風圧による船舶の横偏流について-II(日本航海学会第31回講演会)

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To investigate the ship's drifting due to wind action is an important item from the viewpoint of navigation. However it is very difficult to select the drifting due to wind force from the entire drifting on the sea which reflected the influences of wind, wave, swell, and current. The authors planned to measure the side-drifting due to wind action with parameter V (speed of ship) when the ship's course took a right angle to the wind direction and her speed was 0, 3, 6, 9kt. The method 1. This experiment was carried out in Hokusei maru, a fishing training ship of Hokkaido University, in the Okhotsk sea and the north Pacific Ocean. 2. The corner reflector which was connected to the salmon-gill net was selected as the datum point of experiment. In this case, the reflector was allowed to drift equally with the ship by current and wave, but felt no effect from the wind in spite of the movement of the ship. 3. As shown in Fig.1, the observers on the ship measured the distance and bearing of the reflector by radar at observation points one and two and calculated the side-drifting by those elements and the course and distance of the ship. The result 1. The relation between the wind velocity and drifting are expressed by equation (1)〜(4). 2. The relation between the proportional coefficient (K) in the equations (1)〜(4) and the ship's speed (V) is shown K=0.123e^<-0.137V> 3. By 1, 2, they searched the relation between the drifting and the ship's speed and wind velocity, and got the experimental equation as follows U(kt)=0.123e^<-0.137V>W(m/sec). 4. The calculated value in the above-mentioned equation against any combination of wind velocity and ship's speed are indicated in Table 2. 5. The correction angle of the course is indicated in Table 3 when the ship's course took a right angle to the direction of the wind.
社団法人日本航海学会の論文
1965-01-25

風圧による船舶の横偏流について-II(日本航海学会第31回講演会)

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