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赶快为我摘几篇英语作文（优秀的）谢急!!!

发表时间：2024-07-09 12:04:34 来源：网友投稿

GeneralOperatingPrincipleofHydraulicBuffers

ReferringtoFig.3,undertheinfluenceofanexternalforcethepistonrod(orplunger)ispushedintothecylinderinwhichthereisaNewtonian,incompressiblefluid，forexampleoil.

Duringmovementofthepistonintothecylinderthefluidisforcedthroughapreciselycalibratedorificewhichcanbeanannularorifice,slotsorathrottlewhichtransformsthepressureenergy,generatedinthefluidbytheforceofthepiston,intoheatenergy.

Thewayinwhichthepressureenergyistransformedintoheatisafunctionofthelengthofthepassagethroughtheorifice,thevelocityoftheorificeandthegeometricinletandoutletconditionsoftheorifice.

Thereactionforceofahydraulicbufferisthereforealwaysafunctionoftheplungerspeedmovingintothebuffercylinder.

Atverylowplungerspeedsthedynamicthrottlingeffectisalmostzeroandthereactionforceofthebufferderivesfromthestaticforceoftherecoilspringdrivenmechanicallyorbygasdependingontypeofbuffer.

Thebasicoperatingprincipleisthesameforalltwobufferseries.

DuringcompressionoftheHerkules‖buffer,thehydraulicoilisforcedthroughsmallholdsinthecylindertubetothecylinderwhereitisretainedbyarubbermembrane.ThisrubbermembraneseparatestheoilfromthegasreservoirwhichisitselfenclosedbytheouterreservoirtubeInthefullyextendedpositionthegas(nitrogen)inthebufferispre-compressedtoabout5bar.Whenthepistonrodslidesintothecylinder,thegasvolumeiscompressedbythedisplacedoil.Sincethegasvolumeisconsiderablygreaterthanthedisplacedoilvolume,thereisonlyaslightincreaseinthegaspressuretowardstheendofthestrokeandthusonlyaslightincreaseinthebufferresetforce.

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