船舶風圧力簡易推定プログラムについて

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A simple estimation program for estimating wind load coefficients of ships is developed. Input parameters are only ship length and breadth if available together with the information concerning ship type and its loading condition, full load or ballast. This program consists of two steps. At first step, six or seven input parameters among eight input parameters of the original calculation method for wind load coefficients that had been developed by authors are estimated. On the second step, wind load coefficients are calculated by the original method using input and estimated parameters. Then the topic of this simple estimation program is mainly in the first step. Based on 76 ships data, the input parameters to the original calculation method for wind load coefficients are analyzed. The input parameters to be estimated are side area overall, side area of super-structure, front area, position of side area center from midship, height of side area center, height of bridge top and breadth if it is unknown. These input parameters are expressed in the regression formulae for each type and condition of ships in which variables are ship length and breadth if it is available. Selective ship types and conditions are nine ; tanker full load, tanker ballast, bulk carrier full load, bulk carrier ballast, LNG full load, LNG ballast, container ship full load, passenger ship and others. Comparison between the results of the simple estimation program and of the experiments is provided for nine ship types and conditions. Errors in estimated input parameters and wind load coefficients are discussed. Difference between estimated results using ship length only and that using both ship length and breadth are also discussed. It is confirmed that the simple estimation program is reliable and useful in estimating wind load coefficients if information about a ship shape or ship dimensions are limited.
独立行政法人海上技術安全研究所の論文
2009-12-25

船舶風圧力簡易推定プログラムについて

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