简介:Inthispaper,a3Dsourcedistributiontechniqueisusedtocalculatethecoupledmotionsbetweentwoshipswhichadvanceinthewavewiththesamespeed.Thenumericalresultsofcoupledmotionsforafrigateandasupplyshiphaveagoodagreementwiththeexperimentalresults.Basedonthe3Dcoupledmotionsoftwoships,aspectralanalysisisemployedtoclearlyobservetheeffectofspeed,clearanceandwaveheadingonthesignificantrelativemotionamplitude(SRMA)oftwoships.Themethodpresentedinthispaperwillbehelpfultoselectsuitableclearance,speedandwaveheadingforunderwayreplenishmentatsea(RAS).
简介:我国电动自行车从20世纪90年代末发展到今天,已有20余年的历程。作为我国自主研发的产品,电动自行车为人民生活和国民经济做出了重大贡献,不仅较好地解决了百姓交通出行难题,还在城镇化建设中发挥了积极作用,取得了举世瞩目的成绩。在“十三五”开局之年,中国自行车协会就用“创下了10个‘首次’”来彰显电动自行车行业过去几年取得的成绩。20年来,电动自行车行业规模、产值、年产量、出口量、出口额、社会保有量、技术进步等10个方面,都较初期有了惊人的提高,并纷纷创下历史性突破。如今,我国已牢牢坐稳电动自行车第一大国位置,行业年产量以及企业的规模和数量也在世界上拥有较大优势。
简介:介绍了东凤4D型系列内燃机车,包括客运内燃机车、货运内燃机车和准高速客运内燃机车的开发与研制情况、主要结构及技术创新内容与特点.
简介:Removalofcondensatesfromwetsteamflowinthelaststagesofsteamturbinessignificantlypromotesstageefficiencyandpreventserosionofrotors.Inthispaper,homogeneousspontaneouscondensationintransonicsteamflowinthe2-Drotor-tipsectionofastageturbineisinvestigated.Calculatedresultsagreewithexperimentaldatareasonablywell.Onthebasisoftheabovework,a2-Dnumericalsimulationofwetsteamflowinadjacentrootsectionsofacomplexsteamturbinestagewascarriedout.Computationalresultswereanalyzedandprovideinsightsintoeffectiveremovalofhumidity.