| 摘要 |
PURPOSE:To obtain a desired swing speed by a method in which the actions previously set by the spud position, sheave position and anchor position of the dredger are compared with the actual action of the dredger, and the rewinding tension of wire is controlled. CONSTITUTION:Various model systems of dredging operations are set up. On the basis of a spud supporting point 4, an acting point O to show sheave position, a fixing point P1 to show swing locus, and fixing point O1 to show anchor 5b in the dredging operation, a function by which the direction cosine costheta of the swing side wire 6a and brake side wire 6b to the swing locus is provided is obtained for each and stored. During the actual dredging operation, on the basis of the supporting point, fixing point, and acting point of the dredging operation and the corresponding functions, the direction conine costheta of the wires 6a and 6b is obtained. On the basis of these values, control is made on the winding speed of the swing side wire and the tension of the brake side wire. |
