The Design And Research On The Elastic Mooring System Of Floating Tidal Current Power Station

“Marine power" is a great step forward in realization. It means a country has the abilityof exploring ocean, utilizing marine resources, and developing a comprehensive navalpower. The ocean is rich in renewable energy, and tidal current has captured many researchattentions for the advantages of its harness. Floating type tide power station, as an effectivesystem of ocean energy development and utilization, is getting more and more attention.And a satisfied anchorage system design, which could meet the demand of positioning aswell as light weight and avoid plant capsizing, plays an important role in the developmentof tidal current power station and human’s exploring acticities.The main task in this paper is the design and research of mooring system of aninstalled capacity of2X300kW floating tidal current power station，which is supported by“The National Ocean Special Funds” program. Besides, the plant power is increasing; theterrain of decorating area is becoming more complex, as a result, the design of mooringsystem becomes more complicated. the design of safe and economical mooring system isbecoming more urgent. Affected by this trend, mooring line is also changing from singlecomposition to multiple compositions. And at the same time, mooring line material typesare also becoming more diverse, which provides the mooring design more choices. In orderto make the design of floating tidal current power station mooring system meeting thedesign requirements, it is necessary to introduce a new type of nonlinear elastic stretchingmaterial which consists of line elastic stretch material and chain. The main works in thispaper are as follows:Firstly, in order to have a further understanding of this kind of material and providetheoretical reference for future use, exploratory research about the application of staticmooring line numerical simulation in nonlinear elastic stretch material of mooring system.Secondly, the hydrodynamic analysis of floating tide power station is conducted byusing of commercial software AQWA. AQWA-LINE module are used to calculate thefloating body structure motion in regular wave response, which mainly adopts threedimensional linear wave theory, and we’ll get hydrodynamic response, average secondorder wave force, and hydrodynamic coefficient of floating type tidal power stations in theregular wave, and calculate the carrier RAO of the six freedom degrees movement, added mass of floating body and radiation damping, etc. Then we will provide the necessarycalculation data, analysis and research about layout angle of the mooring line, which canprepare for the mooring system design work.Finally, this paper will analyze the environment load of floating tide power station,combine with practical engineering, refer to specification requirements, add nonlinearelastic rope, and conduct time domain computation for the mooring system of floating tidepower station by AQWA software. At the same time, it is necessary to provide the feasibilityof mooring system design scheme of tide power stations and check it. After comparing withwhole chain mooring system solutions, we’ll verify the superiority of linear elastic rope inmooring system.