分割模型試験による操縦流体力の非線形成分の検討

—浅水状態の場合—

抄録

This report presents some experimental results of maneuvering hydrodynamic forces obtained from segmented model tests at finite water depth. The experiments were carried out in order to make clear the shallow water effect on distribution of the nonlinear lateral force component over ship’s length. Here, it is assumed that the lateral force on each segment can be expressed by a formula consisting of linear and second order terms. From the experimental results, it was examined that to what degree the second order derivatives correspond to the cross-flow drag coefficients in condition of finite water depth. A ratio of the nonlinear derivative to the cross-flow drag coefficient is introduced for each segment of the ship hull. As a result, it is pointed that difference in the ratio distribution due to water depth is large in neighborhood of the ship model bow. Furthermore, it is indicated that the value of the ratio for the total model increases with decrement of the water depth.