Vibration test clamp

Abstract

The utility model relates to the technical field of steering systems, in particular to a vibration test clamp. A vibration test clamp comprises a moving coil connecting plate, a clamp body and sample expansion plates, and is characterized in that the moving coil connecting plate is connected with the clamp body, the top surface, the left side surface and the right side surface of the clamp body are respectively connected with the sample expansion plates, and a plurality of acceleration sensors are arranged on the clamp body. Compared with the prior art, the vibration test clamp has the advantages that the main body part of the clamp is integrally designed, the expansibility is high, and the inherent frequency and the rigidity are good.

Description

Technical Field

[0001] The utility model relates to the technical field of steering systems, in particular to a vibration test fixture. Background Art

[0002] As one of the reliability tests, the mechanical vibration test simulates the vibration load of the component in actual use, with the purpose of verifying the resistance of the component to defect modes such as shedding and material fatigue. In the vibration test, the test sample needs to be fixed on the vibration table by the fixture. Therefore, the structural design, stiffness performance and sensor layout of the fixture of the vibration endurance test will directly affect the vibration test table excitation transmission.

[0003] After searching, the existing technology has the following shortcomings: 1. The vibration test fixture adopts a large number of split designs, and each part of the fixture body is fastened by bolts. The bolts need to be tightened consistently during each installation process, which is inconvenient for frequent installation and disassembly. In addition, due to the large load during the vibration test, the bolts in the stress concentration area are easy to loosen, which affects the test. 2. The vibration test fixture adopts a large number of beam structures and welding processes. This structure has a large deformation during the vibration process, and its performance will decay with the increase of use time, which is easy to affect the conduction of the bench excitation and the resonance frequency performance is poor. Summary of the invention

[0004] The utility model provides a vibration test fixture to overcome the deficiencies of the prior art. The main body of the fixture adopts an integrated design, has strong expandability, and has good natural frequency and stiffness performance.

[0005] To achieve the above-mentioned purpose, a vibration test fixture is designed, including a dynamic coil connecting plate, a fixture body, and a sample expansion plate. The characteristics are as follows: the dynamic coil connecting plate is connected to the fixture body, the top surface, left side surface and right side surface of the fixture body are respectively connected to the sample expansion plate, and a plurality of acceleration sensors are arranged on the fixture body.

[0006] The moving coil connecting plate is a disc-shaped structure, and a plurality of bolt holes connected with the clamp body are arranged on the moving coil connecting plate.

[0007] The fixture body is a cubic structure, the bottom of the fixture body is connected to the dynamic coil connecting plate by bolts, and the top, left side and right side of the dynamic coil connecting plate are provided with a plurality of bolt holes connected to the sample expansion plate.

[0008] The clamp body is made of aluminum alloy or carbon fiber.

[0009] The sample expansion board is a rectangular panel structure.

[0010] The size of the moving coil connecting plate is larger than that of the fixture body.

[0011] There are at least four acceleration sensors, the first acceleration sensor and the second acceleration sensor are respectively arranged at two diagonals on the top surface of the fixture body; the third acceleration sensor and the fourth acceleration sensor are respectively arranged at diagonals on the left and right sides of the fixture body close to the bottom surface.

[0012] Compared with the prior art, the utility model provides a vibration test fixture, the main body of the fixture adopts an integrated design, has strong expandability, and has good natural frequency and stiffness performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the dynamic coil connecting plate of the utility model.

[0014] Figure 2 It is a schematic diagram of the combination of the dynamic coil connecting plate and the clamp body of the utility model.

[0015] Figure 3 It is a schematic diagram of the combination of the dynamic coil connecting plate, the fixture body and the sample expansion plate of the utility model.

[0016] Figure 4 This is a schematic diagram of the layout of the acceleration sensor of the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described below with reference to the accompanying drawings.

[0018] like Figures 1 to 4 As shown, the dynamic coil connecting plate 1 is connected to the fixture body 2, the top surface, left side surface and right side surface of the fixture body 2 are respectively connected to the sample expansion plate 3, and a plurality of acceleration sensors 4 are arranged on the fixture body 2.

[0019] The moving coil connecting plate 1 is a disc-shaped structure, and is provided with a plurality of bolt holes connected with the clamp body 2 .

[0020] The fixture body 2 is a cubic structure. The bottom of the fixture body 2 is connected to the dynamic coil connecting plate 1 by bolts. The top, left side and right side of the dynamic coil connecting plate 1 are provided with a plurality of bolt holes connected to the sample expansion plate 3.

[0021] The fixture body 2 is made of aluminum alloy or carbon fiber.

[0022] The sample expansion board 3 is a rectangular panel structure.

[0023] The size of the moving coil connecting plate 1 is larger than that of the fixture body 2 .

[0024] There are at least four acceleration sensors 4, the first acceleration sensor 4.1 and the second acceleration sensor 4.2 are respectively arranged at two diagonals on the top surface of the clamp body 2; the third acceleration sensor 4.3 and the fourth acceleration sensor are respectively arranged at diagonals on the left and right sides of the clamp body 2 close to the bottom surface.

[0025] Since the stud arrangement form of the vibration table dynamic coil (not shown in the figure) is usually in a circular ring shape, in this embodiment, the shape of the dynamic coil connecting plate 1 is designed to be disc-shaped. In the assembly drawing, the dynamic coil connecting plate 1 is located between the fixture body 2 and the dynamic coil (not shown in the figure), and the dynamic coil connecting plate 1 is arranged with a number of bolt through holes, one part of which matches the studs of the vibration table dynamic coil, and the other part matches the threaded holes of the fixture body 2. The function of the dynamic coil connecting plate 1 is to connect the dynamic coil with the fixture body 2 and transmit the excitation of the dynamic coil to the fixture body 2.

[0026] The dynamic coil connecting plate 1 can also play a role of conversion, so that the size of the fixture body 2 is not limited by the size of the dynamic coil (not shown in the figure), and the overall fixture body 2 can be made lightweight and miniaturized, reducing the load on the platform and improving the overall natural frequency of the fixture body 2.

[0027] The fixture body 2 is designed in a cubic shape, and the top surface of the fixture body 2 is arranged with a number of bolt through holes, and the bottom surface is in contact with the dynamic coil connection plate 1 and fixed together through the bolt through holes. In addition, additional bolt holes are arranged on the top surface and the left and right sides of the fixture body 2 for fixing the sample expansion plate 3. The fixture body 2 can be made of aluminum alloy or carbon fiber materials, which can reduce weight and reduce the load of the vibration table while ensuring rigidity. Its function is to serve as the main part of the expansion table, receive the vibration excitation transmitted from the dynamic coil connection plate 1, and then transmit it to the sample expansion plate 3. If the size of the fixture body 3 is designed to be small, there is a risk of interference with the screw holes of the sample expansion plate 3 on the left and right sides and the front and rear sides, so the top surface, left side and right side of the fixture body 2 are usually used to fix the sample expansion plate 3. In this case, there is no need to change the type and direction of the table body, and there is no need to disassemble and assemble the test sample when changing direction. It only needs to replace the position of the sample expansion plate 3 to apply loads in the three directions of X / Y / Z to the three samples respectively.

[0028] The sample expansion plate 3 and the fixture body 2 are detachable and fastened by bolts. The sample expansion plate 3 can be customized according to different types of test samples. When switching between different types of samples, the fixture body 2 can be kept unchanged. Only the specific sample expansion plate 3 needs to be replaced to complete the bench change, which improves the adaptability of the fixture body 2 and saves the overall use cost of the fixture.

[0029] First, connect the dynamic coil and the dynamic coil connecting plate 1 by bolts, then connect the fixture body 2 and the dynamic coil connecting plate 1 by bolts, and then select the corresponding sample expansion plate 3 to be installed on the top surface and left and right sides of the fixture body 2 respectively, and finally install the test sample on the sample expansion plate 3.

[0030] According to CAE simulation analysis, the maximum deformation point of this vibration model is at the connection between the fixture body 2 and the dynamic coil connecting plate 1. Four acceleration sensors are used, two of which are respectively pasted on the two diagonal areas of the top surface of the fixture body 2, and two are respectively pasted on the diagonal areas of the left and right sides of the fixture body 2 close to the bottom surface. This arrangement can most realistically reflect the conduction of the fixture body 2 to the gantry excitation.

[0031] Start the vibration table, first connect the vibration table dynamic coil and the dynamic coil connecting plate 1 by bolts, then connect the fixture body 2 and the dynamic coil connecting plate 1 by bolts, and then select the corresponding sample expansion plate 3 to install on the top, left and right mounting surfaces of the fixture body 2 respectively, and finally install the test sample on the sample expansion plate 3.

[0032] According to CAE simulation analysis, the natural frequencies of the vibration fixture in the embodiment are 1353 Hz for the first order, 1415 Hz for the second order, and 2341 Hz for the third order. The maximum deformation occurs at the connection between the fixture body 2 and the dynamic connecting plate 1. Therefore, four acceleration sensors are required, two of which are respectively attached to the two diagonal corners of the top surface of the fixture body 2, and two are respectively attached to the diagonal areas of the left and right sides close to the bottom surface. This arrangement can most realistically reflect the conduction of the excitation of the fixture body by the test bench.

[0033] The first, second, third and fourth vibration waveforms are generated according to the first, second, third and fourth acceleration sensor signals, and the four acceleration sensor signals are processed by weighted average method for weighted average control of the gantry. According to the weight f1=f2=f3=f4=25%, the final control signal vibration waveform of the gantry is calculated by weighted average.

[0034] The fixture body of the utility model is an integrated design, with a small deformation during the vibration process, and better overall stiffness and natural frequency performance. It can realize vibration tests in the three directions of X, Y, and Z at the same time, improving the test efficiency.

Claims

1. A vibration test fixture, comprising a moving coil connection plate, a fixture body, and a sample expansion plate, characterized in that: The moving coil connecting plate (1) is connected to a fixture body (2), the top surface, left side surface and right side surface of the fixture body (2) are respectively connected to a sample expansion plate (3), and a plurality of acceleration sensors (4) are provided on the fixture body (2).

2. A vibration test fixture according to claim 1, characterized in that: The moving coil connecting plate (1) is a disc-shaped structure, and a plurality of bolt holes connected to the clamp body (2) are provided on the moving coil connecting plate (1).

3. A vibration test fixture according to claim 1, characterized in that: The clamp body (2) is a cubic structure. The bottom of the clamp body (2) is connected to the dynamic coil connecting plate (1) by bolts. The top, left side and right side of the dynamic coil connecting plate (1) are provided with a plurality of bolt holes connected to the sample expansion plate (3).

4. A vibration test fixture according to claim 1 or 3, characterized in that: The clamp body (2) is made of aluminum alloy or carbon fiber.

5. A vibration test fixture according to claim 1, characterized in that: The sample expansion board (3) is a rectangular panel structure.

6. A vibration test fixture according to claim 1, characterized in that: The size of the moving coil connecting plate (1) is larger than the size of the clamp body (2).

7. A vibration test fixture according to claim 1, characterized in that: At least four acceleration sensors (4) are provided, wherein a first acceleration sensor (4.1) and a second acceleration sensor (4.2) are respectively arranged at two diagonal positions on the top surface of the clamp body (2); and a third acceleration sensor (4.3) and a fourth acceleration sensor are respectively arranged at diagonal positions on the left side and right side of the clamp body (2) close to the bottom surface.

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