Figure 7 - uploaded by Uğursal Demir
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Source publication
In addition to the basic classification rules that must be taken into account during the design, products and purchase of a
marine vessel; it is seen that the measures to increase comfort and safety have gained more importance in recent years.
The engineering design of a boat has been conveyed to the customers as an advantage by the mass production...
Contexts in source publication
Context 1
... in +x and +y directions: Figure 7 gives an outline of the gyro stabilization system. Based on the principles outlined in Chapter 2, free axes, In order to balance ship yaw and trim motions for gyroscopic effects, ARG systems have to produce opposite moments by operating at a certain power. ...
Context 2
... in +x and +y directions: Figure 7 gives an outline of the gyro stabilization system. Based on the principles outlined in Chapter 2, free axes, In order to balance ship yaw and trim motions for gyroscopic effects, ARG systems have to produce opposite moments by operating at a certain power. ...
Citations
... Vertical spinning cylinders, such as Flettner rotors, induce a gyroscopic effect which may affect the dynamic stability of a ship. Gyrostabilizer devices (Demir, 2020) utilizing this effect have been developed in order to reduce the motion of leisure vessels. Perez and Steinmann (2009) investigated the roll damping characteristics of a gyro stabilizer control system using a numerical model combining the vessel and a gyrostabilizer. ...
This paper deals with the seakeeping of a catamaran propelled by Flettner rotors. The case study is an energy ship. The prediction of the roll motion of such a ship is of particular interest since she will mostly sail in beam seas. We used a numerical model based on the boundary element method to deal with the interactions of the ship with waves. It is supplemented by a model for the aerodynamic damping effect due to the rotors, the gyroscopic effects from the rotors and by the ITTC correction for roll damping. In the present study, it has been assumed that the Flettner rotors can be modelled as a distribution of elementary airfoils whose lift and drag depend on the local apparent wind speed. Interaction effects between the rotors and between the hull and rotors have been neglected. Regular waves have been investigated. For the considered case study, it is found that the Flettner rotors can have a small destabilizing effect or a small stabilizing effect on the ship motion depending on the ship speed and the rotors’ rotational speed.
