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Research of Seakeeping Assessment Models of Ship Schematic Design Phase

Author: WangYin
Tutor: DingYong
School: Harbin Engineering University
Course: Design and manufacture of ships and marine structures
Keywords: surface vessel schematic design phase seakeeping multiple stepwise regressionanalysis
CLC: U661.32
Type: Master's thesis
Year: 2012
Downloads: 114
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Abstract


Ship seakeeping is an important indicator in measuring the design performance of naval vessel, The good designation of ship seakeeping not only can protect the safety of the ship, but also can brings large economic benefits for the ship’s operations. In the top-level design and Schematic Design Phase, together with determining the ship power, we can make the ship seakeeping to join in the ship principal dimensions and form coefficients. After determining the ship and its parameters, we can guarantee achieved the ship seakeeping indicator at the primary stage. In the later design stage, even if the ship needs to make the necessary changes, it can guarantee the seakeeping indicators have no large change. Thus, this paper researchs the seakeeping calculation method in the top-level demonstration and schematic design phase,According to the analysis of the ship hull form and main ship parameters,which have effect on ships heaving pitching, rolling, swaying,yawing and the vertical acceleration of the head and the tail, to determine all the ship factors in the seakeeping prediction model. Through the analysis and comparison of different seakeeping model, this paper use the method which is similar withbales and moors used to building the seakeeping prediction model.Making the displacement remain unchanged in the optimization process, through changing the parameters of the captain and shape to achieve the transformation of the ship, and through adjusting the design parameters of designed draft to compensate for the changes of drainage by the changes of the ship. This paper uses FORTRAN programming language to achieve the program of the ship changes, and makes a series of ship conversion to obtain the series ship type. Then, accomplishing the seakeeping calculations for the ship samples in the sample library by the ship seakeeping program based on the strip theory, and getting the amplitude-frequency response of the different ship size and the ship’s main parameters in regular waves, and its sway motion displacement, the vertical acceleration at the ship’head and tail in irregular waves. At last,this paper makes a collectiong for the existing ship’s seakeeping data, and build the database in the certain format.Based on the seakeeping database, this paper initially establishes the simple algebraic equation of ships heaving, pitching, rolling, swaying,yawing and the vertical acceleration of the head and the tail.Then, using the stepwise regression method in multiple regression analysis to achieve the adding and removing of the variables, and getting regression model which has a good significance. The model can forecast the movement and acceleration statistics in irregular waves for design ships, which are particular ship within the parameters and similar with the mother ship of similar, and the results can better meet the accuracy requirements. Thus, ship seakeeping performance design is meaningful in the ship schematic design stage.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship dynamics > Seaworthiness ( seakeeping )
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