简介：Quartercircularbreakwater(QCB)isanew-typebreakwaterdevelopedfromsemi-circularbreakwater(SCB).ThesuperstructureofQCBiscomposedofaquartercircularfrontwall,ahorizontalbaseslabandaverticalrearwall.ThewidthofQCB'sbaseslabisabouthalfthatofSCB,whichmakesQCBsuitabletobeusedonrelativelyfirmsoilfoundation.ThenumericalwaveflumebasedontheReynoldsaveragedNavier-StokesequationsforimpressibleviscosityfluidisadoptedinthispapertosimulatethehydraulicperformancesofQCB.SincethegeometryofbothbreakwatersissimilarandSCBhasbeenstudiedindepth,thehydraulicperformancesofQCBaregivenincomparisonwiththoseofSCB.

简介：这份报纸描述系统与一只反的摆钟在波浪精力变换器(WEC)采用了的双击的代理水力的力量起飞(PTO)。水力的PTO把慢不规则的互给波浪运动变换成一个电的发电机的相对光滑的、快旋转。水力的PTO系统和它的控制的设计是批评的最大化产生力量。时间领域模拟研究和照原尺寸的沙滩测试的实验室实验被介绍。包括他们的比较在的模拟和实验室实验的结果照原尺寸也被介绍，它与双击的代理水力的PTO系统与一只反的摆钟验证了设计的合理性和WEC的原型的一些关键部件的可靠性。

简介：-Thispapercarriesouttheanalysisofmechanicsofagripsystemofthree-key-boardhydraulictongsdevelopedforoffshoreoilpipelineswhichhasbeensuccessfullyusedinoilfieldsinChina.Themainimprovementofthissystemisthataleverframestructureisusedinthestructuraldesign,whichreducesgreatlythestressesofthemajorcomponentsoftheoilpipetongs.Theoreticalanalysisandnumericalcalcu-lationbasedonthirteenbasicequationsdevelopedshowthattheteethboardofthetongsisnoteasytoslipasfrequentlyhappenstoothersystemsandisofhigherreliability.