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Ship Model Basin
A ship model basin is a basin or tank used to carry out hydrodynamic tests with ship models, for the purpose of designing a new (full sized) ship, or refining the design of a ship to improve the ship's performance at sea. It can also refer to the organization (often a company) that owns and operates such a facility. An engineering firm acts as a contractor to the relevant shipyards, and provides hydrodynamic model tests and numerical calculations to support the design and development of ships and offshore structures. History The eminent English engineer William Froude published a series of influential papers on ship designs for maximising stability in the 1860s. The Institution of Naval Architects eventually commissioned him to identify the most efficient hull shape. He validated his theoretical models with extensive empirical testing, using scale models for the different hull dimensions. He established a formula (now known as the Froude number) by which the results of small-sc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harland & Wolff
Harland & Wolff Holdings plc is a British shipbuilding and Metal fabrication, fabrication company headquartered in London with sites in Belfast, Arnish yard, Arnish, Appledore, Torridge, Appledore and Methil. It specialises in ship repair, shipbuilding and offshore construction. Today, the company is focused on supporting five sectors: Navy, Defence, Petroleum industry, Energy, Cruise ship, Cruise & Ferry, Renewable energy, Renewables and Maritime transport, Commercial. It offers services including technical services, fabrication & construction, repair & maintenance, in-service support, conversion and decommissioning. Having entered administration (law), administration for the second time in five years, it was bought by Navantia in January 2025. Overview Harland & Wolff is famous for having built the majority of the ocean liners for the White Star Line, including Olympic-class ocean liner, ''Olympic''-class trio – , and HMHS Britannic, HMHS ''Britannic''. Outside of White ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ship Motion Test
In marine engineering, a ship motion test is hydrodynamic test performed with ship models for the purpose of designing a new (full sized) ship, or refining the design of a ship to improve its performance at sea. Tests are carried out in a ship model basin or "towing tank". There are various types of test: the model may be towed along a straight line or circular path, and may be subjected to oscillations. Forces acting on the vessel are measured using a dynamometer. The tests may be evaluating the overall design, or focusing on the characteristics of a propeller. Straight line test The velocity-dependent derivatives Yv and Nv of the ship at any draft and trim can be determined from the model test carried in the towing tank. The model is towed with a constant velocity corresponding to a given ship Froude number at various angles of attack, β. A dynamometer at the origin O, measures the force Y and the moment N experienced by the model at each value of β. The dimensional ship valu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dieudonné Spiral Test
Dieudonné is a French name normally meaning "Gift of God", and thus similar to the Greek-derived Theodore, Hebrew-derived Matthew, or the Spanish Diosdado. It may refer to: People Given name * Dieudonné Cédor (1925–2010), Haitian painter * Dieudonné Costes (1892–1973), French aviator * Dieudonné Disi (born 1980), Rwandan long-distance and cross county runner * Dieudonne Dolassem (born 1979), Cameroonian judoka * Dieudonné Sylvain Guy Tancrède de Dolomieu or Déodat Gratet de Dolomieu (1750–1801), French geologist * Dieudonné Ganga (born c. 1946), Congolese politician and diplomat * Dieudonné Gnammankou, Beninean historian * Dieudonné de Gozon ( 1346–53), French knight * Dieudonné-Félix Godefroid or Félix Godefroid (1818–1897), Belgian harpist * Dieudonné Jamar (1878 – after 1905), Belgian racing cyclist * Dieudonné Kabongo (1950–2011), Congolese-born Belgian humorist and actor * Dieudonné Kalilulika (born 1981), Congolese football player * Dieud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
System Identification
The field of system identification uses statistical methods to build mathematical models of dynamical systems from measured data. System identification also includes the optimal design#System identification and stochastic approximation, optimal design of experiments for efficiently generating informative data for regression analysis, fitting such models as well as model reduction. A common approach is to start from measurements of the behavior of the system and the external influences (inputs to the system) and try to determine a mathematical relation between them without going into many details of what is actually happening inside the system; this approach is called Black box (systems), black box system identification. Overview A dynamic mathematical model in this context is a mathematical description of the dynamic behavior of a system or process in either the time or frequency domain. Examples include: * physical system, physical processes such as the movement of a falling bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berlin-tiergarten Vws 20050404 P1020295
Tiergarten (, literally ''Animal Garden'', historically meaning ''deer park'' or hunting ''game park'') is a locality within the Boroughs of Berlin, borough of Mitte, in central Berlin (Germany). Notable for the great and Großer Tiergarten, homonymous urban park, before German reunification, it was a part of West Berlin. Until Berlin's 2001 administrative reform, Tiergarten was also the name of a borough (Bezirk), consisting of the current locality (''Ortsteil'') of Tiergarten (formerly called ''Tiergarten-Süd'') plus Hansaviertel and Moabit. A new system of road and rail tunnels runs under the park towards Berlin Hauptbahnhof, Berlin's main station in nearby Moabit. History Historical notes Once a hunting ground of the Prince-Elector, Electors of Rulers of Brandenburg, Brandenburg the ''Großer Tiergarten'' park of today was designed in the 1830s by landscape architect Peter Joseph Lenné. In the course of industrialization in the 19th century, a network of streets was laid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UCL OTT
UCL may refer to: Education Universities * University College London, a public university in England * Université catholique de Louvain, a private university in Belgium * UCL University College, a public university in Denmark University libraries * United College Library, a university library of the Chinese University of Hong Kong * Universities' Central Library, a university library of the University of Yangon in Myanmar Sports * UEFA Champions League, an annual pan-European football competition * United Counties League, a football league in England Other uses * Ulnar collateral ligament, in anatomy * Upper control limit, in statistics * Union communiste libertaire, a French anarchist organisation * Uganda Clays Limited Uganda Clays Limited (UCL), commonly referred to as Uganda Clays, is a building materials manufacturer in Uganda. The company manufactures baked clay building products, using Italian-made heavy clay processing machinery. The clay is excavat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Tank
An ice tank is a ship model basin whose purpose is to provide a physical modeling environment for the interaction of ship, structures, or sea floor with both ice and water. Ice tanks may take the form of either a towing tank or Ship model basin, maneuvering basin. Many un-refrigerated ship model basins use ice simulants such as paraffin wax, plaster, and mixtures of foam or plastic beads. The cleanup and handling of such simulants often proves cumbersome. What differentiates an ice tank from other ship model basins is that an ice tank has purpose built provisions into its structure for handling such material conveniently. Use of a refrigerated basin containing mostly water allows freezing and melting to be a convenient method of model ice preparation and cleanup. Ice scaling Ship model basins often simulate full-scale processes in miniature. Ships and structures are reduced linearly in size, and cubic in mass, displacement, and volume. The challenge in ice modeling is correctly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seakeeping
Seakeeping ability or seaworthiness is a measure of how well-suited a watercraft is to conditions when underway. A ship or boat which has good seakeeping ability is said to be very seaworthy and is able to operate effectively even in high sea states. Measure In 1976, St. Denis suggested four principal terms needed to describe a seakeeping performance. These are: *Mission: what the ship is intended to accomplish. The role of the ship while at sea. *Environment: the conditions under which the ship is operating. This can be described as sea state, wind speed, geographic region or some combination thereof. *Ship responses: the response of the ship to the environmental conditions. The responses are a function of the environment and the vessel characteristics. *Seakeeping performance criteria: the established limits for the ship's responses. These are based on the ship motions and the accelerations experienced, and include comfort criteria such as noise, vibration and sea sickness, perfo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cavitation Tunnel
A water tunnel is an experimental facility used for testing the Fluid dynamics, hydrodynamic behavior of submerged bodies in flowing water. It functions similar to a recirculating wind tunnel, but uses water as the working fluid, and related phenomena are investigated, such as measuring the forces on scale models of submarines or lift and drag on hydrofoils. Water tunnels are sometimes used in place of wind tunnels to perform measurements because techniques like particle image velocimetry (PIV) are easier to implement in water. For many cases as long as the Reynolds number is equivalent, the results are valid, whether a submerged water vehicle model is tested in air or an aerial vehicle is tested in water. For low Reynolds number flows, tunnels can use oil instead of water. The advantage is that the increased viscosity will allow the flow to be a higher speed (and thus easier to maintain in a stable manner) for a lower Reynolds number. Often, a tunnel will be co-located with othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
