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A new identification method of four-quadrant hull manoeuvring hydrodynamics (temporarily called a "2xLT method"), as essentially based on recording the manoeuvring motions excited by two fixed-point lateral forces, is presented in detail, including the concept formulalion and simulated results (proving the method's potential). There is, namely, a significant lack of published data in this...
This contribution presents details of the ship manoeuvring simulation product used for tuning and running a hydrodynamie model of LNG carrier for real- and fast-time simulation research aimed at the nautical design of LNG off shore terminals in Poland. The input data for the model identification comes from the very detailed shipyard documentation of a quite identical ship including i.a. sea manoeuvring...
The fundamental fact about manoeuvring of geometrically similar ships, of whatever length (or size) and initial steady approach speed, including scale physical models and the whole series of full-scale ships (if they really exist), is that the nondimensional track (in ship length units), the drift angle and the nondimensional yaw velocity are maintained. The only difference is the allocation of time...
The present study compactly demonstrates the drift-nondimensional yaw correlation limit for a wide range of accelerated turning tests and zigzag tests based on manoeuvring simulation. Next, the problem of tracking an arbitrary drift angle-nondimensional yaw velocity trajectory (important in the identification of hull hydrodynamic forces) is solved by means of two differential equations with derivatives...
Benefits and limitations of onboard mooring ropes application to improve a ship manoeuvrability during berthing are discussed. A mathematical model of mooring rope forces is formulated. This has been incorporated in the general ship manoeuvring model for obtaining the real ship motions while a mooring rope is in operation. The simulation output is presented. It appears that the rotational energy absorption...
The paper presents the drift angle - nondimensional yaw velocity diagram for various manoeuvres of a single screw ship as the basic element of the hull hydrodynamics identification, optimisation, or validation. Empty regions in this chart are reported. An attempt is made to provide conditions for the arbitrary manoeuvring motion with an emphasis on filling these gaps by means of fore and aft virtual...
W artykule nakreślono stan badań w zakresie oddziaływania wiatru w modelach matematycznych manewrowania statkiem. Konieczne jest zwrócenie większej uwagi na oddziaływanie fal, zwykle silniejsze i towarzyszące wiatrowi. Podniesiono problem korekcji morskich prób manewrowych do warunków zerowych wiatru, co jest istotne przy akwizycji danych do identyfikacji modeli matematycznych ruchu. Przeanalizowano...
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