AIRCRAFT-FUSELAGE STRUCTURE

Abstract

An aircraft-fuselage structure with an external skin and reinforcement structure, supporting the external skin and includes transverse reinforcement elements and longitudinal reinforcement elements. A door opening is in the external skin, between two transverse reinforcement elements and between two longitudinal reinforcement elements, and a door arrangement is installed therein, the door arrangement having a door frame fastened in the door opening and a door panel fastened on the door frame. The door frame and/or the door panel have/has an outer surface directed towards the surroundings and having a curvature differing from curvature of the external skin adjacent to the door opening, and an adapter arrangement is on the outer surface of the door frame and/or of the door panel and, on a side directed towards the surroundings, has at least one surface element which steadily continues the curvature of the external skin adjacent to the door opening.

Claims

1. An aircraft-fuselage structure comprising: an external skin which extends along a circumferential direction and a longitudinal direction, encloses an interior and has an inner side, which is directed towards the interior, and an outer side, which is directed towards surroundings; and a reinforcement structure, which supports the external skin on the inner side and comprises a multiplicity of transverse reinforcement elements and longitudinal reinforcement elements, wherein the transverse reinforcement elements run in the circumferential direction and are spaced apart from one another in the longitudinal direction, and wherein the longitudinal reinforcement elements run in the longitudinal direction and are spaced apart from one another in the circumferential direction; wherein a door opening is in the external skin, between two transverse reinforcement elements and between two longitudinal reinforcement elements, and connects the interior to the surroundings, wherein a door arrangement is in the door opening, wherein the door arrangement has a door frame, which is fastened in the door opening, and a door panel, which is fastened on the door frame and is movable between an open position and a closed position relative to the door frame, the door frame and/or the door panel having an outer surface which is directed towards the surroundings and has a curvature which differs from a curvature of the external skin adjacent to the door opening; and an adapter arrangement fitted on the outer surface of the door frame and/or of the door panel and, on a side which is directed towards the surroundings, has at least one surface element which steadily continues the curvature of the external skin adjacent to the door opening.

2. The aircraft-fuselage structure according to claim 1, wherein the surface element is in a form of a skin element which is retained by a supporting arrangement and is supported on the outer surface of the door frame and/or of the door panel.

3. The aircraft-fuselage structure according to claim 1, wherein the adapter arrangement is formed from a different material to the door arrangement.

4. The aircraft-fuselage structure according to claim 1, wherein the adapter arrangement as a frame adapter, which is fitted on the outer surface of the door frame and, on the side which is directed towards the surroundings, has a frame-surface element which steadily continues the curvature of the external skin adjacent to the door opening.

5. The aircraft-fuselage structure according to claim 4, wherein the frame adapter has a crosspiece, which runs completely around along the door frame and, on its side which is directed towards the interior, is supported on the outer surface of the door frame and on its opposite side, which is directed towards the surroundings, retains the frame-surface element.

6. The aircraft-fuselage structure according to claim 4, wherein a gap is between the door frame and the external skin adjacent to the door opening, and wherein the frame-surface element is arranged such that it covers the gap.

7. The aircraft-fuselage structure according to claim 1, wherein the adapter arrangement has a panel adapter, which is fitted on the outer surface of the door panel and, on the side which is directed towards the surroundings, has a panel-surface element which steadily continues the curvature of the external skin adjacent to the door opening and/or of the frame-surface element.

8. The aircraft-fuselage structure according to claim 7, wherein the panel adapter has a multiplicity of supporting elements, which, on their side which is directed towards the interior, are supported on the outer surface of the door panel and on their opposite side, which is directed towards the surroundings, retain the panel-surface element.

9. The aircraft-fuselage structure according to claim 1, comprising one or more further door openings, in which one or more further door arrangements with one or more further door frames and one or more further door panels are installed, wherein one or more of the further door frames are designed with identical parts in relation to the door frame, and/or wherein one or more of the further door panels comprise identical parts in relation to the door panel.

10. An aircraft comprising the aircraft-fuselage structure according to claim 1.

11. A set of aircraft-fuselage structures of different types of aircraft, having a first aircraft-fuselage structure of a first type of aircraft and having at least a second aircraft-fuselage structure of a second type of aircraft, wherein the first aircraft-fuselage structure is in a form of an aircraft-fuselage structure according to claim 1, and wherein the second aircraft-fuselage structure comprises one or more second door openings, in which one or more second door arrangements with one or more second door frames and one or more second door panels are installed, wherein one or more of the second door frames comprise identical parts in relation to the door frame of the first aircraft-fuselage structure, and/or wherein one or more of the second door panels comprise identical parts in relation to the door panel of the first aircraft-fuselage structure.

12. A method for producing an aircraft-fuselage structure, the aircraft-fuselage structure comprising: an external skin which extends along a circumferential direction and a longitudinal direction, encloses an interior and has an inner side, which is directed towards the interior, and an outer side, which is directed towards surroundings; and a reinforcement structure, which supports the external skin on the inner side and comprises a multiplicity of transverse reinforcement elements and longitudinal reinforcement elements, wherein the transverse reinforcement elements run in the circumferential direction and are spaced apart from one another in the longitudinal direction, and wherein the longitudinal reinforcement elements run in the longitudinal direction and are spaced apart from one another in the circumferential direction; wherein a door opening is in the external skin, between two transverse reinforcement elements and between two longitudinal reinforcement elements, and connects the interior to the surroundings, wherein a door arrangement is in the door opening, wherein the door arrangement has a door frame, which is fastened in the door opening, and a door panel, which is fastened on the door frame and is movable between an open position and a closed position relative to the door frame, the door frame and/or the door panel having an outer surface which is directed towards the surroundings and has a curvature which differs from a curvature of the external skin adjacent to the door opening; and an adapter arrangement fitted on the outer surface of the door frame and/or of the door panel and, on a side which is directed towards the surroundings, has at least one surface element which steadily continues the curvature of the external skin adjacent to the door opening; wherein first the door frame and/or the door panel are installed in the door opening and then the adapter arrangement is fitted on the door frame and/or the door panel, wherein the adapter arrangement is configured such that the surface element steadily continues the curvature of the external skin adjacent to the door opening.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] An example embodiment of the disclosure herein will be explained in more detail hereinbelow with reference to a drawing, in which:

[0021] FIG. 1 shows a side view of an aircraft having a fuselage according to the disclosure herein;

[0022] FIG. 2a shows a door opening in an external skin of the aircraft of FIG. 1;

[0023] FIG. 2b shows a door arrangement, including a door panel and a door frame, suitable for installation within the door opening shown in FIG. 2a;

[0024] FIG. 2c shows the door arrangement of FIG. 2b installed within the door opening of FIG. 2a;

[0025] FIG. 3a shows the door arrangement of FIG. 2b installed within the door opening of FIG. 2a;

[0026] FIG. 3b shows an adapter arrangement for attachment to an outer surface of the door arrangement; and

[0027] FIG. 3c shows the adapter arrangement of FIG. 3b installed over the outer surface of the door arrangement.

DETAILED DESCRIPTION

[0028] FIG. 1 illustrates an aircraft 1 of a certain type. The aircraft 1 has an aircraft-fuselage structure 3 with four door openings 5two in the front region, and two in the rear region, of the aircraft 1.

[0029] The aircraft-fuselage structure 3 comprises an external skin 7 and a reinforcement structure 9 (not shown in FIG. 1). The outer skin 7 extends along a circumferential direction 11 and a longitudinal direction 13, encloses an interior 15 and has an inner side 17, which is directed towards the interior 15, and an outer side 21, which is directed towards the surroundings 19 and, during flight, is in contact with an external surround flow. The reinforcement structure 9 supports the external skin 7 on its inner side 17 and comprises a multiplicity of transverse reinforcement elements 23 in the form of ribs and a multiplicity of longitudinal reinforcement elements 25 in the form of stringers, which butt against the inner side 17 of the external skin 7. The transverse reinforcement elements 23 run in the circumferential direction 11 and are spaced apart from one another in a longitudinal direction 13, and the longitudinal reinforcement elements 25 run in the longitudinal direction 13 and are spaced apart from one another in the circumferential direction 11.

[0030] As illustrated more specifically in FIG. 2, a door opening 5 is provided (see FIG. 2a) in the external skin 7, between two adjacent transverse reinforcement elements 23 and between two adjacent longitudinal reinforcement elements 25, and connects the interior 15 to the surroundings 19. A door arrangement 27, which is shown on its own in FIG. 2b, is installed in the door opening 5, the door arrangement having a door frame 29, which is fastened in the door opening 5, on the longitudinal and transverse reinforcement elements 25, 23, and a door panel 31, which is fastened on the door frame 29 (see FIG. 2c).

[0031] As shown in FIG. 3, the door frame 29 and the door panel 31 have an outer surface 33 which is directed towards the surroundings and has a curvature which differs from the curvature of the external skin 7 adjacent to the door opening 5 (see FIG. 3a). An adapter arrangement 35 (which is shown on its own in FIG. 3b) is fitted on the outer surface 33 of the door frame 29 and of the door panel 31 and, on the side which is directed towards the surroundings 19, has at least one surface element 37 which steadily continues the curvature of the external skin 7 adjacent to the door opening 5 (see FIG. 3c).

[0032] The adapter arrangement 35 has a frame adapter 39 (see FIG. 3b), which is fitted on the outer surface 33 of the door frame 29 and, on the side which is directed towards the surroundings 19, has a frame-surface element 41, which is in the form of a skin element and steadily continues the curvature of the external skin 7 adjacent to the door opening 5. The frame adapter 39 has a crosspiece 43, which runs all the way round along the door frame 29 and, on its side which is directed towards the interior 15, is supported on the outer surface 33 of the door frame 29 and on its opposite side, which is directed towards the surroundings 19, retains the frame-surface element surface 41. A gap 45 is present, all the way round, between the door frame 29 and the external skin 7 adjacent to the door opening 5, and the frame-surface element 41 is arranged such that it covers the gap 45.

[0033] The adapter arrangement 35 also has a panel adapter 47 (see FIG. 3b), which is fitted on the outer surface 33 of the door panel 31 and, on the side which is directed towards the surroundings 19, has a panel-surface element 49, which is in the form of a skin element and steadily continues the curvature of the external skin 7 adjacent to the door opening 5 and the curvature of the frame-surface element 41. The panel adapter 47 has a multiplicity of elongate, parallel supporting elements 51, which, on their side which is directed towards the interior 15, are supported on the outer surface 33 of the door panel 31 and on their opposite side, which is directed towards the surroundings 19, retain the panel-surface element 49.

[0034] Only one door opening 5 or door arrangement 27 is illustrated in FIGS. 2 and 3. As can be seen in FIG. 1, provision is also made, in addition, for three further door openings 5 in the aircraft-fuselage structure 3, a further door arrangement 27 with a further door frame 29 and a further door panel 31 being installed in each of the three further door openings. The further door frames 29 and further door panels 31 of the further door arrangements 27 here are designed with identical parts in relation to the door frames 29 and door panels 31 of the door arrangement 27 shown in FIGS. 2 and 3, and corresponding adapter arrangements 35, as described above, adapt the curvature of the associated surface elements 37 to the curvature of the external skin 7 surrounding the respective door opening 5.

[0035] While at least one example embodiment of the present invention(s) is disclosed herein, it should be understood that modifications, substitutions and alternatives may be apparent to one of ordinary skill in the art and can be made without departing from the scope of this disclosure. This disclosure is intended to cover any adaptations or variations of the example embodiment(s). In addition, in this disclosure, the terms comprise or comprising do not exclude other elements or steps, the terms a, an or one do not exclude a plural number, and the term or means either or both. Furthermore, characteristics or steps which have been described may also be used in combination with other characteristics or steps and in any order unless the disclosure or context suggests otherwise. This disclosure hereby incorporates by reference the complete disclosure of any patent or application from which it claims benefit or priority.