A universal elastic support platform

Abstract

The application provides a universal elastic support platform, and belongs to the technical field of measurement and testing, and comprises an elastic support system, a pressure reducing valve, a high-pressure gas source and pipelines, wherein the elastic support system comprises air springs, a connecting structure, connecting sliding blocks and a rigid support base; the rigid support base comprises columns and beams; the air springs are arranged in parallel and are fixed between the rigid support base and the connecting structure through adapter bases; the pressure reducing valve is arranged in series between the air springs and the high-pressure gas source and is used for independently adjusting and controlling the gas pressure entering each set of air springs; the connecting structure comprises an adapter frame and main beams and is used for connecting the air springs, test products and the rigid support base; the adapter frame is annular, the main beams are two, are arranged in the radial direction of the adapter frame and extend out of the adapter frame, and the main beams are provided with sliding grooves; and the connecting sliding blocks and the sliding grooves form sliding pairs. The application solves the problems of high support frequency, poor support stability and difficulty in simulating free boundaries of the existing elastic support platform.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of measurement test, and particularly relates to a universal elastic supporting platform, in particular to an elastic supporting platform for providing a free boundary for a test product in a reverberation chamber noise test. BACKGROUND

[0002] An aircraft will be subjected to severe engine jet noise and aerodynamic noise during launching and flight, causing vibration of the aircraft structure and instruments and equipment, and possibly causing damage. Noise test can obtain the vibration response of the structure, instruments and equipment and their connecting parts by applying noise load to the aircraft to simulate the noise environment in the flight state, and can check the adaptability of the aircraft to the noise environment.

[0003] In the noise test, the test product needs to be elastically supported to simulate the free-free boundary condition in the flight state, that is, the support frequency of the test product is less than 1 / 4 of the test starting frequency. The traditional rubber pad supporting mode is difficult to reduce the support frequency to below 10 Hz, and at the same time cannot guarantee the stability of the support of the test product.

[0004] The elastic supporting platform in the test needs to ensure the safety and stability of the test product and be in a free boundary state. Stability and freedom are inherently contradictory concepts. For most test products, only the rear end frame can be used as the docking surface of the supporting device, and at the same time the test product needs to be in a vertical state, which causes the center of gravity of the product to be higher than the support point, resulting in an unstable equilibrium state of the test product, which needs to be improved. SUMMARY

[0005] The present application provides a universal elastic supporting platform device, which aims to solve the problems of high support frequency, poor support stability and difficulty in simulating free boundary of the existing elastic supporting platform for large test products in noise test.

[0006] The utility model provides a kind of general elastic support platform, including elastic support system, pressure reducing valve, high-pressure gas source and pipeline, elastic support system includes air spring, connecting structure, connecting slider and rigid support base;Rigid support base is detachably fixed with the ground rail of reverberation chamber, adopts frame type structure, including column and crossbeam;Air spring is connected in parallel, is fixed between rigid support base and connecting structure respectively by adapter base;The telescopic direction of air spring is arranged along vertical direction;High-pressure gas source is used to provide continuous stable high-pressure gas for air spring;Pressure reducing valve is connected in series between air spring and high-pressure gas source, independently adjusts and controls the gas pressure into each set of air spring;High-pressure gas source, pressure reducing valve, air spring are connected respectively by pipeline;Connecting structure adopts frame type structure, including adapter frame and girder, for connecting air spring, test product and rigid support base, adapter frame is used with adapter end frame at the bottom of test product;Adapter frame is annular structure, and girder has two, it is arranged along the radial direction of adapter frame and extends to outside adapter frame;The part of girder extending to outside adapter frame is provided with the radial direction sliding groove, and connecting slider is arranged on the side of connecting structure close to test product, and forms sliding pair with sliding groove, for connecting test product and connecting structure.

[0007] As further optimization, the elastic support platform further includes a guide mechanism, the guide mechanism is arranged on the side of the connecting structure away from the test product, and includes an insert guide plate, a rubber pad and a rolling bearing, an integral guide groove is arranged on the outside of the adapter base and is used in conjunction with the insert guide plate;The insert guide plate is used to limit the large displacement in the horizontal direction;The rubber pad is used to provide elastic support in the horizontal direction;The rolling bearing is used to provide the vertical degree of freedom.

[0008] As further optimization, the air springs include five sets, four of which are fixed on the top of the columns of the rigid support base by the adapter bases, and the other one is fixed on the center of the top of the rigid support base by the adapter base.

[0009] As further optimization, the air springs are arranged directly below the connection between the adapter frame and the girder and directly below the intersection of the two girders.

[0010] As further optimization, the high-pressure gas source is an air compressor, and the pipeline is a hose.

[0011] As further optimization, the rigid support base is made of hard aluminum alloy material and is welded.

[0012] As further optimization, the connecting slider is made of hard aluminum alloy material.

[0013] As further optimization, the connecting structure is made of hard aluminum alloy material and is welded.

[0014] As further optimization, the girders of the connecting structure adopt a hollow structure.

[0015] As a further optimization, the insertion guide plate of the guide mechanism is made of hard aluminum alloy material.

[0016] The purpose of the present application is achieved by the following technical solutions:

[0017] The low-frequency elastic support requirement in noise test can be met, the reverberation chamber noise test and the traveling wave tube noise test of large test products can be applied, the support frequency of the test product can be effectively reduced, and the support stability of the test product can be improved. Only the adapter end frame is needed for connection with the test product, and the compatibility is good. The support of the test product is completely located at the bottom of the test product, and the interference on the reverberation sound field is avoided during the reverberation chamber noise test. In addition, the technical scheme can be applied to products of various sizes and weights, and can be adapted by adjusting the position of the connecting slider on the connecting structure as the product volume increases. For the test product with the center of gravity not at the geometric center, the pressure of the multiple air spring systems can be independently adjusted to make the test product in a horizontal state. Compared with the prior art, the support frequency is low, the simulation effect is good, the universal compatibility is good, the safety and stability and the free boundary characteristics are combined, the implementation cost is low, the problems existing in the prior art are solved, and outstanding substantial features and significant progress are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the overall structure schematic diagram of one of the specific embodiments of the present application;

[0019] Figure 2 is the elastic support system structure schematic diagram of one of the specific embodiments of the present application;

[0020] Figure 3 is Figure 2 is the structure schematic diagram in another perspective;

[0021] Figure 4 is the position relationship schematic diagram in the use state of one of the specific embodiments of the present application;

[0022] The drawings show that: 1, elastic support system; 2, pressure reducing valve; 3, air compressor; 4, air pipe; 11, connecting slider; 12, air spring; 13, guide mechanism; 14, connecting structure; 15, rigid support base. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] like Figures 1 to 3 As shown, a specific embodiment of a general-purpose elastic support platform is used to connect and support test products, so that the test products are isolated from ground vibration after floating, and have a free boundary condition to meet the requirements of simulating free boundaries in noise tests.

[0025] In this specific embodiment, the general-purpose elastic support platform includes an elastic support system 1, a pressure reducing valve 2, an air compressor 3, and an air pipe 4. The elastic support system 1 includes an air spring 12, a connecting structure 14, a guide mechanism 13, a connecting slider 11, and a rigid support base 15, and is the core component of the entire general-purpose elastic support platform.

[0026] The rigid support base 15 is used to connect the entire elastic support system 1 to the ground, serving as a fixed support. In this specific embodiment, the rigid support base 15 is detachably fixed to the ground rail of the reverberation chamber using bolts. In this specific embodiment, the rigid support base 15 adopts a frame structure welded from hard aluminum alloy, including columns, beams, and diagonal braces. There are four columns, symmetrically arranged. The material and structure of the rigid support base 15 can be adaptively adjusted according to actual needs to meet the strength and rigidity requirements.

[0027] In this specific embodiment, there are five sets of air springs 12, arranged in parallel. Four sets are fixed to the tops of the four columns of the rigid support base 15 via adapter bases, and the other set is fixed to the center of the top of the rigid support base 15 via an adapter base. The extension and contraction direction of the air springs 12, i.e., the axial direction, is set along the vertical direction to ensure that the direction of the elastic force is parallel to the direction of gravity, resulting in more uniform force distribution and easier adjustment. The air springs 12 are filled with compressed air in a flexible, sealed rubber air bladder, utilizing the elasticity of the compressed air to transmit force, thereby achieving vibration isolation and providing a support frequency of approximately 2Hz, which can ensure that the support frequency requirements of the test are met. The specific model, quantity, and position of the air springs 12 can be flexibly selected according to the size and weight of the test product. Adaptive modifications made by those skilled in the art based on common knowledge do not require creative effort.

[0028] Air compressor 3 provides compressed air to air spring 12. Pressure reducing valve 2 is connected in series between air spring 12 and air compressor 3 to regulate and control the air pressure entering air spring 12. Each air spring 12 is equipped with a set of pressure reducing valves 2, which are independently controlled. By adjusting the air pressure, the test product is kept horizontal, providing elastic support and isolating it from ground vibration after it floats, thus providing a free boundary condition. Air compressor 3, pressure reducing valve 2, and air spring 12 are connected by air pipes 4.

[0029] It should be noted that high pressure nitrogen or other gas can also be filled in the air spring 12, the air compressor 3 can also be replaced by a nitrogen cylinder or other high pressure gas source, and the air pipe 4 can also be replaced by a hard pipe, which does not affect the test effect and has no substantial difference from the scheme described in the embodiment.

[0030] The bottom of the air compressor 3 and the pressure reducing valve 2 in the embodiment is provided with a roller, which can move along the track of the reverberation chamber, so as to facilitate the adjustment of the use position.

[0031] The connecting structure 14 in the embodiment is a frame structure welded by hard aluminum alloy material, including an adapter frame, a main beam and a reinforcing rib, which is used to connect the air spring 12, the test product and the rigid support base 15. The adapter frame is a ring-shaped hollow structure, which is used in cooperation with the adapter end frame at the bottom of the test product. The specific structure and connection form can be adjusted according to the actual situation of the test product. In the embodiment, the main beam has two parts, which are arranged in the radial direction of the adapter frame and extend out of the adapter frame. The reinforcing rib connects the adapter frame and the main beam.

[0032] In the embodiment, the four sets of air springs 12 fixed on the top of the column of the rigid support base 15 are arranged immediately below the connection between the adapter frame and the main beam. The air spring 12 in the middle is arranged immediately below the intersection of the two main beams. The purpose is to shorten the force transmission path as much as possible. The gravity of the test product is transmitted to the ground through the connecting structure 14, the air spring 12, the column and the track in turn.

[0033] In the embodiment, the main beam and the reinforcing rib are both hollow structures. The purpose is to reduce the weight of the structure as much as possible under the premise of meeting the strength and rigidity requirements, thereby reducing the load of the air spring 12.

[0034] The part of the main beam extending out of the adapter frame is provided with a radial sliding groove. The connecting sliding block 11 is arranged on the side of the connecting structure 14 close to the test product, and forms a sliding pair with the sliding groove. The purpose is to adapt to test products of different diameters and meet the universality of the elastic support platform. In the embodiment, the connecting sliding block 11 is made of hard aluminum alloy material, which is used to connect the test product and the connecting structure 14. Since its position on the connecting structure 14 is adjustable, it can be applied to the installation of test products with a diameter of less than 3.75 meters. There are four sets of connecting sliding blocks 11, which are uniformly arranged in the circumferential direction. The corresponding central angles between adjacent connecting sliding blocks 11 are all 90°.

[0035] The guide mechanism 13 is arranged on the side of the connecting structure 14 away from the test product, and comprises an insertion guide plate, a rubber pad and a rolling bearing. The insertion guide plate is made of hard aluminum alloy material and is used to limit the large displacement in the horizontal direction. The rubber pad is used to provide elastic support in the horizontal direction. The rolling bearing is used to provide free movement in the vertical direction. An integral guide groove is arranged on the outside of the adapter base and is used in conjunction with the insertion guide plate to facilitate installation.

[0036] The general elastic support platform in the embodiment is used as follows:

[0037] As shown in Figure 4 , the general elastic support platform in the embodiment is used for noise test of a conical-cylindrical elastic body. The elastic support system 1 is fixed to the ground rail on the ground through the rigid support base 15, and four sets of connecting sliding blocks 11 are installed on the top of the elastic support system 1 by bolts. The test product, i.e., the adapter end frame at the bottom of the elastic body, is connected and fixed to the elastic support system 1 through the connecting sliding blocks 11. Five sets of air springs 12 are connected in parallel, and each set of air spring 12 is connected in series with a set of pressure reducing valve 2. The pressure of each air spring 12 is independently controlled, and the elastic body is kept in a horizontal position by adjusting the pressure of the air spring 12 at different positions. The air compressor 3 provides high-pressure air required by the air spring 12, and gradually increases the pressure of the air spring 12 through the pressure reducing valve 2 to stably float the test product, so that it is in a free state during noise test.

[0038] The beneficial technical effects achieved by the embodiment are:

[0039] The elastic support requirement of the test product in the noise test can be met, and the embodiment is suitable for anechoic chamber noise test and traveling wave tube noise test of large test products (such as rockets, missiles and satellites). The support frequency of the test product can be effectively reduced, and the support stability of the test product can be improved. The connection with the test product only needs to use the adapter end frame at the bottom of the test product, and does not need to be connected to a specific position, which has good compatibility. The support of the test product is completely located at the bottom of the test product, and does not interfere with the anechoic sound field during anechoic chamber noise test.

[0040] The embodiment is suitable for products of various sizes and weights, and can be adapted by adjusting the position of the connecting sliding block on the connecting structure as the volume of the product increases. For test products with the center of gravity not at the geometric center, the pressure of the multiple air spring systems can be independently adjusted to keep the test product in a horizontal state.

Claims

1. A general-purpose flexible support platform, characterized in that, It includes an elastic support system (1), a pressure reducing valve (2), a high-pressure air source and pipelines. The elastic support system (1) includes an air spring (12), a connecting structure (14), a connecting slider (11) and a rigid support base (15). The rigid support base (15) is detachably fixed to the ground rail of the reverberation chamber and adopts a frame structure, including columns and beams; the air springs (12) are arranged in parallel and are fixed between the rigid support base (15) and the connecting structure (14) respectively through the adapter base; the extension and contraction direction of the air springs (12) is arranged along the vertical direction. The high-pressure gas source is used to provide a continuous and stable high-pressure gas to the air spring (12); the pressure reducing valve (2) is connected in series between the air spring (12) and the high-pressure gas source to independently adjust and control the gas pressure entering each air spring (12); the high-pressure gas source, the pressure reducing valve (2) and the air spring (12) are connected by pipelines respectively. The connection structure (14) adopts a frame structure, including a transfer frame and a main beam, for connecting the air spring (12), the test product and the rigid support base (15). The transfer frame is used in conjunction with the transfer end frame at the bottom of the test product. The adapter frame is a ring structure with two main beams that are arranged in a cross pattern along the radial direction of the adapter frame and extend outside the adapter frame. The parts of the main beams that extend outside the adapter frame are provided with radial grooves. The connecting slider (11) is located on the side of the connecting structure (14) close to the test product and forms a sliding pair with the grooves to connect the test product and the connecting structure (14).

2. The elastic support platform according to claim 1, characterized in that, The elastic support platform also includes a guide mechanism (13), which is located on the side of the connecting structure (14) away from the test product. The guide mechanism (13) includes an insert guide plate, a rubber pad, and a rolling bearing. An integral guide groove is provided on the outer side of the adapter base, which is used in conjunction with the insert guide plate. The insert guide plate is used to limit large displacement in the horizontal direction. The rubber pad is used to provide elastic support in the horizontal direction. The rolling bearing is used to provide freedom in the vertical direction.

3. The elastic support platform according to claim 1, characterized in that, There are five sets of air springs (12), four of which are fixed to the top of the column of the rigid support base (15) by means of an adapter base, and the other set is fixed to the center of the top of the rigid support base (15) by means of an adapter base.

4. The elastic support platform according to claim 3, characterized in that, The air springs (12) are respectively located directly below the connection between the adapter frame and the main beam, and directly below the intersection of the two main beams.

5. The elastic support platform according to any one of claims 1 to 4, characterized in that, The high-pressure air source is an air compressor, and the pipeline uses a flexible hose.

6. The elastic support platform according to any one of claims 1 to 4, characterized in that, The rigid support base (15) is welded from hard aluminum alloy material.

7. The elastic support platform according to any one of claims 1 to 4, characterized in that, The connecting slider (11) is made of hard aluminum alloy.

8. The elastic support platform according to any one of claims 1 to 4, characterized in that, The connecting structure (14) is welded from hard aluminum alloy material.

9. The elastic support platform according to claim 8, characterized in that, The main beam of the connecting structure (14) adopts a hollow structure.

10. The elastic support platform according to claim 2, characterized in that, The insertable guide plate of the guide mechanism (13) is made of hard aluminum alloy.

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