简介：-Inthispaper,mathematicalmodelsanddynamicanalysesforbothSDOFandMDOFstructuresisolatedwithdampersareestablishedandperformed,andacomprehensivecomputationmethodisprovided.TheshockabsorbingeffectisillustratedthroughanexampleofatwoDOFdamper-isolatedsystemexcitedbysinusoidalwavesandactualgroundaccelerationinputrecordedinearthquakes.Itisshownthatmostoftheresponsesofthestructurewithdampersreducegreatlyneartheresonantzone,butaccelerationisenlargedinthelowerorhigherfrequencyzone;amongvariousparameters,theinfluenceoffrictionalcoefficientnisthemostsignificant,thatofdampingratioofthedampers,isthesecond,andthatofstiffnesscoefficientofthedampersk,istheslightest.

简介：Aninnovativefloatingmooringsystemwithtwoormoreindependentfloatingmooringplatformsinthemiddleandonerigidplatformoneachsideisproposedforimprovingefficiencyandsafetyinshallowwater.Forthisnewsystem,mostofcollisionenergyisabsorbedthroughthedisplacementoffloatingplatforms.Inordertoillustratethevalidityofthesystem,aseriesofmodeltestswereconductedatascaleof1:40.Thecoupledmotioncharacteristicsofthefloatingmooringplatformswerediscussedunderregularandirregularwaves,andtheinfluencesofwavedirectionandothercharacteristicsondynamicresponseofthesystemwereanalyzed.Theresultsshowthatthemooringsystemissafestat0°ofwaveincidentangle,whereasthemostdangerousmooringstateoccursat90°ofwaveincidentangle.Motionresponsesincreasewiththeincreaseofwaveheight,butarenotlinearlyrelatedtochangesinwaveheight.

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简介：Inthispaper,asingle-columnstructureusedaswell-headplatformisstudied.Theloadsofwaveandcurrentexertedonthesingle-columnwillbegreatlyreduced,thereforethecostofthestructurewillbedecreased.Theadvantagesofthesingle-columnstructurecomparedwithordinaryjacketstructureareexplained.Adynamicanalysisofthistypeofstructureismadeandsomeproblemsrelatedtodynamicanalysisaresolved.Inordertocheckthereliabilityofcomputationtheoryandprogramme,modeltestshavebeencarriedout.However,asspaceislimited,theconclusionoftestswillbeintroducedinanotherpaper.Therefore,thistypeofstructureisapplicableforprocticalengineering.

简介：Inthispaper,thedynamicresponseofundersea-+towedsystemsisnumericallysimulated.Atwobodytowedsystemisespeciallyconsideredindetail.Thefactorsinfluencingtheheaveoftowed-bodies,suchastheweightofthetowed-body(inseawater),thelengthandtheweight(inseawater)perunitlengthofthecablebetweentowed-bodiesandtowingship,areinvestigatedindetail.Calculationsshowthatthetwo-bodytowedsystemcangreatlyincreasesthestabilityofthetowedsystem.

简介：Afullycoupled6-degree-of-freedomnonlineardynamicmodelispresentedtoanalyzethedynamicresponseofasemi-submersibleplatformwhichisequippedwiththedynamicpositioning(DP)system.Inthecontrolforcedesign,adynamicmodelofreferencelineardriftfrequencyinthehorizontalplaneisintroduced.Thedynamicsurfacecontrol(DSC)isusedtodesignacontrolstrategyfortheDP.Comparedwiththetraditionalback-steppingmethods,thedynamicsurfacecontrolcombinedwithradialbasisfunction(RBF)neuralnetworks(NNs)canavoiddifferentiatingintermediatevariablesrepeatedlyineverydesignstepduetotheintroductionofafirstorderfilter.LowfrequencymotionsobtainedfromtotalmotionsbyalowpassfilterarechosentobetheinputsfortheRBFNNswhichareusedtoapproximatethelowfrequencywaveforce.Consideringthepropellers’wearandtear,theeffectoffilteringfrequenciesforthecontrolforceisdiscussed.Basedonpowerconsumptionsandpositioningrequirements,theNNcentersaredetermined.Moreover,theRBFNNsusedtoapproximatethetotalwaveforcearebuilttomonitorthedisturbances.WiththeDPassistance,theresultsoffullycoupleddynamicresponsesimulationsaregiventoillustratetheeffectivenessoftheproposedcontrolstrategy.

简介：Forevaluationofthepermanentdeformationofaseaembankmentunderstochasticearthquakeexcitation,arobustdynamicriskanalyticalmethodispresentedbasedonconventionalpermanentdeformationanalysisandstochasticseismicresponseanalysis.Thismethodcanpredictnotonlythemeanvalueofmaximumpermanentdeformationbutalsothereliabilitycorrespondingtodifferentdeformationcontrolstandards.TheearthquakemotionismodelledasastationaryGaussianfilteredwhitenoiserandomprocess.Thepredictedaveragemaximumhorizontalpermanentdisplacementisinagreementwiththeconventionalresult.Furtherstudiedarethereliabilityofpermanentdeformationduetostochasticwavedetailsatoneseismicmotionlevelandtheriskofpermanentdeformationduetostochasticseismicstrength,i.e.,themaximumaccelerationinalongperiod.Therefore,itispossibletomaketheoptimaldesignintermsofsafetyandeconomyaccordingtotheimportanceofaseaembankment.Itissuggestedthattheimprovedstochasticseismicmodelthatcancatchthebehaviorofthenon-stationaryrandomprocessforseaembankmentsshouldbefurtherstudiedinfuture.

简介：—Effectivestressanalysisisperformedtoevaluatetheresidualdisplacementofacaissonquaywallduring1994Hokkaido-Toho-OkiEarthquakeand1993Kushiro-OkiEarthquake.Theconstitutivemodelusedinthisstudyisamultipleshearmechanismtypedefinedinstrainspaceandcantakeintoaccounttheeffectofrotationofprincipalstressaxis.Theearthquakeaccelerationsrecordedattheoutcroppingrockduringtheearthquakeareusedasinputbedrockmotion.Theresultsoffiniteele-mentanalysisareingoodagreementwiththeobservedbehaviourofthequaywall.Theanalysisalsoindi-catesthatliquefactionandhighexcessporewaterpressurehaveasignificanteffectonthedeformationofthecaisson.Soilimprovementisspeculatedasthemostreliablemeasuresagainstliquefaction.Theinflu-enceofsoilimprovementandthereasonableimprovedareaarediscussedinthepaper.

简介：Basedonunifiedequivalentharmonicloadingonseabedfoundationandenergyapproachsuggestedbytheauthors,thedevelopmentofdynamicporewaterpressureandstabilityofsoilfoundationforthevibrationofoceangravitystructuresexcitedbyrandomwaveloadingareanalysed.Itmaybeseenthatthepresentmethodforthestudyofdynamicproblemsofoceangravitystructuresoilfoundationsismorereasonableandconvenient.

简介：Anonlineardynamicanalysismodelisestabilishedonthebasisof"lumpedmass"approach,whichtakestheinfluenceofthefluidflowwithinthepipeintoconsideration.Numericalresultsarecomparedwiththepublishedworks,andtheeffectsofinternalfluidflow,internalpressure,dyanmicsaswellasthenonlinearcharacteristicsonthebehaviorofflexiblerisersarediscussed.Fromthiswork,someusefulconclusionsaredrawn.

简介：调查为随机的波浪是一个紧张腿平台(TLP)的联合反应。推断了，联合僵硬矩阵，抑制在颤动的矩阵是集体矩阵微分方程和在移动的TLP的外部负担坐标系统。无穷小的方法被使用把列和浮桥划分成小部分。时间领域运动方程被Runge-Kutta集成计划解决。Jonswap光谱在随机的波浪被模仿，电流被线性插值模仿，并且NPD光谱作为风光谱被使用。蒙特卡罗方法被用来模仿随机的波浪并且波动风。处于不同的海条件联合动态反应，腱紧张的变化和起床人紧张被力量分析光谱密度(PSD)。TLP和腱紧张的动态反应上的途径角度的影响被比较。

简介：Theimpactbucklingofalaminatedcompositebarisinvestigatedincaseofoneofitsendsmovingduetoaxialimpactcompression.Thegoverningequationsconsideringthefirst-ordersheardeformationeffectarederivedbytheHamiltonprincipleandsolvedbythefinitedifferencemethod.ThecriticalaxialshortnessisdeterminedbytheB-Rcirterion.Thegivenexampleisusedtohighlightthein-fluencesofinitialimperfection,impactvelocity,stresswaveandcoupledstiffness.Itisfoundthattheunsymmetricallylaminatedbarhasaquitedifferentdynamicbucklingbehaviourfromthatofthesymmetricallylaminatedbar.

简介：Thedynamicresponsesofoffshorefixedplatformsundericeloadsareanalysedinthispaper.Theresponsescalculatedincludethedisplacementandthehotspotstressesonthebasisofadynamicequationofice-inducedforcedvibrationforoffshorestructures.Theresultsobtainedcanbecitedandusedforthedesignandoperationofoffshorefixedplatformsagainsticeloading.

简介：Freakwaveisthecommonwavewhichhassignificantwaveheightandirregularwaveshape,anditiseasytodamageoffshorestructureextremely.TheFPSOs(FloatingProductionStorageandOffloading)sufferfromtheenvironmentloads,includingthefreakwave.Thefreakwavesweregeneratedbasedontheimprovedphasemodulationmodel,andthecouplingmodelofFPSO-SPM(SinglePointMooring)wasestablishedbyconsideringinternal-turretFPSOanditsmooringsystem.ThedynamicresponsecharacteristicsofbothFPSOandSPMaffectedbythefreakwavewereanalyzedinthetimedomain.Accordingtotheresults,thefreakwavesgeneratedbyoriginalphasemodulationmodelmainlyaffectthe2nd-orderwaveloads.However,thefreakwaveswhicharegeneratedbyrandomfrequenciesphasemodulationmodelaffectboth1st-orderand2nd-orderwaveloadsonFPSO.Whatismore,comparedwiththeirregularwaves,thedynamicresponsesofmooringsystemarelargerinthefreakwaves,butitsamplitudelagsbehindthepeakofthefreakwave.

简介：-Thedynamicresponsebehaviorsofuprightbreakwatersunderbrokenwaveimpactareanalysedbasedonthemass-damper-springdynamicsystemmodel.Theeffectsofthemass,damping,stiffness,naturalperiod,andimpulseduration(oroscillationperiod)onthetranslation,rotation,slidingforce,overturningmoment,andcorrespondingdynamicamplifyingfactorsarestudied.Itisconcludedthattheampli-yingfactorsonlydependontheratioofthesystemnaturalperiodtoimpulseduration(oroscillationperiod)underacertaindampingratio.Moreover,theequivalentstaticapproachtobreakwaterdesignisalsodiscussed.

简介：-Dynamicinteractioncharacteristicsofthemodeldeeplyembeddedplatformandfoundationsoilarestudiedbymeansofdynamicsubstructuringinterfacetransformationsynthesisanddynamiccondensation.Thetheoreticalanalysis,computerprogramsandpracticalexamplesarepresented;andtheresultsarecomparedwiththoseobtainedbystaticalcondensationmethodandfiniteelementmethod.

简介：Thisstudyhasfocusedondevelopingnumericalproceduresforthestaticanddynamicnonlinearanalysisofmooringlines.AgeometricallynonlinearfiniteelementmethodusingisoparametriccableelementwithtwonodesisbrieflypresentedonthebasisofthetotalLagrangianformulation.Thestaticanddynamicequilibriumequationsofmooringlinesareestablished.Anincremental-iterativemethodisusedtodeterminetheinitialstaticequilibriumstateofcablesystemsundertheactionofselfweights,buoyancyandcurrent.AlsotheNewmarkmethodisusedfordynamicnonlinearanalysisofoceancables.Numericalexamplesarepresentedtovalidatethepresentnumericalmethod,andexaminetheeffectofvariousparameters.

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简介：大旋涡模拟(LES)被用来调查形成对照的动态特征砍骚乱(圣)和在表面的兰米尔循环(LC)混合了层(SML)。圣被在SML强迫的风通常导致。LC能被包括强迫的风，波浪和旋涡的角色的波浪水流相互作用驾驶。LES结果证明LC压制水平速度并且极大地修改顺风的速度侧面，但是增加垂直速度。LC的强壮的downwelling喷气加速并且增加向下作为与圣塞相比精力搬运垂直旋涡粘性KL的m比混合的圣斯特朗的由LC导致的大得多有二个地点。他们位于2s3s(司烧深度规模)并且SML的更低的层分别地。它的价值和位置随着时间周期性地变化。相反，最大的K圣导致的m位于SML的中间的深度。LC产生的狂暴的动能(TKE)由在TKE和Km是明显的。因此，LC的parameterization不能完全基于TKE。为深SML，在LC的大规模旋涡的传送对流起一个主要作用在向下，精力和LC的运输能导致更强壮的速度砍(SML底附近的S2)。另外，LC导致的大规模旋涡和S2总是正在变化，它需要充分在LC的parameterization被考虑。

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