Arched beam structure with variable arc length

Abstract

The invention belongs to the technical field of flexible structure design, and particularly relates to a variable-arc-length arched beam structure which comprises a sliding groove section, a sliding key section, a corrugated beam, a variable-height supporting column and a variable-length supporting rod. The corrugated beams are arranged on the outer sides of the sliding key sections and the sliding groove sections and are provided with wave crest and wave trough structures; the sliding key sections and the sliding groove sections are located on the inner sides of the corrugated beams, arranged at intervals and distributed in a staggered mode. The corrugated beams, the sliding key sections and the sliding groove sections are all of arc-shaped structures, and wave crests and wave troughs of the corrugated beams are arranged in the radial direction of the arc-shaped structures; when the shape and the arc length of the arched beam are changed, the variable-height supporting columns and the variable-length supporting rods can automatically generate height changes, then the sliding key sections and the sliding groove sections are driven to relatively slide, and meanwhile the corrugated beams evenly distribute the arc length changes to the positions between the adjacent wave crests, so that external loads are evenly distributed to the arched beam. Therefore, the size of the fuselage is correspondingly reduced along with fuel consumption.

Description

Technical Field

[0001] The present application belongs to the technical field of flexible structure design, and in particular relates to an arched beam structure with variable arc length. Background Art

[0002] To balance extending range and reducing flight resistance, many round-trip aircraft require a larger fuselage space to carry more fuel at departure. As fuel is consumed, the fuselage size can be reduced accordingly, reducing flight resistance and improving fuel efficiency. This has led to a demand for a deformable fuselage structure. Currently, research on deformable aircraft structures has focused on wing deformation, with limited research on fuselage deformation. Fuselage structures are typically elliptical or circular, with arc length increasing as distance from the center increases.

[0003] Due to the excellent bearing capacity of arched beams, they are highly favored by structural designers. Therefore, how to design a variable arc length structure is a problem that needs to be solved. Summary of the Invention

[0004] The purpose of the present application is to provide an arched beam structure with a variable arc length to solve the problem in the prior art that it is difficult to reduce the fuselage size accordingly with fuel consumption.

[0005] The technical solution of the present application is: an arched beam structure with variable arc length, comprising a slide groove section, a sliding key section, a corrugated beam, a variable height support column, and a variable length support rod; the corrugated beam is arranged outside the sliding key section and the slide groove section, and the corrugated beam has a wave crest and wave trough structure; the sliding key section and the slide groove section are located inside the corrugated beam and are arranged at intervals, and the sliding key section and the slide groove section are staggered; the corrugated beam, the sliding key section, and the slide groove section are all arc structures, and the wave crests and wave troughs of the corrugated beam are arranged along the radial direction of the arc structure;

[0006] The sliding key section and the sliding groove section are nested with each other to form an arc-shaped support slide, and the trough of the corrugated beam slides in the arc-shaped support slide; the variable height support column and the variable length support rod are respectively hinged to the two ends of the sliding groove section; the variable height support column and the variable length support rod can both be adjusted in height, and the adjustment direction is the radial direction of the arc-shaped support slide.

[0007] Preferably, the cross section of the sliding key section is dovetail-shaped, and a dovetail groove cooperating with the sliding key section is provided in the middle of the sliding groove section; reinforcing ribs are provided on the upper bottom surfaces of the sliding key section and the sliding groove section.

[0008] Preferably, the reinforcing ribs of the sliding key section and the sliding groove section are respectively distributed in the middle and on both sides, and the upper bottom surfaces of the sliding key section and the sliding groove section are in the same plane, forming a supporting slide rail that can slide with the corrugated beam; a supporting pulley is provided at the position of the trough of the corrugated beam corresponding to the supporting slide rail; each trough of the corrugated beam slides on the supporting slide rail through the supporting pulley.

[0009] Preferably, the supporting pulley includes a pulley seat and a sliding roller. There are three groups of sliding rollers, each corresponding to three groups of reinforcing ribs. An axle is connected between adjacent sliding rollers. The sliding roller located in the middle is arranged corresponding to the supporting slide rail on the sliding key section. The upper end of the pulley seat is bolted to the corrugated beam, and the lower end is slidably matched with the axle of the sliding roller.

[0010] Preferably, a fork ear is provided at the lower end of the pulley seat, a slot is provided on the fork ear, and the slot is connected to the wheel axle; and the length of the upper end of the pulley seat is greater than the width of the corrugated beam, and the width is greater than the diameter of the sliding roller; the arc end surface of the fork ear has a gap with the upper surface of the slide groove section or the slide key section, and is lower than the upper surface of the slide groove section and the slide key section.

[0011] Preferably, the arc-shaped supporting slide includes 4 slide groove sections and 3 slide key sections, the length of the slide groove section is L, the length of the slide key section is 1.5 times the length of the slide groove section, each slide key section is nested by 0.5L on both sides of the adjacent slide groove sections, and the length not nested in the slide groove section is 0.5L.

[0012] The variable-arc-length arched beam structure of this application, when the shape and arc length of the arched beam change, the variable-height support column and variable-length support rod automatically change height, thereby driving the sliding key section and the slide groove section to slide relative to each other. Simultaneously, the corrugated beam evenly distributes the arc length change between adjacent wave crests, thereby evenly distributing external loads across the arched beam. This allows both the arched beam and arc length to be variable, better adapting to changes in structural shape, while also evenly distributing external loads across the arched beam. This resulting arc length change allows the fuselage size to be reduced accordingly with fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0014] Figure 1 This is a schematic diagram of the overall structure of this application;

[0015] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0016] Figure 3 This is an exploded structural cross-sectional view of the chute section and the sliding key section of this application;

[0017] Figure 4 This is a cross-sectional view of the connection structure between the chute section and the sliding key section of this application;

[0018] Figure 5 This is a schematic diagram of the connection structure between the support pulley and the corrugated beam of this application;

[0019] Figure 6 This is a schematic diagram of the support pulley connection structure of this application.

[0020] 1. Slide groove section; 2. Slide key section; 3. Corrugated beam; 4. Variable height support column; 5. Variable length support rod; 6. Support slide rail; 7. Support pulley; 8. Pulley seat; 9. Sliding roller; 10. Wheel axle; 11. Fork ear. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] An arched beam structure with variable arc length, such as Figure 1-Figure 2 , including a chute section 1, a sliding key section 2, a corrugated beam 3, a variable height support column 4 and a variable length support rod 5. The corrugated beam 3 is arranged on the outside of the sliding key section 2 and the chute section 1, and the corrugated beam 3 has a wave crest and trough structure; the sliding key section 2 and the chute section 1 are located on the inside of the corrugated beam 3 and are arranged at intervals, and the sliding key section 2 and the chute section 1 are staggered; the corrugated beam 3, the sliding key section 2 and the chute section 1 are all arc-shaped structures, and the crests and troughs of the corrugated beam 3 are arranged along the radial direction of the arc structure. The variable length support rod 5 is a nested telescopic structure driven by hydraulic pressure and does not provide lateral support stiffness. The axis direction of the variable length support rod 5 can be changed when it is extended, which is an existing design.

[0023] The key segment 2 and the chute segment 1 nest together to form an arc-shaped support slideway, along which the troughs of the corrugated beam 3 slide. A variable-height support column 4 and a variable-length support rod 5 are hinged to the ends of the chute segment 1. Both the variable-height support column 4 and the variable-length support rod 5 are height-adjustable in the radial direction of the arc-shaped support slideway. By adjusting the length of the variable-length support rod 5, the ends of each chute segment 1 are aligned on the same arched contour line.

[0024] When the shape and arc length of the arched beam change, the variable-height support column 4 and variable-length support rod 5 automatically change height, driving the sliding key section 2 and the chute section 1 to slide relative to each other. Simultaneously, the corrugated beam 3 evenly distributes the arc length change between adjacent wave crests, evenly distributing external loads across the arched beam. This allows the arched beam to vary in both height and arc length, better adapting to changing structural shapes and ensuring uniform distribution of external loads across the arched beam.

[0025] The variable height support column 4 and the variable length support rod 5 can preferably adopt an actuator cylinder or an electric push rod. When the arch beam deforms outward, the sliding key section 2 and the slide groove section 1 move away from each other; when the arch beam deforms inward, the sliding key section 2 and the slide groove section 1 move closer to each other; thereby causing the arc length to change, so that the fuselage size is reduced accordingly with fuel consumption.

[0026] like Figure 3-Figure 4 Preferably, the cross-section of the key segment 2 is dovetail-shaped, and a dovetail groove is defined in the middle of the chute segment 1 to mate with the key segment 2. Ribs are provided on the upper bottom surfaces of both the key segment 2 and the chute segment 1 to enhance strength. The two sides of the dovetail are connected at the exact middle of the length of the chute segment 1. The cross-sectional stiffness of the chute segment 1 and the key segment 2 must be controlled to allow for a certain degree of elastic deformation during the shape change of the arched beam. For example, aluminum alloy should be used to ensure smooth sliding between the chute segment 1 and the key segment 2.

[0027] The corrugated beam 3 is formed by bending a long strip of metal plate. The crests and troughs of the corrugated beam 3 have similar structures, and the length of the corrugated beam 3 is variable. The reinforcing ribs of the key section 2 and the chute section 1 are respectively distributed in the middle and on both sides. The upper and lower surfaces of the key section 2 and the chute section 1 are in the same plane, forming a support rail 6 that can slide with the corrugated beam 3. Support pulleys 7 are provided at the positions of the troughs of the corrugated beam 3 corresponding to the support rail 6. Each trough of the corrugated beam 3 slides on the support rail 6 via the support pulley 7. The corrugated beam 3 evenly distributes the changes in the arc length of the arc-shaped support rail 6 to the arc surface formed by the crests. The arc length on the crest surface deforms uniformly, and the out-of-plane load of the variable arc length arched beam is evenly distributed on the arched beam.

[0028] like Figure 5-Figure 6 Preferably, the support pulley 7 includes a pulley seat 8 and sliding rollers 9. There are three groups of sliding rollers 9, each corresponding to one of the three sets of reinforcing ribs. An axle 10 is connected between adjacent sliding rollers 9. The middle sliding roller 9 is positioned corresponding to the support rail 6 on the slide key section 2. The upper end of the pulley seat 8 is bolted to the corrugated beam 3, and the lower end slides in engagement with the axle 10 of the sliding roller 9. When the position of the corrugated beam 3 changes, the position of the pulley seat 8 also changes, thereby driving the three groups of sliding rollers 9 to slide on the slide key section 2 and the chute section 1 via the axle 10, achieving a uniform change in arc length.

[0029] Preferably, a fork ear 11 is provided at the lower end of the pulley seat 8, and a slot is opened on the fork ear 11, and the slot is connected to the wheel axle 10; and the length of the upper end of the pulley seat 8 is slightly larger than the width of the corrugated beam 3, and the width is slightly larger than the diameter of the sliding roller 9; the arc end surface of the fork ear 11 has a certain gap with the upper surface of the chute section 1 or the sliding key section 2, and is lower than the upper surface of the chute section 1 slide and the sliding key section 2 slide, so as to ensure smooth cooperation between the corrugated beam 3 and the sliding key section 2 and the chute section 1.

[0030] Preferably, the arc-shaped supporting slide includes 4 slide groove sections 1 and 3 slide key sections 2, the length of the slide groove section 1 is L, the length of the slide key section 2 is 1.5 times the length of the slide groove section 1, wherein each slide key section 2 is nested by 0.5L of the adjacent slide groove sections 1 on both sides, and the length not nested in the slide groove section 1 is 0.5L; when deformed to the maximum arc length, each slide key section 2 slides out of the slide groove section 1 by 0.3L, and the end of the slide key section 2 overlaps the slide groove section 1 by 0.2L.

[0031] The variable-height support column 4 and variable-length support rod 5 are respectively supported at one end of the two chute sections 1 nested within the middle sliding key section 2. The other ends of these two chute sections 1 are supported by the variable-length support rod 5. When the variable-height support column 4 is extended to its maximum length, the middle sliding key section 2 slides out of each of the two chute sections 1 by 0.3L. The other two chute sections 1 are supported at one end by the variable-length support rod 5, while the other ends are fixed to the base structure. There are four variable-length support rods 5 in total. The length of the variable-length support rods 5 is adjusted so that the two ends of each chute section 1 are aligned with the contour line of the variable arch.

[0032] In a specific example, the shape of the arch beam is approximately an arc, with a corresponding central angle of 70° and a curvature radius R of 1.35 meters; the arc support slide of the variable arc length arch beam is raised to form a new variable arch, and the highest point in the middle of the maximum variable arch is 0.35 meters higher than the corresponding point of the basic arch; the arc support slide is composed of 4 slide sections 1 and 3 slide key sections 2, the length L of a single slide section 1 is 0.3 meters, and the length 1.5L of the slide key section 2 is 0.45 meters, corresponding to the arc length of the basic arch 5.5L (1.65 meters); when deformed to the maximum variable arch, each slide key section 2 slides out 0.3L from the adjacent slide sections 1 on both sides, and the entire arc length becomes 7.3L (2.19 meters); the arc length of other intermediate states is determined according to the length of the slide key section 2 sliding out of the slide section 1 in proportion.

[0033] according to Figure 1 An arc-shaped support slide with a deformable arch beam is arranged. The arc-shaped support slide consists of four 0.3-meter-long slide trough sections 1 and three 0.44-meter-long slide key sections 2. When in the basic arch shape, the two ends of the slide key section 2 are nested in the adjacent slide trough section 1 for 0.145 meters respectively, and the unnested length is 0.15 meters. The arc-shaped support slide is 1.65 meters long. Variable-length support rods 5 and variable-height support columns 4 are arranged between the arc-shaped support slide and the basic structure. The variable-height support columns 4 and the variable-length support rods 5 must have sufficient deformation stroke.

[0034] The length of the sliding key section 2 is 0.44 meters, the cross section is trapezoidal, and the cross section shape is Figure 3, the upper bottom width is 15 mm, the lower bottom width is 25 mm, and the height is 20 mm. The chute section 1 is 0.3 meters long and matches the cross-section of the sliding key section 2. The bottom edge is 45 mm wide and 30 mm high. It is processed with sheet metal technology or profiles and closed at the bottom edge. In the middle of the length direction of the chute section 1 (0.15 meters from the end), a 10 mm wide strip is used to connect the two sides of the dovetail groove. The slideway of the sliding key section 2 is 5 mm high and 10 mm wide, and the slideway of the chute section 1 is 5 mm high and 8 mm wide. The position is adapted to the sliding roller 9. It is necessary to control the cross-sectional stiffness of the chute section 1 and the sliding key section 2, and to produce a certain elastic deformation during the change of the fuselage frame shape.

[0035] The corrugated beam 3 is made of a steel strip with a thickness of 2 mm and a width of 15 mm, and is made into a continuous sinusoidal wave with a wave height of 15 mm and a wavelength of 20 mm. The total length is 1.65 meters. The corrugated beam 3 slides on the support slide through the support pulley 7. The support pulley 7 is 20 mm long and 13 mm wide. The height from the axis of the fork ear 11 to the upper end face is 12 mm. The 3 mm notch on the fork ear 11 is adapted to the shaft of the sliding roller 9. The fork ear 11 is 3 mm thick. The gap between the arc end face of the fork ear 11 and the upper surface of the slide groove section 1 (slide key section 2) is 3 mm. The curved surface of the upper end face of the support pulley 7 is adapted to the trough surface of the corrugated beam 3. The corrugated beam 3 and the support pulley 7 are connected with M3 screws (see Figure 4 The sliding roller 9 has a diameter of 10 mm, a length of 12 mm in the middle portion, and a length of 9 mm on both sides. The diameter of the intermediate wheel shaft 10 is 3 mm, and the roller is processed using a 40 mm long 10 mm diameter cylinder.

[0036] Variable-length support rods 5 and variable-height support columns 4 are arranged between the base structure and the slide section 1 of the arc-shaped supporting slide. One end of the four variable-length support rods 5 is hinged to one end of the slide section 1, and the other end is hinged at the corresponding position of the base structure. The angles between the axis of the support rod and the line connecting the highest point in the middle of the supporting slide arc to the center of curvature of the arc are ±16.25° and ±22.75° respectively; two variable-height support columns 4 are used to support the two slide sections 1 nested with the middle sliding key section 2, one end of the support column is hinged to one end of the slide section 1, and the other end is fixed at the corresponding position of the base structure. The support column is raised along its own axis. When the arc-shaped supporting slide is lifted to the highest position (lifted 0.35 meters), the middle sliding key section 2 slides out 0.3L (0.09 meters) from the adjacent slide section 1, and the length of the variable-length support rod 5 is adjusted so that the two ends of each slide section 1 are on the contour line of the variable arch.

[0037] Finally, it should be noted that the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the present invention can be combined with each other.

[0038] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An arched beam structure with variable arc length, characterized by: The invention comprises a chute section (1), a sliding key section (2), a corrugated beam (3), a variable height support column (4) and a variable length support rod (5); the corrugated beam (3) is arranged on the outside of the sliding key section (2) and the chute section (1), and the corrugated beam (3) has a wave crest and wave trough structure; the sliding key section (2) and the chute section (1) are located on the inside of the corrugated beam (3) and are arranged at intervals, and the sliding key section (2) and the chute section (1) are staggered; the corrugated beam (3), the sliding key section (2) and the chute section (1) are all arc structures, and the wave crest and wave trough of the corrugated beam (3) are arranged along the radial direction of the arc structure; The sliding key section (2) and the chute section (1) are nested with each other to form an arc-shaped support slideway, and the trough of the corrugated beam (3) slides in the arc-shaped support slideway; the variable height support column (4) and the variable length support rod (5) are respectively hinged to the two ends of the chute section (1); the variable height support column (4) and the variable length support rod (5) can both be adjusted in height, and the adjustment direction is the radial direction of the arc-shaped support slideway.

2. The variable arc length arched beam structure according to claim 1, wherein: The cross section of the sliding key section (2) is dovetail-shaped, and a dovetail groove cooperating with the sliding key section (2) is provided in the middle of the sliding groove section (1); and reinforcing ribs are provided on the upper bottom surfaces of the sliding key section (2) and the sliding groove section (1).

3. The variable arc length arched beam structure according to claim 2, wherein: The reinforcing ribs of the sliding key section (2) and the sliding groove section (1) are respectively distributed in the middle and on both sides; the upper bottom surfaces of the sliding key section (2) and the sliding groove section (1) are in the same plane, forming a supporting slide rail (6) that can slide with the corrugated beam (3); a supporting pulley (7) is provided at the position of the supporting slide rail (6) corresponding to the trough of the corrugated beam (3); each trough of the corrugated beam (3) slides on the supporting slide rail (6) through the supporting pulley (7).

4. The variable arc length arched beam structure according to claim 3, wherein: The supporting pulley (7) comprises a pulley seat (8) and a sliding roller (9). There are three groups of sliding rollers (9) corresponding to three groups of reinforcing ribs respectively. A wheel axle (10) is connected between adjacent sliding rollers (9). The sliding roller (9) located in the middle is arranged corresponding to the supporting slide rail (6) on the sliding key section (2); the upper end of the pulley seat (8) is bolted to the corrugated beam (3), and the lower end is slidably matched with the wheel axle (10) of the sliding roller (9).

5. The variable arc length arched beam structure according to claim 4, wherein: The lower end of the pulley seat (8) is provided with a fork ear (11), and a slot is formed on the fork ear (11), and the slot is connected to the wheel shaft (10); and the length of the upper end of the pulley seat (8) is greater than the width of the corrugated beam (3), and the width is greater than the diameter of the sliding roller (9); the arc end surface of the fork ear (11) has a gap with the upper surface of the chute section (1) or the sliding key section (2), and is lower than the upper surface of the chute section (1) slideway and the sliding key section (2) slideway.

6. The variable arc length arched beam structure according to claim 2, wherein: The arc-shaped supporting slideway comprises four slide groove sections (1) and three slide key sections (2), the length of the slide groove section (1) is L, the length of the slide key section (2) is 1.5 times the length of the slide groove section (1), wherein each slide key section (2) is nested by 0.5L in the slide groove sections (1) adjacent on both sides, and the length not nested in the slide groove section (1) is 0.5L.

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