A crashworthy test residual energy absorption device

Abstract

The present application belongs to the technical field of helicopter test, and discloses a residual energy absorption device for crashworthiness test, which comprises an inner movable support, an energy absorption panel, a fixed mounting plate, a shear beam and an outer support; the outer support is a columnar structure with an open top and a hollow interior; the lower half of the inner movable support can slide up and down in the hollow of the outer support; the side of the inner movable support is hollowed out and the energy absorption panel is installed thereon; the shear beam is fixed by the fixed mounting plate and passes through the inner movable support and the outer support; the energy absorption panel is provided with a cooperating shear hole corresponding to the position of the shear beam; in the initial state, the inner movable support is located at a higher position and the shear beam passes through the shear hole of the energy absorption panel; after impact, the residual energy presses down from the top of the inner movable support, drives the energy absorption panel to move downward and deforms and damages under the action of the shear beam, thereby completing the absorption of the residual energy; the device can absorb the residual energy of the crashworthiness test and protect the test piece and test bench.

Description

Technical Field

[0001] This invention belongs to the field of helicopter testing technology, and relates to a device for testing the landing gear of a helicopter against crash, specifically a device for absorbing residual energy during crash testing. Background Technology

[0002] Crash testing of helicopter landing gear is a crucial step in studying the energy absorption and structural optimization design of helicopter landing gear during crashes. Almost all armed helicopter models require this testing during development. The key technology in this test is the design for absorbing residual energy from crash tests, the purpose of which is:

[0003] 1) Ensure that the test specimen has completed the predetermined energy absorption and prevent further damage, thereby providing accurate physical data for the subsequent optimization analysis of the test specimen;

[0004] 2) Prevent residual energy from damaging the test stand. Generally, when designing helicopters for crashworthiness, crash tests are required on the landing gear system to assess whether its crashworthiness meets the requirements of national military standards. Depending on the survival rate, there are specific regulations on the speed at which the test piece touches the stand, and the drop height of the test piece can be obtained through conversion.

[0005] Under normal circumstances, after the test specimen absorbs its own energy upon deployment, some residual energy is absorbed by components such as the fuselage and seat. However, in this test, only the landing gear is involved. The remaining energy then further impacts the landing gear, test fixtures, and test platform, causing unpredictable damage. Because the design of the test fixtures is crucial to the success of the test, they are typically robust and difficult to absorb residual energy. Conventional testing methods only consider the safety of the test specimen by providing limiting support for the test fixtures, but this is ineffective in absorbing residual energy and causes significant impact, even damage, to the test platform. The cost of restoring the test platform after the test is incalculable.

[0006] To address the issue of residual energy absorption, an energy-absorbing mechanism is needed to effectively protect the test specimen and test bench. Currently, the support and limiting methods used in laboratories for tooling fixtures are insufficient to meet the demands of current testing tasks. To adapt to the needs of scientific research in this new era and improve testing capabilities, there is an urgent need to develop a residual energy absorption device for crash testing. To date, my country lacks similar residual energy absorption devices for helicopter landing gear crash testing, and no relevant publicly available foreign literature has been found. Summary of the Invention

[0007] The purpose of this invention is to solve the above problems. This invention provides a residual energy absorption device for crash testing, specifically for absorbing residual energy in helicopter landing gear crash testing. Its functions include: 1) absorbing residual energy in landing gear crash testing to protect the test piece and test bench.

[0008] 2) The device can be reused by replacing the energy-absorbing components.

[0009] The technical solution of the present invention:

[0010] A residual energy absorption device for crash testing includes an internal movable support, an energy-absorbing panel, a fixed mounting plate, a shear beam, and an external support. The external support is a columnar structure with an open top and a hollow interior. The lower half of the internal movable support can slide up and down within the cavity of the external support. The side portion of the internal movable support is hollowed out and fitted with the energy-absorbing panel. Symmetrical fixed mounting plates are installed on the sides of the external support. The shear beam is fixed by the fixed mounting plate and passes through the internal movable support and the external support. The energy-absorbing panel has matching shear holes corresponding to the positions of the shear beam. In the initial state, the internal movable support is located at a higher position, and the shear beam passes through the shear holes in the energy-absorbing panel. After impact, residual energy is pressed down from the top of the internal movable support, causing the energy-absorbing panel to move downwards and deform and break under the action of the shear beam, thus completing the absorption of residual energy.

[0011] Furthermore, the external support is a square columnar structure, the cavity of the external support is a square columnar cavity, and the internal movable support is a square columnar structure.

[0012] Furthermore, the top of the internal movable support is a square rigid cover plate, and the four straight columns below the four corners of the rigid cover plate are rigid structures. The bottom of the internal movable support is also a rigid structure. The four sides of the internal movable support are hollowed out, and the four energy-absorbing panels are respectively connected to the two sides of the four straight columns of the internal movable support to form the four sides of the internal movable support.

[0013] Furthermore, there are four fixed mounting plates, which are symmetrically arranged in pairs on the four sides of the upper part of the external support. The positions of the shear beams are staggered between the two symmetrical fixed mounting plates and the other pair of symmetrical fixed mounting plates.

[0014] Furthermore, the shear beam is a triangular prism structure, with the base of the triangle aligned with the horizontal plane and the apex of the triangle pointing upwards.

[0015] Furthermore, an observation and operation window is provided above or below the external support corresponding to the fixed mounting plate.

[0016] Furthermore, it also includes a limiting guide rod and a spring. The bottom of the limiting guide rod is fixed to the bottom surface of the inner side of the outer support. The bottom of the inner movable support has a through hole. The upper end of the limiting guide rod passes through the through hole at the bottom of the inner movable support. The spring is nested on the limiting guide rod, and the upper and lower ends are in contact with the inner movable support and the outer support.

[0017] Furthermore, it also includes a limiting bolt, and the limiting guide rod has external threads. The limiting bolt is installed on the limiting guide rod and can be adjusted up and down by the external threads of the limiting guide rod.

[0018] Furthermore, an observation and operation window is provided on the lower middle side of the external support.

[0019] Furthermore, after absorbing the remaining energy, the damaged energy-absorbing panel is removed, a new energy-absorbing panel is installed, and the device is restored to its initial state.

[0020] The beneficial effects of this invention are:

[0021] 1. The device of the present invention can absorb the residual energy of the crash test and protect the test specimen and test bench.

[0022] 2. The device of the present invention overcomes the shortcomings of the current laboratory method of using fixed support to protect the test specimen without considering the absorption of residual energy.

[0023] 3. The device of the present invention can overcome the above-mentioned shortcomings, and achieve the purpose of protecting the test specimen and test bench by absorbing the remaining energy, which greatly saves the test cost and improves the test efficiency.

[0024] 4. This invention can be reused by replacing the energy-absorbing panel.

[0025] 5. When using this device, the test personnel first need to calculate and analyze the remaining energy to be absorbed, then select a suitable energy-absorbing panel for installation, including considering the material and thickness, as well as selecting a suitable shear beam cross-sectional shape. Simultaneously, the internal movable support stroke displacement is calculated, and the position of the limit bolts is adjusted to limit the sinking position of the test piece, preventing further damage. This achieves the effect of absorbing the remaining energy from the crash test and protecting the test piece and test platform. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this invention, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 An isometric view of the residual energy absorption device from the crash test;

[0028] Figure 2 Isometric sectional view of the residual energy absorption device during crash testing;

[0029] Among them, 1—internal movable support, 2—energy-absorbing panel, 3—fixed mounting plate, 4—shear beam, 5—external support, 6—limiting guide rod, 7—limiting bolt, and 8—spring. Detailed Implementation

[0030] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are given in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] A residual energy absorption device for crash testing includes an internal movable support 1, an energy-absorbing panel 2, a fixed mounting plate 3, a shear beam 4, and an external support 5. The external support 5 is a columnar structure with an open top and a hollow interior. The lower half of the internal movable support 1 can slide up and down in the cavity of the external support 5. The side portion of the internal movable support 1 is hollowed out and the energy-absorbing panel 2 is installed thereon. The side of the external support 5 is equipped with symmetrical fixed mounting plates 3. The shear beam 4 is fixed by the fixed mounting plate 3 and passes through the internal movable support 1 and the external support 5. The energy-absorbing panel 2 has matching shear holes corresponding to the position of the shear beam 4. In the initial state, the internal movable support 1 is located at a higher position, and the shear beam 4 passes through the shear holes provided in the energy-absorbing panel 2. After impact, the residual energy is pressed down from the top of the internal movable support 1, causing the energy-absorbing panel 2 to move downward and deform and break under the action of the shear beam 4, thus completing the absorption of the residual energy.

[0034] The external support 5 is a square column structure, and the cavity of the external support 5 is a square column cavity. The internal movable support 1 is a square column structure.

[0035] The top of the internal movable support 1 is a square rigid cover plate. The four straight columns below the four corners of the rigid cover plate are rigid structures. The bottom of the internal movable support 1 is also a rigid structure. The four sides of the internal movable support 1 are hollowed out. The four energy-absorbing panels 2 are respectively connected to the two sides of the four straight columns of the internal movable support 1 to form the four sides of the internal movable support 1.

[0036] There are four fixed mounting plates 3, which are symmetrically arranged in pairs on the four sides of the upper part of the external support 5. The positions of the shear beam 4 are staggered between the two symmetrical fixed mounting plates 3 and the other pair of symmetrical fixed mounting plates 3.

[0037] Shear beam 4 is a triangular prism structure. The base of the triangle of shear beam 4 is flush with the horizontal plane, and the apex of the triangle of shear beam 4 is facing upward.

[0038] An observation and operation window is provided above or below the fixed mounting plate 3 corresponding to the external support 5.

[0039] It also includes a limiting guide rod 6 and a spring 8. The bottom of the limiting guide rod 6 is fixed to the bottom of the inner surface of the outer support 5. The bottom of the inner movable support 1 has a through hole. The upper end of the limiting guide rod 6 passes through the through hole at the bottom of the inner movable support 1. The spring 8 is nested on the limiting guide rod 6, and its upper and lower ends are in contact with the inner movable support 1 and the outer support 5.

[0040] It also includes a limiting bolt 7, and a limiting guide rod 6 with external threads. The limiting bolt 7 is installed on the limiting guide rod 6 and can be adjusted up and down by the external threads of the limiting guide rod 6.

[0041] An observation and operation window is provided on the lower middle side of the external support 5.

[0042] After absorbing the remaining energy, remove the damaged energy-absorbing panel 2, install a new energy-absorbing panel 2, and then restore the device to its initial state.

[0043] Another embodiment of the present invention will now be described with reference to the accompanying drawings.

[0044] The following reference Figure 1 , Figure 2 This patent is described in further detail. A residual energy absorption device for crash testing consists of an internal movable support 1, an energy-absorbing panel 2, a fixed mounting plate 3, a shear beam 4, an external support 5, a limiting guide rod 6, a limiting bolt 7, and a spring 8.

[0045] The energy-absorbing panel 2 has holes cut according to the cross-sectional shape of the shear beam 4 and is fixedly connected to the mounting surface of the internal movable support 1 by screws. The internal movable support 1 is nested inside the external support 5 and can move freely up and down. The fixed mounting plate 3 has holes cut according to the cross-sectional shape of the shear beam 4 and is fixedly installed on the external support 5 by screws. The shear beam 4 is assembled by passing through the internal movable support 1, the energy-absorbing panel 2, the external support 5, and the fixed mounting plate 3 to form a whole. The limiting guide rod 6 is threaded, with its bottom fixed to the bottom surface of the external support 5 and its top passing through the bottom of the internal movable support 1. The limiting bolt 7 is installed on the limiting guide rod 6 and can be adjusted up and down freely. The spring 8 is nested on the limiting guide rod 6, with its upper and lower ends in contact with the contact surfaces of the internal movable support 1 and the external support 5. All of the above components together form a complete landing gear crashworthiness test residual energy absorption device mechanism.

[0046] One specific implementation method:

[0047] 1. Select four energy-absorbing panels 2 and make holes at appropriate positions according to the cross-sectional shape of the shear beam 4. Then, install them on the mounting surface of the internal movable support 1 by screwing them together.

[0048] 2. Install the fixed mounting plate 3 on the outer surface of the external support 5, adjust the centering of the two fixed mounting plates 3 and their relative positions to ensure that the shear beam 4 can be installed accurately.

[0049] 3. Install the limiting bolt 7 on the limiting guide rod 6, then fix the limiting guide rod 6 on the inner bottom surface of the external support 5, and then nest the spring 8 on the limiting guide rod 6 in a centered manner;

[0050] 4. Place the external support 5 below, and nest the internal movable support 1 from above inside the external support 5. After aligning the hole positions, assemble the shear beam 4 across the internal movable support 1, the energy-absorbing panel 2, the external support 5, and the fixed mounting plate 3 into a whole.

[0051] 5. When using this device, the test personnel first need to calculate and analyze the remaining energy to be absorbed, then select a suitable energy-absorbing panel 2 for installation, and select a suitable shear beam 4 cross-sectional shape. At the same time, calculate the stroke displacement of the internal movable support 1, adjust the position of the limit bolt 7, limit the sinking position of the test piece, and prevent the test piece from being further damaged.

[0052] This achieves the effect of absorbing the residual energy of the crash test and protecting the test specimen and test bench.

[0053] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A crashworthy test residual energy absorption device, characterised in that, The device comprises an inner movable support (1), an energy absorption panel (2), a fixed mounting plate (3), a shear beam (4) and an outer support (5). The outer support (5) is a columnar structure with an open top and a hollow interior. The lower half of the inner movable support (1) can slide up and down in the hollow of the outer support (5). The side of the inner movable support (1) is hollowed out and the energy absorption panel (2) is installed. The outer support (5) is provided with symmetrical fixed mounting plates (3) on the sides. The shear beam (4) is fixed by the fixed mounting plates (3) and passes through the inner movable support (1) and the outer support (5). The energy absorption panel (2) is provided with a corresponding shear hole corresponding to the position of the shear beam (4). In the initial state, the inner movable support (1) is located at a higher position and the shear beam (4) passes through the shear hole of the energy absorption panel (2). After impact, the remaining energy is pressed from the top of the inner movable support (1), which drives the energy absorption panel (2) to move downward and deform under the action of the shear beam (4), thereby completing the absorption of the remaining energy. The device further comprises a limiting guide rod (6) and a spring (8). The bottom of the limiting guide rod (6) is fixed to the inner bottom surface of the outer support (5). The bottom of the inner movable support (1) is provided with a through hole. The upper end of the limiting guide rod (6) passes through the through hole at the bottom of the inner movable support (1). The spring (8) is nested on the limiting guide rod (6) and contacts the inner movable support (1) and the outer support (5) at the upper and lower ends.

2. An anti-crush test residual energy absorption device according to claim 1, wherein, The outer support (5) is a square columnar structure. The hollow of the outer support (5) is a square columnar cavity. The inner movable support (1) is a square columnar structure.

3. An anti-crush test residual energy absorption device according to claim 2, wherein, The top of the inner movable support (1) is a square rigid cover plate. The four straight columns below the four corners of the rigid cover plate are rigid structures. The bottom of the inner movable support (1) is also a rigid structure. The four sides of the inner movable support (1) are hollowed out. The four energy absorption panels (2) are connected to the two sides of the four straight columns of the inner movable support (1) as the four sides of the inner movable support (1).

4. An anti-crush test residual energy absorption device according to claim 3, wherein, There are four fixed mounting plates (3), which are symmetrically arranged on the upper four sides of the outer support (5). Among them, the positions of the two symmetrical fixed mounting plates (3) and the other two symmetrical fixed mounting plates (3) are staggered upward and downward to install the shear beam (4).

5. An anti-crush test residual energy absorption device according to claim 1, wherein, The outer support (5) is provided with an observation window above or below the fixed mounting plate (3).

6. An anti-crush test residual energy absorption device according to claim 1, wherein, The device further comprises a limiting bolt (7). The limiting guide rod (6) has external threads. The limiting bolt (7) is installed on the limiting guide rod (6) and is adjusted up and down through the external threads of the limiting guide rod (6).

7. An anti-crush test residual energy absorbing device according to claim 1 wherein, The outer support (5) is provided with an observation window on the side of the middle and lower part.

8. An anti-crush test residual energy absorption device according to claim 1, wherein, After the absorption of the remaining energy is completed, the damaged energy absorption panel (2) is disassembled, a new energy absorption panel (2) is installed, and the device is restored to the initial state.

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