Airplane floor structure testing device

Abstract

The invention belongs to the technical field of structural strength testing, and particularly relates to an aircraft floor structure testing device. The device comprises a fixed base (1), an airtight and coordinated deformation loading frame (2), a hydraulic actuating cylinder (3) and a side supporting device (4), wherein the fixed base (1) is used for supporting and fixing the airtight and coordinated deformation loading frame (2) at the bottom, the airtight and coordinated deformation loading frame (2) comprises a rectangular frame, a floor test piece (203) is fixed on the front surface of the rectangular frame, an airtight box cover plate (209) is mounted on the back surface of the rectangular frame, the rectangular frame, the floor test piece (203) and the airtight box cover plate (209) form an airtight box, and an air bag (207) is mounted in the airtight box. The hydraulic actuating cylinder (3) is connected to one corner of the top of the rectangular frame, and the side face supporting device (4) is used for supporting and fixing the airtight box cover plate (209) on the rear portion. The test piece constraint and the test load can be efficiently and accurately applied, and the test efficiency is improved.

Description

Technical Field

[0001] This application belongs to the technical field of structural strength testing, and particularly relates to a test device for an aircraft floor structure. Background Art

[0002] In the airtight area of the main landing gear bay of an aircraft, there is a type of aircraft floor that is connected to the horizontal airtight floor on the upper side, the central wing on the lower side, and the fuselage skin on both sides. This floor structure needs to bear both the airtight load transmitted from the airtight area and the coordinated deformation load transmitted from the horizontal airtight floor and the central wing. Due to the special position of this floor structure, the size of the test piece has great limitations, and it is very difficult to directly apply the airtight load to it through air pressure; moreover, the load-bearing situation of this structure is complex, and it is jointly affected by the airtight load and the repeated coordinated deformation load, which increases the complexity of the design of the test loading device. Summary of the Invention

[0003] To solve the above problems, this application provides a test device for an aircraft floor structure, which truly simulates the support state and stress situation when it is in service in the aircraft structure based on the characteristics that the floor structure in the airtight area of the main landing gear bay of a civil aircraft is jointly affected by the airtight load and the coordinated deformation load.

[0004] The test device for the aircraft floor structure provided by this application mainly includes a fixed base, an airtight and coordinated deformation loading frame, a hydraulic actuator, and a side support device; among them, the fixed base is used to support and fix the airtight and coordinated deformation loading frame at the bottom, the airtight and coordinated deformation loading frame includes a rectangular frame, the floor test piece is fixed in front of the rectangular frame, and an airtight box cover plate is installed on the back. An airtight box is formed by the rectangular frame, the floor test piece, and the airtight box cover plate, and an airbag is installed inside it. The hydraulic actuator is connected to a corner at the top of the rectangular frame, and the side support device is used to support and fix the airtight box cover plate at the back.

[0005] Preferably, the fixed base includes a cross beam fixed to the ground and two double-ear bases arranged on the cross beam, and the double-ear bases are used to connect the rectangular frame of the airtight and coordinated deformation loading frame.

[0006] Preferably, the rectangular frame includes two vertical tension plates and two horizontal tension plates, which are connected at the four corners of the rectangular frame through four tension plate connection bolts. The two tension plate connection bolts at the bottom are connected to the double-ear bases of the fixed base, and one tension plate connection bolt at the top is connected to the loading double-ear. The loading double-ear is used to connect to the output shaft of the hydraulic actuator. The four sides of the floor test piece are respectively connected to the vertical tension plates and the horizontal tension plates through test piece connection bolts.

[0007] Preferably, both the vertical pull plate and the horizontal pull plate include an airtight box frame and a loading pull plate. The airtight box frame is used to enclose and form the side of the rectangular frame, and the loading pull plate is used to connect with the floor test piece. A plurality of double ears are arranged on the airtight box frame to connect with the airtight box cover through a connecting pull plate assembly.

[0008] Preferably, the vertical pull plate is cut at an angle where it is connected to the loading pull plate on the airtight box frame to form a space for avoiding the double ear base.

[0009] Preferably, one of the vertical pull plates is provided with an air inlet hole on the airtight box frame, and the other vertical pull plate is provided with an air outlet hole on the airtight box frame. The air inlet hole is used to install the air inlet pipe of the airbag, and the air outlet hole is used to install the air outlet pipe of the airbag.

[0010] Preferably, a plurality of horizontal stiffening rib assemblies and a plurality of vertical stiffening rib assemblies are fixed on the airtight box cover. Both the horizontal stiffening rib assemblies and the vertical stiffening rib assemblies have a first through hole for connecting with the connecting pull plate assembly, and a second through hole for connecting with the airtight box cover through a stiffening rib connecting bolt. At the same time, the horizontal stiffening rib assemblies also have a third through hole for connecting with the single ear joint of the side support device.

[0011] Preferably, the connecting pull plate assembly includes a connecting pull plate and through holes located on both sides of the connecting pull plate. A bolt is connected in each through hole through a spherical plain bearing. One of the bolts is connected to the double ear on the airtight box frame, and the other bolt is connected to the first through hole of the horizontal stiffening rib assembly or the vertical stiffening rib assembly.

[0012] Preferably, the side support device includes a column, a support rod is fixed on the column, and the single ear joint is arranged at the end of the support rod.

[0013] Preferably, a strip-shaped hole extending in the vertical direction is arranged on the column. After the support rod passes through the strip-shaped hole, it is fixed by a nut threadedly connected to the support rod.

[0014] This application realizes the support and loading of the aircraft floor structure test piece under the combined action of airtight load and coordinated deformation load, and can be used for applying the coordinated deformation load of the aircraft floor structure test piece under the airtight load condition. The test device is easy to install, has a compact structure, can apply the test piece constraint and test load efficiently and accurately, and improves the test efficiency. Description of the Drawings

[0015] Figure 1 is the device axonometric view of a preferred embodiment of the aircraft floor structure test device of this application.

[0016] Figure 2 is the schematic diagram of the fixed base structure.

[0017] Figure 3 It is a front schematic diagram of the airtight and coordinated deformation loading frame.

[0018] Figure 4 It is a back schematic diagram of the airtight and coordinated deformation loading frame.

[0019] Figure 5 It is a schematic diagram of the vertical tension plate structure.

[0020] Figure 6 It is a schematic diagram of the horizontal tension plate structure.

[0021] Figure 7 It is a schematic diagram of the tension plate connection bolt structure.

[0022] Figure 8 It is a schematic diagram of the airbag structure.

[0023] Figure 9 It is a schematic diagram of the connection tension plate assembly structure.

[0024] Figure 10 It is a schematic diagram of the airtight box cover plate structure.

[0025] Figure 11 It is a schematic diagram of the horizontal stiffening rib assembly structure.

[0026] Figure 12 It is a schematic diagram of the vertical stiffening rib assembly structure.

[0027] Figure 13 It is a schematic diagram of the side support device structure.

[0028] Among them, 1 - fixed base, 2 - airtight and coordinated deformation loading frame, 3 - hydraulic actuator, 4 - side support device, 101 - cross beam, 102 - connection bolt, 103 - double - ear base, 201 - vertical tension plate, 2011 - airtight box border, 2012 - loading tension plate, 2013 - space, 2014 - air inlet hole, 202 - horizontal tension plate, 203 - floor test piece, 204 - tension plate connection bolt, 205 - test piece connection bolt, 206 - loading double - ear, 207 - airbag, 208 - connection tension plate assembly, 2081 - connection tension plate, 2082 - spherical plain bearing, 2083 - bolt, 2084 - washer, 2085 - nut, 209 - airtight box cover plate, 210 - horizontal stiffening rib assembly, 210a - stiffening rib angle piece type A, 211 - stiffening rib connection bolt, 212 - vertical stiffening rib assembly, 212a - stiffening rib angle piece type B, 212b - bolt assembly, 212c - cushion block, 401 - column, 402 - nut, 403 - support rod, 404 - single - ear joint, 405 - bolt assembly. Specific implementation mode

[0029] To make the objectives, technical solutions, and advantages of the present application more clear, the following will describe in more detail the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application. The following will describe in detail the embodiments of the present application in conjunction with the accompanying drawings.

[0030] The present application provides an aircraft floor structure test device, as Figure 1 shown, mainly including a fixed base 1, an airtight and coordinated deformation loading frame 2, a hydraulic actuator 3, and a side support device 4; wherein, the fixed base 1 is used to support and fix the airtight and coordinated deformation loading frame 2 at the bottom, and the airtight and coordinated deformation loading frame 2 includes a rectangular frame, as Figure 3 and Figure 4 shown, a floor test piece 203 is fixed in front of the rectangular frame, and an airtight box cover plate 209 is installed on the back. An airtight box is formed by the rectangular frame, the floor test piece 203, and the airtight box cover plate 209, and an airbag 207 is installed therein. The hydraulic actuator 3 is connected to a corner at the top of the rectangular frame, and the side support device 4 is used to support and fix the airtight box cover plate 209 at the back.

[0031] The fixed base 1 of the present application provides fixed support for the bottom horizontal pull plate 202 of the airtight and coordinated deformation loading frame 2, and applies a horizontal load to the loading double ears 206 of the airtight and coordinated deformation loading frame 2 through the hydraulic actuator 3. The side support device 4 provides out-of-plane support for the airtight and coordinated deformation loading frame 2 to prevent unexpected out-of-plane deformation during the test. The airbag 207 contacts the surface of the floor test piece 203 that bears the airtight load, and the airtight load is applied by inflating the airbag 207.

[0032] In some alternative embodiments, as Figure 2 shown, the fixed base 1 includes a cross beam 101 fixed to the ground, and two double ear bases 103 provided on the cross beam 101, and the double ear bases 103 are used to connect the rectangular frame of the airtight and coordinated deformation loading frame 2.

[0033] In this embodiment, the fixed base 1 is fixed to the ground through the cross beam 101, and then two double-ear bases 103 are fixed to the cross beam 101 through the connecting bolts 102. Through bolt connection, the two double-ear bases 103 can be installed at any position on the cross beam 101 so as to be adaptively connected to the coordinated deformation loading frame 2.

[0034] In some alternative embodiments, as Figure 3 shown, the rectangular frame includes two vertical tension plates 201 and two horizontal tension plates 202, which are connected at the four corners of the rectangular frame through four tension plate connecting bolts 204. The two tension plate connecting bolts 204 at the bottom are connected to the double-ear bases 103 of the fixed base 1, and one tension plate connecting bolt 204 at the top is connected to the loading double-ear 206. The loading double-ear 206 is used to connect to the output shaft of the hydraulic actuator 3. The four sides of the floor test piece 203 are respectively connected to the vertical tension plates 201 and the horizontal tension plates 202 through the test piece connecting bolts 205.

[0035] As Figure 4 shown, the reverse side of the airtight and coordinated deformation loading frame 2 is composed of one airtight box cover plate 209 connected to the vertical tension plates 201 and the horizontal tension plates 202 through the connecting tension plate assembly 208 to form an airtight box, and an airbag 207 is placed inside the airtight box. As Figure 7 shown, the tension plate connecting bolt 204 is composed of a bolt, a washer and a nut.

[0036] In some alternative embodiments, as Figure 5 and Figure 6 shown, both the vertical tension plate 201 and the horizontal tension plate 202 include an airtight box border 2011 and a loading tension plate 2012. The airtight box border 2011 is used to enclose and form the side of the rectangular frame, and the loading tension plate 2012 is used to connect to the floor test piece 203. A plurality of double-ears are provided on the airtight box border 2011 to be connected to the airtight box cover plate 209 through the connecting tension plate assembly 208.

[0037] In this embodiment, the double-ears are welded to the airtight box border 2011 for connecting the airtight box cover plate 209 to form an airtight box.

[0038] In some alternative embodiments, as Figure 5 shown, the vertical tension plate 201 is cut at an angle where it is connected to the loading tension plate 2012 on the airtight box border 2011 to form a space 2013 for avoiding the double-ear base 103.

[0039] In some alternative embodiments, one of the vertical pull plates 201 is provided with an air inlet hole 2014 on the airtight box frame 2011, and the other vertical pull plate 201 is provided with an air outlet hole on the airtight box frame 2011. The air inlet hole 2014 is used to install the air inlet pipe 2071 of the airbag 207, and the air outlet hole is used to install the exhaust pipe 2072 of the airbag 207.

[0040] In this embodiment, the structural details of the airbag 207 are as Figure 8 shown. The air inlet pipe 2071 and the exhaust pipe 2072 are arranged diagonally, and the rubber airbag is in the middle. The air inlet pipe and the exhaust pipe of the airbag 207 pass through the air inlet hole / air outlet hole of the vertical pull plate 201 and are connected to the air source; the rubber airbag of the airbag 207 is used to store gas and apply an airtight load to the test piece 203.

[0041] In addition, the vertical pull plate 201 and the horizontal pull plate 202 of the present application also have lifting holes and reinforcing ribs. The lifting holes facilitate installation or disassembly during the test process, and the reinforcing ribs are used to increase the stiffness of the airtight box frame.

[0042] In some alternative embodiments, a plurality of horizontal reinforcing rib assemblies 210 and a plurality of vertical reinforcing rib assemblies 212 are fixed on the airtight box cover 209. Both the horizontal reinforcing rib assembly 210 and the vertical reinforcing rib assembly 212 have a first through hole for connecting to the connecting pull plate assembly 208, and a second through hole for connecting to the airtight box cover 209 through the reinforcing rib connecting bolt 211. At the same time, the horizontal reinforcing rib assembly 210 also has a third through hole for connecting to the single-ear joint 404 of the side support device 4.

[0043] In this embodiment, the airtight box cover 209 is as Figure 10 shown, and it has a plurality of connecting holes for installing the horizontal reinforcing rib assembly 210 and the vertical reinforcing rib assembly 212, as Figure 4 shown.

[0044] As Figure 11 shown, the horizontal reinforcing rib assembly 210 is composed of 2 reinforcing rib angle pieces A type 210a, and a plurality of connecting holes are arranged thereon. As Figure 12 shown, the vertical reinforcing rib assembly 212 is composed of 2 reinforcing rib angle pieces B type 212a, a bolt assembly 212b and a spacer 212c. Among them, a plurality of connecting holes are provided on the reinforcing rib angle piece B type 212a.

[0045] In some alternative embodiments, as Figure 9As shown, the connecting pull plate assembly 208 includes a connecting pull plate 2081 and through holes located on both sides of the connecting pull plate 2081. A bolt 2083 is connected in each through hole through a spherical plain bearing 2082. One of the bolts 2083 is connected to the double ears on the airtight box frame 2011, and the other bolt 2083 is connected to the first through hole of the horizontal stiffening rib assembly 210 or the vertical stiffening rib assembly 212.

[0046] In this embodiment, the spherical plain bearing 2082 in the connecting pull plate assembly 208 can provide a certain degree of rotational freedom for the connecting pull plate assembly 208, so that when the vertical pull plate 201 and the horizontal pull plate 202 are subjected to coordinated deformation loads, while connecting the airtight box cover 209, they can move relative to each other and will not generate large stress concentrations locally.

[0047] In some alternative embodiments, as Figure 13 shown, the side support device 4 includes a column 401, a support rod 403 is fixed on the column 401, and a single-ear joint 404 is arranged at the end of the support rod 403.

[0048] In some alternative embodiments, a strip-shaped hole extending in the vertical direction is provided on the column 401. After the support rod 403 passes through the strip-shaped hole, it is fixed by a nut 402 threadedly connected to the support rod 403.

[0049] In this embodiment, the column 401 is fixed to the ground, and the nut 402 and the support rod 403 are installed thereon; a threaded hole is provided at the end of the support rod 403 and is connected to the single-ear joint 404; the single-ear joint 404 is connected to the horizontal stiffening rib assembly 210 through a bolt assembly 405.

[0050] When installing the device provided in this application, first connect the test piece 203 to the vertical pull plate 201 and the horizontal pull plate 202 to form a rectangle, ensuring that the four corners are right angles. Then place the airbag 207 and fix the airbag 207 through the air inlet hole / exhaust hole on the vertical pull plate. Then install the airtight box cover 209, the horizontal stiffening rib assembly 210 and the vertical stiffening rib assembly 212, and then connect the airtight box cover 209 to the vertical pull plate 201 and the horizontal pull plate 202 through the pull plate connection assembly 208. Thus, the installation of the airtight and coordinated deformation loading frame 2 is completed. Then install the fixed base 1 and the side support device 3 according to the position of the ground rail, and then install the airtight and coordinated deformation loading frame 2 on the fixed base 1 and connect it to the side support device 3. After the above installation is completed, install the hydraulic actuator 3 according to the relative position of the loading double ears 206.

[0051] After the above installation, the test can be carried out. During the test, first, the airbag 207 is inflated by an air pump. After reaching the required air pressure, a displacement load is applied to the loading double ears 206 through the hydraulic actuator 3. The loading double ears 206 drive the horizontal pull plate 202 at the top to translate, and the left vertical pull plate 201 to rotate. At the same time, the right vertical pull plate 201 rotates along with the pull plate connecting bolt 204. Thus, the coordinated deformation load is applied to the floor test piece 203.

[0052] The test device provided by this application realizes the support and loading of the aircraft floor structure test piece under the combined action of airtight load and coordinated deformation load, and can be used to apply the coordinated deformation load to the aircraft floor structure test piece under the airtight load condition. This test device is easy to install, has a compact structure, can efficiently and accurately apply the test piece constraint and test load, and improves the test efficiency.

[0053] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. An aircraft floor structure test device, characterized in that: The invention comprises a fixed base (1), an airtight and coordinated deformation loading frame (2), a hydraulic actuator (3) and a side support device (4); wherein the fixed base (1) is used to support and fix the airtight and coordinated deformation loading frame (2) at the bottom, the airtight and coordinated deformation loading frame (2) comprises a rectangular frame, a floor test piece (203) is fixed on the front of the rectangular frame, and an airtight box cover (209) is installed on the back; an airtight box is formed by the rectangular frame, the floor test piece (203) and the airtight box cover (209), and an airbag (207) is installed in the airtight box; the hydraulic actuator (3) is connected to a corner of the top of the rectangular frame; and the side support device (4) is used to support and fix the airtight box cover (209) at the back.

2. The aircraft floor structure test device according to claim 1, characterized in that: The fixed base (1) comprises a crossbeam (101) fixed to the ground, and two double-ear bases (103) arranged on the crossbeam (101), wherein the double-ear bases (103) are used to connect the rectangular frame of the airtight and coordinated deformation loading frame (2).

3. The aircraft floor structure test device according to claim 2, characterized in that: The rectangular frame comprises two vertical pull plates (201) and two horizontal pull plates (202), which are connected at the four corners of the rectangular frame by four pull plate connecting bolts (204), the two pull plate connecting bolts (204) at the bottom are connected to the double-ear base (103) of the fixed base (1), and the top pull plate connecting bolt (204) is connected to the loading double ears (206), and the loading double ears (206) are used to connect to the output shaft of the hydraulic actuator (3), and the four sides of the floor test piece (203) are respectively connected to the vertical pull plates (201) and the horizontal pull plates (202) by the test piece connecting bolts (205).

4. The aircraft floor structure test device according to claim 3, characterized in that: The vertical pull plate (201) and the horizontal pull plate (202) both include an airtight box frame (2011) and a loading pull plate (2012); the airtight box frame (2011) is used to enclose the side of the rectangular frame; the loading pull plate (2012) is used to connect with the floor test piece (203); a plurality of double ears are provided on the airtight box frame (2011) to connect with the airtight box cover (209) through a connecting pull plate assembly (208).

5. The aircraft floor structure test device according to claim 4, characterized in that: The vertical pull plate (201) is cut at an angle on the airtight box frame (2011) where it is connected to the loading pull plate (2012), so as to form a space (2013) for avoiding the double-ear base (103).

6. The aircraft floor structure test device according to claim 4, characterized in that: One of the vertical pull plates (201) is provided with an air inlet hole (2014) on the airtight box frame (2011), and the other vertical pull plate (201) is provided with an exhaust hole on the airtight box frame (2011), wherein the air inlet hole (2014) is used to install an air inlet pipe (2071) of the airbag (207), and the exhaust hole is used to install an exhaust pipe (2072) of the airbag (207).

7. The aircraft floor structure test device according to claim 4, characterized in that: A plurality of horizontal reinforcing rib assemblies (210) and a plurality of vertical reinforcing rib assemblies (212) are fixed on the airtight box cover (209); the horizontal reinforcing rib assemblies (210) and the vertical reinforcing rib assemblies (212) both have a first through hole connected to the connecting pull plate assembly (208), and a second through hole connected to the airtight box cover (209) via a reinforcing rib connecting bolt (211); and the horizontal reinforcing rib assembly (210) also has a third through hole connected to the single ear joint (404) of the side support device (4).

8. The aircraft floor structure test device according to claim 7, characterized in that: The connecting plate assembly (208) comprises a connecting plate (2081) and through holes located on both sides of the connecting plate (2081), each through hole being connected with a bolt (2083) via a joint bearing (2082), one of the bolts (2083) being connected to two ears on the airtight box frame (2011), and the other bolt (2083) being connected to a first through hole of a horizontal reinforcing rib assembly (210) or a vertical reinforcing rib assembly (212).

9. The aircraft floor structure test device according to claim 7, characterized in that: The side support device (4) comprises a column (401), a support rod (403) is fixed on the column (401), and a single-ear joint (404) is arranged at the end of the support rod (403).

10. The aircraft floor structure test device according to claim 9, characterized in that: The upright column (401) is provided with a strip hole extending in the vertical direction. After the support rod (403) passes through the strip hole, it is fixed by a nut (402) threadedly connected to the support rod (403).

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