DE102019217749A1 - Fin stabilizer - Google Patents

Abstract

The invention relates to a fin stabilizer (10) for the roll stabilization of a ship (12) in motion, at anchor or at zero speed with a fin shaft (20) which also forms a fin shaft (18) with a drive device (22) for rotating a fin (24). 100, 102, 104) about a fin shaft axis (26) for changing an angle of attack (γ) of the fin (24, 100, 102, 104) in the water (14) and with a pivoting device (40) with a pivoting column (42) for a Angular movement of the fin (24, 100, 102, 104) and fin shaft (20) about a pivot axis (46) running essentially vertically and at right angles to a ship's longitudinal axis (44) for pivoting the fin (24, 100, 102, 104) in and out ) into an operating position outside and into a rest position inside an associated fin case (50) inside the ship (12), the fin (24, 100, 102, 104) having the shape of an elongated polygon (70). According to the invention, it is provided that the fin shaft axis (26) starts from an inner edge (80) of the fin (24, 100, 102, 104) and an imaginary extension (92) of the fin shaft axis (26) at an exit point (P, P ', P' ', P' '') exits from a leading edge (82) of the fin (24, 100, 102, 104), a distance (A) of the exit point (P, P ', P' ', P' '') from an outer edge (86 ) of the fin (24, 100, 102, 104) based on a total length (L, L ') of the leading edge (82) of the fin (24, 100, 102, 104) is between 0% and 75%. As a result, an optimized Damping of the rolling movement of the ship (12) when traveling through the water (14), at anchor or at zero speed or at zero travel.

Description

The invention relates to a fin stabilizer for the roll stabilization of a ship in motion, at anchor or at zero speed with a flipper shaft which also forms a fin shaft with a drive device for rotating a fin around a fin shaft axis to change the angle of the fin in the water and with a swivel device with a swivel column for an angular movement of the fin and fin shaft around a pivot axis running essentially vertically and at right angles to a ship's longitudinal axis for pivoting the fin out and in into an operating position outside and into a rest position inside an associated fin case inside the ship, the fin being in the shape of an elongated polygon having.

Fin stabilizers for passenger ships, larger yachts, floating pontoons and the like are known in a wide range of variations from the prior art. Square fin shapes are generally used here. With the square fin types, in order to optimize the hydrodynamically effective fin surface for roll stabilization at anchor or at zero speed of the ship, the aim is to position the fin shaft as close as possible to the front fin edge.

From the EP 2 565 116 B1 is a device for roll stabilization of ships with a raft-carrying shaft known as a fin shaft.

The device comprises, inter alia, a drive device for rotating a fin around the axis of the fin shaft in order to change the angle of attack of the fin in relation to the horizontal. The fin has the shape of an elongated square with short and long sides. Furthermore, a pivoting device is provided for an angular movement of the fin and fin shaft around a pivot axis of a pivoting column, which runs essentially vertically and at right angles to the ship's longitudinal direction, for pivoting the fin in and out into an operating position outside and into a rest position in an associated fin pocket inside the ship.

The fin is oriented with its short side facing the ship's outside in the operating position approximately parallel to the ship's outer skin, and the long sides of the fin have a sweep angled backwards in the direction of travel or in the direction of a stern of the ship. The fin shaft axis is arranged in an area of 10 to 30% of a mean chord length of the fin with a central span, the pivoting movement of the pivoting column from the operating position to the rest position according to the arrow being greater than 90 ° to accommodate the fin in the fin pocket.

One object of the invention is to provide a fin stabilizer for a watercraft which enables an improved stabilizing effect with respect to rolling movements of a ship while moving, at anchor or at zero speed.

The above-mentioned object is achieved in that the fin shaft axis starts from an inner edge of the fin and an imaginary extension of the fin shaft axis emerges at an exit point from a leading edge of the fin, a distance of the exit point from an outer edge of the fin based on a total length of the leading edge of the Fin is between 0% and 75%. As a result, there is an optimized damping of the roll movements of the ship in motion or at anchor. The distance is particularly preferably in a range between 0% and 25% or between 35% and 75% based on the total length of the leading edge of the fin. At a distance of the point from the outer edge of the fin that is 0% in relation to the total length of the front edge, for example, an approximately parallelogram-shaped fin results, while the fin at 75% has a geometry that corresponds to that of an oblique trapezoid. In the context of this description, the term zero speed or zero travel defines that the non-propelled ship does not make any active travel through the water, although it can drift along with any current in the water above the ground.

The distance is preferably in a range between 0% and 25% or between 35% and 75%, in each case based on the total length of the leading edge of the fin.

As a result, there is optimal space and an excellent damping effect of the fin stabilizer.

A pivot angle of the fin from the rest position to the operating position is preferably greater than 90 °.

This ensures that the fin can be pivoted completely out of the fin case.

In a technically advantageous embodiment, the fin is essentially flush with a hull of the ship in the rest position.

As a result, the flow resistance can be minimized when the ship is in motion. In addition, damage to the fin when driving through ice is minimized.

A sweep of the fin in the direction of travel is preferably up to 60 °.

This allows the space for the fin box to be minimized.

In the case of a further embodiment, the fin shaft axis runs essentially perpendicular to the longitudinal axis of the ship in the operating position.

Because of this, the forces acting on the fin for roll damping can be optimally transferred to the ship's structure.

In the case of a further alternative embodiment, the fin shaft axis in the operating position runs essentially at an angle of less than 90 degrees to the longitudinal axis of the ship. The fin shaft axis is set in the direction of travel of the ship.

Because of this, the forces acting on the fin for roll damping not only cause a torque to be supported on the pivoting device, but are reduced by axial forces or shear forces that are transmitted to the pivoting device along the fin shaft.

In an advantageous development it is provided that an inner edge and / or the front edge and / or an outer edge and / or a rear edge of the fin have at least one kinked section.

This results in a further scope for design with regard to the geometry of the polygonal fin.

In the following, a preferred embodiment of the invention is explained in more detail with reference to schematic figures.

• 1 eine schematische Draufsicht auf den Flossenstabilisator in einer Ruhestellung, und
• 2 eine schematische Draufsicht auf den Flossenstabilisator in einer Betriebsstellung.

Show it

• 1 a schematic top view of the fin stabilizer in a rest position, and
• 2 a schematic plan view of the fin stabilizer in an operating position.

The 1 shows a schematic plan view of the fin stabilizer in a rest position.

A fin stabilizer 10 for roll stabilization of a ship only hinted at 12th in motion through water 14th , at anchor or at zero speed includes, among other things, one as a fin shaft 20th trained raft-carrying shaft 18th with a drive device 22nd for twisting a fin 24 around a fin shaft axis 26th or a longitudinal center axis of the shaft 18th to change an angle of attack of the fin 24 in the incoming water 14th (see. 2 ; Reference number γ ). The ship 12th has a fuselage 28 with a hull skin 30th , a bug 32 and a heck 34 and thus moves against the direction of the incoming water during normal (forward) travel 14th holding an arrow 36 is illustrated by the water 14th . The movement of the ship 12th thus takes place within the plane of the drawing from left to right and in one direction of travel F. .

The fin stabilizer also has 10 via a swivel device 40 with a massive swivel column 42 for an angular movement of fin 24 and fin shaft 20th around an essentially vertical and perpendicular to a ship's longitudinal axis 44 running swivel axis 46 for swiveling the fin in and out 24 into an operating position outside and into a rest position inside an associated fin case 50 that is in the fuselage 28 of the ship 12th is integrated. The pivot axis 46 runs essentially perpendicular to a preferably planar fin box base 52 .

In the in 1 shown rest position of the fin stabilizer 10 closes the fin 24 outside essentially flush with a fin box opening 54 inside the trunk 28 of the ship 12th off, that is, the fin 24 is practically completely in the fin case 50 recorded. In the rest position of the fin stabilizer 10 is thus a noticeable increase in the ship's drag 12th when driving through the water 14th avoided. There will also be damage to the fin 24 in the case of a voyage by the ship 12th avoided by ice. Both the drive device 22nd as well as the swivel device 40 are preferably implemented with high-torque electro-hydraulic drives.

The fin 24 has a circumferential geometry that is essentially that of an elongated polygon 70 corresponds. The polygon 70 is only exemplary here as a general square 72 designed with four edges and four corners, not designated, for the sake of better graphical representability. The fin shaft axis 26th the fin 24 is based on the rest position shown here with the aid of an electro-hydraulic swivel device, for example 40 by a swivel angle α of preferably greater than 90 ° about the pivot axis 46 pivotable.

The 2 illustrates a schematic top view of the fin stabilizer in an operating position.

The hull 28 of the ship 12th with the bow 32 and the stern 34 moves analogously to the representation of 1 against the direction of the arrow 36 through the water 14th , that is, in the normal (forward) direction of travel F or is from the water 14th in the direction of the arrow 36 flowed towards. The hull 28 of the ship 12th has the fuselage skin 30th that are essentially flush with the fin case opening 54 concludes. Inside the empty fin case 50 of the fin stabilizer 10 as well as substantially perpendicular to its fin case base 52 is the swivel device 40 with the swivel column 42 and with their substantially vertical and at right angles to the ship's longitudinal axis 44 oriented swivel axis 46 positioned. At least approximately orthogonal to the pivot axis 46 runs as a fin shaft 20th trained, raft-carrying shaft 18th . With the help of the independent of the swivel device 40 adjustable drive device 22nd is the shaft of the fin 20th co-forming, raft-carrying wave 18th and thus the fin 24 around the axis of the fin shaft 26th by an angle of attack γ in relation to the plane of the drawing or to the horizontally flowing water 14th rotatable. The angle of attack γ is preferably in a range between -60 ° and + 60 °. An arrow β the fin 24 in the normal (forward) direction F of the ship 12th through the water 14th can be up to 60 °.

In the operating position of the fin stabilizer shown here 10 is the fin 24 by a swivel angle α from about 105 ° from completely inside the fin case 50 recorded rest position by means of the pivoting device 40 from the fin case 52 swiveled out. The fin shaft axis 26th thus runs approximately at right angles to the ship's longitudinal axis 44 or to the fuselage skin 30th .

The polygonal fin 24 only has an inner edge here as an example 80 , one from the water 14th flowed leading edge 82 , an outer edge 84 as well as a trailing edge 86 . The inside edge 80 runs in the operating position shown here almost parallel and largely without gaps to the fuselage skin 30th of the ship 12th and the outer edge 84 in turn runs essentially parallel to the inner edge 80 . The arrow β is preferred on the leading edge 82 the fin 24 provided, but can alternatively or additionally also on the rear edge 86 the fin 24 be trained.

An imaginary extension 92 the fin shaft axis 26th cuts the leading edge 82 at a first exit point P , its distance A. from the outside edge 86 at about 33% - based on a total length L. the straight leading edge 82 the fin 24 - lies. This gives the fin 24 of 1 with a perimeter geometry similar to that of the polygon 70 or the square 72 corresponds to.

A second exit point P 'is at 0%, from which a first alternative fin 100 results, which has an approximately parallelogram-shaped geometry. A third exit point P ″, on the other hand, is at 70%, creating a second alternative fin 102 can be realized with an approximately triangular circumferential geometry. In the case of a fourth exit point P ''', which is located at around 75%, a third alternative fin results 104 , which has an approximately trapezoidal circumferential geometry. By varying the distance A. an exit point of the imaginary extension 92 the fin shaft axis 26th let the fins 24 , 100 , 102 , 104 realize with different geometries. The distance is preferably located A. either in a range between 0% and 25% or in an interval between 35% and 75%, each based on the total length L. the leading edge 82 the fin 24 and each including the range or interval limits.

In addition, at least the leading edge 82 of the fin 24 has at least one optional buckling section 110 or kink through which the leading edge 82 in a first section close to the fuselage 112 and a second distal section 114 is divided. The sum of the two sections 112 , 114 corresponds to one against the length L. slightly greater length L 'of the bent front edge 82 the fin 24 .

The inner edge can accordingly 80 and / or the outer edge 84 and / or the trailing edge 86 the fin 24 also have at least one kink section (not shown). The same applies to each of the alternative fins shown only by way of example 100 , 102 , 104 or fin shapes.

List of reference symbols

10

Fin stabilizer

12th

ship

14th

water

18th

raft-carrying wave

20th

Fin shaft

22nd

Drive device (angle of attack)

24

Fin (trapezoidal)

26th

Fin shaft axis

28

hull

30th

Hull skin

32

Bug

34

Rear

36

arrow

40

Swivel device (swivel movement)

42

Swivel column

44

Longitudinal axis of the ship

46

Swivel axis

50

Fin case

52

Fin case base

54

Fin case opening

70

Polygon

72

general square

80

Inside edge

82

Leading edge

84

Outer edge

86

Trailing edge

92

Extension (fin shaft axis)

100

first alternative fin (parallelogram-shaped)

102

second alternative fin (triangular)

104

third alternative fin (trapezoidal)

110

Kink

112

first section close to the fuselage

114

second section further away from the hull

A.

Distance (exit point)

F.

Direction of travel (ship)

L.

Total length (straight leading edge of the fin)

L '

Total length (leading edge of fin with kinked section)

P

first exit point

P '

second exit point

P ''

third exit point

P '' '

fourth exit point

α

Swivel angle

β

Arrow

γ

Angle of attack

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2565116 B1 [0003]

Claims (7)

Fin stabilizer (10) for the roll stabilization of a ship (12) in motion, at anchor or at zero speed with a flipper shaft (18) which also forms a fin shaft (20) with a drive device (22) for rotating a fin (24, 100, 102, 104) about a fin shaft axis (26) for changing an angle of attack (γ) of the fin (24, 100, 102, 104) in the water (14) and with a swivel device (40) with a swivel column (42) for an angular movement of the fin ( 24, 100, 102, 104) and fin shaft (20) about a pivot axis (46) running essentially vertically and at right angles to a ship's longitudinal axis (44) for pivoting the fin (24, 100, 102, 104) out and in into an operating position outside and in a rest position within an associated fin case (50) inside the ship (12), the fin (24, 100, 102, 104) having the shape of an elongated polygon (70), characterized in that the fin shaft axis (26) from egg ner inner edge (80) of the fin (24, 100, 102, 104) and an imaginary extension (92) of the fin shaft axis (26) at an exit point (P, P ', P ", P"') from a leading edge (82) of the fin (24, 100, 102, 104) exits, a distance (A) of the exit point (P, P ', P'',P''') from an outer edge (84) of the fin (24, 100, 102, 104) based on a total length (L, L ') of the leading edge (82) of the fin (24, 100, 102, 104) is between 0% and 75%. Fin stabilizer (10) Claim 1 , characterized in that the distance (A) is in a range between 0% and 25% or between 35% and 75%, in each case based on the total length of the leading edge (82) of the fin (24, 100, 102, 104) . Fin stabilizer (10) Claim 1 or 2 , characterized in that a pivot angle (α) of the fin (24, 100, 102, 104) from the rest position to the operating position is greater than 90 °. Fin stabilizer (10) Claim 1 , 2 or 3 , characterized in that the fin (24, 100, 102, 104) in the rest position is essentially flush with a hull (28) of the ship (12). Fin stabilizer (10) according to one of the Claims 1 to 4th , characterized in that an arrow (β) of the fin (24, 100, 102, 104) in the direction of travel is up to 60 °. Fin stabilizer (10) according to one of the Claims 1 to 5 , characterized in that the fin shaft axis (26) in the operating position runs essentially perpendicular to the ship's longitudinal axis (44). Fin stabilizer (10) according to one of the Claims 1 to 6th , characterized in that an inner edge (80) and / or the front edge (82) and / or an outer edge (84) and / or a rear edge (86) of the fin (24, 100, 102, 104) has at least one kink section (110 ) exhibit.

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