Study On Digitization And Automatic Generation Of Line

Nowadays, with the appearance of lots of numerical control equipments and development of information technology ,there are many important changes in model of shipbuilding, a remarkable one is that exchange of data for shipbuilding becomes mor and more frequently and the amount of data for exchange also increases rapidly. At the same time ,more and more digital information is required to be numbered , And then ,it is digital information that is transmitted between numerical control equipment , this model bring about remarkable increasment of productivity. The design model of ship is required to adjust for the change of the manufacturing model . By the occasion , it is required to number the hull , which convenient for the distinguish to numerical control equipment . Meanwhile , it is required to provide a unblocked channel of communication for the data transmission.Beacauses of numbering the hull , it is bring about the emergence of the mathematical-hull. It is defined the mathematical ship hull to use mathematical function in designing hull lines. We must figure out some practicable equations to calculate the hull lines that should be smoothness and fit the real ship lines. These data, which are already exanimated, can be the original data of fluid dynamic calculation and the original data of ship-manufacture. Numbering the hull convenient for the shipbuilding , as well as for ship-design itself.In this thesis, the practical effect and the development of hull line design are analyzed. It offers the idea according to problem faced, considering the good character of the ends,the ajusted cubic B-spline curve is used to fit ship lines.it finds out the control vertexs according to a sequence of given points,and then, through particular formula, each point in the curve could be worked out. It smoothes lines with the method based on small-paramter. Through interpolation we can calculate every point of a ship or create a line wherever in the lines plan due to given paramater.In order to inquire and output data conveniently , this thesis also offers the data interface which can obtain original data from preceding module . After smoothness and interpolation,the moulded-values-table could be expanded.the changed table could be saved in a data file.And then , the data Data Base Management program can manage the data including interpolation and query without AutoCAD, the data could be offerred to the equipments according to the demand of manufacture .It uses objectARX tools based on C++ language in AutoCAD 2002 flat to make a farther development .It worked out a corresponding soft ware , and drew the planes of a real ship , has obtained a good effect.