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时间:2019-02-25
《液压专业毕业论文中英文资料外文翻译文献100吨四柱式液压机系统》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、毕业设计(论文)中英文对照资料外文翻译文献(此文档为word格式,下载后您可任意编辑修改!)1、外文翻译是毕业设计(论文)的主要内容之一,必须学生独立完成。2、外文翻译译文内容应与学生的专业或毕业设计(论文)内容相关,不得少于XXXX印刷符号。3、外文翻译译文用A4纸打印,需包含中文翻译和英文原文。4、年月日等的填写,用阿拉伯数字书写,要符合《关于出版物上数字用法的试行规定》,如“2017年5月26日”。5、所有签名必须手写,不得打卬。附件:外文原文HydraulictransienttheoryBeforeweembarkingontheanalys
2、isofpressuretransientphenomenaandthederivationoftheappropriatewaveequations,itwillbeusefulltodescribethegeneralmechanismofpressurepropagationbyreferencetotheeventsfllowingtheinstantaneousclosureofavaluepostionedatthemed-lengthpointofafrictionlesspipelinecarryingfluidbetweentwore
3、servoirs.Thetwopipelinesectionsupstreamanddownstreamofthevalueareidenticalinallrespects.Transientpressurewaveswillbepropagatedinbothpipesbyvalveoperationanditwillbeassumedthatrateofvalueclosureprecludestheuseofrigidcolumntheory.Asthevalveisclosed,sothefluideapproachingitsupstrea
4、mfaceisretardedwithaconsequentcompressionofthefludeandanexpansionodthepipecross-section.Theincreaseinpressureatthevalveresultsinapressurewavebeingpropagatedupstreamwhichconveystheretardationofflowtothecolumnoffluidapproachingthevalvealongtheupstreampipeline.Thispressurewavetrave
5、lsthroughthefluidattheappropriatesonicvelocity,whichwillbeshowntodependonthepropertiesofthefluidandthepipematerial・Similarly,onthedownstreamsideofthevalvetheretardationofflowresultsinareductioninpressureatthevalve,withtheresultthatanegativepressurewavesispropagatedalongthedownst
6、reampipewhich,inturn,retardsthefluidflow.ltwillbeassumedthatthispressuredropinthedownstreampipeisinsufficienttoreducethefluidpressuretoeitheritsvapourpressureoritsdissolvedgasreleasepressure,whichmaybeconsiderabledifferent.Thus,closureofthevalveresultsinpropagationofpressurewave
7、salongbothpipesand,althoughthesewavesareofdifferentsignrelativetothesteadypressureinthepipepriortovalveoperation,theeffectistoretardtheflowinbothpipesections.Thepipeitselfisaffectedbythewavepropagationastheupstreampipeswellsasthepressurerisewavepassesalongit,whilethedownstreampi
8、pecontractsduetothepassageofthepressurereductin
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