Tri-axial six-degree-of-freedom vibration test device

Abstract

The invention discloses a triaxial six-degree-of-freedom vibration test device which comprises a base, a first air bag vibration table, a second air bag vibration table, a third air bag vibration table, a fourth air bag vibration table, a fifth air bag vibration table and a sixth air bag vibration table which are obliquely arranged are connected to the base, and air is provided for the six air bag vibration tables through fans. Supporting assemblies are hinged to the output connecting ends of the six air bag vibration tables, and the other ends of the supporting assemblies are hinged to the bottom of the table top. The whole device belongs to a small device, the functions are concentrated, compared with a large machine system with complex and diversified control objects, the control mode is more direct, major accidents caused by comprehensive collapse of the system are not prone to occurring, compact structure space layout is achieved, the space utilization problem during working of multiple queues of platforms is solved, and the working efficiency is improved. And the angle of the table top can be adjusted at multiple angles, so that the test range is widened, and the purpose of multi-angle test is achieved.

Description

Technical Field

[0001] The present invention relates to the field of spacecraft mechanical environment testing, and in particular to a tri-axial six-degree-of-freedom vibration testing device. Background Art

[0002] Existing technologies expose high-performance weaponry to multi-degree-of-freedom vibration environments. With the advancement of weaponry, there is a need for more diverse simulated vibration environments. To more realistically simulate the real-world vibration environments faced by high-performance weaponry, independent research and development of vibration testing has become a key development trend. Simulating the real-world vibration environments faced by high-performance weaponry requires a more complex testing process, greater technical difficulty, and a greater number of control factors, placing higher demands on test equipment and protocols.

[0003] Spacecraft three-axis, six-degree-of-freedom vibration testing technology is an advanced vibration testing technique that utilizes omnidirectional loading and excitation. Compared to traditional single-axis vibration testing of spacecraft products, this technology allows for simultaneous loading and excitation along all three axes during a single installation. This more realistically replicates the actual launch environment while reducing the repeated hoisting time of traditional single-axis testing, significantly improving mechanical testing efficiency.

[0004] Internationally, three-axis, six-degree-of-freedom (DOF) shaker test systems primarily utilize layouts such as 4-2-2 same-side, 4-2-2 opposite-side, 4-4-4, and 3-2-1. These systems are complex, difficult to operate, and require high technical requirements. The system primarily consists of a single-axis shaker, a work platform, a hydraulic ball-joint decoupling device, a system base, a horizontal platform base, an amplifier, and a cooling unit. The work platform serves as the mounting platform for spacecraft components in the three-axis, six-degree-of-freedom (DOF) shaker system. It connects to the dynamic coil surface of the single-axis shaker via a hydraulic ball-joint decoupling device. Ultimately, the system achieves combined motion across multiple shaker motion directions through the work platform. Therefore, the work platform plays a crucial role in three-axis, six-degree-of-freedom (DOF) vibration testing and is the core functional component of the three-axis, six-degree-of-freedom (DOF) shaker system.

[0005] The work platform is connected to the corresponding dynamic coil via a hydraulic ball-joint decoupling mechanism. Because it is not rigidly restrained laterally, the work platform can easily deviate from its geometric center. If the work platform is not adjusted to its geometric center before a triaxial, six-degree-of-freedom vibration test, the hydraulic ball-joint decoupling mechanism can easily deviate significantly during test excitation, resulting in a significant loss of force transmission and potentially causing serious damage to the decoupling mechanism or dynamic coil. Summary of the Invention

[0006] The purpose of the present invention is to provide a triaxial six-degree-of-freedom vibration test device to solve the above problems.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention provides a three-axial six-degree-of-freedom vibration test device, including a base, to which are connected inclined airbag vibration table one, airbag vibration table two, airbag vibration table three, airbag vibration table four, airbag vibration table five and airbag vibration table six, respectively provided with air by fans, the fans being placed on the outside of the base, the output connection ends of the airbag vibration table one, airbag vibration table two, airbag vibration table three, airbag vibration table four, airbag vibration table five and airbag vibration table six are all hinged to a support assembly, and the other end of the support assembly is hinged to the bottom of the table top.

[0009] Furthermore, six mounting grooves are provided on the top surface of the base, and the bottoms of the airbag vibration platform 1, airbag vibration platform 2, airbag vibration platform 3, airbag vibration platform 4, airbag vibration platform 5 and airbag vibration platform 6 are respectively connected obliquely in the mounting grooves.

[0010] Furthermore, the angles between the airbag vibration platform 1, airbag vibration platform 2, airbag vibration platform 3, airbag vibration platform 4, airbag vibration platform 5 and airbag vibration platform 6 and the base are all 60°.

[0011] Furthermore, the support assembly includes a support rod and universal joint 1 and universal joint 2 connected to the two ends of the support rod, the universal joint 1 is fixed on the output connection end of the airbag vibration table 1, airbag vibration table 2, airbag vibration table 3, airbag vibration table 4, airbag vibration table 5 and airbag vibration table 6, and the universal joint 2 is connected to the bottom surface of the table top.

[0012] Furthermore, the table top is a regular hexagonal table top, and the six corners of the bottom surface of the table top are angle a, angle b, angle c, angle d, angle e and angle f, and the six universal joints are respectively connected to angle a, angle b, angle c, angle d, angle e and angle f.

[0013] Furthermore, the universal joint 2 connected to the airbag vibration table 1 is connected to the angle b, the universal joint 2 connected to the airbag vibration table 2 is connected to the angle a, the universal joint 2 connected to the airbag vibration table 3 is connected to the angle e, the universal joint 2 connected to the airbag vibration table 4 is connected to the angle f, the universal joint 2 connected to the airbag vibration table 5 is connected to the angle c, and the universal joint 2 connected to the airbag vibration table 6 is connected to the angle d.

[0014] Furthermore, a limiting component is installed on the top end surface of the airbag vibration table one, airbag vibration table two, airbag vibration table three, airbag vibration table four, airbag vibration table five and airbag vibration table six, and the limiting component includes a mounting block and a limiting plate connected to the mounting block, the mounting block is fixed on the top end surface of the airbag vibration table one, airbag vibration table two, airbag vibration table three, airbag vibration table four, airbag vibration table five and airbag vibration table six, and the limiting plate is placed on the outside of the airbag.

[0015] Furthermore, a plurality of sensors are connected to the outer side walls of the table.

[0016] Furthermore, three hanging rings are connected to the top surface of the base, and the angle between two adjacent hanging rings is 120°.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] The present invention is a small device as a whole and has relatively concentrated functions. Compared with large-scale machine systems with complex and diverse control objects, the control method is more direct and it is not easy to cause major accidents due to a complete collapse of the system. It realizes a compact structural space layout, solves the problem of space utilization when multiple queues and platforms are working, and can adjust the angle of the table at multiple angles, thereby increasing the test range and achieving the purpose of multi-angle testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the main structure of the tri-axial six-degree-of-freedom vibration test device of the present invention;

[0021] Figure 2 A top view of the airbag vibration table;

[0022] Figure 3 It is a side view of the limit assembly;

[0023] Figure 4 Schematic diagram of the supporting component structure;

[0024] Figure 5 Schematic diagram of the table structure;

[0025] Explanation of the accompanying reference numerals: 1. Base; 2. Airbag vibration table 1; 3. Airbag vibration table 2; 4. Airbag vibration table 3; 5. Airbag vibration table 4; 6. Airbag vibration table 5; 7. Airbag vibration table 6; 8. Table top; 9. Mounting groove; 10. Support rod; 11. Universal joint 1; 12. Universal joint 2; 13. Mounting block; 14. Limiting plate; 15. Lifting ring. DETAILED DESCRIPTION

[0026] like Figure 1-5 As shown, a triaxial six-degree-of-freedom vibration test device includes a base 1, to which are connected obliquely arranged airbag vibration platform 1 2, airbag vibration platform 2 3, airbag vibration platform 3 4, airbag vibration platform 4 5, airbag vibration platform 5 6, and airbag vibration platform 6 7. Six mounting slots 9 are defined on the top surface of the base 1, and the bottoms of the airbag vibration platforms 1 2, 3, 4, 5, 6, and 7 are obliquely connected to the mounting slots 9. By providing the mounting slots 9 on the base 1, the mounting structures at the bottom of the airbag vibration platforms do not occupy space at the top of the base 1.

[0027] The angles between the airbag vibration platform 1 2 , airbag vibration platform 2 3 , airbag vibration platform 3 4 , airbag vibration platform 4 5 , airbag vibration platform 5 6 and airbag vibration platform 6 7 and the base 1 are all 60°.

[0028] The airbag vibration table 1 2 , airbag vibration table 2 3 , airbag vibration table 3 4 , airbag vibration table 4 5 , airbag vibration table 5 6 and airbag vibration table 6 7 are respectively provided with air through fans, and the fans are placed on the outside of the base 1 .

[0029] The output connection ends of the airbag vibration table 1 2 , airbag vibration table 2 3 , airbag vibration table 3 4 , airbag vibration table 4 5 , airbag vibration table 5 6 and airbag vibration table 6 7 are all hinged to a support assembly, and the other end of the support assembly is hinged to the bottom of the table top 8 .

[0030] The support assembly includes a support rod 10 and a universal joint 11 and a universal joint 2 12 connected to the two ends of the support rod 10. The universal joint 11 is fixed on the output connection ends of the airbag vibration table 1 2, the airbag vibration table 2 3, the airbag vibration table 3 4, the airbag vibration table 4 5, the airbag vibration table 5 6 and the airbag vibration table 6 7. The universal joint 2 12 is connected to the bottom surface of the table top 8.

[0031] The table top 8 is a regular hexagonal table top, and the six corners of the bottom surface of the table top 8 are angle a, angle b, angle c, angle d, angle e and angle f respectively. The six universal joints 12 are respectively connected to the angle a, angle b, angle c, angle d, angle e and angle f.

[0032] The universal joint 12 connected to the airbag vibration table 1 2 is connected to the angle b, the universal joint 12 connected to the airbag vibration table 2 3 is connected to the angle a, the universal joint 12 connected to the airbag vibration table 3 4 is connected to the angle e, the universal joint 12 connected to the airbag vibration table 4 5 is connected to the angle f, the universal joint 12 connected to the airbag vibration table 5 6 is connected to the angle c, and the universal joint 12 connected to the airbag vibration table 6 7 is connected to the angle d.

[0033] A limiting component is installed on the top end faces of the airbag vibration table 1 2, airbag vibration table 2 3, airbag vibration table 3 4, airbag vibration table 4 5, airbag vibration table 5 6 and airbag vibration table 6 7, and the limiting component includes a mounting block 13 and a limiting plate 14 connected to the mounting block 13. The mounting block 13 is fixed on the top end faces of the airbag vibration table 1 2, airbag vibration table 2 3, airbag vibration table 3 4, airbag vibration table 4 5, airbag vibration table 5 6 and airbag vibration table 6 7, and the limiting plate 14 is placed on the outside of the airbag.

[0034] Several sensors are connected to the outer side walls of the table top 8 , and the horizontal positions of the table top 8 at various angles are sensed by the sensors.

[0035] Three lifting rings 15 are connected to the top surface of the base 1 , and the angle between two adjacent lifting rings 15 is 120°. The base 1 is lifted by the lifting rings 15 .

[0036] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A triaxial six-degree-of-freedom vibration test device, characterized by: The invention comprises a base (1), wherein the base (1) is connected with an inclined airbag vibration table 1 (2), an airbag vibration table 2 (3), an airbag vibration table 3 (4), an airbag vibration table 4 (5), an airbag vibration table 5 (6) and an airbag vibration table 6 (7), wherein the airbag vibration table 1 (2), the airbag vibration table 2 (3), the airbag vibration table 3 (4), the airbag vibration table 4 (5), the airbag vibration table 5 (6) and the airbag vibration table 6 (7) are respectively provided with air by a fan, wherein the fan is placed on the outside of the base (1), and the output connection ends of the airbag vibration table 1 (2), the airbag vibration table 2 (3), the airbag vibration table 3 (4), the airbag vibration table 4 (5), the airbag vibration table 5 (6) and the airbag vibration table 6 (7) are all hinged with a support assembly, and the other end of the support assembly is hinged with the bottom of the table top (8).

2. The triaxial six-degree-of-freedom vibration test device according to claim 1, characterized in that: Six mounting grooves (9) are provided on the top surface of the base (1), and the bottoms of the airbag vibration platform 1 (2), airbag vibration platform 2 (3), airbag vibration platform 3 (4), airbag vibration platform 4 (5), airbag vibration platform 5 (6) and airbag vibration platform 6 (7) are respectively connected in an inclined manner in the mounting grooves (9).

3. The triaxial six-degree-of-freedom vibration test device according to claim 2, characterized in that: The angles between the airbag vibration table 1 (2), the airbag vibration table 2 (3), the airbag vibration table 3 (4), the airbag vibration table 4 (5), the airbag vibration table 5 (6) and the airbag vibration table 6 (7) and the base (1) are all 60°.

4. The triaxial six-degree-of-freedom vibration test device according to claim 1, characterized in that: The support assembly includes a support rod (10) and a universal joint 1 (11) and a universal joint 2 (12) connected to both ends of the support rod (10); the universal joint 1 (11) is fixed to the output connection ends of the airbag vibration table 1 (2), the airbag vibration table 2 (3), the airbag vibration table 3 (4), the airbag vibration table 4 (5), the airbag vibration table 5 (6) and the airbag vibration table 6 (7); the universal joint 2 (12) is connected to the bottom surface of the table top (8).

5. The triaxial six-degree-of-freedom vibration test device according to claim 4, characterized in that: The table top (8) is a regular hexagonal table top, and the six corners of the bottom surface of the table top (8) are respectively angle a, angle b, angle c, angle d, angle e and angle f, and the six universal joints (12) are respectively connected to the angle a, angle b, angle c, angle d, angle e and angle f.

6. The triaxial six-degree-of-freedom vibration test device according to claim 5, characterized in that: The universal joint 2 (12) connected to the airbag vibration table 1 (2) is connected to the angle b, the universal joint 2 (12) connected to the airbag vibration table 2 (3) is connected to the angle a, the universal joint 2 (12) connected to the airbag vibration table 3 (4) is connected to the angle e, the universal joint 2 (12) connected to the airbag vibration table 4 (5) is connected to the angle f, the universal joint 2 (12) connected to the airbag vibration table 5 (6) is connected to the angle c, and the universal joint 2 (12) connected to the airbag vibration table 6 (7) is connected to the angle d.

7. The triaxial six-degree-of-freedom vibration test device according to claim 1, characterized in that: A limiting assembly is installed on the top end surfaces of the airbag vibration table one (2), the airbag vibration table two (3), the airbag vibration table three (4), the airbag vibration table four (5), the airbag vibration table five (6) and the airbag vibration table six (7), and the limiting assembly includes a mounting block (13) and a limiting plate (14) connected to the mounting block (13). The mounting block (13) is fixed on the top end surfaces of the airbag vibration table one (2), the airbag vibration table two (3), the airbag vibration table three (4), the airbag vibration table four (5), the airbag vibration table five (6) and the airbag vibration table six (7), and the limiting plate (14) is placed on the outside of the airbag.

8. The triaxial six-degree-of-freedom vibration test device according to claim 1, characterized in that: Several sensors are connected to the outer side walls of the table (8).

9. The triaxial six-degree-of-freedom vibration test device according to claim 1, characterized in that: Three hanging rings (15) are connected to the top surface of the base (1), and the angle between two adjacent hanging rings (15) is 120°.

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