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Slamming
Slamming is the impact of the bottom structure of a ship onto the sea surface. It is mainly observed while sailing in waves, when the bow raises from the water and subsequently impacts on it. Slamming induces extremely high loads to ship structures and is taken into consideration when designing ships. Slamming is not strictly limited to ships and is observed watercraft as small as kayaks. , p. 91 For trimarans and catamarans, slamming can occur when an ama slams back down into the sea after being lifted clear by wind or wave action. Slamming can also occur for multihull vessels when the sea strikes an aka that is normally above water level and join the vessel's hulls together. Slamming can occur in relatively mild sea conditions if the vessel is prone to hobby horsing, aka pitching. Hobby horsing is more likely to occur aboard vessels where the bow and stern sections are both narrow. References See also * Ship collision * MSC Napoli ''MSC Napoli'' was a United Ki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephone Slamming
Telephone slamming is an illegal telecommunications practice, in which a subscriber's telephone service is changed without their consent. Slamming became a more visible issue after the deregulation of the telecommunications industry in the mid-1980s, especially after several price wars between the major telecommunications companies. The term ''slamming'' was coined by Mick Ahearn, who was a consumer marketing manager at AT&T in September 1987. The inspiration for the term came from the ease at which a competitor could switch a customer's service away from AT&T by falsely notifying a telephone company that an AT&T customer had elected to switch to their service. This process gave AT&T's competitors a "slam dunk" method for the unauthorized switching of a customer's long-distance service. The term ''slamming'' became an industry standard term for this practice. Variations of this concept include "merchant account slamming" or "credit card processing slamming" in which a business ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Domain Slamming
Domain name scams are types of Intellectual property scams or confidence scams in which unscrupulous domain name registrars attempt to generate revenue by tricking businesses into buying, selling, listing or converting a domain name. The Office of Fair Trading in the United Kingdom has outlined two types of domain name scams which are "Domain name registration scams" and "Domain name renewal scams". Domain slamming Domain slamming (also known as unauthorized transfers or domain name registration scams) is a scam in which the offending domain name registrar attempts to trick domain owners into switching from their existing registrar to theirs, under the pretense that the customer is simply renewing their subscription to their current registrar. The term derives from telephone slamming. Prevention In 2004, ICANN, the domain name governing body, made changes to its policy for transferring domains between registrars. They introduced a single protective measure that can help prev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ship Collision
Ship collision is the structural impact between two ships or one ship and a floating or still object such as an iceberg. Ship collisions are of particular importance in marine accidents. Some reasons for the latter are: * The loss of human life. * The environmental impact of oil spills, especially where large tanker ships are involved. * Financial consequences to local communities close to the accident. * The financial consequences to shipowners, due to ship loss or penalties. * Damage to coastal or off-shore infrastructure, for example collision with bridges. As sea lanes are getting more congested and ship speeds higher, there is a good possibility that a ship may experience an important accident during her lifetime. Higher speeds may cause larger operational loads, like slamming, or excessively severe loads, for example during a collision. Denser sea routes increase the probability of an accident—in particular a collision—involving ships or ships and shore or offshore s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MSC Napoli
''MSC Napoli'' was a United Kingdom- flagged container ship that developed a hull breach due to rough seas and slamming in the English Channel on 18 January 2007. She was deliberately run aground at Lyme Bay to avoid an environmental disaster and broken up by salvors. Early history The ship was built in 1991 and had a capacity of 4,419 TEU (62,000 tons). She was built by Samsung Heavy Industries, Kŏje, South Korea; owned by Metvale Ltd., a British Virgin Islands Brass Plate single entity company; managed by Zodiac Maritime; and was under charter to Mediterranean Shipping Company. On 27 March 2001, then named CMA CGM ''Normandie'', she was en route from Port Klang in Malaysia to the Indonesian capital, Jakarta when she ran aground on a reef in the Singapore Strait and remained stuck for several weeks. She was repaired by the Hyundai-Vinashin Shipyard in Khánh Hòa Province, Vietnam, which included the welding of more than 3,000 tonnes of metal onto the hull. Kyrill W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naval Architecture
Naval architecture, or naval engineering, is an engineering discipline incorporating elements of mechanical, electrical, electronic, software and safety engineering as applied to the engineering design process, shipbuilding, maintenance, and operation of marine vessels and structures. Naval architecture involves basic and applied research, design, development, design evaluation (classification) and calculations during all stages of the life of a marine vehicle. Preliminary design of the vessel, its detailed design, construction, trials, operation and maintenance, launching and dry-docking are the main activities involved. Ship design calculations are also required for ships being modified (by means of conversion, rebuilding, modernization, or repair). Naval architecture also involves formulation of safety regulations and damage-control rules and the approval and certification of ship designs to meet statutory and non-statutory requirements. Main subjects The word "vessel" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trimaran
A trimaran (or double-outrigger) is a multihull boat that comprises a main hull and two smaller outrigger hulls (or "floats") which are attached to the main hull with lateral beams. Most modern trimarans are sailing yachts designed for recreation or racing; others are ferries or warships. They originated from the traditional double-outrigger hulls of the Austronesian cultures of Maritime Southeast Asia; particularly in the Philippines and Eastern Indonesia, where it remains the dominant hull design of traditional fishing boats. Double-outriggers are derived from the older catamaran and single-outrigger boat designs. Terminology The word "trimaran" is a portmanteau of "tri" and "(cata)maran", a term that is thought to have been coined by Victor Tchetchet, a pioneering, Ukrainian-born modern multihull designer. Trimarans consist of a main hull connected to outrigger floats on either side by a crossbeam, wing, or other form of superstructure—the traditional Polynesian ter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catamaran
A Formula 16 beachable catamaran Powered catamaran passenger ferry at Salem, Massachusetts, United States A catamaran () (informally, a "cat") is a multi-hulled watercraft featuring two parallel hulls of equal size. It is a geometry-stabilized craft, deriving its stability from its wide beam, rather than from a ballasted keel as with a monohull boat. Catamarans typically have less hull volume, smaller displacement, and shallower draft (draught) than monohulls of comparable length. The two hulls combined also often have a smaller hydrodynamic resistance than comparable monohulls, requiring less propulsive power from either sails or motors. The catamaran's wider stance on the water can reduce both heeling and wave-induced motion, as compared with a monohull, and can give reduced wakes. Catamarans were invented by the Austronesian peoples which enabled their expansion to the islands of the Indian and Pacific Oceans. Catamarans range in size from small sailing or rowi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multihull
A multihull is a boat or ship with more than one hull, whereas a vessel with a single hull is a monohull. The most common multihulls are catamarans (with two hulls), and trimarans (with three hulls). There are other types, with four or more hulls, but such examples are very rare and tend to be specialised for particular functions. Sailing multihulls Counter-intuitively, it is unhelpful to think of the design progression to be "1-2-3", namely monohull - catamaran - trimaran; rather, it is "1-3-2". A sailing trimaran is, in effect, a modified monohull with lightweight outrigger hulls (or "amas") for stability instead of a heavy deep keel; so it follows that a sailing trimaran will be lighter and faster than a sailing monohull. A sailing trimaran will have a centre hull that may comprise up to 90% of total hull volume, and 95% of total deadweight. A sailing trimaran at rest will have both amas out of the water and, when heeled, will only ever have one of the amas immersed. As ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ship Motions
Ship motions are defined by the six degrees of freedom that a ship, boat or any other craft can experience. Reference axes The '' vertical/Z axis'', or ''yaw axis'', is an imaginary line running vertically through the ship and through its centre of mass . A yaw motion is a side-to side movement of the bow and stern of the ship. The '' transverse/Y axis'', ''lateral axis'', or ''pitch axis'' is an imaginary line running horizontally across the ship and through the centre of mass. A pitch motion is an up-or-down movement of the bow and stern of the ship. The '' longitudinal/X axis'', or ''roll axis'', is an imaginary line running horizontally through the length of the ship, through its centre of mass, and parallel to the ''waterline''. A roll motion is a side-to-side or port-starboard tilting motion of the superstructure around this axis. Rotational There are three special axes in any ship, called longitudinal, transverse and vertical axes. The movements around them ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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