The rudder force, including interference with a ship hull in large drifting conditions, is investigated in this study by captive model tests using a ship model with steering. In the tests, hydrodynamic forces acting on the ship, the rudder normal force, and propeller thrust are measured while changing the hull drift angle \(\beta \) in the range of \(-180^{\circ } \sim 180^{\circ }\), which encompasses forward, lateral, and astern motion. The hull and rudder interaction coefficients, thrust deduction factor, inflow velocity to propeller, and inflow velocity to rudder are obtained in large drifting conditions using the measured hydrodynamic force data. The Maneuvering Model Group (MMG) model (Yasukawa and Yoshimura, 2015) is applicable for estimating the rudder force when the absolute value of \(\beta \) is smaller than \(45^\circ \). In this region, the hydrodynamic force parameters for the inflow velocity to the rudder are nearly constant for any hull drift angle. However, in the region where the absolute value of \(\beta \) is greater than nearly \(45^\circ \), the MMG model cannot be applied. For improving the formula for the longitudinal inflow velocity component to the rudder (\(u_R\)), we propose a new formula that is applicable to any hull drift angle.

在这项研究中，通过使用带有转向的船舶模型的俘获模型测试，研究了舵力，包括在大漂移条件下对船体的干扰。在测试中，测量船体上的水动力，方向舵法向力和螺旋桨推力，同时在\（-180 ^ {\ circ} \ sim 180 ^范围内更改船体漂移角\（\ beta \）{\ circ} \），包括向前，向后和向后运动。使用测得的水动力数据，可以在较大的漂移条件下获得船体与舵的相互作用系数，推力减小因子，螺旋桨的流入速度和舵的流入速度。当\（\ beta \）的绝对值小于\（45 ^ \ circ \）时，机动模型组（MMG）模型（Yasukawa和Yoshimura，2015）适用于估算方向舵力。在该区域中，对于任何船体漂移角来说，流入舵的速度的水动力参数几乎是恒定的。但是，在\（\ beta \）的绝对值几乎大于\（45 ^ \ circ \）的区域中，则无法应用MMG模型。为了改进方向舵的纵向流入速度分量的公式（\（u_R \）），我们提出了适用于任何船体漂移角的新公式。