| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in the ballast adjustment of a hull in which: conventionally a ship raises wave-making from bows, and a submerged section of a hull ship bottom section and a ship side section receives frictional resistance; particularly, a resistance component of a bow section or the amount of resistance increases with the rise of a ship speed by a dynamic pressure; and a navigation speed is limited in terms of an economic viewpoint by both total resistance amounts.SOLUTION: An amount of dynamic pressure resistance received by a bow section is greatly reduced. By this function, a conventionally limited economical speed can be raised easily. The submerged section of a ship bottom section and a ship side section has contact friction resistance related to a water flow speed. In the case of a conventional ship, a contact friction factor is a factor value in a range of 0.04-0.05 as a dynamic friction coefficient, and it is reduced to 0.00152-0.0001, thereby the result reduces necessary horse-power of a propulsion system. Economical efficiency of navigation is greatly increased. Conventionally, a ballast adjusting device of a hull and the complexity of operation are solved by injecting a nitrogen gas and an air pressure into double ship side/ship bottom structures, particularly in the ship bottom structure section. |
