A high-bearing anti-overturning triaxial vibration test device

Abstract

The application provides a high-load anti-overturning triaxial vibration test device which uses air springs as main load-bearing and anti-overturning structures. The test system table of the device is connected with four groups of air springs on the fixed support through four support arms. Each support arm is connected with the air spring above and below. The static load of the test product and the table can be borne by the air spring. The table size design and the vibration table thrust selection are more flexible, and the test requirements of the large-size and large-mass test product can be met. By selecting air springs of different specifications and adjusting the pressure of the air springs above and below the different support arms, the product mass eccentricity or installation offset can also be adapted.

Description

Technical Field

[0001] This invention belongs to the field of dynamic testing, specifically relating to a high-load-bearing, anti-overturning triaxial vibration testing device. Background Technology

[0002] As spacecraft missions become more complex and design requirements increase, the consistency between space and ground in spacecraft vibration testing is becoming increasingly stringent. The preferred testing methods are shifting from sequential loading of single-axis vibrations to simultaneous loading of multi-axis vibrations. The types of tested products are also expanding from small, lightweight, and uniformly mass-distributed single-unit equipment or systems such as gyro-stabilized platforms and inertial measurement units to complex structures or products with larger dimensions, heavier weights, and uneven mass distributions, such as rudders / wings, modules, and liquid-filled tanks. Traditional triaxial vibration testing equipment is small in scale and compact in structure, but the static load and mass eccentricity of the tested products are mainly borne by the vibration table itself below, or by rubber rope suspension above the table. This results in limited load-bearing and anti-eccentricity capabilities, and the suspension system above can interfere with the installation of larger modules or rudder / wing systems requiring eccentric mounting.

[0003] To adapt to the diverse requirements of the tested products and solve the problems of existing small-scale triaxial vibration testing systems, this invention develops a high-load-bearing and anti-overturning triaxial vibration testing device that uses air springs as the main load-bearing and anti-overturning structure. The device has more flexible table size design and vibration table thrust selection, and can adapt to situations such as large tested product size, eccentric installation, uneven mass distribution and center of mass change, and can meet the loading requirements of triaxial vibration tests over a wider range. Summary of the Invention

[0004] As the requirements for spacecraft vibration testing increase, the types of products requiring triaxial vibration testing are gradually expanding, from smaller single-unit equipment to various structures with large mass, large size, and non-uniform distribution, such as modules, rudder / wing surfaces, and liquid-filled tanks. Traditional, smaller-scale, and more compact triaxial vibration testing equipment is insufficient to meet the increasingly complex and diverse needs of the tested products.

[0005] To address the limitations of existing small-scale triaxial vibration testing devices, this invention proposes a high-load-bearing, anti-overturning triaxial vibration testing device. The device's platform is connected to four sets of air springs on a fixed support via four support arms. Each support arm is connected to air springs at both the top and bottom. The static load of the test product and the platform can be borne by the air springs. This allows for greater flexibility in platform size design and vibration table thrust selection, meeting the testing requirements of large-sized, high-mass test products. By selecting different specifications of air springs and adjusting the pressure of the air springs above and below the support arms, the device can also accommodate situations where the product's mass is eccentric or the installation is offset.

[0006] A high load-bearing and anti-overturning triaxial vibration testing device includes a triaxial excitation system and a load-bearing and anti-overturning system connected to each other. The triaxial excitation system includes three vibration tables erected vertically in pairs. The load-bearing and anti-overturning system includes a support arm assembly and an air spring connected to the triaxial excitation system.

[0007] The triaxial vibration system also includes a test system platform, hydraulic ball heads, ball head mounting adapter plates, and adapter rods. The test system platform serves as the center, with three vibration tables arranged vertically in pairs. The vertical vibration tables are fixed to the foundation, while the two horizontal vibration tables are fixed to vibration table mounting bases that are connected to the foundation. The hydraulic ball heads are arranged in pairs and connected to the three vibration tables through the ball head mounting adapter plates, and then each is connected to the test system platform through adapter rods.

[0008] Furthermore, the upper surface of the test system platform is square, and the lower structure is an octagonal prism.

[0009] Furthermore, the bottom surface of the test system platform and the two mutually perpendicular surfaces corresponding to the two adjacent sides of the upper surface of the square are used to connect with the transition rod, and the four surfaces corresponding to the four corners of the upper surface of the square are connected with the load-bearing anti-overturning system.

[0010] Furthermore, the hydraulic ball head is a high-frequency hydraulic ball head.

[0011] Furthermore, the load-bearing anti-overturning system also includes an air spring mounting plate one, an air spring mounting plate two, a fixed support base, an air spring support frame, and limiting blocks. The support arm assembly consists of four support arms. Each support arm has an air spring mounted on its upper and lower surfaces via an air spring mounting plate one. The lower surface of the air spring below the support arm is connected to the fixed support base via an air spring mounting plate two, and the upper surface of the air spring above the support arm is connected to the air spring support frame via an air spring mounting plate two. A pair of limiting blocks are fixed to the side wall of the air spring support frame, and the cantilever end of the support arm is located between the upper and lower inner surfaces of the limiting blocks.

[0012] Furthermore, the load-bearing anti-overturning system also includes a pair of limiting blocks fixed to the side wall of the air spring support frame, with the cantilever end of the support arm located between the upper and lower inner surfaces of the limiting blocks.

[0013] Furthermore, the vertical plate of the support arm is connected to the sides and bottom of the four corners of the test system platform.

[0014] The beneficial effects of this invention are as follows:

[0015] The high load-bearing and anti-overturning triaxial vibration test device of the present invention uses air springs as the main load-bearing and anti-overturning structure, which can adapt to more types of test products with larger size, mass eccentricity and center of mass change, etc. The system has more flexible table size design and vibration table thrust selection, which can meet the loading requirements of a wider range of triaxial vibration tests. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a triaxial excitation system;

[0017] Among them, 1-vibration table, 2-ball head mounting adapter plate, 3-high frequency hydraulic ball head, 4-adapter connecting rod, 5-vibration table fixed base, 6-test system table surface, 7-triaxial excitation system

[0018] Figure 2 This is a schematic diagram of the load-bearing and anti-overturning system;

[0019] Among them, 8-support arm assembly, 9-air spring, 10-air spring mounting plate one (support arm end), 11-air spring mounting plate two (support limiting system end), 12-fixed support base, 13-air spring support frame, 14-limiting block, 15-support arm and air spring combination, 16-support limiting system, 17-load-bearing anti-overturning system

[0020] Figure 3 This is a schematic diagram of the assembly of a high-load-bearing, anti-overturning triaxial vibration testing device. Detailed Implementation

[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.

[0022] 1. Triaxial excitation system

[0023] Figure 1This is a schematic diagram of the triaxial vibration system 7 of the present invention. The system centers on the test system platform 6, with three vibration tables 1 arranged perpendicularly in pairs, forming a triaxial loading unit. The vertical vibration tables are fixed to the foundation, while the two horizontal vibration tables are fixed to vibration table mounting bases 5, which are also connected to the foundation. Six high-frequency hydraulic ball heads 3 are arranged in pairs, connected to the three vibration tables 1 via ball head mounting adapter plates 2, and then connected to the test system platform 6 via adapter rods 4, forming a non-rigid connection. This connection method, due to the high-frequency transmission and self-rotation capabilities of the hydraulic ball heads within a certain range, achieves triaxial motion decoupling, allowing simultaneous application of vibrations in three directions. The axes of the two parallel high-frequency hydraulic ball heads in each group form a plane, and the three planes of the three groups of ball heads are perpendicular to each other, constraining the additional angular motion caused by the rotation of the ball heads and ensuring the accuracy of the triaxial linear vibration input. The upper surface of the test system platform 6 is square for easy product installation; the lower structure is an octagonal prism, with the bottom surface and two mutually perpendicular faces corresponding to the two sides of the square upper surface used to connect to the adapter rod, and the four faces corresponding to the four corners of the square upper surface connected to the load-bearing anti-overturning system. The adapter rod 4 is used to adjust the distance between the vibration table and the test system platform; its length can be designed and manufactured as needed to avoid interference with the installation space of the equipment or the tested product.

[0024] 2. Load-bearing anti-overturning system

[0025] Figure 2 This is a schematic diagram of the load-bearing anti-overturning system 17 of the present invention. The support arm assembly 8 consists of four support arms, with the vertical plates of the support arms connected to the sides and bottom surfaces at the four corners of the test system platform 6. Each support arm has an air spring 9 mounted on its upper and lower surfaces via an air spring mounting plate 1 (support arm end) 10. The lower surface of the air spring 9 below the support arm is connected to the fixed support base 12 via an air spring mounting plate 2 (support limiting system end) 11. The upper surface of the air spring 9 above the support arm is connected to the air spring support frame 13 via the air spring mounting plate 2 (support limiting system end) 11. By adjusting the position and pressure of the upper and lower air springs of each support arm, the system can adapt to the needs of large mass or mass eccentricity of the test specimen. Limiting blocks 14 are fixed to the side wall of the air spring support frame 13. A pair of limiting blocks are symmetrically installed on each support frame, with the cantilever end of the support arm located between the upper and lower inner surfaces of the limiting blocks, thus preventing the system from overturning.

[0026] 3. Assembly of the test apparatus

[0027] Figure 3This is a schematic diagram of a high-load-bearing, overturning-resistant triaxial vibration test apparatus assembled from the triaxial excitation system and the load-bearing anti-overturning system. The connecting rod 4, the vibration table base 5, and the fixed support 12 serve two purposes: connecting or supporting the components, and adjusting the spatial positions of the system's parts to accommodate different test products and the installation requirements of devices subjected to other environmental conditions such as heating, thus avoiding spatial interference.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-load-bearing, anti-overturning triaxial vibration testing device, characterized in that, The application relates to a three-axis vibration system and a bearing anti-overturning system, wherein the three-axis vibration system comprises three vibration tables which are vertically arranged in pairs, and the bearing anti-overturning system comprises a support arm group and an air spring which are connected with the three-axis vibration system; the bearing anti-overturning system further comprises an air spring mounting plate one, an air spring mounting plate two, a fixed support base, an air spring support frame and a limiting block; the support arm group is composed of four support arms; the upper and lower surfaces of the cantilever end of each support arm are respectively provided with a group of air springs through the air spring mounting plate one; the lower surface of the air spring below the support arm is connected with the fixed support base through the air spring mounting plate two; the upper surface of the air spring above the support arm is connected with the air spring support frame through the air spring mounting plate two; a pair of limiting blocks are fixed on the side wall of the air spring support frame, and the cantilever end of the support arm is located between the upper and lower inner surfaces of the limiting blocks.

2. The high-load anti-overturning triaxial vibration testing device according to claim 1, wherein The three-axis vibration system further comprises a test system table, a hydraulic ball head, a ball head mounting adapter plate and an adapter connecting rod; the test system table is arranged as the center, and three vibration tables are vertically arranged in pairs; the vibration table in the vertical direction is fixed on the foundation, and the two vibration tables in the horizontal direction are fixed on the vibration table fixed base which is fixed on the foundation; each two hydraulic ball heads are arranged as a group, and are connected with the three vibration tables through the ball head mounting adapter plate, and are respectively connected with the test system table through the adapter connecting rod.

3. The high-load anti-overturning triaxial vibration testing device according to claim 2, wherein The upper surface of the test system table is square, and the lower structure is an octagonal prism.

4. The high-load anti-overturning triaxial vibration testing device according to claim 3, wherein, The bottom surface of the test system table and two mutually perpendicular surfaces corresponding to two adjacent sides of the square upper surface are used to be connected with the adapter connecting rod, and four surfaces corresponding to the four corner positions of the square upper surface are connected with the bearing anti-overturning system.

5. The high-load anti-overturning triaxial vibration testing device according to claim 4, wherein The hydraulic ball head is a high-frequency hydraulic ball head.

6. The high-load anti-overturning triaxial vibration testing device according to claim 1, wherein The bearing anti-overturning system further comprises a pair of limiting blocks which are fixed on the side wall of the air spring support frame, and the cantilever end of the support arm is located between the upper and lower inner surfaces of the limiting blocks.

7. The high-load anti-overturning triaxial vibration testing device according to claim 1, wherein The vertical plate of the support arm is connected with the side surface and the bottom surface of the four corner positions of the test system table.

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