This chapter aims to derive complementary models for environmental disturbances. The three external loads on a marine craft are: wind, waves, and ocean currents. An accurate description of the environmental forces and moments are important in vessel simulators that are produced for human operators. Mathematical models of wind forces and moments are used in motion control systems to improve the performance and robustness of the system in extreme conditions. Wave forces are observed as a mean slowly‐varying component and an oscillatory component, which need to be compensated differently by a feedback control system. The chapter describes wave force models that can be used for prediction, observer‐based wave filtering and testing of feedback control systems in the presence of waves. Ocean currents are horizontal and vertical circulation systems of ocean waters produced by gravity, wind friction and water density variation in different parts of the ocean.
Environmental Forces and Moments
2021-06-01
45 pages
Article/Chapter (Book)
Electronic Resource
English
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