旋回運動時の操縦流体力推定法に関する研究

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For predicting ship manoeuvring performance, it will be very important to estimate the hydrodynamic forces acting on a ship with high accuracy. The hydrodynamic forces can be estimated by the approximate formula as a function of principal particulars of the ship. However, it will be not able to estimate the hydrodynamic forces considering the detail hull form such as a frame line by using this prediction method. Therefore it is necessary to establish the prediction method which can be took into the effect of difference of frame line configuration in order to estimate the hydrodynamic forces more accurately. We examined the hydrodynamic forces acting on a ship hull in oblique motion considering the frame line configuration by using the prediction method which was based on slender body theory in previous paper. As a result of the comparison between the estimated hydrodynamic forces and the measured hydrodynamic forces, we got a comparatively good agreement. But there will be necessity for examining the hydrodynamic forces acting on a ship hull in turning motion similarly to discriminate the course stability of ships. In this paper, we investigated the hydrodynamic forces acting on three types of model ships which were a VLCC with V type-frame aft part, a VLCC with U type-frame aft part and a VLCC with just middle frame line configuration between V type and U type. We combined vortex model with slender body theory and shed the dispersive vortex lines freely. Furthermore, we defined the parameter "s" which represented the initial location of vortex line and examined on the relation between the manoeuvring motion of ships and the value of the parameter "s" to estimate the hydrodynamic forces acting on a ship hull in manoeuvring motion with high accuracy. From the results of numerical calculation in the proposed method, we got the following concluding remarks. As a result of the comparison between the estimated hydrodynamic forces and the measured hydrodynamic forces, we got a good agreement in these results. Furthermore, it is considered that it will be able to discriminate the course stability of ships taking into the frame line configuration with high accuracy by using the present method.
社団法人日本船舶海洋工学会の論文
1996-09-04

旋回運動時の操縦流体力推定法に関する研究

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