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Rotational oscillation
| Морской словарь |
Three of the six possible ship motions in response to the sea are pivoting movements. • roll is due to waves hitting the ship abeam, tipping it over on its side, pivoting around its longitudinal axis until the centre of gravity pulls it up again. an extra heavy roll is seldom due to inherent lack of stability, but probably indicates that the encounter period is close to the natural period of the vessel. (see also synchronous roll and parametric roll.) • pitch occurs when crests and troughs moving parallel to the ship toss its stem and stern upward and downward. this is effectively roll around the vessel’s transverse axis but, because a ship is far longer than it is wide, the effects are quite different. the period is longer and even a small angle is so magnified by the time it reaches the extremities that they may be lifted clear of the water. a raised bow can then slam back, producing a cascade of water across the forward weather deck and, possibly, a “whipping” effect throughout the length of the hull; while a rising stern can lift the propeller out of the water, with a danger of engine damage due to racing. experiments with anti-pitch fins have met with little success, and changing the vessel’s speed or course remains the most effective response. • yaw is oscillation horizontally around the vertical axis. in conditions of yaw, the vessel’s centre of buoyancy moves steadily forward in the desired direction while its stem and stern skid alternately to port and starboard. yaw caused by wave action in a seaway is especially difficult to control because wave profiles and pressures are not usually the same to port and starboard and these inequalities are compounded by orbital motion of water in the seaway as wave profiles change. moreover, at every half wavelength the water next to the rudder will be moving in the same direction as the vessel, compounding the helmsman’s problems. the winds and waves that cause these motions may come from anywhere and can rapidly change direction, but the ship’s period of encounter is more important than the absolute period of the wave-form or its direction. this is because the ship is moving relative to the seaway and will meet crests and troughs more frequently or less depending on its speed, and whether it is headed into the waves, diagonally across them, or broadside on.
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Oscillate, английский
Oscillatin, английский
- Marine-engine. a steam-engine where the top of the piston-rod is coupled with the crank, and the piston-rod moves backward and forward in the direction of the axis of the cylinder, while its extremity revolves in a circle with the crank.
- Pump-spear. a contrivance by which the pumps of a large vessel are worked, connected with a crank-shaft and fly-wheel, driven by handles in the same way as a winch.
Oscillating arc, английский
Oscillating arc-voltage control system, английский
Oscillating beam, английский
Oscillating breeze, английский
Неустойчивый ветер
Oscillating conveyor, английский
Oscillating die press, английский
Oscillating discharge conveyor, английский
Oscillating displacement pump, английский
Насос возвратно-поступательного действия
Oscillating electrode, английский
Oscillating feeder, английский
Oscillating flame, английский
Пульсирующее пламя
Oscillating grease table, английский
Oscillating holder, английский
Oscillating mine, английский
In naval mine warfare, a hydrostatically- controlled mine which maintains its preset distance below the surface irrespective of the rise and fall of tides.
Oscillating mouid table, английский
Качающийся стол кристаллизатора мнлз
Oscillating platform, английский
Башенное морское основание, шарнирно крепящееся к дну
Oscillating system, английский
Oscillating value, английский
Oscillating warning lamp, английский
Lamp in which the beam or beams oscillate through fixed angles. otto cycle the four stroke spark ignition engine cycle, patented in 1876, comprising induction (intake), compression, expansion (power), and exhaust strokes, the fuel and air mixture being compressed before combustion
Longitudinal, английский
- Generally parallel to the direction of the wood fibres.
- Продольный
- Generally, parallel to the direction of the wood fibers.
- Продольный, относящийся к долготе, стрингер
- [1] extending in the lengthwise direction, as distinguished from transverse. [2] said of any fore-and-aft structural member, such as a frame or bulkhead.
- Running lengthwise.
- Along the length of a structure.
- Direction parallel to the long axis of an object and perpendicular to its radius — for example, down the length of a cylinder. compare circumferential; radial; transverse. lot tolerance percent defective (ltpd): the poorest quality, in percent defective, individual lot that is acceptable in a sampling plan. ltpd is the percent defective that will be accepted by the sampling plan at most 10 percent of the time. with such a plan, the producer agrees to supply just enough nonconforming product such the consumer will accept the lot using the agreed to sampling plan and acceptable quality level. compare acceptable quality level. lumen (lm): si photometric unit of luminous flux, weighted according to the photopic vision response. one lumen equals the light emitted by one candela (cd) point source into one steradian (sr) solid angle (1 lm = 1 cd/sr).
Synchronous, английский
- Синхронный
- A data signal that is sent along with a clock signal. a system in which events, such as signals, occur at evenly spaced time durations. opposite of asynchronous. t
Parametric, английский
Параметрический
Transverse, английский
- Across. a transverse section is a section across the length of a building or room.
- Поперечный
- Directions in wood at right angles to the wood fibers
- Perpendicular to the keel (athwartship).
- Across the vessel; athwartships. trim - fore and aft balance of a boat.
- Literally, “across,” usually signifying a direction or plane perpendicular to the direction of working.
Extremities, английский
- The parts of the body at the ends of limbs, e.g. the fingers, toes, nose and ears
- The stem and stern posts of a ship.
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Rotc, английский
Reserve officer training corps (u.s.).
Rotating band, английский
See driving band.
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