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## Conference Proceedings Vol. I, II, III

 事業名 海事シミュレーションと船舶操縦に関する国際会議の開催 日本船舶海洋工学会
4.2 Effect of Wind Force

In this study, because the superstructure of the craft is a simple shape as shown in Photo. 2, the coefficients of wind force and moment are obtained from database of Isherwood as shown in Fig. 12. The simulation studies are carried out to obtain the basic characteristic of maneuvering for the outrigger craft in wind. Accordingly, the turning and the zig-zag maneuver are selected for the simulation studies.
The effect of the wind force is a very large for the craft in the turning motions because of the draft is shallow. The maximum deviations (SD/Lpp) in the turning motions are shown in Fig. 13. SD is denoted the deviation from trajectory of calm condition as shown in Fig. 14. True wind direction is zero and the model is type-C in this simulation studies. Also, example for simulation results, trajectories are shown in Fig. 14, and the time histories of ship's speed u , yaw rate r and drift angle βare shown in Fig. 15. In this case, wind speed of the simulation is six times as large as ship's speed (WT/U=6) and the rudder angle is 35 degrees. As can be seen, the craft is pushed down the wind about two ship's length, also, yaw rate and drift angle are strongly influenced of wind force in turning motion. The effect of wind is getting more strongly as the rudder angles are less than 10 degrees.
On the other hand, the effect of wind is rather slight in 10-10 zig-zag maneuver as shown in Fig. 16. The main reason is that the craft has an excellent course keeping ability in the main because the hull is so slender, and the outriggers are large damping of yaw moment. Meanwhile, the true wind direction is -90 degrees in this simulation studies.

Fig. 12 Coefficients of wind force and moment.

 Fig.13 Maximum deviation in turning motions from trajectories of calm condition

 Fig.14 Example of simulation results of turning trajectories under wind force(type-C,rudder angles of 35 degrees).

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 1.MARSIM'03 開催報告 2.本会議及びワークショップ開催状況写真 3.九州における離島住民からみた交通バリアフリー化に関する調査研究?鹿児島県をモデルケースとして?　報告書 [ 同じカテゴリの成果物 ]

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