简介:Foralargefloatingvesselinwaves,radiationdampingisnotanaccuratepredictionofthedegreeofrollunlikeotherdegreesoffreedommotion.Therefore,togettheknowledgeofrollmotionperformanceofdeepwaterpipelaycranevesselsandtokeepthevesselworkingsafety,thepaperpresentstherelationshipbetweenaseriesofdimensionlessrolldampingcoefficientsandtherollresponseamplitudeoperator(RAO).Byusingtwokindsofempiricaldata,therolldampingisestimatedinthecalculationflow.Aftergettingtherolldampingcoefficientfromthemodeltest,apredictionofrollmotioninregularwavesisevaluated.Accordingtothewaveconditionintheworkingregion,shorttermstatisticsofrollmotionarepresentedunderdifferentwaveparameters.Moreover,therelationshipbetweenthemaximalrollresponseleveltopeakspectralwaveperiodandtherolldampingcoefficientisinvestigated.Resultsmayprovidesomereferencetodesignandimprovethiskindofvessel.
简介:摘要:海底管道铺施工过程中,可能会遇到不同风险和应急事件,其中海管屈曲情况的发生对管线铺设会造成很大风险和影响。本文以锦州25-1油田12inch/18inch双层海管海上安装施工为基础,简单介绍了海底管道在施工过程中如何辨别分析出管线发生了屈曲状况,在不同的屈曲状况下, 如何采取恰当的措施进行应急处理。
简介:摘要随着国民经济的发展,在取水、深海排放、海上油气开采运输等很多的领域都运用到管道,本文通过我几十年的施工经验,对管道在滩涂和浅水区运用漂浮法施工方法进行了总结,以便在今后类似工程中下更好地推广运用。