定加速度の斜航実験による付加質量m_x,m_yの測定

抄録

The knowledge of added masses m_x and m_y is important to estimate not only ship's accelerating motions but also unstable yaw-moment (m_x-m_y)・u・v called as Munk-moment. In order to estimate the added masses of a ship, "Motora-charts" estimating the added masses are available for ships with usual forms. But they may not give the suitable estimation for other ships with unusual forms, for example small fishing boat or pontoon with rectangular. In order to measure the added masses m_x and m_y of these unusual ships in steering motion by experiments, this paper developed the experimental and analysing techniques of the oblique towing-test with constant acceleration for a ship -model. As the results, it becomes easy to measure at once both of two directional added masses m_x and m_y one oblique-twing test with one drift angle.