简介:铁路建设项目具有综合性强、关联性大等特点,对其涉及到的各利益相关者进行分类研究显得格外重要。结合文献研究和问卷调查法,利用SPSS统计软件,基于权益性、权力性和紧要性3个维度辨识出10类主要利益相关者。根据项目利益群体间的关系行为与原子运行趋势具有相似性的思想,通过建立铁路建设项目利益相关者的三维原子图谱模型,将10类主要利益相关者分为核心层、电子层和外核层的利益相关者。分析得出:不同层级的利益相关者之间存在忠诚和协调的纽带;具体表现为4种关系:协同、向心、跃级和集群关系;四者彼此联系,相互依存;原子图谱结构通过核心层利益相关者的带动,以及4种网络结构关系的拓展,最终实现项目建设的自主性和适应性。研究成果能为建设指挥部制定正确经营战略提供新的理论支持。
简介:随着国民经济的发展、铁路建设进程的加快,以改革创新办法,鼓励引导社会资本投入铁路建设,是提升铁路可持续发展的有效途径。此文在阐述我国铁路建设面临新形势,路网规模逐年增加、运营维护和管理任务繁重的基础上,就采用“投融资+EPC+运营维管”模式建设和运管铁路进行探讨。通过探讨,提出可实施的框架方案,以及实施的保障措施。
简介:Sloshingphenomenonintheliquidcargocarriershascaughttheattentionofresearchersastheinteractionbetweenthesloshingwavesandstructureisoneofthekeypointanddifficultyinthestudyofsloshing.Inthispaper,wecapturedthefreesurfacewithavolumeoffluid(VOF)methodandthencalculatedthemotionsandresponsesofthestructurebyadoptingtheReynolds-averagedNavier-Stokes(RANS)equationsforthewholefluiddomain.Withtheuseofuserdefinedfunctions(UDF)inFluent,theinteractionbetweenfluidandstructurewasthensimulated.Asareasonablesimplification,theauthorsstudiedtheresponseofasinglecantileverinatankundersloshingloads;Furtherstudyshouldpaymoreattentiontothemechanismsofinteractionbetweensloshingwavesandelasticstructures.
简介:Inordertostudycavitationcharacteristicsofa2-Dhydrofoil,themethodthatcombinesnonlinearcavitationmodelandmixed-iterationisusedtopredictandanalyzethecavitationperformanceofhydrofoils.ThecavitationelementsarenonlinearlydisposedbasedontheGreenformulaandperturbationpotentialpanelmethod.Atthesametime,themethodthatcombinescavityshapeforfixedcavitylength(CSCL)iterationandcavityshapeforfixedcavitationnumber(CSCN)iterationisusedtoworkoutthethicknessandlengthofhydrofoilcavitations.Throughanalysisofcalculationresults,itcanbeconcludedthatthejumpofpressureandvelocitypotentiallyexistbetweencavitationendareaandnon-cavitationsareaonsuctionsurfacewhencavitationoccursonhydrofoil.Incertainanglesofattack,thecavitationnumberhasanegativeimpactonthelengthofcavitations.Andunderthesameangleofattackandcavitationnumber,thebiggerthethicknessofthehydrofoil,theshorterthecavitationslength.
简介:单点系泊系统作为浮式生产储油卸油装置(FloatingProductionStorageandOffloading,FPSO)的核心组成部分,需在FPSO进入安装现场之前完成安装,随后FPSO进入安装现场进行回接。以我国南海某具体工程项目为背景,全面、系统地介绍FPSO悬链腿单点系泊系统的安装及回接方法,并采用OrcaFlex分析软件对各个施工步骤进行相关的模拟分析。该单点系泊系统的整个安装过程可分为抓地锚安装、下段锚腿铺设、锚腿张紧、上段锚腿铺设、单点浮筒拖航及就位和锚系回接单点浮筒等6个阶段。
简介:Windpowerhasmaderapidprogressandshouldgainsignificanceasanenergyresource,givengrowinginterestinrenewableenergyandcleanenergy.Offshorewindenergyresourceshaveattractedsignificantattention,as,comparedwithland-basedwindenergyresources,offshorewindenergyresourcesaremorepromisingcandidatesfordevelopment.Seawindsaregenerallystrongerandmorereliableandwithimprovementsintechnology,theseahasbecomeahotspotfornewdesignsandinstallationmethodsforwindturbines.Inthepresentpaper,basedonexperiencebuildingoffshorewindfarms,recommendedfoundationstyleshavebeenexamined.Furthermore,waveeffectshavebeeninvestigated.Thesplitinstallationandoverallinstallationhavebeenillustrated.Methodsappropriatewheninstallingasmallnumberofturbinesaswellasthoseusefulwheninstallinglargenumbersofturbineswereanalyzed.Thisinvestigationofinstallationmethodsforwindturbinesshouldprovidepracticaltechnicalguidancefortheirinstallation.