外文翻译-污泥处理船用液压系统油路块设计研究

毕业设计（论文）外文文献翻译（本科学生用）题目污泥处理船用液压系统油路块设计研究学生姓名学号学部（系）机械与电气工程学部专业年级09级机械设计制造及其自动化指导教师职称或学位教授2013年2月10日外文文献翻译（译成中文1000字左右）【主要阅读文献不少于5篇，译文后附注文献信息，包括作者、书名（或论文题目）、出版社（或刊物名称）、出版时间（或刊号）、页码。提供所译外文资料附件（印刷类含封面、封底、目录、翻译部分的复印件等，网站类的请附网址及原文】MODELINGOFDYNAMICFRICTIONBEHAVIORSOFHYDRAULICCYLINDERSABSTRACTTHISPAPERDEALSWITHMODELINGOFDYNAMICFRICTIONBEHAVIORSOFHYDRAULICCYLINDERSUSINGHYDRAULICCYLINDERSWITHDIFFERENTPACKINGMATERIALSANDSIZES,FRICTIONCHARACTERISTICSAREEXPERIMENTALLYINVESTIGATEDUNDERDIFFERENTMAGNITUDESOFEXTERNALLOADITISSHOWNTHATTHEDYNAMICFRICTIONCHARACTERISTICSAREAFFECTEDBYTHEPACKINGMATERIALOFTHECYLINDERANDBYTHEPRESSURESINTHECYLINDERCHAMBERSCOMPARISONSBETWEENDYNAMICFRICTIONCHARACTERISTICSMEASUREDANDTHOSEPREDICTEDBYTHEMODIFIEDLUGREMODELSHOWTHATTHEMODELCANNOTSIMULATETHEREALHYSTERETICBEHAVIORSOFTHEFRICTIONFORCEVELOCITYCURVEINTHEFLUIDLUBRICATIONREGIMETHEMODIFIEDLUGREMODELISIMPROVEDBYREPLACINGTHEUSUALFLUIDFRICTIONTERM,WHICHISPROPORTIONALTOVELOCITY,WITHAFIRSTORDERLEADDYNAMICSITISSHOWNTHATTHEPROPOSEDMODELCANGIVEACCURATESIMULATIONRESULTSINTHEFLUIDLUBRICATIONREGIMEKEYWORDSFRICTION；HYDRAULICCYLINDER；MATHEMATICALMODEL；PACKINGMATERIAL；EXTERNALLOADINTRODUCTIONFRICTIONISALWAYSPRESENTINAHYDRAULICCYLINDERSYSTEMANDHASANINFLUENCEONTHEEFFICIENCYANDTHEMOTIONORCONTROLPERFORMANCEOFTHESYSTEMINORDERTOPREDICTTHEBEHAVIORSOFAHYDRAULICCYLINDERSYSTEMORTOIMPROVEITSCONTROLPERFORMANCE,ITISNECESSARYTOFINDANACCURATEMATHEMATICALMODELOFFRICTIONOFTHEHYDRAULICCYLINDERSEVERALMATHEMATICALMODELS,WHICHAREUSEDTODESCRIBETHEFRICTIONBEHAVIORSOBSERVEDINMECHANICALSYSTEMS,HAVEBEENPROPOSEDINLITERATUREHOWEVER,THESEMODELSCANNOTPREDICTTHEDYNAMICFRICTIONBEHAVIORSINTHESLIDINGREGIMEOFAHYDRAULICCYLINDERWHENTHESYSTEMOPERATESUNDEROSCILLATINGVELOCITYCONDITIONSYANADAANDSEKIKAWASTUDIEDTHEDYNAMICFRICTIONCHARACTERISTICSOFAHYDRAULICCYLINDERUNDEROSCILLATINGVELOCITYCONDITIONSINTHENEGATIVERESISTANCEREGIME,IE,INTHEVELOCITYRANGEWHERETHEFRICTIONFORCEDECREASESWITHINCREASINGVELOCITYTHEYHAVESHOWNTHATWHENTHEPISTONVELOCITYVARIESSINUSOIDALLYWITHVELOCITYREVERSALS,THEDYNAMICFRICTIONFORCEVELOCITYCHARACTERITICEXHIBITSAHYSTERETICBEHAVIORFRICTIONALLAGAROUNDTHESTEADYSTATEFRICTIONCHARACTERISTICASSHOWNINFIG1INADDITION,THEYHAVESHOWNADECREASEOFTHEMAXIMUMFRICTIONFORCEOBSERVEDAFTERONECYCLEOFTHEVELOCITYVARIATIONINORDERTOSIMULATETHOSEDYNAMICFRICTIONBEHAVIORSOFTHEHYDRAULICCYLINDER,THEYHAVEMODIFIEDTHELUGREMODELBYINCORPORATINGLUBRICANTFILMDYNAMICSINTOTHEMODELANDHAVESHOWNTHATTHEPROPOSEDMODEL,CALLEDTHEMODIFIEDLUGREMODEL,CANSIMULATETHEDYNAMICFRICTIONBEHAVIORSOBSERVEDEXPERIMENTALLYINTHESLIDINGREGIMEOFTHEHYDRAULICCYLINDERWITHARELATIVELYGOODACCURACYHOWEVER,THEMODIFIEDLUGREMODELHASBEENVALIDATEDSOFARUSINGONLYONETYPEOFHYDRAULICCYLINDERINTHENEGATIVERESISTANCEREGIMETHEVALIDITYOFTHEMODIFIEDLUGREMODELHASNOTBEENINVESTIGATEDINTHEFLUIDLUBRICATIONREGIMEFIG1EXAMPLEOFDYNAMICFRICTIONFORCEVELOCITYCHARACTERISTICFROMYANADAANDSEKIKAWA,2008AVELOCITYVARIATIONF05HZ,BFRICTIONFORCEVSVELOCITYTHEFRICTIONOFAHYDRAULICCYLINDERISDOMINATEDBYTHEFRICTIONCAUSEDBETWEENTHEPISTON/RODSEALSANDCONTACTINGSURFACESEACHMATERIALOFSEALHASITSOWNVISCOELASTICCHARACTERISTICSANDMAYAFFECTTHEFRICTIONCHARACTERISTICSOFTHEHYDRAULICCYLINDERINADDITION,THEPRESSURESACTINGONTHESEALSAFFECTTHEDEFORMATIONOFTHESEALSANDMAYALSOAFFECTTHEFRICTIONCHARACTERISTICSHOWEVER,ITHASNOTBEENMADECLEARHOWTHEDYNAMICBEHAVIORSOFFRICTIONOFHYDRAULICCYLINDERSAREAFFECTEDBYTHEPACKINGMATERIALANDTHEPRESSURESINTHISPAPER,THEDYNAMICFRICTIONCHARACTERISTICSOFHYDRAULICCYLINDERSAREEXAMINEDINBOTHTHENEGATIVERESISTANCEANDFLUIDLUBRICATIONREGIMESUNDERDIFFERENTPACKINGMATERIALSANDEXTERNALLOADSPRESSURESCOMPARISONSOFTHERESULTSMEASUREDWITHTHERESULTSSIMULATEDBYTHEMODIFIEDLUGREMODELAREMADEBASEDONTHECOMPARISONRESULTS,AMODIFICATIONTOTHEMODIFIEDLUGREMODELISPROPOSEDTAKINGFLUIDFRICTIONDYNAMICSINTOCONSIDERATIONANIDENTIFICATIONMETHODOFTHEPARAMETERSOFTHENEWMODELISALSOPROPOSEDCOMPARISONSOFTHERESULTSSIMULATEDBYTHENEWLYPROPOSEDMODELWITHTHEMEASUREDRESULTSAREMADEANDTHEUSEFULNESSOFTHENEWMODELISSHOWNTESTSETUPANDEXPERIMENTSTHETESTSETUPUSEDINTHISINVESTIGATIONISSHOWNINFIG2ASINGLERODHYDRAULICCYLINDER2WASFIXEDVERTICALLYONAFRAME1MADEOFUSHAPEBARSANDTHEHYDRAULICPISTONWASCONNECTEDTOTHELOADMASS5MADEOFSTEELCIRCULARPLATESTHROUGHARECTANGULARSTEELPLATE4THEMOTIONOFTHEHYDRAULICCYLINDERISCONTROLLEDBYASERVOVALVE9TWOPRESSURESENSORS8WITHANACCURACYOF05ROWEREUSEDTOMEASURETHEPRESSURES,P1ANDP2,INTHECYLINDERCHAMBERSTHEPISTONVELOCITY,V,WASMEASUREDUSINGATACHOGENERATOR6WITHARIPPLEOFLESSTHAN2BYCONVERTINGLINEARMOTIONOFTHEPISTONTOROTATIONALMOTIONTHROUGHABALLSCREW3ANDABELT7THEBALLSCREWANDTHETACHOGENERATORWEREMOUNTEDONTHEFRAME1ASSHOWNINFIG2BSIGNALSFROMTHESENSORSWEREREADINTOACOMPUTER10THROUGHA12BITANALOGTODIGITALA/DCONVERTERANDASIGNALFROMTHECOMPUTERWASSUPPLIEDTOTHESERVOVALVETHROUGHA12BITDIGITALTOANALOGD/ACONVERTEREXPERIMENTALDATA,IE,VELOCITY,V,ANDPRESSURES,P1ANDP2,WERERECORDEDATTHEINTERVALOF05MS2KHZTOIMPROVETHEQUALITYOFTHEMEASUREDDATA,ANACAUSALLOWPASSFILTERWITHABANDWIDTHOF150HZWASUSEDTOREDUCETHEMEASUREMENTNOISETHEACCELERATION,A,OFTHEPISTONWASCALCULATEDBYANAPPROXIMATEDIFFE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