Hydrodynamic Analysis Of Anisotropic Very Large Floating Structure

The research of Very Large Floating Structure(VLFS) started at the end of 80s last century. The first international conference about VLFS was hold in Hawaii of USA at 1991. After that some papers were published. The research about VLFS plays an important role in ITTC and ISSC at present. More than 100 papers will be published all over the world every year. In our country, the first man who brought into contact with this concept is Mr. Wu Yousheng. Moreover, he sent two Doctor, Wang Dayun and Du Shuangxing, to work with researcher of other country using 3-D Hydroelasticity Theory.The VLFS has three ways of using: as a scientific base; solving the lacking of land; as a martial base.There are two methods of research about VLFS, direct method and analytical method of mode. Method of mode was used in most of research. The computation of frequency is important as using this method. In later years, the direct method was used gradually. The main developing trend of research about VLFS contains four parts: responses in complicated environment of ocean; enhance the efficiency of computation; influence of non-linear; simple method of estimating about capability.In my research, direct method was used. I assumed a composite material rectangle model as my studying object, with 1000 meters long and 500 meters wide. It is divided into 625 smaller rectangles. Then I dispose fountainhead in each rectangle. The computation of intensity is using the method of Green function; The computation of the structure was using Finite Element Method. 4-nodes parameter element was used in each structural element. After that, I add hydro-coefficients to the matrix of the structure to compute the displacement.There are many deficient points in my thesis, such as the precision of computation, the coupling method between liquid and solid, and so on. All of them can be improved in my further research.