Research On The Design And Optimazition Based On The High Speed Displacement Transom Stern Ship Form Lines

With the development of science and technology, "Time is efficiency " is already the undisputable fact,People request a gradual exaltation the speed of various transportation tools.The highways are built everywhere,the railroad transport repeatedly lifts its speed,the public aviation develops faster and faster. These are stronger proofs.On this condition,people can decrease their invalid time for moving around,and at the same time,the time of goods operation will be shortened.So the ship transport faces big pressure,for the sake of orientation market of demand,improving the speed is inevitable trend. As the high-speed ship is becoming larger and larger,the ship's opposite speed descends,the high speed ship develops quickly and the high speed transom stem ship is used more and more extensive.so this dissertation chose the high speed transom stern ship as research object matches a social development.This essay is divided into six chapters,chapter one is introduction, it introduces the dissertation's research direction and the research results in domestic and international,and then introduces the contents of full text.In chapter two, after reading many references about the high speed displacement ship,draw the good experiences from the mathematics ship form.find a kind of mathematics equation which can describe the high-speed displacement transom stem ship lines,it can automatically design many kinds of ship lines through control some parameters.at last I make a conclusion to the hydrodynamic performance about transom stem.it's meaningful to the ship hydrodynamic performance calculation and theory research.In chapter three,Taking the advantage of Michell integral to build up the model of ship resistance based on the flow theory, Making a comparison to Wigley ship form by my calculation program,and the result is tally with the experiment data. Then I express the NPL Model 100A and calculate the wave-making resistance by using the method of this text,the calculation of friction resistance and form resistance use the ITTC fomula in 1957 and 1+k method,and then we can get the total resistance.At last I sum up the effect about the parameter values to ship resistance. In chapter four,Using the sequential quadratic programming method(SQP )to optimize my ship lines by taking the total resistance per dispalcement as object function and keeping the variety of displacement in the certain scope(like 1%),It can get the best optimazition parameters values,we can get some good conclusion after cmoparisoning with the origin ship form.In chapter five,making the multi object optimazition based on genetic algorithm In multi object optimazition,we get some non-inferior solution and meaningful conclusions, this is good for the development of ship design.Chapter six is conclusion,I make a conclusion about this dissertation, at the same time point out the shortage and place that need to be improved.