B - Operations – Transporting – 63 – H
Patent
B - Operations, Transporting
63
H
B63H 21/21 (2006.01) B63B 35/54 (2006.01) B63H 21/22 (2006.01)
Patent
CA 2198378
Method for optimizing the efficiency in ships with bow and stern screws as well as an arrangement for adjusting the rotation speed of the bow screw Ferries in particular may have identical drives at the bow and stern in order to avoid turning the ship when the direction of travel changes. Normally, when travelling, the rotation speed of the front screw is selected to be lower than the rotation speed of the rear screw. According to the invention, minimum-value regulation of the sum of the recorded real power levels of both drive systems is used for efficiency optimiz- ation. Is the case of the associated arrangement, a regulator (10) is provided, with the real power levels of both drives as input variables, that rotation speed of the bow screw at which the sum of the real power levels is a minumum being determined in the regulator (10).
Les ferry-boats peuvent tout particulièrement comporter des systèmes de propulsion identiques à l'avant et à l'arrière, afin d'éviter des virements de bord lors de changements de direction de marche. De manière générale, lorsque le bateau navigue, la vitesse de rotation de l'hélice avant est réglée à un niveau inférieur à celle de l'hélice arrière. Selon l'invention, pour optimiser le degré d'efficacité, la somme des puissances effectives relevées des deux systèmes de propulsion est ajustée à une valeur minimale. Dans le système prévu à cet effet, un régulateur (10) utilise les puissances effectives des deux systèmes de propulsion comme grandeurs d'entrée. La vitesse de rotation de l'hélice avant, à laquelle la somme des puissances effectives est minimale, est déterminée dans le régulateur (10).
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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