Source : Shanghai Rui Si BeiDate : 2017-09-05Clicks : Loading...
Refers to the ship in a variety of loading conditions, can float in the water and maintain a certain first, tail draft and freeboard capacity. According to the balance of gravity and buoyancy of the ship, the floating nature of the ship is related to the loading capacity and the safety of navigation.
Refers to the ship by the external force to leave the equilibrium position and tilt, when the external force disappears, the ship can return to the original balance position. The stability includes complete stability and breakability stability, where the integrity of the stability includes the initial stability and the large inclination stability. The stability of the general surface of the ship mainly refers to the stability of the horizontal. Ship width, waterplane surface coefficient, freeboard, center of gravity height, above the surface area of the size and height, as well as the hull seal sealing quality is the main factor affecting the stability of the ship.
Refers to the underwater part of the hull, such as the occurrence of damage, the cabin can still float after the flooding and not overturning capacity. China's Song Dynasty shipbuilding when the first invented the use of watertight compartment to ensure the ship's anti-sink. The rationality of the watertight subdivision of the main part of the ship, the freeboard value of the sub-deck and the stability of the complete ship are the main factors affecting the anti-sink.
Is to characterize the ship in the still water in the straight line speed, and the host power required relationship between the performance. It is an important technical indicators of the ship, the impact on the use of the ship and operating expenses greater impact. The rapidity of ships involves both ship resistance and ship propulsion. Reasonable choice of ship main scale, hull coefficient (especially the square coefficient Cb and prism coefficient Cp) and linear, is the key to reduce ship resistance.
Refers to the ship in the waves in the degree of swing, stall and deck splashing (on the waves, splashing water) and so on. Seismic resistance not only affects the comfort and safety of the crew on board, but also affects the safety and operational benefits of the ship.
The movement of the ship in the waves is rolling, pitching, the first and the last, the heave (the sinking), the cross and the swing. When several movements exist at the same time there is a coupling movement, which is greater impact of the roll, pitch and heave. The splashing is mainly due to the relative movement of the hull and the waves caused by the pitching and dying, increasing the freeboard, especially the first freeboard, and increasing the floating of the first water part is an effective measure to improve the ship's splashing.
Refers to the ship in accordance with the driver's manipulation to maintain or change the speed, course or position of the performance, including the stability and rotation of the two aspects of navigation, is to ensure that the ship sailing less steering, to maintain the shortest range, from the terminal flexible and easy to avoid Timely and important links, related to ship navigation safety and operational economy.
Refers to the size of the ship's investment efficiency. It is to promote the development of new ship type research, improve the shipping management and shipbuilding industry, the most active factor in the development of the growing attention. Ship economy is the content of ship engineering economics research, it involves the use of performance, construction economy, operating economy and investment effects and other indicators.
The development of the ship first depends on the needs of the community for the ship. After the Second World War the rapid growth of bulk cargo (crude oil, mineral grain) transport ship in the technology has been quite mature, the demand is generally not a big increase or decrease. There is a growing trend in the demand for shipments of finished goods and cargo ships, finished oil tankers, chemical tankers, LPG carriers, and large pieces of industrial equipment. The high speed vessels for ships and special uses for marine development will increase. Correspondingly, studies of hydrofoils, hovercraft, catamarans and small waterplane vessels will be strengthened.
The second factor in the development of the ship is the improvement of economic and social benefits. Fuel prices and handling costs will lead to new research on new ship technologies, new energy sources, new models, automatic control methods and new methods from energy saving, downsizing and improved transport methods (from the perspective of the entire transport system) Of the ship type.
The ship on the maritime law of our country refers to ships and other maritime mobile devices, except for ships of military and government affairs and small boats of less than 20 tons.
Ships, refers to rely on human, sailing, engine and other power, can move in the water means of transport. In addition, civil ships are generally referred to as ships, military ships called ships, small boats known as boats or boats, which collectively known as ships or boats.