简介:Foralargefloatingvesselinwaves,radiationdampingisnotanaccuratepredictionofthedegreeofrollunlikeotherdegreesoffreedommotion.Therefore,togettheknowledgeofrollmotionperformanceofdeepwaterpipelaycranevesselsandtokeepthevesselworkingsafety,thepaperpresentstherelationshipbetweenaseriesofdimensionlessrolldampingcoefficientsandtherollresponseamplitudeoperator(RAO).Byusingtwokindsofempiricaldata,therolldampingisestimatedinthecalculationflow.Aftergettingtherolldampingcoefficientfromthemodeltest,apredictionofrollmotioninregularwavesisevaluated.Accordingtothewaveconditionintheworkingregion,shorttermstatisticsofrollmotionarepresentedunderdifferentwaveparameters.Moreover,therelationshipbetweenthemaximalrollresponseleveltopeakspectralwaveperiodandtherolldampingcoefficientisinvestigated.Resultsmayprovidesomereferencetodesignandimprovethiskindofvessel.
简介:我陪同科长出差到了某地。一下火车,科长说,今天没什么事,我这儿有位多年未见的朋友,咱联系一下,解决今天的晚饭问题。电话通了,科长高声说:"兄弟,我想死你了!十多年没见啊……我在哪儿?我现在就在你的地盘上……本来下午要和接待方见面商谈的,晚饭也给安排好了,但因急于见你,全部取消,有什么事明天再说,今晚全心全意陪你。"
简介:今天,闲来无事,心情尚好,趁着这放学工夫,想到河边走走.我是这条小河的常客.我站在河边,凝视着河面.眼前的河面,静静的,就像一面平铺的明镜,把我的影子清晰地倒映在河面上,而河岸边的草们、树们,以及远处的山们,它们的倩影也都倒映在这平坦的河面上,真是一幅绝妙的水墨画呀.我已经被这幅水墨画深深地吸引住了.这时,从远处飞来几只小鸟,它们快速地从水面上掠过,明澈的河水及时地按下了快门,映出了它们轻快灵动的身影.它们那样欢快地拍打着翅膀,仿佛是在与水中的鱼儿们追逐、嬉戏.啊,确实太美了,美得真的难以形容.