简介：心若有灵,万物皆诗。清晨的燕声黎明,栖息于竹杠上的燕子,反复的呢喃揭开了村庄捂了一夜的秘密。农家人的日子,在清晨第一缕燕影下打开。透过山寨朴素的屋檐,你依旧在父辈编织的竹片墙壁上,筑起爱的暖巢。燕子,传说来自天堂的使者,将农家清贫的

简介：摘要：随着我国电气化铁路的快速发展，铁路交通运输在国内运输行业当中起着举足轻重的作用，铁路的安全运行不仅影响国民经济的发展，同时也关系着人民生命财产安全。因此，深入研究设备运行情况，不断优化设备运行质量，对提高牵引供电系统的安全性和可靠性、保证设备的正常运行具有重要的实际意义。本文对某电气化高速铁路牵引变电所110kV变压器故障进行分析。

简介：根据西安地铁试验段钻孔灌注桩周边土体深层竖向位移监测试验资料及泥浆浸湿对比资料，对黄土地区灌注桩施工过程中土体不同深度位移及泥浆浸湿范围进行了研究，为钻孔灌注桩的工程应用提供有益的理论依据和参考．

简介：Acomplianttowerismodeledasapartiallydry,partiallytapered,dampedTimoshenkobeamwiththesuperstructuremodeledasaneccentrictipmass,andanon-classicaldampedboundaryatthebase.Thefoundationismodeledasacombinationofalinearspringandatorsionalspring,alongwithparallellinearandtorsionaldampers(Kelvin-Voigtmodel).Thesuperstructureaddstothekineticenergyofthesystemwithoutaffectingthepotentialenergy,therebyreducingthenaturalfrequencies.Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam,reducingitsnaturalfrequenciesfurther.Theemptyspacefactorduetothetruss-typestructureofthetowerisincluded.Theeffectofsheardeformationandrotaryinertiaareincludedinthevibrationanalysis;withthenon-uniformbeammode-shapesbeingaweightedsumoftheuniformbeammode-shapessatisfyingtheendcondition.TheweightsareevaluatedbytheRayleigh-Ritz(RR)method,andverifiedusingfiniteelementmethod(FEM).Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam.Kelvin-Voigtmodelofstructuraldampingisincluded.Apartofthestructurebeingunderwater,thevirtualaddedinertiaisincludedtocalculatethewetnaturalfrequencies.Aparametricstudyisdoneforvariousmagnitudesoftipmassandvariouslevelsofsubmergence.ThecomputationalefficiencyandaccuracyoftheRayleigh-Ritzmethod,ascomparedtotheFEA,hasbeendemonstrated.Theadvantageofusingclosed-formtrialfunctionsisclearlyseenintheefficacyofcalculatingthevariousenergycomponentsintheRRmethod.