DE3910552A1 - Method of reducing the turning circle of icebreakers - Google Patents

Abstract

To reduce the turning circle of icebreakers, the frames in the area of the stern shoulder are constructed in such a way that they can easily slide onto the ice. In the transition from the bottom to the side, the frames form a knuckle line which runs out from the fore towards the stern. During the rolling movement of the ship, this knuckle line cuts like a knife into the edge of the broken ice channel. Due to unbalanced contact, rolling movements are induced in the ship at its natural frequency so that it alternately moves onto the ice and then breaks the ice. The after-body can thereby move outwards and thus the turning circle can be reduced.

Description

The invention relates to a method for Verrin the turning circle of icebreaking ships due to the shape of the frames in the area of the rear Shoulder and generating a rolling motion.

When icebreaking ships move through flat ice because of that they cause one more when driving straight ahead or less ice-free channel that the straight ahead supported by the side guide. The Fortune from this channel to initiate a turning circle being able to break out is due to the shape of the bow, the Length of the ship and through the frame shape in the Area of the rear shoulder determined. The convents tional shape leads to turning circle diameter stars that are a multiple of the length of the ship can.

It is known that there are bow shapes in icebreaking ships, which make it easier to break out of the broken channel, e.g. B. Thyssen-Waas Bug. These forms of ship favor a change of direction by breaking the surface ice in the bow area. However, by initiating a rotary movement, the ship is pressed against the edge of the ice channel in the area of the rear shoulder ( Fig. 2, 3), thus preventing the rotary movement.

The invention is based, the Pres solution between the rear shoulder of the ship and to prevent the ice edge.

This object is achieved in that the frames in the area of the rear school ter form a crease line in the transition from the ground to the side, which lies above the ice surface ( Fig. 3, 2) and runs straight from front to back ( Fig. 3, 1). The unbalance system ( Fig. 5, 1) stimulates the ship to roll and cuts into the ice with the crease line, giving it the space that is required for small turning circles.

The advantages achieved with the invention exist especially in that the turning circles of eisbre ships can be significantly reduced.

An embodiment of the invention is in the Drawing shown and is closer below described. It shows

Image 1 the icebreaking ship in the ice channel at the straight exit,

Figure 2 the icebreaking ship in the ice channel when the turning circle is initiated,

Figure 3 shows the side view of the ice-breaking ship in the area of the rear shoulder,

Picture 4 the frames of the icebreaking ship in the area of the rear shoulder,

Figure 5 shows the arrangement of the unbalance system on the icebreaking ship.

When driving straight ahead, the icebreaking ship ( Fig. 1, 2) moves freely in the ice-free channel ( Fig. 1,1). When the turning circle is initiated, the icebreaking ship ( Fig. 2, 6) is set into a rolling motion by the unbalance system ( Fig. 5, 1) and the ice in the area of the rear shoulder ( Fig. 2, 3) is broken. This increases the angle β ( Fig. 2.1) between the rail tangent ( Fig. 2.5) and the ship's longitudinal axis when driving straight ahead ( Fig. 2.4) and thus reduces the turning circle diameter.

Claims (3)

1. A method for reducing the turning circle of ice-breaking ships in particular characterized in that the frames are designed in the area of the rear shoulder so that they can easily slide onto the ice, and the ship is excited to roll movements. 2. The method according to claim 1, characterized in that the rolling movements by an unbalance system can be generated. 3. The method according to claim 1, characterized in that the speed of the Un balancing system can be regulated so that the Rollei frequency of the ship can be excited.