Large-scale electronic equipment vibration test device

Abstract

The invention relates to the technical field of vibration test equipment, aims to solve the problems that a traditional portal frame type test device is large in weight and weak in rigidity, and after the traditional portal frame type test device is combined with large electronic equipment, resonance is generated with the electronic equipment under excitation of a vibration table, the electronic equipment is possibly damaged, and the test fails, and provides a vibration test device for the large electronic equipment. Comprising a base and a connecting bin, the base is in a long strip shape, the connecting bin is fixedly installed on the top face of the base, the connecting bin is arranged at one end of the base and used for simulating the installation position of to-be-tested equipment on an airplane, the two sides of the connecting bin are used for being connected with the to-be-tested equipment, and the length direction of the to-be-tested equipment is consistent with the length direction of the base; the base and the connecting bin adopt light damping structural members; the test device can better simulate the real situation, the inherent frequency of the test device is improved, resonance between the test device and the electronic equipment under excitation of the vibration table is avoided, the electronic equipment is prevented from being damaged, and it is guaranteed that the test is conducted smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration test equipment, and in particular to a vibration test device for large electronic equipment. Background Art

[0002] When conducting vibration tests on large electronic equipment, it is necessary to design a ground test device to simulate the actual state of the equipment under test and evaluate the reliability and safety of the equipment under test. Under certain vibration conditions, the total weight of the system under test (including the device, the equipment under test, the vibration table, the dynamic coil, etc.) must be less than the maximum driving mass of the excitation source under the vibration conditions. Generally, the ratio of the total weight of the system under test to the maximum driving mass of the excitation source under the vibration conditions should be less than 60%. If the driving mass ratio is greater than 60%, it is necessary to communicate and confirm with the test party.

[0003] At present, traditional large electronic equipment, especially aircraft external attachments (such as electronic pods or wingtip pods), has a large slenderness ratio, and the test equipment is in the form of a gantry. The traditional gantry test equipment is generally welded from steel plates. The structure of the traditional gantry test equipment is as follows: Figure 1 shown.

[0004] Due to the uniqueness of the equipment under test in terms of weight, structure, appearance design, material, etc., ordinary fixed gantry test equipment (vibration equipment) is generally made of steel, which is generally heavy and weak in rigidity. The first-order natural frequency of such test equipment generally does not exceed 100Hz, while the vibration test frequency range of such large electronic equipment is generally 20Hz~500Hz. Figure 1 The first four natural frequencies of the gantry test device shown are 95.5 Hz, 137.3 Hz, 151.1 Hz and 226.3 Hz respectively. Figure 2-Figure 5 shown.

[0005] When the traditional gantry-type test device is combined with large electronic equipment, the resonance peak in the low frequency band under the excitation of the vibration table will cause the response of the electronic equipment to be too large, especially for equipment with a large aspect ratio. The main load-bearing frame at the end may have amplified acceleration spikes. When the stress range of the material is exceeded, deformation, fracture and other failures will occur, resulting in test failure. Summary of the invention

[0006] The present invention aims to provide a large-scale electronic equipment vibration test device to solve the problem that the traditional gantry-type test device is heavy and weak in rigidity. After being combined with the large electronic equipment, it resonates with the electronic equipment under the excitation of the vibration table, which may damage the electronic equipment and cause the test failure.

[0007] The present invention is achieved by adopting the following technical solutions:

[0008] The present invention provides a large-scale electronic equipment vibration test device, comprising a base and a connecting chamber, wherein the base is in an elongated strip shape, the connecting chamber is fixedly mounted on the top surface of the base, and the connecting chamber is arranged at one end of the base, and is used to simulate the installation position of the device to be tested on an airplane, and both sides of the connecting chamber are used to connect the device to be tested, and the length direction of the device to be tested is consistent with the length direction of the base; the base and the connecting chamber adopt lightweight damping structural parts.

[0009] Among them, the lightweight damping structural parts refer to structural parts that combine lightweight design and high damping characteristics. Such structural parts can not only effectively reduce the mass, but also significantly improve the damping performance of the system, thereby reducing vibration and noise and improving the stability and reliability of the system.

[0010] As the preferred technical solution:

[0011] The base and the connecting compartment are made of aluminum alloy or magnesium alloy.

[0012] As the preferred technical solution:

[0013] The materials of the base and the connecting compartment are not limited to the above two materials. Other composite materials with light weight and good damping performance can also be used, for example, carbon fiber composite materials, which have high strength (the strength is 7 to 9 times that of steel), light weight (specific gravity is less than 1 / 4 of steel), and high damping performance.

[0014] As the preferred technical solution:

[0015] The base is a boat-shaped base, and the boat-shaped base is in the shape of a hull.

[0016] As the preferred technical solution:

[0017] The boat-shaped base is a symmetrical structure.

[0018] As the preferred technical solution:

[0019] The ship-shaped base adopts a truss structure, and the ship-shaped base includes a plurality of main trusses arranged at intervals, and the length direction of the main trusses is along the longitudinal direction; transverse trusses are connected between the plurality of main trusses, and the length direction of the transverse trusses is along the transverse direction;

[0020] The ship-shaped base also includes a top plate, which is located on the top surface of each main truss. The main truss is connected with the transverse truss and the top plate to form a whole.

[0021] The use of a truss structure is conducive to further weight reduction.

[0022] As the preferred technical solution:

[0023] The main truss is in a ship shape, and the transverse truss is in a rectangular shape.

[0024] As the preferred technical solution:

[0025] The top plate is a planar structure and is provided with a plurality of connection holes.

[0026] As the preferred technical solution:

[0027] The base is installed on the table top of the vibration table. The vibration table gradually expands from a circle to a long rectangle from bottom to top. The shape of the table top of the vibration table is matched with the shape of the bottom surface of the base.

[0028] As the preferred technical solution:

[0029] The connection chamber adopts a rectangular connection chamber, and the side plates on both sides of the rectangular connection chamber are symmetrically provided with strip holes, and the strip holes are used to cooperate with the protrusions on the device to be tested;

[0030] Positioning pins are also symmetrically arranged on the side plates on both sides of the rectangular connection compartment, and the positioning pins are used to position the device to be tested;

[0031] A plurality of connection holes are arranged on the side plates on both sides of the rectangular connection bin.

[0032] As the preferred technical solution:

[0033] The rectangular connection bin includes a plurality of bin bodies.

[0034] The use of multiple silo structures is conducive to further weight reduction.

[0035] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0036] 1. The present invention simulates the installation position of the device to be tested on the aircraft through a long strip base and a connecting compartment located at one end of the top surface of the base, so that the test process is closer to the actual situation. The base and the connecting compartment adopt lightweight damping structural parts. While ensuring the rigidity and strength of the test device, the weight of the test device is reduced, the first-order natural frequency of the test device is effectively improved, and it has good damping characteristics. The good damping characteristics can quickly dissipate vibration energy and reduce the vibration amplitude, thereby indirectly improving the natural frequency of the test device, avoiding resonance between the test device and the electronic equipment under the excitation of the vibration table, avoiding damage to the electronic equipment, and ensuring the smooth progress of the test.

[0037] 2. The test device of the present invention adopts aluminum alloy or magnesium alloy, which has good damping characteristics, light weight, high rigidity and strength. Reducing weight can better control the first-order natural frequency of the test device. Good damping characteristics can quickly dissipate vibration energy and reduce vibration amplitude, thereby indirectly improving the natural frequency of the test device. It has high rigidity and is not easy to deform. When the vibration table generates vibration, it can reduce the transmission distortion. The ideal state is to allow energy to be transmitted to the electronic equipment without distortion to simulate the vibration conditions in the actual working environment and ensure the smooth progress of the test.

[0038] 3. The ship-shaped base of the present invention adopts a truss structure, and the rectangular connecting warehouse adopts a structure of multiple warehouse bodies, which achieves weight reduction while ensuring strength and effectively improves the first-order natural frequency of the test device.

[0039] 4. The vibration table of the present invention gradually expands from a circle to a long rectangle from bottom to top, and the shape of the vibration table surface is adapted to the shape of the bottom surface of the base. In this way, the mass and moment of inertia of the vibration table are similar to those of the device to be tested, ensuring that the center of gravity of the large electronic device is consistent with the center of the vibration table surface or the thrust axis, and better matching its vibration characteristics.

[0040] 5. The test device of the present invention is provided with a plurality of mounting holes, which can not only realize a reliable mechanical connection between the device to be tested and the test device, but also can fully adapt to the test requirements of the device to be tested.

[0041] 6. The connection surface between the test device of the present invention and the device to be tested is flat, the connection parts are numerous and evenly arranged, the force is evenly applied, and the load is transmitted smoothly.

[0042] 7. The connection bin of the present invention matches the protrusion on the device to be tested through the strip hole, positions the device to be tested through the positioning pin, and connects to the device to be tested by installing a connecting piece in the connection hole, thereby achieving a stable and reliable mechanical connection between the device to be tested and the test device, preventing the device to be tested from loosening or falling off during vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the structure of a traditional gantry test device.

[0044] Figure 2 Schematic diagram of the first-order natural frequency and mode of the traditional gantry test device.

[0045] Figure 3 Schematic diagram of the second-order natural frequency and mode of the traditional gantry test device.

[0046] Figure 4 Schematic diagram of the third-order natural frequency and mode of the traditional gantry test device.

[0047] Figure 5Schematic diagram of the fourth-order natural frequency and mode of the traditional gantry test device.

[0048] Figure 6 The structure of the large electronic equipment vibration test device of the present invention is shown in FIG. Figure 1 .

[0049] Figure 7 The structure of the large electronic equipment vibration test device of the present invention is shown in FIG. Figure 2 .

[0050] Figure 8 It is a schematic diagram of the first-order natural frequency and mode of the large electronic equipment vibration test device described in the present invention.

[0051] Fig. 9 It is a schematic diagram of the second-order natural frequency and mode of the large electronic equipment vibration test device described in the present invention.

[0052] Fig.10 It is a schematic diagram of the third-order natural frequency and mode of the large electronic equipment vibration test device described in the present invention.

[0053] Fig.11 It is a schematic diagram of the fourth-order natural frequency and mode of the large electronic equipment vibration test device described in the present invention.

[0054] Fig.12 This is a schematic diagram of the arrangement of the control points described in the present invention.

[0055] Fig.13 It is a schematic diagram of the arrangement of corresponding points described in the present invention.

[0056] Icon: 1- ship-shaped base, 101- main truss, 102- transverse truss, 103- top plate, 2- rectangular connecting bin, 201- bar hole, 202- positioning pin, 203- bin body, 3- equipment to be tested, 4- connecting hole. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Example 1

[0059] like Figure 6 and Figure 7As shown, this embodiment proposes a large-scale electronic equipment vibration test device, including a base and a connecting warehouse, wherein the base is long and narrow, the connecting warehouse is fixedly mounted on the top surface of the base, and the connecting warehouse is arranged at one end of the base, and is used to simulate the installation position of the device under test 3 on the aircraft, simulating a real application scenario, similar to the island structure of an aircraft carrier, and both sides of the connecting warehouse are used to connect the device under test 3, and the length direction of the device under test 3 is consistent with the length direction of the base.

[0060] In this embodiment, the base adopts a boat-shaped base 1, and the boat-shaped base 1 is in the shape of a hull, with a bow and a stern. The boat-shaped base 1 is a symmetrical structure with two symmetrical planes. The boat-shaped base 1 adopts a truss structure, and the boat-shaped base 1 includes a plurality of evenly and spaced main trusses 101, the length direction of the main trusses 101 is along the longitudinal direction, and the shape of the main trusses 101 is boat-shaped, and a transverse truss 102 is connected between the plurality of main trusses 101, the length direction of the transverse trusses 102 is along the transverse direction, and the shape of the transverse trusses 102 is rectangular; the boat-shaped base 1 also includes a top plate 103, and the top plate 103 is located on the top surface of each of the main trusses 101, and the main trusses 101 are connected to the transverse trusses 102 and the top plate 103 to form a whole. The use of a truss structure can achieve weight reduction, effectively improve the first-order natural frequency of the test device, and ensure a high structural strength. The top plate 103 is a planar structure, and a plurality of connection holes 4 are provided on the top plate 103 to facilitate connection of the device under test 3 with the boat-shaped base 1 , and the connection method may be screw or bolt connection.

[0061] The base adopts a ship-shaped structure to simulate the interface of an aircraft wing. The base is installed on the table of the vibration table. The vibration table gradually expands from a circle to a long rectangle from bottom to top. The shape of the vibration table surface is adapted to the shape of the bottom surface of the base. In this way, the mass and moment of inertia of the vibration table are similar to those of the device to be tested 3, ensuring that the center of gravity of the large electronic equipment is consistent with the center of the vibration table surface or the thrust axis, and better matching its vibration characteristics. Through simulation calculation and analysis, the structural dimensions of the main truss 101 and the transverse truss 102 are optimized. At the same time, in order to protect the table and match the dynamic characteristics of the vibration table, the two main trusses 101 located on the outside of the base can refer to the gradual change of the hull, and the distance between the two gradually increases from bottom to top. The gradual transition method can be used to optimize the mode of the test device.

[0062] The base is not limited to the boat-shaped base 1, and other long strip structures can be replaced in theory. However, considering the strength and vibration level, the boat-shaped base 1 is the preferred method.

[0063] In this embodiment, the connection chamber adopts a rectangular connection chamber 2, and the side panels on both sides of the rectangular connection chamber 2 are symmetrically provided with strip holes 201, and the strip holes 201 are used to match the protrusions on the device to be tested 3. When the device to be tested 3 is installed on the side of the rectangular connection chamber 2, the protrusions on the device to be tested 3 are inserted into the corresponding strip holes 201. The side panels on both sides of the rectangular connection chamber 2 are also symmetrically provided with positioning pins 202, and the positioning pins 202 are used to position the device to be tested 3. A plurality of connection holes 4 are provided on the side panels on both sides of the rectangular connection chamber 2, which are convenient for connecting the device to be tested 3 with the rectangular connection chamber 2, and the connection method can be screw or bolt connection. Through the above structure, a stable and reliable mechanical connection between the device to be tested 3 and the test device can be achieved, and the device to be tested 3 can be prevented from loosening or falling off during vibration. The connection surface between the connection chamber and the device to be tested 3 has a good flatness, and 80 evenly distributed bolts are used to connect it, and there are many connecting parts and they are evenly arranged, so that it is evenly stressed and the load is transmitted smoothly.

[0064] The rectangular connection bin 2 in this embodiment includes a plurality of bin bodies 203 , which is beneficial to reducing the weight of the rectangular connection bin 2 and effectively improving the first-order natural frequency of the test device.

[0065] The test device of the present invention has installation holes reserved throughout the body, which can fully adapt to the test requirements of the device to be tested 3.

[0066] In this embodiment, the base and the connection chamber are made of aluminum alloy or magnesium alloy, and the base and the connection chamber are connected by welding. Aluminum alloy and magnesium alloy have good rigidity and strength, and can reduce the distortion of transmission when the vibration table generates vibration. The ideal state is to allow energy to be transmitted to the electronic equipment without distortion to simulate the vibration conditions in the actual working environment. The test device is made of aluminum alloy or magnesium alloy, which has good damping characteristics, reduces the weight of the test device, and improves its rigidity. Reducing the weight can better control the first-order natural frequency of the test device. Good damping characteristics can quickly dissipate vibration energy and reduce the vibration amplitude, thereby indirectly increasing the natural frequency of the test device.

[0067] The test device of the present invention is mainly used for vibration testing of the device under test 3 to ensure that the vibration energy can be effectively transferred to the device under test 3 during the test process, thereby achieving accurate testing and evaluation of the vibration characteristics of the device under test 3.

[0068] The base of the present invention adopts a ship-shaped design, which effectively increases the first-order natural frequency of the test device. Figure 8-Figure 11 As shown, the first four natural frequencies of the test device are 247.6 Hz, 255.84 Hz, 333.74 Hz, and 359.8 Hz respectively.

[0069] The first-order natural frequency of the test device should be higher than 1.5 times the first-order natural frequency of the object to be tested. In this way, the resonance of the device to be tested 3 due to the vibration of the test device can be avoided, thereby causing the input load to increase. The first-order natural frequency of the test device of the present invention is 247.6Hz, which is much higher than the first-order natural frequency of the traditional gantry device of 95.5Hz. The higher natural frequency enhances the ability of the test device to resist deformation and ensures the accuracy of the load transferred to the physical load to be tested. By comparing the modal vibration shapes of the traditional gantry test device and the test device of the present invention, it can be seen that under the same load conditions, the deformation of the device to be tested 3 at the installation position of the test device of the present invention is smaller than the deformation of the installation position of the traditional gantry test device, which makes the load at the installation point of the device to be tested 3 closer to the actual input load, and the vibration transmission has higher accuracy.

[0070] Taking the device to be tested 3 as a wingtip tank as an example, the wingtip tank is installed on both sides of the connection tank of the test device, and three control points are arranged in the Y direction, namely control point 1, control point 2 and control point 3. The control points are arranged in a front, middle and back three-point layout. The control point 1 is located at the rear end of the connection tank, the control point 2 is located in the middle of the connection tank, and the control point 3 is located on the front top surface of the ship-shaped base 1. Fig.12 Then, three vibration response points are arranged, namely, response point 1, response point 2 and response point 3. The response point 1 is located at the front top of the device under test 3, the response point 2 is located at the rear side end surface of the device under test 3, and the response point 3 is located at the front top surface of the boat-shaped base 1, as shown in FIG. Fig.13 As shown, vibration sensors are installed at various vibration response points, and the test results are shown in the following table:

[0071] Table 1 Test results of response value of vibration sensor response point

[0072]

[0073]

[0074] According to the above results, through the integration of the front, middle and back three measurement points, the weighted average comprehensive control is 4.1g, which is close to the collection response value under the actual working conditions, meets the assessment requirements and reduces the risk of excessive testing.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large electronic equipment vibration test device, characterized in that: The invention comprises a base and a connecting chamber, wherein the base is in an elongated strip shape, the connecting chamber is fixedly mounted on the top surface of the base, and the connecting chamber is arranged at one end of the base, and is used to simulate the installation position of the device to be tested on the aircraft, and the two sides of the connecting chamber are used to connect the device to be tested, and the length direction of the device to be tested is consistent with the length direction of the base; the base and the connecting chamber adopt lightweight damping structural parts.

2. The large electronic equipment vibration test device according to claim 1, characterized in that: The base and the connecting compartment are made of aluminum alloy or magnesium alloy.

3. The large electronic equipment vibration test device according to claim 1, characterized in that: The base is a boat-shaped base, and the boat-shaped base is in the shape of a hull.

4. The large electronic equipment vibration test device according to claim 3, characterized in that: The boat-shaped base is a symmetrical structure.

5. The large electronic equipment vibration test device according to claim 3, characterized in that: The ship-shaped base adopts a truss structure, and the ship-shaped base includes a plurality of main trusses arranged at intervals, and the length direction of the main trusses is along the longitudinal direction; transverse trusses are connected between the plurality of main trusses, and the length direction of the transverse trusses is along the transverse direction; The ship-shaped base also includes a top plate, which is located on the top surface of each main truss. The main truss is connected with the transverse truss and the top plate to form a whole.

6. The large electronic equipment vibration test device according to claim 5, characterized in that: The main truss is in a ship shape, and the transverse truss is in a rectangular shape.

7. The large electronic equipment vibration test device according to claim 5, characterized in that: The top plate is a planar structure and is provided with a plurality of connection holes.

8. The large electronic equipment vibration test device according to claim 1, characterized in that: The base is installed on the table top of the vibration table. The vibration table gradually expands from a circle to a long rectangle from bottom to top. The shape of the table top of the vibration table is matched with the shape of the bottom surface of the base.

9. The large electronic equipment vibration test device according to claim 1, characterized in that: The connection chamber adopts a rectangular connection chamber, and the side plates on both sides of the rectangular connection chamber are symmetrically provided with strip holes, and the strip holes are used to cooperate with the protrusions on the device to be tested; Positioning pins are also symmetrically arranged on the side plates on both sides of the rectangular connection compartment, and the positioning pins are used to position the device to be tested; A plurality of connection holes are arranged on the side plates on both sides of the rectangular connection bin.

10. The large electronic equipment vibration test device according to claim 9, characterized in that: The rectangular connection bin includes a plurality of bin bodies.

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