)上受到廣泛的重視。液壓傳動是研究以有壓流體為能源介質，來實現各種機械和自動控制的學科。液壓傳動利用這種元件來組成所需要的各種控制回路，再由若干回路有機組合成為完成一定控制功能的傳動系統來完成能量的傳遞、轉換和控制。從原理上來說，液壓傳動所基于的最基本的原理就是帕斯卡原理，就是說，液體各處的壓強是一致的，這樣，在平衡的系統中，比較小的活塞上面施加的壓力比較小，而大的活塞上施加的壓力也比較大，這樣能夠保持液體的靜止。所以通過液體的傳遞，可以得到不同端上的不同的壓力，這樣就可以達到一個變換的目的。我們所常見到的液壓千斤頂就是利用了這個原理來達到力的傳遞。液壓傳動基本原理液壓傳動中所需要的元件主要有動力元件、執(zhí)行元件、控制元件、輔助元件等。其中液壓動力元件是為液壓系統產生動力的部件，主要包括各種液壓泵。液壓泵依靠容積變化原理來工作，所以一般也稱為容積液壓泵。齒輪泵是最常見的一種液壓泵，它通過兩個嚙合的齒輪的轉動使得液體進行運動。其他的液壓泵還有葉片泵、柱塞泵，在選擇液壓泵的時候主要需要注意的問題包括消耗的能量、效率、降低噪音。液壓執(zhí)行元件是用來執(zhí)行將液壓泵提供的液壓能轉變成機械能的裝置，主要包括液壓缸和液壓馬達。液壓馬達是與液壓泵做相反的工作的裝置，也就是把液壓的能量轉換稱為機械能，從而對外做功。液壓控制元件用來控制液體流動的方向、壓力的高低以及對流量的大小進行預期的控制，以滿足特定的工作要求。正是因為液壓控制元器件的靈活性，使得液壓控制系統能夠完成不同的活動。液壓控制元件按照用途可以分成壓力控制閥、流量控制閥、方向控制閥。按照操作方式可以分成人力操縱閥、機械操縱法、電動操縱閥等。除了上述的元件以外，液壓控制系統還需要液壓輔助元件。這些元件包括管路和管接頭、油箱、過濾器、蓄能器和密封裝置。通過以上的各個器件，我們就能夠建設出一個液壓回路。所謂液壓回路就是通過各種液壓器件構成的相應的控制回路。根據不同的控制目標，我們能夠設計不同的回路，比如壓力控制回路、速度控制回路、多缸工作控制回路等。根據液壓傳動的結構及其特點，在液壓系統的設計中，首先要進行系統分析，然后擬定系統的原理圖，其中這個原理圖是用液壓機械符號來表示的。之后通過計算選擇液壓器件，進而再完成系統的設計和調試。這個過程