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Mudyug (icebreaker)
''Mudyug'' () is a Russian icebreaker and the lead ship of a series of three subarctic icebreakers built at Wärtsilä Hietalahti shipyard, Helsinki shipyard in Finland in 1982–1983. The vessel's non-rebuilt sister ships are Magadan (icebreaker), ''Magadan'' and Dikson (icebreaker), ''Dikson''. ''Mudyug'' was rebuilt with a new Thyssen-Waas icebreaking bow at Nordseewerke in 1986. Design ''Mudyug'' was originally built with a length overall, overall length of , or if the towing notch is included, and a maximum Beam (nautical), beam of . However, the 1986 conversion increased the vessel's hull length to and beam to at the widest point of the hull. When loaded to the maximum draught of , the icebreaker has a displacement (ship), displacement of , about 30% greater than that of the non-rebuilt sister ships. The vessel's ice class, LL4, is intended for icebreaking operations primarily in ports and coastal areas. Unlike most icebreakers, ''Mudyug'' has a diesel-mechanical pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nordseewerke
Nordseewerke Emden GmbH (sometimes abbreviated NSWE, in English: North Sea Company) was a shipbuilding company, located in the Emden Harbor of the north German city of Emden. Founded in 1903, shipbuilding ended in 2010, and the company was taken over by the ''Schaaf Industrie AG'', which among other products, makes components for off-shore systems. The shipyard employed some 1,400 people in 2010 and was the second-largest employer in Emden, following the plant of the Volkswagen automotive company. Today only few of the former coworkers of the shipyard are still employed with the new owner Schaaf, which also went insolvent in 2012. History Nordseewerke was founded on March 11, 1903, and was one of the oldest among the still-existing shipyards in Germany. Its successor was the ''Schaaf Industrie AG''. The company built merchant ships of all categories, but also ships for the Kaiserliche Marine during World War I, the Kriegsmarine later, and today's modern Deutsche Marine. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Motor
An electric motor is a machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a electromagnetic coil, wire winding to generate Laplace force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates in reverse, converting mechanical energy into electrical energy. Electric motors can be powered by direct current (DC) sources, such as from batteries or rectifiers, or by alternating current (AC) sources, such as a power grid, Inverter (electrical), inverters or electrical generators. Electric motors may also be classified by considerations such as power source type, construction, application and type of motion output. They can be brushed motor, brushed or brushless motor, brushless, single-phase electric power, single-phase, two-phase electric power, two-phase, or three-phase electric p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diesel Generator
A diesel generator (DG) (also known as a diesel genset) is the combination of a diesel engine with an electric generator (often an alternator) to generate electrical energy. This is a specific case of an engine generator. A diesel compression-ignition engine is usually designed to run on diesel fuel, but some types are adapted for other liquid fuels or natural gas (CNG). Diesel generating sets are used in places without connection to a power grid or as an emergency power supply if the grid fails, as well as for more complex applications such as peak-lopping, grid support, and export to the power grid. Diesel generator size is crucial to minimize low load or power shortages. Sizing is complicated by the characteristics of modern electronics, specifically non-linear loads. Its size ranges around 50 MW and above, an open cycle gas turbine is more efficient at full load than an array of diesel engines, and far more compact, with comparable capital costs; but for regular pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet Union, it dissolved in 1991. During its existence, it was the list of countries and dependencies by area, largest country by area, extending across Time in Russia, eleven time zones and sharing Geography of the Soviet Union#Borders and neighbors, borders with twelve countries, and the List of countries and dependencies by population, third-most populous country. An overall successor to the Russian Empire, it was nominally organized as a federal union of Republics of the Soviet Union, national republics, the largest and most populous of which was the Russian SFSR. In practice, Government of the Soviet Union, its government and Economy of the Soviet Union, economy were Soviet-type economic planning, highly centralized. As a one-party state go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bollard Pull
Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft. It is defined as the force (usually in tonnes-force or kilonewtons (kN)) exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test (but sometimes simulated) under test conditions that include calm water, no tide, level trim, and sufficient depth and side clearance for a free propeller stream. Like the horsepower or mileage rating of a car, it is a convenient but idealized number that must be adjusted for operating conditions that differ from the test. The bollard pull of a vessel may be reported as two numbers, the ''static'' or ''maximum'' bollard pull – the highest force measured – and the ''steady'' or ''continuous'' bollard pull, the average of measurements over an interval of, for example, 10 minutes. An equivalent measurement on land is known as drawbar pull, or tractive force, which is used to measure the total hori ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moment Of Inertia
The moment of inertia, otherwise known as the mass moment of inertia, angular/rotational mass, second moment of mass, or most accurately, rotational inertia, of a rigid body is defined relatively to a rotational axis. It is the ratio between the torque applied and the resulting angular acceleration about that axis. It plays the same role in rotational motion as mass does in linear motion. A body's moment of inertia about a particular axis depends both on the mass and its distribution relative to the axis, increasing with mass and distance from the axis. It is an intensive and extensive properties, extensive (additive) property: for a point particle, point mass the moment of inertia is simply the mass times the square of the perpendicular distance to the axis of rotation. The moment of inertia of a rigid composite system is the sum of the moments of inertia of its component subsystems (all taken about the same axis). Its simplest definition is the second Moment (physics), mome ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flywheel
A flywheel is a mechanical device that uses the conservation of angular momentum to store rotational energy, a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assuming the flywheel's moment of inertia is constant (i.e., a flywheel with fixed mass and second moment of area revolving about some fixed axis) then the stored (rotational) energy is directly associated with the square of its rotational speed. Since a flywheel serves to store mechanical energy for later use, it is natural to consider it as a kinetic energy analogue of an electrical Inductor. Once suitably abstracted, this shared principle of energy storage is described in the generalized concept of an accumulator. As with other types of accumulators, a flywheel inherently smooths sufficiently small deviations in the power output of a system, thereby effectively playing the role of a low-pass filter with respect to the mechanical veloc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bosch Rexroth
Bosch Rexroth AG is an engineering firm based in Lohr am Main in Germany. It is the result of a merger on 1 May 2001, between Mannesmann Rexroth AG and the Automation Technology Business Unit of Robert Bosch GmbH, and is a wholly owned subsidiary of Robert Bosch GmbH. Bosch Rexroth employs over 31,000 people worldwide, and achieved total revenue of 6.2 billion euro in 2021. In 2011 Bosch Rexroth acquired the hydraulic motor business formerly owned by Hägglund & Söner. The company maintains a manufacturing base in the Swedish town of Örnsköldsvik Örnsköldsvik (; ), often shortened to just Ö-vik, is a Urban areas in Sweden, locality and the seat of Örnsköldsvik Municipality in Västernorrland County, Sweden, with 32,953 inhabitants in 2017. Its natural harbour and archipelago is in th ... that was the home of Hägglund & Söner, and still manufactures products using the Hägglunds brand. Products and markets Bosch Rexroth manufactures products and systems associa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Straight-8 Engine
The straight-eight engine or inline-eight engine (often abbreviated as I8) is an eight-cylinder internal combustion engine with all eight cylinders mounted in a straight line along the crankcase. The type has been produced in side-valve, IOE, overhead-valve, sleeve-valve, and overhead-cam configurations. A straight-eight can be timed for inherent primary and secondary balance, with no unbalanced primary or secondary forces or moments. However, crankshaft torsional vibration, present to some degree in all engines, is sufficient to require the use of a harmonic damper at the accessory end of the crankshaft. Without such damping, fatigue cracking near the rear main bearing journal may occur, leading to engine failure. Although an inline six-cylinder engine can also be timed for inherent primary and secondary balance, a straight-eight develops more power strokes per revolution and, as a result, will run more smoothly under load than an inline six. Also, due to the even numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Class
Ice class refers to a notation assigned by a classification society or a national authority to denote the additional level of strengthening as well as other arrangements that enable a ship to navigate through sea ice. Some ice classes also have requirements for the ice-going performance of the vessel. Significance of ice class Not all ships are built to an ice class. Building a ship to an ice class means that the hull must be thicker, and more scantlings must be in place. Sea chests may need to be arranged differently depending on the class. Sea bays may also be required to ensure that the sea chest does not become blocked with ice. Most of the stronger classes require several forms of rudder and propeller protection. Two rudder pintles are usually required, and strengthened propeller tips are often required in the stronger ice classes. More watertight bulkheads, in addition to those required by a ship's normal class, are usually required. In addition, heating arrangement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
