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首页> 外文期刊>日本造船学会论文集 >中速商船・漁船船型の操縦流体カデータベースと操縦運動の一推定法
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中速商船・漁船船型の操縦流体カデータベースと操縦運動の一推定法

机译:用于中速商业和渔船的操纵液的数据库以及操纵运动的估计方法。

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Manoeuvring prediction is indispensable for the designing stage of ship. It becomes a serious concern that the manoeuvring performance complies with the IMO standard. For medium speed merchant ships such as container ship and PCC, they have the tendency that the advance and tactical diameter become larger by the course-keeping quality too stable, and have a possibility not to comply with the standard. Particularly, at the ballast condition with large trim by the stern, the above tendency becomes stronger. As for fishing vessels, C_b is around 0.6 that is similar to the above merchant ships because of the high Froude number, and has an initial trim in addition to the conventional baseline trim. It becomes very important to precisely evaluate the manoeuvring hydrodynamic forces against the trim.rnBased on the above background, the authors have made the database of manoeuvring hydrodynamic coefficients for medium speed merchant ship and fishing vessels with one propeller and one rudder system. Then, the regression models which properly presume hydrodynamic coefficients are introduced based on this database.rnThe concluding remarks are summarized below.rn1. The linear hydrodynamic derivatives of hull can be well predicted even in the large trimmed condition by correcting Kijima's model that had been predicting a turning circle excessively large.rn2. The interactive coefficients which have been modeled as functions of principal dimensions of ship are not so affected by them. Particularly, k_x, x'h and l'r can be modeled as almost constant, a_H and γR are slightly affected by the parameter C_b/(L/B), however the effects are too smaller than conventional models.rn3. Using the presented new regression models, turning motion and z-manoeuvr are simulated and compared with conventional Kijima's model. As the result, the prediction errors can be reduced to 1/2-1/3 of conventional model.%船舶の操縦性能の推定に関して、タンカー、バラ積み船など大型肥大船型を対象とした操縦性能の推定方法の研究は数多いが、コンテナ船やPCC、フェリーといった船型を対象とした操縦性能推定法の研究は数少ない。こうした船は、フルード数が高いことからC_bゎが0.6前後とやせており、針路安定性が良好で、Z試験のオーバーシュートの操縦性基準にほとんど抵触しないことによると考えられる。
机译:操纵预测对于船舶的设计阶段是必不可少的。操纵性能符合IMO标准已成为一个严重的问题。对于诸如集装箱船和PCC的中速商船,由于航向质量太稳定,它们具有前进和战术直径变大的趋势,并且有可能不符合该标准。特别是,在船尾的纵倾大的压载状态下,上述趋势变强。对于渔船,C_b约为0.6,这与上面的商船相似,因为弗洛德数高,并且除了常规基线修剪外,还具有初始修剪。基于上述背景,作者建立了具有一台螺旋桨和一台舵系统的中速商船和渔船的机动水动力系数数据库。然后,在此数据库的基础上,引入了适当设定水动力系数的回归模型。rn总结如下。即使是在较大的修整状态下,通过校正先前预测转弯圆弧过大的基希马模型,也可以很好地预测船体的线性流体动力导数。建模为船舶主要尺寸函数的交互系数不受它们的影响。特别是,可以将k_x,x'h和l'r建模为几乎恒定,而a_H和γR受参数C_b /(L / B)的影响很小,但是效果比常规模型小。使用提出的新回归模型,可以模拟转弯运动和z-manoeuvr并将其与传统的Kijima模型进行比较。结果,可以将预测误差减少到传统模型的1 / 2-1 /3。%船舶の操縦性能の推定に关して,研究は数多いが,コンテナ船やPCC,フェリーといった船型を対象とした操縦性能推定法の研究は数少ない。こうした船は,フルード数が高いことからC_bゎが0.6前后とやせており,针路安定性が良好で,Z试験のオーバーシュートーの操縦性基准にほとんど抵抗触しないことによると考えられる。

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