Determining water speed of ships
Establishing the delivered power needed as a function of the ship's speed in relation to the water
Michael Atsma (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Kees Vuik – Mentor (TU Delft - Numerical Analysis)
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Abstract
In this thesis, we look at the traditional way of calculating a ship’s Power-Speed function using the Iterative Method, and then compare this to the renewed method created by Michaël Mersie, called the Direct Method. We find that, only under very specific circumstances, the Iterative Method can be slightly better at estimating the function of the contribution of the water current. In all of these circumstances, except for one case, the Direct Method is still better at estimating the Power-Speed function than the Iterative Method. All the other times, the Direct Method outperforms the Iterative Method in both functions. In addition, we look at a way to try to solve the diverging situations for the Iterative Method. An instance of the Mean of Means Method gives a clear advantage in converging situations, though not necessarily solves diverging situations.