冲击载荷作用下舰艇管路系统全局参数灵敏度分析(3)

参考献

[1]顾文彬.[][[4]

4　结　论

　　,,管壁厚度影响其次,再其次是靠近自由端的弹簧刚度以及管的内径,管材料的弹性模量、远离自由端的弹簧刚度以及冲击作用时间间隔等其它参数对自由端最大位移的影响微乎其微。其中,材料密度、管壁厚度是两个和质量相关的量。灵敏度分析结果表明质量因素的影响是最主要的。但由于在工程实际中,管材料、厚度以及内径一般比较固定,因此,在本例中有现实意义的是靠近自由端的弹簧刚度及位置,它们是影响自由端最大位移的关键参数,应当重点考虑该弹簧的刚度和位置选取。这说明支吊架的配置会影响到管路系统的冲击动响应。因此,在管路系统抗冲击设计中,必须要具备管路系统抗冲击元器件的配置设计能力。

对于算例的总长为6m的管路系统模型,冲击载荷作用的时间间隔对自由端最大位移的影响微乎其微。但对于实船的几十米长的管路系统而言,类似的冲击

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毛为民,朱石坚,张振中.基于柔性基础的双层隔振系统概率灵敏度分析[J].海军工程大学学报,2005,17(3):52—56.

MaoWeimin,ZhuShijian,JiangHuiming.StudyonOptimiza2tionDesignofHybridVibrationIsolationSystemonflexiblefoundation。ProceedingsoftheASMEInternationalDesignEn2gineeringTechnicalConferencesandComputersandInforma2tioninEngineeringConferences-DETC2005:20thBiennialConf.onMech.VibrationandNoise.LongBeach,CA,UnitedStates,2005,2251—2257.李　睿,SobolIM.灵敏度分析方法在结构动态特性分析中的应用研究[D]:[硕士学位论文].长沙:湖南大学,2003.Sobol’IM.Theoremsandexamplesonhighdimensionalmodelrepresentation[J].ReliabilityEngineeringandSystemSafety,2003,79:187—193.

SaltelliA,TarantolaS,CampolongoF.SensitivityAnalysisasanIngredientofModeling[J].StatisticalScience,2000,15(4):377—395.汪　玉,华宏星.舰船现代冲击理论及应用[M].北京:科学出版社,2005.

期刊论文

156　　　　　　　　　　　JOURNALOFVIBRATIONANDSHOCK　　　　　　　　　　　　Vol.26No.32007

PERFORMANCEEVALUATIONOFSEMIACTIVESTRUCTURAL

CONTROLUSINGVARIABLEDAMPERS

YANGRun2lin,　ZHOUXi2yuan,　YANWei2ming,　SONGBo,　LIUXi2hui

Technology,Beijing　100083,China;21KeyLaboratoryofEarthquakeEngineeringandStructuralRetrofit,SchoolofArchitectureandCivilEngineering,BeijingUniversityofTechnology,Beijing　100022,China;

31ElectronicInformationCenter,MinistryofInformationIndustry,Beijing　100846,China)

1

2

2

1

3

(11DepartmentofCivilEngineering,Civil&EnvironmentEngineeringSchool,BeijingUniversityofScienceand

　　Abstract:　Theauthorsstudyeffectivenessofusingasemiactivevariabledampertocontrolseismicallyexcitedstruc2

tures.Asoneofclassicalexamplesofsemiactivecontrolsystem,variabledampersarewidelyusedforstructuralcontrol.However,recentstudiesshowvariabledampersareeffectiveinreducingseismicresponsesofflexiblestructureswhileitcanbeusedtocontrolresponsesofrigidstructures.Performanceofvariabledampersforvibrationcontrolofstructuresun2derseismicexcitationsisinvestigatedusingharmonicwaveanalysis.Theresultsshowthattheperformanceofvariabledampersinreducingseismicresponseofstructuresdependsontheratioofthedisturbancefrequenciestothenaturalfre2quenciesofstructures,ratherthanthenaturalfrequenciesofstructuresonly.Therefore,theeffectivenessofvariabledampersisassociatedwiththecharacteristicsofthegroundmotionthatexcitesstructures.Inon,thecontrolperform2anceofavariabledamperiscomparedwiththatofapassivedamper.Itoundvariabledampersarenotmoreeffectivethanpassivedampers.

Keywords:vibrationcontrol,semiactivecontrol,evaluation,seismicexcitations

ASYMPTOTICIFORNONLINEARFREQUENCIES

OFICALSHELLSWITHLARGEDEFORMATION

IJian,　LIHong2ying,　GUOXing2hui

(SchoolofSciences,NortheasternUniversity,Shenyang　110004,China)

　　Abstract:　Tosolveweak2nonlinearvibrationproblemsofcylindricalshellswithlargedeformation,anasymptotic

approachtosolutionfornaturalfrequenciesofathincylindricalshellwithgeometricnonlinearitiesisproposed.StartingwiththeDonnelπsshallow2shelltheory,itsnonlinearfrequencyequationswithcubicofdisplacementareobtained.Itsdis2placementandfrequencyareexpandedinapowerseriesofasmallnonlinearparameter.Thecoefficientofthenonlineari2temwiththesameorderisequal.Itleadstoasetofcouplednonlinearalgebraicequationsaboutthefirstorderapproxima2tionsofnonlinearfrequenciesandinitialamplitudes.ThefrequencyequationsareorthogonalanduncoupledbyGalerkinπsmethodandtheirseculartermsareeliminated.Consideringrealsolutionsandnointernalresonancebetweenamplitudesofdifferentmodes,theperturbationmethodwithsmallparameterisusedandthefirstorderapproximationsofnonlinearfre2quenciesarefinallyacquired.ResultsshowthatnonlinearfrequenciesincreasewitheffectoflargegeometricdeformationtakenRelationshipsamonglinearfrequencies,nonlinearfrequenciesandinitialdisplacementsarediscussed.

Keywords:geometricnonlinearities,asymptoticapproach,perturbationmethod,nonlinearfrequencies,internalresonance

GLOBALPARAMETERSENSITIVITYANALYSIS

OFSHIPBOARDPIPINGSYSTEMSUNDERSHOCKLOADS

CHENGang,　WANGYu,　MAOWei2min,　LIZhao2jun,　WUGuang2ming

1

2

3

2

4

(11PostdoctoralWorkingStation,NavalArmingAcademy,Beijing;21MilitaryVesselsInstitute,NavalArmingAcademy,Beijing;31NoiseandVibrationInstitute,NavalUniversityofEngineering,Wuhan;41The701Institute,ChinaShipbuildingCorporation,Shanghai)

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