Undercarriage drop test bed

Abstract

The utility model discloses an undercarriage drop test stand, which comprises a vertical track support, a vertical pulley assembly is arranged on the vertical track support, the vertical pulley assembly moves up and down along the vertical track support, and a cantilever pulley track assembly is fixedly connected to the vertical pulley assembly. The cantilever pulley track assembly moves up and down along the vertical track support along with the vertical pulley assembly, a horizontal pulley assembly is connected to the cantilever pulley track assembly in a sliding mode, an undercarriage mounting base is arranged on the lower side of the horizontal pulley assembly, and the undercarriage mounting base directly faces an inclined plane base plate arranged on the ground. According to the invention, impact generated by vertical falling of the undercarriage can be simulated, horizontal displacement generated by falling contact with a slope can also be simulated, various simulation test environments are provided, and the damage degree of the undercarriage and the stability of a connection area of the undercarriage and an aircraft main body are judged according to recorded test data.

Description

Technical Field

[0001] The utility model relates to the technical field of general aircraft, in particular to a landing gear drop shock test bench. Background Art

[0002] The landing gear of an aircraft is subjected to great impact during landing, so the design of its shock absorption system must be verified through vibration tests that simulate actual landing conditions. This test is crucial to evaluating the performance of the landing gear under extreme conditions. The test ensures the stability and safety of the landing gear when subjected to heavy pressure and impact, thereby ensuring the safety of the aircraft and its passengers.

[0003] However, such tests often rely on specialized equipment in the laboratory. During the test, a variety of sensors are used to collect key data. Force sensors are used to capture the impact force during landing, accelerometers monitor acceleration fluctuations during vibration, displacement sensors measure the displacement of the landing gear, and high-speed cameras record the deformation of the landing gear. For a comprehensive assessment, impact force sensors are also used to measure the forces in multiple directions.

[0004] Nevertheless, these tests are expensive and they focus more on data collection rather than directly determining the degree of damage to the landing gear or the stability of the area where it is connected to the aircraft body. In addition, existing test equipment is often large in size, occupies a large space, has a complex structure, and is not easy to carry, which limits the convenience of the test and its applicability in different environments. In response to the above problems, this application proposes a solution. Summary of the invention

[0005] Purpose of the utility model: The purpose of the utility model is to provide a landing gear drop shock test bench, which can solve the problems of existing test equipment being large in size, occupying a large space, having a complex structure, and being difficult to carry, and at the same time can determine the degree of damage to the landing gear and the stability of the connection area between it and the aircraft body.

[0006] Technical solution: The utility model describes a landing gear drop shock test bench, comprising a vertical track bracket, the vertical track bracket comprising a channel steel base fixed on the ground in a cross shape and a channel steel bracket vertically arranged on the channel steel base, the channel steel bracket comprising two back-to-back opposing channel steels, vertical pulley assemblies are arranged in the notches of the back-to-back opposing channel steels, the vertical pulley assembly moves up and down along the notches of the back-to-back opposing channel steels, gaps are arranged between the back-to-back opposing channel steels, a cantilever pulley track assembly is fixedly connected to the vertical pulley assembly, the cantilever pulley track assembly moves up and down along the notches of the back-to-back opposing channel steels following the vertical pulley assembly, a horizontal pulley assembly is slidably connected to the cantilever pulley track assembly, a landing gear mounting base is arranged on the lower side of the horizontal pulley assembly, and the landing gear mounting base is directly opposite to the inclined pad arranged on the ground.

[0007] Preferably, the vertical pulley assembly includes four groups of pulley structures, and the pulley structures are symmetrically arranged in pairs in the slots of the back-to-back opposing channel steels. Any of the pulley structures includes a pulley bracket and fixed pulleys arranged on both sides of the pulley bracket. The pulley bracket is arranged in the slot of the channel steel, and its width is smaller than the width of the slot. The fixed pulleys are arranged on both sides of the pulley bracket, and the fixed pulleys are connected to the inner wall of the slot of the channel steel, and rotate and displace along the inner wall of the slot, thereby driving the pulley bracket to displace along the slot.

[0008] Preferably, the cantilever pulley track assembly includes trapezoidal components opposite to each other on both sides of the channel steel bracket and sliding rails arranged in the gaps between the channel steel brackets. After the trapezoidal components are positioned and connected by connecting pieces, they are respectively fixedly connected to the vertical pulley assemblies in the notches on both sides of the channel steel bracket. The sliding rails are fixedly connected to the connecting pieces by oblique reinforcement ribs, and sliding tracks are arranged on the end surfaces of the slide rails on both sides facing the channel steel bracket.

[0009] Preferably, the horizontal pulley assembly includes a fixed plate, a connecting plate and a plurality of fixed pulleys, the fixed plates are opposite to each other on both sides of the slide rail, the connecting plate connects the fixed plates on both sides of the slide rail, the shaft of the fixed pulley is fixedly connected to the fixed plate, and the wheel portion is arranged in the slide rail.

[0010] Preferably, at least two rows of fixed pulleys are arranged in the sliding track of the slide rail, and fixed pulleys are slidably connected to both side walls of the sliding track.

[0011] Preferably, the landing gear mounting base is fixedly connected below the horizontal pulley assembly, and a tire is provided at the bottom of the landing gear mounting base.

[0012] Preferably, the inclined pad is fixed on the ground, and the plane inclination angle of the inclined pad is adjustable.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0014] (1) The utility model can not only simulate the impact caused by the vertical fall of the landing gear, but also simulate the horizontal displacement caused by the landing gear contacting the slope, providing a variety of simulation test environments;

[0015] (2) The installation position and interface of this utility model completely simulate the actual structure of the aircraft product, and the test results are highly accurate;

[0016] (3) The utility model has a simple structure and the main parts can be disassembled, which is convenient for transportation and storage;

[0017] (4) The utility model has low cost and can use standard structural steel and standard bolt fasteners except for a few machined parts;

[0018] (5) The utility model has a firm structure and can be tested repeatedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model from one angle.

[0020] Figure 2 This is an enlarged structural view of the vertical pulley assembly in the utility model.

[0021] Figure 3 It is an enlarged structural view of the horizontal pulley assembly in the utility model.

[0022] Figure 4 This is an enlarged structural view of the landing gear mounting base in the utility model.

[0023] Among them: 100, vertical track bracket; 200, vertical pulley assembly; 300, cantilever pulley track assembly; 400, horizontal pulley assembly; 500, landing gear mounting base; 600, tire; 700, inclined pad; 101, channel steel base; 102, channel steel bracket; 201, pulley structure; 202, pulley bracket; 203, fixed pulley one; 301, trapezoidal member; 302, slide rail; 303, connector; 304, oblique reinforcement rib; 305, sliding track; 401, fixed plate; 402, connecting plate; 403, fixed pulley two. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0025] See attached Figures 1 to 4 FIG. 1 shows a landing gear drop shock test bench of the utility model, comprising a vertical track bracket 100, wherein the vertical track bracket 100 comprises a channel steel base 101 fixed on the ground in a cross shape and a channel steel bracket 102 vertically arranged on the channel steel base, wherein the channel steel bracket 102 comprises two back-to-back opposite channel steels, and a vertical pulley assembly 200 is arranged in the notch of the back-to-back opposite channel steels, and the vertical pulley assembly 200 moves up and down along the notch of the back-to-back opposite channel steels, and a gap is arranged between the back-to-back opposite channel steels.

[0026] In this embodiment, the vertical pulley assembly 200 includes four groups of pulley structures 201, and the pulley structures 201 are symmetrically arranged in pairs in the slots of the back-to-back opposing channel steels. Any pulley structure 201 includes a pulley bracket 202 and a fixed pulley 203 arranged on both sides of the pulley bracket 202. The pulley bracket 202 is arranged in the slot of the channel steel, and its width is smaller than the width of the slot. The fixed pulley 203 is arranged on both sides of the pulley bracket 202. The fixed pulley 203 is connected to the inner wall of the slot of the channel steel, rotates and displaces along the inner wall of the slot, and drives the pulley bracket 202 to displace along the slot.

[0027] In this embodiment, a cantilever pulley track assembly 300 is fixedly connected to the vertical pulley assembly 200. The cantilever pulley track assembly 300 moves up and down along the grooves of the back-to-back opposing channel steels following the vertical pulley assembly 200. The cantilever pulley track assembly 300 includes a trapezoidal component 301 opposite to the two sides of the channel steel bracket 102 and a slide rail 302 arranged in the gap between the channel steel brackets 102. After the trapezoidal components 301 are positioned and connected by connecting pieces 303, they are respectively fixedly connected to the pulley structures 201 in the grooves on both sides of the channel steel bracket 102. The slide rail 302 is fixedly connected to the connecting piece 303 by an oblique reinforcing rib 304. Sliding rails 305 are arranged on the end surfaces of the slide rail 302 on both sides facing the channel steel bracket 102.

[0028] In this embodiment, a horizontal pulley assembly 400 is slidably connected to the cantilever pulley track assembly 300. The horizontal pulley assembly 400 includes a fixed plate 401, a connecting plate 402 and a plurality of fixed pulleys 403. The fixed plates 401 are opposite to each other on both sides of the slide rail 302. The connecting plates 402 connect the fixed plates 401 on both sides of the slide rail 302. The shaft of the fixed pulley 403 is fixedly connected to the fixed plate 401, and the wheel portion is arranged in the slide rail 302.

[0029] In this embodiment, at least two rows of second fixed pulleys 403 are disposed in the sliding track 305 of the slide rail 302 , and the second fixed pulleys 403 are slidably connected to both side walls of the sliding track 305 .

[0030] In this embodiment, a landing gear mounting base 500 is disposed at the lower side of the horizontal pulley assembly 400 , and a tire 600 is disposed at the bottom of the landing gear mounting base 500 .

[0031] In this embodiment, the landing gear mounting base 500 is directly opposite to the inclined pad 700 disposed on the ground. The inclined pad 700 is fixed on the ground, and the plane inclination angle of the inclined pad 700 is adjustable.

[0032] When the present application is in operation, the operator uses a crane to lift the cantilever pulley track assembly 300 along the gap between the channel steel brackets 102 to the height required for the test, and at the same time places sandbags on the trapezoidal member 301 of the cantilever pulley track assembly 300 to configure the test load. The crane hook is disengaged, allowing the cantilever pulley track assembly 300 to fall freely, and the tire 600 generates an impact after contacting the inclined pad 700, and follows the horizontal pulley assembly 400 to slide horizontally, and repeats multiple loads and multiple heights to simulate multiple working conditions. A high-speed camera is used to capture the dynamic impact of the test. After the test, the state of the landing gear is analyzed, and the material captured by the high-speed camera is observed and analyzed to judge whether the landing gear has passed the test.

[0033] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A landing gear drop shock test bench, comprising a vertical track bracket, the vertical track bracket comprising a channel steel base fixed on the ground in a cross shape and a channel steel bracket vertically arranged on the channel steel base, characterized in that: The channel steel bracket includes two back-to-back opposing channel steels, and vertical pulley assemblies are arranged in the notches of the back-to-back opposing channel steels. The vertical pulley assembly moves up and down along the notches of the back-to-back opposing channel steels, and a gap is arranged between the back-to-back opposing channel steels. A cantilever pulley track assembly is fixedly connected to the vertical pulley assembly, and the cantilever pulley track assembly moves up and down along the notches of the back-to-back opposing channel steels following the vertical pulley assembly. A horizontal pulley assembly is slidably connected to the cantilever pulley track assembly, and a landing gear mounting base is arranged on the lower side of the horizontal pulley assembly, and the landing gear mounting base is directly opposite to the inclined pad arranged on the ground.

2. The landing gear drop test bench according to claim 1, characterized in that: The vertical pulley assembly includes four groups of pulley structures, and the pulley structures are symmetrically arranged in pairs in the slots of the back-to-back channel steels. Any of the pulley structures includes a pulley bracket and fixed pulleys arranged on both sides of the pulley bracket. The pulley bracket is arranged in the slot of the channel steel, and its width is smaller than the width of the slot. The fixed pulleys are arranged on both sides of the pulley bracket, and the fixed pulleys are connected to the inner wall of the slot of the channel steel, and rotate and displace along the inner wall of the slot, thereby driving the pulley bracket to displace along the slot.

3. The landing gear drop test bench according to claim 1, characterized in that: The cantilever pulley track assembly includes trapezoidal components opposite to each other on both sides of the channel steel bracket and slide rails arranged in the gaps between the channel steel brackets. After the trapezoidal components are positioned and connected by connecting pieces, they are respectively fixedly connected to the vertical pulley assemblies in the notches on both sides of the channel steel bracket. The slide rails are fixedly connected to the connecting pieces by oblique reinforcing ribs, and sliding tracks are arranged on both side end surfaces of the slide rails facing the channel steel bracket.

4. The landing gear drop test bench according to claim 3, characterized in that: The horizontal pulley assembly includes a fixed plate, a connecting plate and a plurality of fixed pulleys. The fixed plates are opposite to each other on both sides of the slide rail. The connecting plate connects the fixed plates on both sides of the slide rail. The shaft of the fixed pulley is fixedly connected to the fixed plate, and the wheel portion is arranged in the slide rail.

5. The landing gear drop test bench according to claim 4, characterized in that: No less than two rows of fixed pulleys are arranged in the sliding track of the slide rail, and fixed pulleys are slidably connected to both side walls of the sliding track.

6. The landing gear drop test bench according to claim 1, characterized in that: The landing gear mounting base is fixedly connected below the horizontal pulley assembly, and a tire is arranged at the bottom of the landing gear mounting base.

7. The landing gear drop test bench according to claim 1, characterized in that: The inclined pad is fixed on the ground, and the plane inclination angle of the inclined pad is adjustable.

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