A Consideration on Nonlinear Component of Maneuvering Hydrodynamic Force from Segmented Model Test Results

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  • 分割模型試験による操縦流体力の非線形成分の検討
  • ブンカツ モケイ シケン ニ ヨル ソウジュウリュウ タイリョク ノ ヒセンケイ セイブン ノ ケントウ

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In order to clarify availability of the so-called cross-flow model, some model experiments on hull hydrodynamic derivatives due to drift angle have been carried out with segmented models. The lateral forces on each of the segments were measured for various ship hulls including a flat plate. Here, it is assumed that lateral force on each segment can be expressed by a formula consisting of linear and second order terms. The linear and nonlinear derivatives are determined from the curve-fitting by a least-squares method. This report gives experimental results of the distribution of the nonlinear lateral force component over the ship's length. A comparison is made between local values of second order derivatives and cross-flow dlag coefficients at a drift angle of 90°. As a result, it is indicated that a ratio of the two values is a function of the longitudinal location. Moreover, distribution of the ratio is greatly dependent on the ship's hull form. In predicting the nonlinear derivative with sufficient accuracy, the cross-flow drag coefficients for 90°drifting should be corrected when s ship moves obliquely. Development of prediction procedure of the correction factor is left as a futule problem.

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