Parallel excitation vibration test device

Abstract

The utility model belongs to the technical field of vibration test, and discloses a parallel excitation vibration test device, which comprises a plurality of vibration tables, a test tool, an external guide assembly and a connecting piece, and is characterized in that the plurality of vibration tables are arranged at intervals along the linear direction; the test tool is used for mounting a test piece; one end of each connecting piece is in transmission connection with the output end of the corresponding vibration table, and the other end of each connecting piece is in rigid connection with the test tool; the external guide assembly is arranged in the circumferential direction of the test tool in a surrounding mode, one end of the external guide assembly is fixedly connected to the foundation, and the other end of the external guide assembly is fixedly connected to the test tool so that transverse shaking of the test tool can be reduced. The test tool is in rigid transmission connection with the vibration table through the connecting piece, the external guide assembly provides guidance for vibration of the test tool, transverse shaking of the test tool can be reduced, the ability of the test tool to move in the vertical direction is improved, and therefore a plurality of vibration tables can be connected, the number of control points is increased, and the vibration magnitude and the frequency range are improved. And various test requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration testing, in particular to a parallel excitation vibration testing device. Background Art

[0002] Aerospace products are subject to harsh vibration environments throughout their lifecycles, particularly during launch and flight, primarily caused by engines and aerodynamic turbulence, necessitating assessment of their adaptability to these environments. In recent years, aviation systems have often required vibration testing of very long, high-aspect-ratio, and lightweight specimens. Current shunt vibration testers on the market generally require a decoupling device to connect the specimen to the vibration table. They can connect up to two vibrators, setting two control points, and typically have a minimum frequency of 15-20Hz, with relatively small displacements. Furthermore, as the specimen's size and mass increase, the vibration magnitude and frequency range that the shunt vibration tester can provide gradually decreases, making it difficult to meet the testing requirements.

[0003] Therefore, it is urgent to propose a parallel excitation vibration test device to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a parallel excitation vibration test device, which can be connected to multiple vibration tables, increase the number of control points, improve the vibration level and frequency range, and meet various test requirements.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A parallel excitation vibration test device is used to perform a vibration test on a test piece, wherein the parallel excitation vibration test device comprises:

[0007] A plurality of vibration tables, wherein the plurality of vibration tables are arranged at intervals along a straight line direction;

[0008] A test fixture, on which the test piece can be fixedly mounted;

[0009] A connecting piece corresponding to each of the vibration tables, one end of the connecting piece being transmission-connected to the output end of the corresponding vibration table, and the other end being rigidly connected to the test fixture;

[0010] An external guide assembly is arranged around the circumference of the test fixture, and one end of the external guide assembly is fixedly connected to the foundation, and the other end is fixedly connected to the test fixture.

[0011] Furthermore, the external guide assembly includes a plurality of side guide support seats, and the test fixture is provided with side guide support seats on both sides along the length direction.

[0012] Furthermore, the external guide assembly further includes an end guide support seat, and the test fixture is respectively provided with one end guide support seat at both ends along the length direction.

[0013] Furthermore, the end guide support seat is adapted to the shape of the end of the test tool and can be wrapped around the end of the test tool.

[0014] Furthermore, the connecting member includes a connected supporting portion and a connecting portion, the supporting portion is used to be connected to the output end of the vibration table, the connecting portion is used to be connected to the test fixture, and the edge of the connecting portion protrudes from the edge of the supporting portion.

[0015] Furthermore, the connecting member also includes a plurality of reinforcing parts, which are arranged at intervals along the circumference of the support part, and one side of the reinforcing part is connected to the part of the connecting part protruding from the support part, and the width of the reinforcing part gradually decreases from top to bottom.

[0016] Furthermore, the parallel-excited vibration test device also includes a guide bearing, and each vibration table is provided with at least one guide bearing. The guide bearing includes a bearing seat and a guide shaft that slide together in the vertical direction. The bearing seat is arranged on the vibration table, and one end of the guide shaft is fixedly connected to the connecting member.

[0017] Furthermore, the parallel excitation vibration test device also includes a balancing airbag, and each vibration table is provided with at least three balancing airbags. The at least three balancing airbags are evenly spaced around the output end of the vibration table, and one end of the balancing airbag is connected to the connecting piece.

[0018] Furthermore, the test fixture includes a mounting layer, the mounting layer includes a frame and a mounting portion, the mounting portion is arranged in the frame, and the mounting portion is adapted to the shape of the lower end surface of the test piece.

[0019] Furthermore, the test fixture also includes a support layer, which includes a first frame and a second frame. The first frame and the second frame are connected by a connecting frame, and a reinforcement is connected between the first frame, the connecting frame and the second frame.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a parallel-excitation vibration test device for performing a vibration test on a test piece, wherein the parallel-excitation vibration test device comprises a plurality of vibration tables, a test fixture, an external guide assembly and a connecting piece, wherein the plurality of vibration tables are arranged at intervals along a straight line direction; the test piece can be fixedly mounted on the test fixture; the connecting piece corresponds to the vibration table one by one, one end of the connecting piece is transmission-connected to the output end of the corresponding vibration table, and the other end is rigidly connected to the test fixture; the external guide assembly is arranged around the circumference of the test fixture, and one end of the external guide assembly is fixedly connected to the foundation, and the other end is fixedly connected to the test fixture, so as to reduce the lateral shaking of the test fixture. The test fixture is used to install and fix the test piece. It can be used to install test pieces with very long length and large aspect ratio. The test fixture is rigidly connected to the output end of the corresponding vibration table through multiple connecting parts to excite the test piece. The external guide component is arranged around the circumference of the test fixture to provide guidance for the vibration of the test fixture, which can reduce the lateral shaking of the test fixture, improve the ability of the test fixture to move in the vertical direction, and ensure the stable operation of the parallel excitation vibration test device. Therefore, multiple vibration tables can be connected to increase the number of control points, improve the vibration magnitude and frequency range, and realize synchronous parallel excitation vibration of multiple units, which can meet various test needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the parallel excitation vibration test device of the present utility model;

[0023] Figure 2 This is a partial structural diagram of the parallel excitation vibration test device of the present utility model;

[0024] Figure 3 It is a structural schematic diagram of the test tooling of the present utility model.

[0025] In the picture:

[0026] 100. Test piece;

[0027] 1. Vibration table;

[0028] 2. Test fixture; 21. Installation layer; 211. Frame; 212. Installation portion; 22. Support layer; 221. First frame; 222. Second frame; 223. Connecting frame; 23. Reinforcement member;

[0029] 3. Connecting piece; 31. Supporting part; 32. Connecting part; 33. Reinforcement part;

[0030] 4. External guide assembly; 41. Side guide support seat; 42. End guide support seat;

[0031] 5. Guide bearing; 51. Bearing seat; 52. Guide shaft;

[0032] 6. Balance airbag. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] like Figures 1 to 3As shown, this embodiment provides a parallel-excited vibration test device for performing a vibration test on a specimen 100, wherein the parallel-excited vibration test device includes a plurality of vibration tables 1, a test fixture 2, an external guide assembly 4 and a connector 3, wherein the plurality of vibration tables 1 are arranged at intervals along a straight line direction; the specimen 100 can be fixedly mounted on the test fixture 2; the connector 3 corresponds one-to-one to the vibration table 1, one end of the connector 3 is transmission-connected to the output end of the corresponding vibration table 1, and the other end is rigidly connected to the test fixture 2; the external guide assembly 4 is arranged around the circumference of the test fixture 2, and one end of the external guide assembly 4 is fixedly connected to the foundation, and the other end is fixedly connected to the test fixture 2, so as to reduce the lateral shaking of the test fixture 2. The test fixture 2 is used to install and fix the test piece 100. It can be used to install a test piece 100 with a very long length and a large aspect ratio. The test fixture 2 is rigidly connected to the output end of the corresponding vibration table 1 through multiple connecting parts 3, so as to excite the test piece 100; the external guide component 4 is arranged around the circumference of the test fixture 2 to provide guidance for the vibration of the test fixture 2, which can reduce the lateral shaking of the test fixture 2, improve the ability of the test fixture 2 to move in the vertical direction, and ensure the stable operation of the parallel excitation vibration test device, so that multiple vibration tables 1 can be connected to increase the number of control points, improve the vibration magnitude and frequency range, and realize synchronous parallel excitation vibration of multiple units, which can meet various test requirements.

[0038] According to the test requirements, the staff can adaptively change the position and number of vibration tables 1 to adjust the position and number of control points. The models and output parameters of multiple vibration tables 1 can be the same or different. For example, the number of vibration tables 1 can be three, five, ten, or twelve, etc., which is not limited here.

[0039] After experimental verification, the parallel-excited vibration test device of this embodiment can be combined with up to 12 vibration tables 1 for joint testing, the minimum output frequency can reach 5 Hz, and the controlled displacement is increased by 10 times compared with the existing technology, which is sufficient to meet the test requirements.

[0040] Specifically, the external guide assembly 4 includes multiple side guide supports 41, each provided on either side of the test fixture 2 along its length. These supports 41 can clamp and secure the test fixture 2 along its width, reducing any wiggle along its width. Furthermore, the multiple side guide supports 41 are symmetrically positioned on either side of the test fixture 2 along its length, providing more balanced guidance for the test fixture 2.

[0041] Similarly, the external guide assembly 4 also includes an end guide support seat 42. An end guide support seat 42 is provided at each end of the test tooling 2 along its length direction, which can clamp and fix the test tooling 2 along its length direction to reduce the shaking of the test tooling 2 along its length direction.

[0042] Furthermore, the end guide support seat 42 is adapted to the end shape of the test fixture 2 and can be wrapped around the end of the test fixture 2, so that the connection between the end guide support seat 42 and the test fixture 2 is more stable, further improving the stability of vibration.

[0043] By clamping and fixing the test fixture 2 together by the side guide support seat 41 and the end guide support seat 42, the shaking of the test fixture 2 in the horizontal direction can be minimized, the ability of the test fixture 2 to move in the vertical direction can be improved, the stable operation of the parallel excitation vibration test device can be ensured, and the vibration level and frequency range can be improved.

[0044] like Figure 2 As shown, the connecting member 3 includes a connected supporting portion 31 and a connecting portion 32, wherein the supporting portion 31 is used to connect to the output end of the vibration table 1, and the connecting portion 32 is used to connect to the test fixture 2, and the edge of the connecting portion 32 protrudes from the edge of the supporting portion 31, thereby increasing the contact area between the connecting member 3 and the test fixture 2, making the rigid connection between the test piece and the test fixture 2 more stable.

[0045] Furthermore, the connector 3 also includes a plurality of reinforcement portions 33, which are arranged at intervals along the circumference of the support portion 31, and one side of the reinforcement portion 33 is connected to the portion of the connector 32 that protrudes from the support portion 31, so that the reinforcement portion 33 forms a three-point support structure, thereby making the overall structure of the connector 3 more stable, which is conducive to improving the deformation resistance of the connector 3 and ensuring the rigid connection between the test piece and the test fixture 2; the width of the reinforcement portion 33 gradually decreases from top to bottom, which can effectively alleviate the stress concentration caused by vibration, thereby reducing the adverse effects of local stress concentration on the durability of the device. The shape of the reinforcement member 23 can be, but is not limited to, a triangle or a right-angled trapezoid, etc., and is not specifically limited here.

[0046] Optionally, the parallel-excited vibration test device also includes a guide bearing 5. Each vibration table 1 is provided with at least one guide bearing 5. The guide bearing 5 includes a bearing seat 51 and a guide shaft 52 that slide together in the vertical direction. The bearing seat 51 is arranged on the vibration table 1, and one end of the guide shaft 52 is fixedly connected to the connecting part 32. Through the sliding fit between the bearing seat 51 and the guide shaft 52, an internal guiding function can be provided for the connecting part 3, further reducing the shaking of the test fixture 2 in the horizontal direction, improving the ability of the test fixture 2 to move in the vertical direction, and ensuring the stable operation of the parallel-excited vibration test device.

[0047] Furthermore, each vibration table 1 is provided with at least three guide bearings 5, which are evenly spaced around the output end of the vibration table 1. This ensures balanced force on the connection portion 32 and further ensures stable operation of the parallel excitation vibration test device. For example, in this embodiment, four guide bearings 5 ​​are evenly spaced around the output end of each vibration table 1. In other embodiments, the number of guide bearings 5 ​​can also be three, six, or nine, etc., without limitation herein.

[0048] In addition, the parallel excitation vibration test device also includes a balancing airbag 6. Each vibration table 1 is provided with at least three balancing airbags 6. The at least three balancing airbags 6 are evenly spaced around the output end of the vibration table 1, and one end of the balancing airbag 6 is connected to the connecting portion 32. By arranging evenly spaced balancing airbags 6 between the vibration table 1 and the connector 3, the forces on the connector 3 and the vibration table 1 can be balanced, which is beneficial to improving the bearing capacity of the connector 3 and the vibration table 1. For example, in this embodiment, four balancing airbags 6 are evenly spaced around the output end of each vibration table 1. In other embodiments, the number of balancing airbags 6 can also be three, six, or nine, etc., which is not limited here.

[0049] like Figure 3 As shown, the test fixture 2 includes a mounting layer 21, which includes a frame 211 and a mounting portion 212. The mounting portion 212 is disposed within the frame 211 and conforms to the shape of the lower end face of the specimen 100 to facilitate mounting and securing the specimen 100 and ensure the stability of the connection between the specimen 100 and the test fixture 2. The mounting portion 212 conforms to the shape of the lower end face of the specimen 100, which can reduce the weight of the test fixture 2. The frame 211 and the mounting portion 212 are both welded from aluminum plates and profiles. While ensuring structural strength, this can reduce the weight of the test fixture 2, thereby reducing the load on the vibration table 1 and improving the test results.

[0050] In addition, the end guide support seat 42 and the side guide support seat 41 are both fixedly connected to the mounting layer 21 . By guiding the mounting layer 21 , the vibration effect of the specimen 100 can be better ensured.

[0051] Furthermore, the test fixture 2 also includes a support layer 22, which includes a first frame 221 and a second frame 222. The first frame 221 and the second frame 222 are connected by a connecting frame 223. A reinforcement member 23 is connected between the first frame 221, the connecting frame 223, and the second frame 222. This can improve the structural strength and load capacity of the support layer 22 and ensure the rigid connection strength between the connector 3 and the test fixture 2. Similarly, the width of the reinforcement portion 33 gradually decreases from top to bottom, and the shape of the reinforcement member 23 can be, but is not limited to, a triangle or a right-angled trapezoid, etc., which will not be described in detail here.

[0052] Optionally, the mounting layer 21 and the supporting layer 22 are connected by fasteners, which can facilitate the assembly of the parallel excitation vibration test device and ensure the structural rigidity of the test fixture 2. The fasteners include but are not limited to bolts or screws, etc., which are not limited here.

[0053] In addition, the parallel excitation vibration test apparatus also includes a control system that is communicatively connected to the multiple vibration tables 1 and is used to control the output parameters of the vibration tables 1 and collect test data from the test piece 100 for analysis by personnel. The control system can be, but is not limited to, an existing PLC control system, a microcomputer control system, or an MCU control module, and is not limited here.

[0054] The following combination Figures 1 to 3 The specific process of installing and testing the parallel excitation vibration test device is briefly described, including the following steps:

[0055] First, finite element simulation technology is used to simulate and analyze the dynamic characteristics of the combination of test fixture 2 and the test product, and modal tests and frequency response function tests are performed on the specimen 100, test fixture 2, and their combination to select the appropriate excitation point location and excitation magnitude, control point location, and control method.

[0056] Secondly, based on the data obtained from the above test, multiple vibration tables 1 are fixed on the foundation at intervals along a straight line, and the side guide support bases 41 and end guide support bases 42 are pre-installed according to the size of the test fixture 2;

[0057] Next, install the connector 3 on the output end of the vibration table 1 and level it, and install the guide bearing 5 and the balancing airbag 6 between the vibration table 1 and the connector 32;

[0058] Afterwards, the support layer 22 is fixedly connected to the connecting portion 32;

[0059] Then, the mounting layer 21 is connected to the supporting layer 22, and the side guide support seats 41 are connected to both sides of the mounting layer 21 along its length direction, and the end guide support seats 42 are connected to both ends along its length direction;

[0060] Finally, the test piece 100 is mounted on the mounting portion 212 , and the control system starts the vibration table 1 to begin the test.

[0061] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A parallel excitation vibration test device for performing a vibration test on a test piece (100), characterized in that: The parallel excitation vibration test device comprises: A plurality of vibration tables (1), wherein the plurality of vibration tables (1) are arranged at intervals along a straight line direction; A test fixture (2), on which the test piece (100) can be fixedly mounted; a connecting member (3) corresponding one-to-one to the vibration table (1), one end of the connecting member (3) being transmission-connected to the output end of the corresponding vibration table (1), and the other end being rigidly connected to the test fixture (2); An external guide assembly (4) is arranged around the circumference of the test fixture (2), and one end of the external guide assembly (4) is fixedly connected to the foundation, and the other end is fixedly connected to the test fixture (2).

2. The parallel excitation vibration test device according to claim 1, characterized in that: The external guide assembly (4) comprises a plurality of side guide support seats (41), and the test fixture (2) is provided with side guide support seats (41) on both sides along the length direction.

3. The parallel excitation vibration test device according to claim 1, characterized in that: The external guide assembly (4) further comprises an end guide support seat (42), and the end guide support seat (42) is respectively provided at both ends of the test fixture (2) along the length direction.

4. The parallel excitation vibration test device according to claim 3, characterized in that: The end guide support seat (42) is adapted to the shape of the end of the test fixture (2) and can be wrapped around the end of the test fixture (2).

5. The parallel excitation vibration test device according to claim 1, characterized in that: The connecting member (3) comprises a connected supporting portion (31) and a connecting portion (32), wherein the supporting portion (31) is used to be connected to the output end of the vibration table (1), and the connecting portion (32) is used to be connected to the test fixture (2), and the edge of the connecting portion (32) protrudes from the edge of the supporting portion (31).

6. The parallel excitation vibration test device according to claim 5, characterized in that: The connecting member (3) further comprises a plurality of reinforcing portions (33), wherein the plurality of reinforcing portions (33) are arranged at intervals along the circumference of the supporting portion (31), and one side of the reinforcing portion (33) is connected to a portion of the connecting portion (32) protruding from the supporting portion (31), and the width of the reinforcing portion (33) gradually decreases from top to bottom.

7. The parallel excitation vibration test device according to any one of claims 1 to 6, characterized in that: The parallel-excited vibration test device also includes a guide bearing (5), and each of the vibration tables (1) is provided with at least one guide bearing (5). The guide bearing (5) includes a bearing seat (51) and a guide shaft (52) that are slidably fitted in a vertical direction. The bearing seat (51) is provided on the vibration table (1), and one end of the guide shaft (52) is fixedly connected to the connecting member (3).

8. The parallel excitation vibration test device according to any one of claims 1 to 6, characterized in that: The parallel excitation vibration test device further includes a balancing airbag (6), each of the vibration tables (1) is provided with at least three balancing airbags (6), the at least three balancing airbags (6) are evenly spaced around the output end of the vibration table (1), and one end of the balancing airbag (6) is connected to the connecting member (3).

9. The parallel excitation vibration test device according to any one of claims 1 to 6, characterized in that: The test fixture (2) comprises a mounting layer (21), the mounting layer (21) comprises a frame (211) and a mounting portion (212), the mounting portion (212) is arranged in the frame (211), and the mounting portion (212) is adapted to the shape of the lower end surface of the test piece (100).

10. The parallel excitation vibration test device according to claim 9, characterized in that: The test fixture (2) further includes a support layer (22), wherein the support layer (22) includes a first frame (221) and a second frame (222), wherein the first frame (221) and the second frame (222) are connected via a connecting frame (223), and a reinforcing member (23) is connected between the first frame (221), the connecting frame (223), and the second frame (222).

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