停止時の船に働く定常波力に関する模型実験

概要

論文の詳細を見る
Steady wave forces and moment at rest are important to estimate drifting motion of a ship in waves or to estimate manoeuvrability of a ship in waves at low speed. However, it is difficult to measure these kinds of forces and moment without disturbing six degrees of ship motions in waves. Restraining free ship motions during measurement distorts property of steady wave forces and moment. That is one of reasons why not so many experimental data consisting of surge and sway forces and yaw moment have been reported so far. Experiment for measuring steady wave forces and moment at zero forward speed are carried out using a newly developed measuring system. This measuring system uses three torque motors which play two roles, one is as weak springs to produce restoring forces for surge, sway and yaw motion and the other is as counter weight for balancing steady wave forces and moment. Using this mechanism, one can easily attenuate spring constants and counter forces and moment by setting continuous electrical signal and make a model ship remain in designated area during measurement without much affecting six degrees of free ship motions of wave period. Calculations based on 3-D panel method and Strip method are provided for evaluating experimental data including ship motion of wave period and steady wave forces and moment. Calculated values for ship motions well describe experimental data. Therefore this measuring system is considered not to restrain model ship motions of wave period during measurement. One of calculations for surge and sway forces shows fairly good agreement with experimental data. Some discussions about differences between experimental data and calculations for yaw moment and also about reliability of experimental data for steady wave forces and moment are provided.
社団法人日本船舶海洋工学会の論文
2001-03-25

停止時の船に働く定常波力に関する模型実験

スポンサーリンク

概要

著者

関連論文

スポンサーリンク