简介: 摘要: 系统介绍预布线工艺在厂修客车中的应用现状,包括模块化线槽设计、线槽及配线整体上车安装等。对预布线工艺的改进和优化进行了探讨,提出了改进建议和措施。
简介:摘要:当前我国的运输行业发展迅速,有效地应用气体保护焊接轨道客车侧墙板调修研究更是重中之重。从气体保护焊接轨道的材料,焊接技术,以及综合调修体制都需要不断发展进步,才能促进我国经济发展。客车的侧墙板是在客车技术应用中最为明显的部位,不断利用新的技术进行加工是很有必要的。气体保护焊接技术需要应用二氧化碳气体对焊接部位进行检查后才能应用,因此,气体保护焊接工艺的研究势在必行。
简介:Basedonfourtree-ringchronologieswhichwasanalyscdwithappropriatecollectionandaccuratedatinginthemiddleTibetanPlateau,anessentialprocedureonreconstructionofpastclimatehasbeenpointedoutinthispaper.First,theresponsefunctionofeachdendrochronologyhasbeenbuiltandusedtoestimatehowring-widthgrowthrespondstovariationsinmonthlyclimaticchange.Second,theclimatefactorswhichcouldbeproducedwithdifferenttree-ringserieshavebeenselected.Then,thetransferfunctionequation,includinganewsetoforthogonalvariables,canbeusedtoreconstructlocalpasttemperatureorprecipitation.Itshouldbeemphasizedthatpriorgrowthhasbeenconsideredintherelationshipbetweenclimatefactorandtree-ringchronology,Besides,somedifferentperiodsforcalibrationandverificationhavebeendivided.Andsomestatisticsandotherkindsofproxydatahavebeenadoptedastestapproaches.Asaresult,thevariationsofairtemperatureduringthelast600yearsandprecipitationduringthelast340yearswerereconstructedbycombiningthesametypesoftree-ringseriesinthemiddleTibet.
简介:AnanalyticalmethodisdevelopedforthestudyofthewavedefendingeffectsoftheV-typebottom-mountedbreakwater.Thebreakwaterisassumedtoberigid,thin,impermeableandverticallylocatedinwaterofconstantdepth.Thefluiddomainisdividedintothreesub-regionsbyanimaginaryinterface.Thevelocitypotentialineachregionisexpandedbyeigenfunctions.Bysatisfyingthecorrespondingboundaryconditionsandnatchingconditionsinandbetweensub-regions,asetoflinearalgebraicequationscanbeobtainedtodeterminetheunknowncoefficientsfortheeigenfunctionexpansionsforeachsub-region.Theaccuracyofthepresentmodelisverifiedbyacomparisonwithexistingresultsforthecaseofanisolatedbreakwater.Numericalresults,intheformofcontourmapsoftherelativewaveamplitudearoundthebreakwater,arepresentedforarangeofwaveandbreakwaterparameters.TheresultsshowthattheV-typebottommountedbreakwaterisgenerallyeffectiveindefendingagainstwaves.Ingeneral,thewaveheightintheprotectedareaisabout20~50percentoftheincidentwaveheight.
简介:摘要:随着国民经济的发展和人民生活水平的提高,对铁路客车装备的水平要求也越来越高,而作为新型铁路客车重要部件之一的塞拉门技术自1997年开始,陆续在我国铁路干线运用的25K型快速车、25T型提速客车、新型25G型客车以及各种高档、高速客车得以广泛的应用和推广,侧门也逐渐由折页门转变为塞拉门型式,电控气动塞拉门也成为了极为便利的开关门装置,其除尘问题也变得越发突出,现在的过滤减压阀大多数为自动除尘型,但其气瓶的除尘口经常会因废尘封堵而无法自动排风除尘,根据现场作业特点,结合过滤减压阀的工作原理,设计一种过滤减压阀除尘作业与吸尘作业同时进行的铁路客车塞拉门过滤减压阀吸尘装置,并从装置特点、预期效果比较等方面对装置设计进行分析。