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Hogging And Sagging
In solid mechanics, structural engineering, and shipbuilding, hogging and sagging describe the shape that a beam or similar long object will deform into when loading is applied. ''Hogging'' describes a beam that curves upwards in the middle, and ''sagging'' describes a beam that curves downwards. Ships Dynamic stress Hogging is the stress a ship's hull or keel experiences that causes the center or the keel to bend upward. Sagging is the stress a ship's hull or keel is placed under when a wave is the same length as the ship and the ship is in the trough of two waves. This causes the middle of the ship to bend down slightly, and depending on the level of bend, may cause the hull to snap or crack. Sagging or dynamic hogging may have been what sank the ''Prestige'' off Spain on 19 November 2002. The 2013 loss of container ship ''MOL Comfort'' off the coast of Yemen was attributed to hogging. Subsequent lawsuits blamed the shipbuilder for design flaws. Time-induced stress Hogging, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solid Mechanics
Solid mechanics, also known as mechanics of solids, is the branch of continuum mechanics that studies the behavior of solid materials, especially their motion and deformation under the action of forces, temperature changes, phase changes, and other external or internal agents. Solid mechanics is fundamental for civil, aerospace, nuclear, biomedical and mechanical engineering, for geology, and for many branches of physics such as materials science. It has specific applications in many other areas, such as understanding the anatomy of living beings, and the design of dental prostheses and surgical implants. One of the most common practical applications of solid mechanics is the Euler–Bernoulli beam equation. Solid mechanics extensively uses tensors to describe stresses, strains, and the relationship between them. Solid mechanics is a vast subject because of the wide range of solid materials available, such as steel, wood, concrete, biological materials, textiles, geological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drydock
A dry dock (sometimes drydock or dry-dock) is a narrow basin or vessel that can be flooded to allow a load to be floated in, then drained to allow that load to come to rest on a dry platform. Dry docks are used for the construction, maintenance, and repair of ships, boats, and other watercraft. History Greco-Roman world The Greek author Athenaeus of Naucratis (V 204c-d) reports something that may have been a dry dock in Ptolemaic Egypt in the reign of Ptolemy IV Philopator (221-204 BC) on the occasion of the launch of the enormous ''Tessarakonteres'' rowing ship. It has been calculated that a dock for a vessel of such a size might have had a volume of 750,000 gallons of water. In Roman times, a shipyard at Narni, which is still studied, may have served as a dry dock. Medieval China The use of dry docks in China goes at least as far back the 10th century A.D. In 1088, Song Dynasty scientist and statesman Shen Kuo (1031–1095) wrote in his '' Dream Pool Essays'': Renais ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hog Chains
Hog may refer to: Animals * Pig ** Usually referring to the domestic pig ** Sometimes referring to other animals in the family Suidae, including: *** Warthog *** Red river hog *** Giant forest hog * groundhog * hedgehog * hog (sheep), a yearling sheep, as yet unshorn Other uses * Harley-Davidson, a motorcycle manufacturer ** Harley Owners Group * The Hogs (American football), a prior nickname for the offensive line of the Washington Redskins * Hogging and sagging, a nautical term * Hogging (sexual practice) * Higher order grammar * Histogram of oriented gradients, used in computer vision and image processing for the purpose of object detection * House of Guitars * Arkansas Razorbacks, the sports teams of the University of Arkansas * Frank País Airport, IATA symbol HOG * Hidden Object Game, a Puzzle video game#Hidden object game, genre of casual puzzle games * Hogarthian or Hog, a scuba diving gear configuration pioneered by William Hogarth Main See also * Sandhog, the slang t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strength Of Ships
The strength of ships is a topic of key interest to naval architects and shipbuilders. Ships which are built too strong are heavy, slow, and cost extra money to build and operate since they weigh more, whilst ships which are built too weakly suffer from minor hull damage and in some extreme cases catastrophic failure and sinking. Loads on ship hulls The hulls of ships are subjected to a number of loads. *Even when sitting at dockside or at anchor, the pressure of surrounding water displaced by the ship presses in on its hull. *The weight of the hull, and of cargo and components within the ship bears down on the hull. *Wind blows against the hull, and waves run into it. *When a ship moves, there is additional hull drag, the force of propellers, water driven up against the bow. *When a ship is loaded with cargo, it may have many times its own empty weight of cargo pushing down on the structure. *In heavy seas, water flowing over or crashing down onto the weather deck applies (possi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glossary Of Nautical Terms
This glossary of nautical terms is an alphabetical listing of terms and expressions connected with ships, shipping, seamanship and navigation on water (mostly though not necessarily on the sea). Some remain current, while many date from the 17th to 19th centuries. The word nautical derives from the Latin ''nauticus'', from Greek ''nautikos'', from ''nautēs'': "sailor", from ''naus'': "ship". Further information on nautical terminology may also be found at Nautical metaphors in English, and additional military terms are listed in the Multiservice tactical brevity code article. Terms used in other fields associated with bodies of water can be found at Glossary of fishery terms, Glossary of underwater diving terminology, Glossary of rowing terms, and Glossary of meteorology. This glossary is split into two articles: * terms starting with the letters A to L are at Glossary of nautical terms (A-L) * terms starting with the letters M to Z are at Glossary of nautical terms (M-Z). __NO ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deflection (engineering)
In structural engineering, deflection is the degree to which a part of a structural element is displaced under a load (because it deforms). It may refer to an angle or a distance. The deflection distance of a member under a load can be calculated by integrating the function that mathematically describes the slope of the deflected shape of the member under that load. Standard formulas exist for the deflection of common beam configurations and load cases at discrete locations. Otherwise methods such as virtual work, direct integration, Castigliano's method, Macaulay's method or the direct stiffness method are used. The deflection of beam elements is usually calculated on the basis of the Euler–Bernoulli beam equation while that of a plate or shell element is calculated using plate or shell theory. An example of the use of deflection in this context is in building construction. Architects and engineers select materials for various applications. [Baidu] |
Simpson's Rules (ship Stability)
Simpson's rules are a set of rules used in ship stability and naval architecture, to calculate the areas and volumes of irregular figures. This is an application of Simpson's rule for finding the values of an integral, here interpreted as the area under a curve. Simpson's 1st rule Also known as the 1–4–1 rule (after the multipliers used ). : \text = \frac( a + 4b + c). Simpson's 2nd rule Also known as the 1–3–3–1 rule, Simpson's second rule is a simplified version of Simpson Rule, Simpson's 3/8 rule. : \text = \frac 8 (a + 3b + 3c + d). Simpson's 3rd rule Also known as the 5–8–1 rule, SImpson's third rule is used to find the area between two consecutive ordinates when three consecutive ordinates are known. : \text = \frac h (5a + 8b - c ). This estimates the area in the left half of the figure for Simpson's 1st Rule while using all three pieces of data. Use of Simpsons rules Simpson's rules are used to calculate the volume of lifeboat (shipb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cargo
Cargo consists of bulk goods conveyed by water, air, or land. In economics, freight is cargo that is transported at a freight rate for commercial gain. ''Cargo'' was originally a shipload but now covers all types of freight, including transport by rail, van, truck, or intermodal container. The term cargo is also used in case of goods in the cold-chain, because the perishable inventory is always in transit towards a final end-use, even when it is held in cold storage or other similar climate-controlled facility. The term freight is commonly used to describe the movements of flows of goods being transported by any mode of transportation. Multi-modal container units, designed as reusable carriers to facilitate unit load handling of the goods contained, are also referred to as cargo, especially by shipping lines and logistics operators. Similarly, aircraft ULD boxes are also documented as cargo, with an associated packing list of the items contained within. When empty conta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UK P&I Club
The UK P&I Club is a marine mutual liability insurer in the United Kingdom providing P&I insurance for the global shipping industry. The UK P&I Club is one of the 13 members of the International Group of P&I Clubs. The club is one of the largest of the global P&I Clubs and in 2002 covered more than 100 million tons across 6,000 ships. In 2019, the Club provided insurance for over 144 million gross tons of merchant shipping. History The UK P&I Club was founded as the United Kingdom Mutual Steam Ship Assurance Association. In 1886, Thomas Miller, took over the management of the club and the company Thomas Miller still manages the UK P&I Club as of 2021. In 2018, the insurer began the process of setting up a subsidiary in Rotterdam as a result of the Brexit. The club is responsible for the Protection and Indemnity (third party) liabilities insurance coverage for the container ship Ever Given that grounded and blocked the Suez Canal in 2021. The club was responsible for reaching an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Load-Line
The waterline is the line where the hull of a ship meets the surface of the water. Specifically, it is also the name of a special marking, also known as an international load line, Plimsoll line and water line (positioned amidships), that indicates the draft of the ship and the legal limit to which a ship may be loaded for specific water types and temperatures in order to safely maintain buoyancy, particularly with regard to the hazard of waves that may arise. Varying water temperatures will affect a ship's draft, because warm water is less dense than cold water, providing less buoyancy. In the same way, fresh water is less dense than salinated or seawater with a similar lessening effect upon buoyancy. For vessels with displacement hulls, the hull speed is defined by, among other things, the waterline length. In a sailing boat, the waterline length can change significantly as the boat heels, and can dynamically affect the speed of the boat. A waterline can also refer to any l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plimsoll Line
The waterline is the line where the hull of a ship meets the surface of the water. Specifically, it is also the name of a special marking, also known as an international load line, Plimsoll line and water line (positioned amidships), that indicates the draft of the ship and the legal limit to which a ship may be loaded for specific water types and temperatures in order to safely maintain buoyancy, particularly with regard to the hazard of waves that may arise. Varying water temperatures will affect a ship's draft, because warm water is less dense than cold water, providing less buoyancy. In the same way, fresh water is less dense than salinated or seawater with a similar lessening effect upon buoyancy. For vessels with displacement hulls, the hull speed is defined by, among other things, the waterline length. In a sailing boat, the waterline length can change significantly as the boat heels, and can dynamically affect the speed of the boat. A waterline can also refer to any l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yemen
Yemen (; ar, ٱلْيَمَن, al-Yaman), officially the Republic of Yemen,, ) is a country in Western Asia. It is situated on the southern end of the Arabian Peninsula, and borders Saudi Arabia to the Saudi Arabia–Yemen border, north and Oman to the Oman–Yemen border, northeast and shares maritime borders with Eritrea, Djibouti, and Somalia. Yemen is the second-largest Arabs, Arab sovereign state in the peninsula, occupying , with a coastline stretching about . Its constitutionally stated Capital city, capital, and largest city, is Sanaa. As of 2021, Yemen has an estimated population of some 30.4 million. In ancient times, Yemen was the home of the Sabaeans, a trading state that included parts of modern-day Ethiopia and Eritrea. Later in 275 AD, the Himyarite Kingdom was influenced by Judaism. Christianity arrived in the fourth century. Islam spread quickly in the seventh century and Yemenite troops were crucial in the early Islamic conquests. Several Dynasty, dynasties ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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