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What is meant by displacement in a boat?

What is meant by displacement in a boat?

1. Displacement is an important indicator used to indicate the size of the ship. It is the quality of the water discharged when the ship is full of cargo according to the design requirements. Displacement is usually expressed in tonnage, the so-called displacement tonnage is the tonnage of boiling water discharged by the ship in the water. 2. The displacement can be divided into light load displacement, standard displacement, normal displacement, full load displacement and overload displacement.

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What does the speed mean?

What does the speed mean?

Section (English: knot), the unit symbol kn, is a rate unit dedicated to navigation, which extends to aviation and is equivalent to the number of nautical miles traveled by a ship or aircraft per hour. 1 knot = 1 nautical mile/hour = 1.852 km/h = 0.514444 m/s. Mileage traveled by a ship in a unit of time. Calculated in nautical miles per hour, referred to as knots. It is one of the most important tactical and technical performances of a ship. Usually, the speed of surface ships is divided into maximum speed, full speed, cruise speed, economic speed and minimum speed. At present, the speed of large ships such as aircraft carriers and missile destroyers is usually about 30 knots, while the speed of small ships such as missile speedboats and torpedo speedboats is usually 40 to 60 knots. A nautical mile is a unit of length at sea. It originally refers to the length of the latitude interval of 1 minute on the meridian of the earth. Because the earth is slightly ellipsoidal, the radian of 1 minute at different latitudes is slightly different. 1 nautical mile on the equator is about 1843 meters; Latitude 45 ° is equal to about 1852.2 meters, the poles are equal to about 1861.6 meters. In 1929, the International Conference on Hydrology and Geography adopted an average length of 1852 meters as one nautical mile. In 1948, the International Conference on the Safety of Life recognized that 1852 meters or 6076.115 feet was 1 nautical mile, so the international standard nautical mile length was 1852 meters. China recognizes this standard, denoted by the code "M.

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Hazards of Concealing Tonnage of Ships

Hazards of Concealing Tonnage of Ships

With the continuous development of the national economy and water transport, the trend of large-scale ship development is becoming more and more obvious, and the passing volume of ships is increasing year by year. However, due to the relative backwardness of certain management links and the blind pursuit of maximizing the interests of the crew, speculation, concealment of tonnage, evasion of payment of fees and other unfair means of competition have emerged, seriously infringing on the interests of the State.

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Impact of Large Empty Ship Weight on Ships

Impact of Large Empty Ship Weight on Ships

The impact of the large weight of the empty ship on the ship is stability, load capacity, navigation performance. 1. The stability of the ship refers to the balance ability of the ship in the water. The increase of the weight of the empty ship will affect the stability of the ship, making it easier to tilt or unstable, which will have a negative impact on the safety and operability of the ship. The larger the empty weight of the ship, the smaller its effective load capacity, which means that the carrying capacity of the ship will be limited when loading cargo. 3. The increase of the weight of the empty ship will affect the navigation performance of the ship, such as acceleration, maneuverability and speed, and the larger weight of the empty ship will lead to the decrease of the maneuverability of the ship, thus affecting the operation and navigation ability of the ship.

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What is the relationship between ship tonnage and ship performance?

What is the relationship between ship tonnage and ship performance?

The larger the tonnage of the ship, the more various things it can carry. If it is a warship, it means that it has strong firepower and strong continuous combat capability. Displacement is a sign of the size of a surface ship and is one of the tactical and technical performance elements. The displacement of surface ships is divided into no-load displacement, standard displacement, normal displacement, full-load displacement and maximum displacement. No-load displacement: refers to the weight of the ship after the completion of construction and the installation of various devices and equipment, excluding the weight of personnel, luggage, food, liquid, load, ammunition, supplies, fuel, lubricating oil, water supply, aviation fuel, etc. Standard displacement: refers to the ship's no-load displacement plus the rated personnel, luggage, food, liquid, load, ammunition, supplies, etc. Normal displacement: The standard displacement of a ship plus the fuel, lubricating oil, water supply, aviation kerosene and 100 percent of the loading weight required to ensure 50 percent of the endurance and self-sufficiency is often used as the displacement for ship design and formal trial. Full-load displacement: refers to the ship's standard displacement plus the fuel, lubricating oil, water, aviation kerosene, and 100 percent loaded weight required to ensure 100 percent of the endurance and self-supply. Maximum displacement: refers to the ship's full-load displacement plus the weight of fuel oil, lubricating oil, water supply, ammunition, etc.

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Modern Crafts of Shipbuilding

Modern Crafts of Shipbuilding

Hull lofting Linear lofting: manual lofting and machine (computer) lofting, manual lofting is generally 1:1 ratio, the sample table takes up a large area, requires more manpower and material resources, and is less used; Machine lofting is also called mathematical lofting. It relies on advanced technical software to lofting the hull. The mathematical lofting has high accuracy and does not occupy space and manpower. Machine lofting is widely used. Structure lofting and unfolding: lofting and unfolding of each structure, drawing the corresponding processing template and sample bar. Billing Sketch: Sketch the corresponding blanking. steel pretreatment Pretreatment of steel surface to eliminate stress. Steel correction: generally for mechanical methods, that is, the use of multi-roll straightening machine, hydraulic press, steel straightening machine, etc. Surface cleaning: a. Mechanical derusting method, such as shot blasting derusting method shot blasting derusting method, more widely used; B. Pickling rust removal method, also known as chemical rust removal, the use of chemical reactions; C. manual rust removal method, with hammer and other tools to knock rust component processing Edge processing: shearing, cutting, etc; Cold and hot processing: eliminate stress, deformation, etc; Molding processing: oil press, cold bending machine, etc. Hull Assembly Hull (parts) assembly, the various components of the combination of splicing into a variety of space we need shape. hull welding The shape of the assembled space is welded to become a permanent integral whole. tightness test All kinds of tightness test, such as coloring test, ultrasonic, X, etc. ship launching After the basic formation, all the volume below the design line is the immersion volume. Gravity launching: the general method is launching from the ship's platform, which is launched by the ship's own weight and sliding speed; Buoyancy launching: generally in the form of a dock; Machine launching: suitable for small and medium-sized ships, towed or hoisted by machinery and equipment. Ship Outfitting Ship outfitting to carry out a comprehensive outfitting system, mooring system, machine fitting, electrical equipment, pipe fitting and other aspects of the work. ship test Ship test berthing test, tilt test, trial (comprehensive test of the ship's performance).

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