We present an adaptive scheme for real-time simulating irregular long crest waves in multi-channel marine simulator. The method restricts computations to the visible part of the ocean surface in each view channel, adapts the geometric resolution to the viewing distance and only considers the visible waves wavelengths. The method allows the user to move over an unbounded ocean following the own-ship, and immersed in a real-time updated photo-realistic ocean environment.
With the development of social economy, my country's marine industry has also made considerable progress, and the trend of large-scale ships has become increasingly obvious. In recent years, people have paid more and more attention to the maneuverability of large ships, especially whether large ships can navigate safely in restricted waters. In order to ensure the navigation safety of large ships in restricted waters, this article analyzes the characteristics of restricted waters and the maneuverability of large ships themselves, and analyzes the causes of some maritime accidents. It points out the navigation risks of large ships in restricted waters and proposes safe navigation. Countermeasures: Reasonably adjust the speed and timing of rudder use; maintain a reasonable quay wall distance; maintain a reasonable draught difference; make careful sailing preparations.
For developed irregular waves, wave heights or wave amplitudes are gained using the wave spectrums. Based on the hypothesis of Froude-Krylov, ship shape is predigested box. Wave forces and moments to ship motion can be calculated. They are added in the motion mathematical models, and ship six degrees of freedom mathematical models are given. Using the fourth order Runge -Kutta integration method solves differential equations. The mathematical models are applied to Full Mission Ship Handling Simulator. Six degrees of freedom of the ship: the location, attitude and speed and acceleration are passed to the other modules in the navigation simulator, in order to achieve interaction between human and computer. As an example, a cargo ship that its displacement is ten thousand tons are simulated in three sea states, the time histories of motion are good and the viewing scene is very vivid. The results are shown that the mathematical models can meet the engineering demands.
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