A large-span continuous reinforced integral wallboard type sealed cabin shell structure

Abstract

The application discloses a large-span continuous reinforced integral wallboard type sealed cabin shell structure, belongs to the technical field of a spacecraft sealed cabin structure, and is used for providing high cabin bearing efficiency and meeting the demand of extreme light weight, comprising a frame and a wallboard, the frame and the wallboard are welded by using a friction stir welding process; the wallboard comprises a rib and a skin, and the rib and the skin are integrally formed; the rib is a continuous structure and comprises a main rib and an auxiliary rib; the main rib plays a main bearing role and can improve load transmission efficiency; the auxiliary rib is used for improving local stability; the main rib comprises a longitudinal main rib, a circumferential main rib and an inclined main rib, the longitudinal main rib and the circumferential main rib are continuous in the whole cabin, are distributed according to a load distribution condition, the inclined main rib is arranged in a column section of the whole cabin and is distributed according to a load distribution condition, the auxiliary rib is uniformly distributed between the main ribs in the whole cabin, and the whole cabin is continuous.

Description

TECHNICAL FIELD

[0001] The application relates to a large-span continuous reinforced integral wallboard type sealed cabin shell structure and belongs to the technical field of sealed cabin structures of spacecrafts. BACKGROUND

[0002] The sealed cabin is an important cabin section of a manned lunar landing vehicle, is a cabin section for astronauts to realize moon landing, moon surface work and life and moon surface takeoff and return, and the sealed cabin structure needs to simultaneously have the functions of bearing and sealing. The manned lunar landing vehicle is relatively far away from other manned spacecrafts such as space stations in an orbit, and also needs to realize moon surface takeoff, so the demand for lightweight platform is more intense.

[0003] The wallboard type sealed cabin is widely used in manned spacecrafts because of high structural efficiency and reliability, strong adaptability and the like, and the traditional wallboard type sealed cabin adopts a welding mode to weld wallboard parts, frame parts and the like into an integrated whole, wherein the wallboard is a skin reinforced structure, and the wallboard reinforcing rib is a right-angled orthogonal reinforcing rib. The above traditional sealed cabin structure has the following problems.

[0004] (1) The reinforcing rib is discontinuous in the whole cabin, there is no reinforcing rib on the connecting frame, the reinforcing rib of the wallboard is interrupted in the welding seam area, and the reinforcing rib is discontinuous in the longitudinal and circumferential directions, so that the load transmission is not direct and the structural bearing efficiency is relatively low.

[0005] (2) The cabin body skin is relatively thick, the wallboard reinforcing rib is relatively high and thick, the reinforcing rib parameters are consistent in the whole cabin, all the reinforcing ribs are high and wide, and the parameters are the same, so the reinforcing rib parameters cannot be adjusted according to the bearing and layout, and the lightweight degree is relatively low.

[0006] (3) The wallboard parameters cannot be further thinned and optimized due to the process limitation, so the demand for further optimization of the weight of the manned moon landing sealed cabin is limited.

[0007] (4) The reinforcing rib is right-angled and orthogonal, and the rib strip direction and layout cannot be changed due to the large opening of the side wall or the installation of a large load, so the load transmission efficiency is not high, and the lightweight requirement of the moon landing vehicle cannot be met.

[0008] Therefore, the problems to be solved are as follows:

[0009] (1) The moon landing cabin of the Apollo program is out of the cabin from the square cabin door at the front end of the cylindrical cabin body, and the scheme of out of the cabin from the side wall of the cabin body is more optimal to ensure the convenience of out of the cabin and the safety of astronauts. The square out-of-cabin opening needs to be arranged on the side wall of the cabin body, the opening of the side wall of the cabin body greatly weakens the overall stiffness of the sealed cabin, and the structure around the door frame needs to be designed in an integrated manner with the cabin door, so that the overall stiffness of the cabin body is ensured, the stiffness of the cabin body and the door body is matched, and the sealing performance is ensured.

[0010] (2) The sealing cabin and the propulsion cabin are connected through a pyrotechnic lock, the single-point local load of the pyrotechnic lock connection is large, reaches more than 10t, and currently there is no efficient connection method for the sealing cabin.

[0011] (3) The lunar module of the Apollo program is composed of an ascent section and a descent section, the landing legs are installed on the non-sealed descent section to realize lunar landing, in order to make the configuration more compact, it is considered not to set the ascent section and the descent section, and the landing legs are directly installed on the sealed cabin body, the landing impact load of the landing legs reaches 6t, and how to realize the installation of the landing legs on the thin-walled sealing cabin and bear the large landing impact load is a difficult problem to be solved.

[0012] (4) The sealing cabin first installs a super-large mass storage tank, the weight reaches 6t, the load during launching reaches 60t, and how the sealing cabin realizes the connection of the storage tank and bears the huge storage tank load is a difficult problem to be solved. SUMMARY

[0013] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a large-span continuous stiffening whole-wall panel type sealing cabin shell structure with high whole-cabin bearing efficiency and extreme lightweight.

[0014] The object of the present application is achieved by the following technical solutions.

[0015] In a first aspect, the present application provides a large-span continuous stiffening whole-wall panel type sealing cabin shell structure, comprising a front cone section, a first column section, a second column section and a rear cone section, and a connecting frame is arranged between the front cone section and the first column section, between the first column section and the second column section, and between the second column section and the rear cone section.

[0016] The first column section and the second column section are both wall panel structures and are respectively formed by welding a plurality of wall panel parts; the front cone section is integrally formed using a spinning process, and the rear cone section uses an integral forged ring without stitch welding seams; and each component and the connecting frame are welded to form a whole cabin using a friction stir welding process.

[0017] The whole cabin is provided with a rib, which is a continuous structure and comprises a main rib and an auxiliary rib; the main rib plays a main bearing role and can improve the load transmission efficiency; and the auxiliary rib is used to improve the local stability.

[0018] The main rib comprises a longitudinal main rib, a circumferential main rib and an inclined main rib, the longitudinal main rib and the circumferential main rib are continuous on the whole cabin, are distributed according to the load distribution, and the inclined main rib is arranged on the column section of the whole cabin and is distributed according to the load distribution; and the auxiliary rib is evenly distributed between the main ribs and is continuous on the whole cabin.

[0019] In combination with the first aspect, preferably, the connecting frame is a circular ring-shaped integral structure, the outer wall of the connecting frame has a longitudinal reinforcing rib, the cross section of the connecting frame is determined based on the internal pressure load, the two ends of the connecting frame are provided with welding openings, the inner side of the connecting frame is provided with a stiffness-enhancing flange, and the flange is provided with a lightening groove.

[0020] In a second aspect, the present application provides a large-span continuous reinforced integral wallboard type sealed cabin shell structure, comprising a frame and a wallboard, and the frame and the wallboard are welded by a friction stir welding process.

[0021] The wallboard comprises a rib and a skin, and the rib and the skin are integrally formed; the rib is a continuous structure, comprising a main rib and an auxiliary rib; the main rib plays a main load bearing role and can improve load transmission efficiency; the auxiliary rib is used to improve local stability.

[0022] The main rib comprises a longitudinal main rib, a circumferential main rib and an oblique main rib; the longitudinal main rib and the circumferential main rib are continuous in the whole cabin, and are distributed according to the load layout; the oblique main rib is arranged at a column segment of the whole cabin and is distributed according to the load layout; the auxiliary rib is uniformly distributed between the main ribs in the whole cabin and is continuous in the whole cabin.

[0023] In combination with the first aspect or the second aspect, preferably, a distribution angle of the longitudinal main rib in the circumferential direction of the whole cabin is adjusted according to the cabin body configuration size and the load layout; a distribution position of the circumferential main rib is adjusted according to the cabin body configuration size and the load layout; and a distribution position and an angle of the oblique main rib are adjusted according to the cabin body configuration size and the load layout.

[0024] In combination with the first aspect or the second aspect, preferably, the main rib is determined through the following optimization process:

[0025] First, a finite element model of the sealed cabin structure is established; topology optimization is performed on the main rib according to the load working condition of the lunar lander to determine the layout position and configuration of the main rib; the topology optimization is constrained by the requirements of strength and stiffness and targets at the minimum structure weight; then, a reconfiguration of the processable model is performed according to the topology optimization result; then, parameter optimization is performed on the main rib thickness in different regions and the overall rib height as optimization variables, which is constrained by the minimum instability coefficient of the structure being greater than or equal to 2 and targets at the minimum weight; finally, the strength and stiffness of the reconfigured model are checked.

[0026] In combination with the first aspect or the second aspect, preferably, the auxiliary rib is determined through the following optimization process: the auxiliary rib parameters are optimized with the constraint of the minimum instability coefficient of the local structure being greater than or equal to 2 and the target of the minimum weight.

[0027] In combination with the second aspect, preferably, the wallboard rib processing process is as follows: the rib processing is completed in the part state in the non-welding area, the welding area is not processed before welding, a certain thickness of uniform material is reserved in the welding area, and the rib of this area is milled after the welding is completed.

[0028] In combination with the first aspect or the second aspect, preferably, an out-cabin door capable of opening and closing inside and outside is arranged on the side of the sealed cabin shell structure, a reinforced beam is screwed at the door opening, an annular load expansion reinforcing rib is arranged at the local door opening, and the local skin is not specially thickened.

[0029] In combination with the first aspect or the second aspect, preferably, the docking surface of the sealed cabin shell structure is bonded and screwed with a connecting corner box of the two cabins, in order to efficiently expand the load, the bonding surface of the connecting corner box and the cabin body is designed as a semicircle, and a shear-resistant cone sleeve is nested in the connecting corner box to bear the shear load of the two cabins.

[0030] In combination with the first aspect or the second aspect, preferably, four landing legs are mounted below the sealed cabin shell structure, which are uniformly arranged in the circumferential direction, each landing leg comprises a main leg and two auxiliary legs; the main leg and the auxiliary legs are connected with the cabin body through connecting corner boxes, the connecting corner box corresponding to the main leg is glued and screwed with the rear connecting frame of the sealed cabin shell structure, and the high-strength rear connecting frame is used to bear the load, and at the same time, the connecting corner box corresponding to the main leg is connected with the sealed cabin shell structure in a surface connection mode, which is beneficial to bearing the shear load; the two auxiliary legs are connected with the connecting corner boxes of the two cabins.

[0031] In combination with the first aspect or the second aspect, preferably, a reverse tapered skirt structure is arranged on the inner side wall of the sealed cabin, and the skirt-shaped skin is pulled to the sealed cabin shell to realize the connection and bearing of the storage tank.

[0032] Compared with the prior art, the present application has the following beneficial effects:

[0033] (1) The load bearing efficiency is improved: compared with the traditional wallboard type sealed cabin, all the reinforcing ribs of the whole wallboard type sealed cabin, including longitudinal ribs, ring ribs and inclined ribs, are continuous structures, and the ribs are not disconnected in the girth weld and longitudinal weld area, the force transmission is directly continuous, and the load transmission efficiency is improved.

[0034] (2) The structure weight of the sealed cabin is reduced: unlike the normal orthogonal reinforcing ribs of the traditional wallboard type sealed cabin, the wallboard ribs of the whole wallboard type sealed cabin are in a multi-stage form, including main ribs and auxiliary ribs, the main ribs play a main bearing role and have high bearing efficiency, wherein the main ribs are composed of longitudinal main ribs, ring main ribs and large-span whole inclined main ribs, the longitudinal main ribs, ring main ribs and inclined ribs jointly act, the load transmission efficiency is high, the structure has good overall stability, the auxiliary ribs are composed of longitudinal auxiliary ribs, ring auxiliary ribs and inclined auxiliary ribs, and are used to improve the local stability. The multi-stage continuous ribbing configuration has good stability, good buckling resistance performance, can suppress local instability, has strong bearing capacity, and has high lightweight degree of structure.

[0035] (3) Flexible design: unlike the traditional wallboard type sealed cabin, the parameters of the normal orthogonal reinforcing ribs are all consistent, the main and auxiliary ribs of the whole wallboard type sealed cabin have different functions, the parameters can be optimized according to the size of the sealed cabin, the bearing size and the load distribution, the main ribs and the auxiliary ribs are designed as different parameters, in addition, the rib direction can be changed according to the load demand, which greatly reduces the structure weight, the design can be changed as needed, the design is flexible and has higher lightweight degree.

[0036] (4) New process is adopted to improve the structural performance: for the first time, the friction stir welding with high welding coefficient and excellent welding performance is adopted on the manned spacecraft to realize the welding of the medium-thickness cabin body structure, so that the continuous stiffening of the cabin body structure is realized; the spinning process is used to integrally form the front spherical cone raw material, and the whole forging ring is used as the raw material of the rear cone structure, without spliced welding seam, so that the structural efficiency is improved, the structural stiffness is enhanced, and the processing technology is simplified.

[0037] (5) The cabin door opening is efficiently reinforced: the stiffening beam is directly screwed at the egress cabin door opening, instead of being locally thickened, the wall plate does not need to be designed with a complex cross-section reinforcing frame in the local area, the raw material does not need to be thickened in large quantities, and the processing technology is simplified. The local skin does not need to be specially thickened, and the structural use efficiency and lightweight degree are high.

[0038] (6) The two-cabin connecting corner box is connected by being bonded and screwed on the cabin body butt joint surface, the semicircular corner box is glued to the side wall, the interface load is efficiently diffused, the shear cone sleeve is nested in the corner box, and the shear load of the two cabins is borne.

[0039] (7) The main leg corner box of the landing leg is glued and screwed with the rear connecting frame, the rear connecting frame with high strength is used for bearing, the two auxiliary legs are connected with the two-cabin connecting corner box, the two-cabin connecting corner box and the cabin body reinforcing area are reused, and the structural efficiency is improved.

[0040] (8) The side wall is designed with an inverted conical skirt structure, and the skin is inclined to the side wall, so that the connection and bearing of the storage tank are realized. This connection form reduces the bending moment of the storage tank load acting on the side wall, and efficiently solves the bearing problem.

[0041] (9) The product has been verified by ground tests, and has passed the identification level test. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a schematic diagram of the large-span continuous stiffening integral wall plate type sealed cabin shell structure of the present application;

[0043] Figure 2 is a schematic diagram of the sealed cabin shell structure (square egress cabin opening angle);

[0044] Figure 3 is a schematic diagram of the main rib of the sealed cabin shell structure; Figure 3 a is a two-dimensional development of the main rib, Figure 3 b is a three-dimensional schematic diagram of the main rib;

[0045] Figure 4 is a schematic diagram of the auxiliary rib of the sealed cabin shell structure; Figure 4 a is a two-dimensional development of the auxiliary rib, Figure 4 b is a three-dimensional schematic diagram of the auxiliary rib;

[0046] Figure 5 is a schematic view of the front cone section of the capsule shell structure;

[0047] Figure 6 is a sectional view of the front cone section of the capsule shell structure;

[0048] Figure 7 is a schematic view of the column section wall panel of the capsule shell structure;

[0049] Figure 8 is a sectional view of the column section wall panel of the capsule shell structure;

[0050] Figure 9 is a schematic view of the rear cone section of the capsule shell structure;

[0051] Figure 10 is a schematic view of the capsule shell structure hatch opening structure;

[0052] Figure 11 (a) is a schematic view of the components of the capsule hatch side stiffening I-beam structure;

[0053] Figure 11 (b) is a schematic view of the overall capsule hatch side stiffening I-beam structure;

[0054] Figure 12 is a schematic view of the two-capsule pyrotechnic lock connection structure;

[0055] Figure 13 is a schematic view of the two-capsule connection;

[0056] Figure 14 is a schematic view of the landing leg and capsule body connection;

[0057] Figure 15 is a schematic view of the landing leg main leg connection structure;

[0058] Figure 16 is a schematic view of the landing leg auxiliary leg connection structure;

[0059] Figure 17 is a schematic view of the storage box connection structure. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0061] A large-span continuous reinforced integral wall panel type capsule shell structure, in the direction from top to bottom, and in the structural shape, includes a front cone section 2, a first column section 4, a second column section 6, and a rear cone section 8, and a connecting frame is arranged between the front cone section 2 and the first column section 4, between the first column section 4 and the second column section 6, and between the second column section 6 and the rear cone section 8, and all components are integrally welded into the capsule shell structure.

[0062] A large-span continuous reinforced integral wallboard type sealed cabin shell structure can also be divided into frames and wallboards in the form of constituent parts, and the main materials of the frames and wallboards are 5B70 aluminum alloy. In order to meet the lightweight requirement, the wallboard includes a rib and an extremely thin skin, the thickness of the extremely thin skin is only 1.2 mm, and the total height of the sealed cabin shell wallboard rib is only 15 mm.

[0063] The rib of the wallboard of the sealed cabin shell structure is a continuous structure, and the rib is not disconnected in the girth weld and longitudinal weld area, the force is directly and continuously transmitted, and the load transmission efficiency is high.

[0064] In order to improve the load transmission efficiency, the rib of the wallboard is in a multi-stage form (divided into two stages), including a main rib and an auxiliary rib, the main rib includes a longitudinal main rib, a girth main rib and an inclined main rib, the longitudinal main rib and the girth main rib are continuous in the whole cabin, are distributed according to the load distribution condition, and the inclined main rib is arranged in the first column segment 4 and the second column segment 6, and the auxiliary rib is uniformly distributed between the main ribs and is continuous in the whole cabin.

[0065] The main rib includes the longitudinal main rib, the girth main rib and the inclined main rib, is continuous in the whole cabin, and the longitudinal main rib, the girth main rib and the inclined main rib jointly act, so that the load transmission efficiency is high and the overall stability of the structure is good. The continuous inclined main rib greatly improves the bearing efficiency relative to the traditional pure vertical rib, and the angle of the inclined main rib can be adjusted according to the cabin body configuration size and the main load of the cabin body.

[0066] The wallboard rib of the sealed cabin shell structure, the main rib optimization process is as follows: firstly, a finite element model of the sealed cabin structure is established, the main rib of the wallboard rib is topologically optimized according to the load condition of the lunar lander, the layout position and configuration of the rib are determined, the topological optimization is constrained by the strength and stiffness meeting the requirements, and the structure weight minimum is taken as the target; in the second step, the reconfiguration of the processable model is carried out according to the topological optimization result; in the third step, the rib thickness in different regions and the overall rib height are taken as optimization variables, and parameter optimization is carried out, the parameter optimization is constrained by the structure minimum instability coefficient ≥ 2, and the weight minimum is taken as the target; in the fourth step, the model after reconfiguration is checked for strength and stiffness. The auxiliary rib optimization process is as follows: the local structure minimum instability coefficient ≥ 2 is taken as the constraint, the weight minimum is taken as the target, and the auxiliary rib parameters are optimized.

[0067] The sealed cabin shell structure adopts a new process to improve the structural performance: for the first time, the friction stir welding with high welding coefficient and excellent welding performance is used on the manned spacecraft to realize the welding of medium-thickness cabin structure, so as to realize the continuous reinforcement of thin-walled cabin structure, specifically: the front spherical cone of the front cone segment 2 is integrally formed by using the spinning process, the rear cone segment 8 uses a whole forging ring, there is no stitch welding seam, the structural efficiency is improved, the structural stiffness is enhanced, and the processing technology is simplified, and the connecting frames and wallboards at the remaining positions are welded by using the friction stir welding process.

[0068] In order to ensure the continuity of the wall plate rib, the wall plate rib processing process is that the non-welding area completes the rib processing in the part state, the welding area is not processed before welding, the welding area is reserved as 20mm thick uniform thick material, and the rib of the area is milled after welding. The VPPA welding thickness used in the traditional manned capsule is 3-10mm, which cannot meet the requirements, so the friction stir welding with a larger welding thickness range is used for the first time in the manned capsule.

[0069] The front cone section 2 is an overall wall plate structure with a spherical top configuration, integrally formed without welding joint, and the raw material is formed by overall spinning process. The welding link between the wall plates is reduced, the manufacturing process is optimized, and the shell stiffness is increased. The first column section 4 and the second column section 6 are wall plate structures, respectively welded by four wall plate parts. The rear cone section 8 is integrally formed, and the raw material adopts overall ring binding process, which reduces two circumferential welds and multiple longitudinal welds, optimizes the manufacturing process, and increases the shell stiffness.

[0070] The large-span continuous ribbed overall wall plate type capsule shell structure is designed with an outboard hatch door which can be opened and closed inside and outside as a channel for astronauts to enter and exit the moon. The hatch door opening is directly screwed with a stiffener beam instead of using the traditional local thickening method, and the wall plate does not need to design a complex section stiffening frame locally, and the raw material does not need to be thickened a lot, and the processing process is simplified. The local skin does not need to be specially thickened, and the structure has high utilization efficiency and lightweight degree. The outboard hatch door is a square hatch door with a diameter of 1000mmx1000mm. The side wall of the capsule needs to be designed with an opening of 1000mmx1000mm, and the shell structure strength and stiffness at the opening are greatly weakened. In order to increase the local stiffness, an I-shaped section stiffener beam is screwed on both sides of the shell to strengthen the shell structure, as shown in Figure 11 (a)、 Figure 11 (b).

[0071] The connecting frame is a circular ring structure, the outer wall of the connecting frame has a longitudinal stiffener, the cross section of the connecting frame is determined based on the internal pressure load, the two ends of the connecting frame are provided with a welding opening, the inner side of the connecting frame is provided with a stiffness enhancing flange, and the flange is provided with a lightening groove. Specifically, the connecting frame between the front cone section 2 and the first column section 4 is the front connecting frame 3, the connecting frame between the first column section 4 and the second column section 6 is the middle frame 5, and the connecting frame between the second column section 6 and the rear cone section 8 is the rear connecting frame.

[0072] The large-span continuous ribbed overall wall plate type capsule shell structure is connected by two capsule pyrotechnic locks (as shown in Figure 12As shown in the figure), the two-cabin connecting corner box is bonded and screwed on the cabin docking surface (the two-cabin connecting corner box is bonded and screwed with the cabin), the connection of the two-cabin explosive lock is realized, and the rear end frame of the sealed cabin is a two-cabin docking frame; in order to efficiently diffuse the load, the bonding surface of the two-cabin connecting corner box and the side wall of the cabin is designed as a semicircle, a shear cone sleeve is nested in the corner box, and the shear cone sleeve plays a role of bearing the shear load of the two cabins, as shown in the figure. Figure 13 As shown in the figure). The main leg connecting corner box of the landing leg is bonded and screwed with the rear connecting frame, the rear connecting frame with high strength is used for bearing, the two-cabin connecting corner box is designed with a landing leg auxiliary leg connecting interface, the auxiliary leg is also connected with the two-cabin connecting corner box, and the two-cabin connecting corner box and the cabin reinforcing area realize structural reuse, thereby improving the structural efficiency.

[0073] The large-span continuous stiffening whole-wall sealed cabin shell structure is provided with landing legs below, as shown in the figure. Figure 14 As shown in the figure), there are four landing legs, which are uniformly arranged in the circumferential direction, each landing leg includes a main leg and two auxiliary legs. The main leg and the auxiliary leg are connected with the cabin through a corner box, the main leg corner box is bonded and screwed with the rear connecting frame, the rear connecting frame with high strength is used for bearing, at the same time, the main leg connecting corner box has a larger connecting surface with the cabin wall, and is connected with the connecting frame peripheral skin, which is beneficial to bearing the shear load; the two auxiliary legs are connected with the two-cabin connecting corner box, and this design scheme can reuse the two-cabin connecting corner box and the cabin reinforcing area, thereby improving the structural efficiency, as shown in the figure. Figure 15 and Figure 16 As shown in the figure.

[0074] The storage tank of the lander is limited by the design and process of the common bottom storage tank, and the connecting flange cannot be designed as a conventional integral annular ear, but a straight connecting flange. A reverse conical skirt structure is designed on the inner side wall of the sealed cabin, and the skin is inclined to the side wall. This kind of connection form reduces the bending moment of the storage tank load acting on the side wall, and efficiently solves the bearing problem, as shown in the figure. Figure 17 As shown in the figure.

[0075] More specifically:

[0076] Figure 1 is a large-span continuous stiffening whole-wall sealed cabin shell structure composition schematic diagram. The sealed cabin shell structure is composed of a front spherical cone, a column segment and a rear cone, the connecting frame includes a front end frame, a front connecting frame, an intermediate frame, a rear connecting frame and a rear end frame, the wall plate includes a front cone wall plate, a column segment wall plate 1, a column segment wall plate 2 and a rear cone wall plate, and the connecting frame and the wall plate are welded to form a sealed cabin integral shell.

[0077] The total height of the sealed cabin is 3450mm, the height of the front cone is 500mm, the diameter of the column segment is φ2800mm, and the main body material of the shell structure includes 5B70 aluminum alloy.

[0078] The connecting frame is an integral circular forged ring, the outer wall of the connecting frame has a longitudinal reinforcing rib, the cross section of the frame is determined according to the internal pressure load bearing, and the welding of the connecting frame and the wall plate is as followsFigure 3 as shown.

[0079] The wall plate rib is composed of a main rib and an auxiliary rib, as shown in Figure 4 and Figure 5 The main rib and the auxiliary rib are continuous structures at all longitudinal seam and girth seam positions and are not disconnected in the welding seam area. The height of the side wall main rib in this example is 10 mm, the width of the main rib is 3 mm, the thickness of the auxiliary rib with the skin is 5.7 mm, the width of the auxiliary rib is 2 mm, the thickness of the welding opening skin is 3 mm, the welding opening height is 50 mm, and the grid parameters are between about 130 mm x 130 mm and 160 mm x 150 mm.

[0080] The non-welding seam area completes the processing of the wall plate rib in the part state, the welding area is processed into a thick material with the same thickness as the cabin side wall before welding, and the rib in this area is processed after welding is completed. Milling, the welding form of all longitudinal seams and girth seams is friction stir welding. The main rib is composed of an upright rib composed of longitudinal main ribs and girth main ribs and a large-span integral inclined main rib. The inclined main rib in this example is arranged according to the load, the rear cone has a larger load, and the inclined main rib is arranged more densely. The inclination angle of all main ribs is between 30° and 45°.

[0081] The front cone wall plate is a spherical wall plate, as shown in Figure 6 and Figure 7 The front cone wall plate has no welding seam, the raw material is a whole spinning, and the skin thickness is 1.2 mm. The column segment wall plate is as shown in Figure 8 and Figure 9 The column segment wall plate 1 and the column segment wall plate 2 are welded into a ring-shaped wall plate assembly by 4 wall plate parts, and the wall plate skin thickness is 1.2 mm. The rear cone wall plate is as shown in Figure 10 The rear cone wall plate has no welding seam, and the raw material is a whole forging.

[0082] The cabin door opening is locally designed with a ring-shaped load expansion reinforcing rib. The cabin door opening has an I-shaped cross section, the thickness of the partition plate is 2 mm, the thickness of the bottom plate is 2 mm, the thickness of the vertical plate is 4.85 mm, and the thickness of the top plate is 6 mm, as shown in Figure 2 .

[0083] Eight pieces of pyrotechnic locks and eight pieces of spring separation push rods are installed on the two-cabin separation surface. The pyrotechnic locks are evenly distributed in the circumferential direction, and the distribution circle diameter is φ2776 mm. In order to realize the connection of the two-cabin pyrotechnic locks, a high-strength connection corner box is bonded on the cabin body, as shown in the figure. The corner box material is 7075 high-strength aluminum, and the bonding glue between the cabin body and the rear end frame is 420 glue. The two cabins are connected through the pyrotechnic locks. The side of the lunar cabin is embedded with a shear-resistant cone sleeve, and the side of the propulsion cabin is provided with a conical frustum. The cabins are connected through the shear-resistant cone.

[0084] The inside wall of the sealed cabin is designed as an inverted conical skirt structure, the skirt skin is pulled to the sealed cabin shell, the inverted conical skirt structure is a variable thickness section, the thickness gradually increases from 10 mm to 15 mm, the skirt edge is designed as a boss, M12 threaded holes are processed on the boss, and there are 92 threaded holes in total.

[0085] The content not described in detail in the specification of the present application is the known technology of those skilled in the art.

[0086] Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the technical solutions of the present application, belongs to the protection scope of the technical solutions of the present application.

Claims

1. A large span continuous reinforced monolithic wall panel type sealed cabin shell structure, characterized in that, The connecting frame is provided between the front cone section and the first column section, between the first column section and the second column section, and between the second column section and the rear cone section. The first column section and the second column section are both wall plate structures and are respectively formed by welding a plurality of wall plate parts; the front cone section is integrally formed by using a spinning process, and the rear cone section is formed by using a forged ring without a tailor-welded seam; and each component and the connecting frame are welded by using a friction stir welding process to form an integrated cabin. The cabin is provided with a rib, and the rib is a continuous structure including a main rib and an auxiliary rib; the main rib plays a main load bearing role and can improve load transmission efficiency. The auxiliary rib is used to improve local stability. The main rib includes a longitudinal main rib, a circumferential main rib and an inclined main rib; the longitudinal main rib and the circumferential main rib are continuous on the cabin and are distributed according to load distribution conditions; the inclined main rib is arranged on the column section of the cabin and is distributed according to load distribution; and the auxiliary rib is uniformly distributed between the main ribs and is continuous on the cabin.

2. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 1, characterized in that, The connecting frame is a circular ring structure, the outer wall of the connecting frame is provided with a longitudinal reinforcing rib, the cross section of the connecting frame is determined based on internal pressure load, the two ends of the connecting frame are provided with welding openings, the inner side of the connecting frame is provided with a stiffness enhancement flange, and the flange is provided with a lightening groove.

3. A large span continuous reinforced monolithic wall panel type sealed cabin shell structure, characterized in that, The frame and the wall plate are welded by using a friction stir welding process. The wall plate includes a rib and a skin, and the rib and the skin are integrally formed; the rib is a continuous structure including a main rib and an auxiliary rib; the main rib plays a main load bearing role and can improve load transmission efficiency. The auxiliary rib is used to improve local stability. The main rib includes a longitudinal main rib, a circumferential main rib and an inclined main rib; the longitudinal main rib and the circumferential main rib are continuous on the cabin and are distributed according to load distribution conditions; the inclined main rib is arranged on the column section of the cabin and is distributed according to load distribution; and the auxiliary rib is uniformly distributed between the main ribs and is continuous on the cabin.

4. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 1 or 3, characterized in that, The distribution angle of the longitudinal main rib in the circumferential direction of the cabin is adjusted according to the size of the cabin structure and load distribution, the distribution position of the circumferential main rib is adjusted according to the size of the cabin structure and load distribution, and the distribution position and angle of the inclined main rib are adjusted according to the size of the cabin structure and load distribution.

5. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 1 or 3, characterized in that, The main rib is determined by the following optimization process: First, a finite element model of the sealed cabin structure is established, the topology of the main rib is optimized according to the load conditions of the lunar lander, the layout position and configuration of the main rib are determined, the topology optimization is constrained by the requirements of strength and stiffness, and the minimum structure weight is taken as the target; then, the reconfiguration of the processable model is performed according to the topology optimization result; then, the main rib thickness in different regions and the overall rib height are taken as optimization variables, parameter optimization is performed, the parameter optimization is constrained by the minimum instability coefficient of the structure being greater than or equal to 2, and the minimum weight is taken as the target; finally, the model after reconfiguration is checked for strength and stiffness.

6. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 1 or 3, characterized in that, The auxiliary rib is determined by the following optimization process: the minimum instability coefficient of the local structure is greater than or equal to 2 as a constraint, the minimum weight is taken as a target, and the parameters of the auxiliary rib are optimized.

7. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 3, characterized in that, The rib processing process of the wall plate is as follows: the rib processing is completed in the part state in the non-welding area, the welding area is not processed before welding, a certain thickness of uniform material is reserved in the welding area, and the rib of this area is milled after the welding is completed.

8. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 1 or 3, characterized in that, The cabin door is capable of opening and closing inside and outside the cabin shell structure, a reinforcing beam is screwed at the cabin door opening, and the cabin door opening is partially provided with an annular load expansion reinforcing rib, and the local skin is not specially thickened.

9. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 1 or 3, characterized in that, The docking surface of the cabin shell structure is bonded and screwed with two-cabin connecting corner boxes, in order to efficiently expand the load, the bonding surface of the two-cabin connecting corner boxes and the cabin body is designed as a semicircle, a shear cone sleeve is nested in the connecting corner box, and the shear cone sleeve plays a role in bearing the shear load of the two cabins.

10. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 9, characterized in that, Four landing legs are installed below the cabin shell structure, which are uniformly arranged in the circumferential direction, each landing leg includes a main leg and two auxiliary legs; the main leg and the auxiliary leg are connected with the cabin body through the connecting corner box, the connecting corner box corresponding to the main leg is glued and screwed with the rear connecting frame of the cabin shell structure, and the high-strength rear connecting frame is used for bearing, and at the same time, the connecting corner box corresponding to the main leg is connected with the cabin shell structure in a surface connection mode, which is beneficial to bearing the shear load; the two auxiliary legs are connected with the two-cabin connecting corner boxes.

11. The large span continuous reinforced monolithic wall panel type sealed cabin shell structure according to claim 1 or 3, characterized in that, A reverse conical skirt structure is arranged on the inner side wall of the sealed cabin, the skirt-shaped skin is pulled to the cabin shell, and the connection and bearing of the storage tank are realized.

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