简介:从青春少年到如今的不惑之年,从一般工作人员成长为基层海事处领导,他就是默默扎根洞头海岛22年,现任温州海事局洞头海事处副处长的吴海峰。22年来,他辛勤付出,荣获浙江省上海世博会“环沪护城河”安保工作先进个人、浙江海事局先进个人、优秀共产党员、第二届“海之美”廉洁守护者。这些荣誉就是他默默坚守丰收的硕果。高中毕业那年,父亲因病早逝,为了照顾家庭,19岁的他毅然选择了继承父业,成为了洞头航管所有史以来最年轻的一名职工。那些与他父亲同龄的父辈们看着他长大,对他可以说是知根知底:“别看吴海峰个子小,但做起事来有板有眼,不输那些科班出身的职工。”
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.