One-way input and two-way output vibration clamp
By designing a vibration fixture with unidirectional input and bidirectional output, and using special geometry and materials, rapid switching and efficient transmission of vibration modes are achieved. This solves the problem that traditional vibration fixtures cannot meet the requirements of multi-directional vibration testing, and improves the comprehensiveness and accuracy of the test.
Patent Information
- Application Number
- CN202510342350.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2045-03-21
AI Technical Summary
Traditional vibration test fixtures can only transmit unidirectional vibrations, which cannot meet the needs of multidirectional vibration testing, resulting in insufficient comprehensiveness and accuracy of the test.
Design a vibration fixture with unidirectional input and bidirectional output. Through special geometry and material selection, the unidirectional vibration of the vibration table is converted into multidirectional vibration, including bidirectional vibration, torsional vibration and compression vibration modes. Low-density, low-elastic-modulus metal materials such as aluminum alloy are used. The standard connecting arm can be installed in different positions and directions to achieve mode switching.
It enables rapid switching of vibration modes, improves vibration transmission efficiency and first-order natural frequency, and can achieve bidirectional output in the low and mid-frequency range to meet the multi-directional vibration testing needs of different test pieces.
Smart Images
Figure CN120121398B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vibration testing fixture technology, and specifically to a vibration fixture with unidirectional input and bidirectional output. Background Technology
[0002] As is well known, vertical vibration tables are the most widely used in vibration testing. However, vibration testing requires simultaneous excitation in multiple directions, and traditional vibration fixtures can usually only transmit unidirectional vibration, which cannot meet the needs of multidirectional vibration testing. Therefore, in order to meet the bidirectional vibration testing requirements of different test pieces, it is necessary to design fixtures that can convert unidirectional vibration into bidirectional vibration to achieve bidirectional vibration testing of test pieces and improve the comprehensiveness and accuracy of the test. Summary of the Invention
[0003] To overcome the limitation of traditional vibration test fixtures that can only transmit unidirectional vibration, the present invention aims to propose a vibration fixture with unidirectional input and bidirectional output functions. Through a special geometric structure, the unidirectional vibration output from the vibration table is converted into multidirectional vibration to meet the bidirectional vibration testing requirements of different test pieces.
[0004] The objective of this invention is achieved through the following technical solution:
[0005] A vibration fixture with unidirectional input and bidirectional output includes an upper expansion disk 1, a lower expansion disk 3, and several standard connecting arms 2. The upper expansion disk 1 and the lower expansion disk 3 each have screw holes with different distribution positions. The standard connecting arms 2 are Z-shaped and have screw holes on their horizontal beams. The upper expansion disk 1 and the lower expansion disk 3 are connected to the vibration table surface, the standard connecting arms 2, and the test piece by bolts. The standard connecting arms 2 can be installed with the upper expansion disk 1 and the lower expansion disk 3 in different positions and directions to form different vibration modes, including bidirectional vibration mode, torsional vibration mode, and compression vibration mode.
[0006] The bidirectional vibration mode refers to converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and translation in the X or Y direction. In the bidirectional vibration mode, all standard connecting arms 2 are oriented in the same direction and are evenly installed around the lower expansion plate 3. When subjected to load vibration, all standard connecting arms 2 bend in the same direction, thereby converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and translation in the X or Y direction.
[0007] The torsional vibration mode refers to converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and rotation around the Z axis. In the torsional vibration mode, all standard connecting arms 2 are evenly installed around the lower expansion plate 3, and the orientation of all standard connecting arms 2 is consistent with the tangent of the circumference of the installation position of the standard connecting arms 2 on the lower expansion plate 3. When subjected to load vibration, the bending direction of all standard connecting arms 2 is parallel to the tangent of the circumference of the installation position on the lower expansion plate 3, thereby realizing the conversion of the vibration of the vibration table surface in the Z direction into translation in the Z direction and rotation around the Z axis.
[0008] The compression vibration mode refers to converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and circumferential compression deformation of the bottom of the upper expansion disk 1. In the compression vibration mode, all standard connecting arms 2 are evenly installed around the lower expansion disk 3. The orientation of all standard connecting arms 2 is perpendicular to the tangent of the circumference of the installation position of the standard connecting arms 2 on the lower expansion disk 3 and points to the center of the lower expansion disk 3. When subjected to load vibration, the bending direction of all standard connecting arms 2 is perpendicular to the tangent of the circumference of the installation position on the lower expansion disk 3 and points to the center of the lower expansion disk 3, thereby realizing the conversion of the vibration of the vibration table surface in the Z direction into translation in the Z direction and circumferential compression deformation of the bottom of the upper expansion disk 1.
[0009] The orientation of the standard connecting arm 2 refers to the projection of the line connecting the inclined beam from the lower end to the upper end onto the lower expansion plate 3.
[0010] The standard connecting arm 2 is made of a low-density, low-modulus metallic material, such as aluminum alloy, which is easy to process and install, while possessing high structural strength and load-bearing capacity.
[0011] The upper expansion disk 1 is connected to the test piece, and its circumferential screw holes are provided to match the installation mode of the test piece; the lower expansion disk 3 is a hollow structure, connected to the vibration table surface, and its disk surface size matches the vibration table surface size, and the disk surface of the lower expansion disk 3 is provided with screw holes that match the distribution position of the screw holes on the vibration table surface.
[0012] The inclined beam of the standard connecting arm 2 has an angle of 30-60° with the horizontal direction. Using this angle range, the vibration clamp has a large load-bearing capacity.
[0013] The first natural frequency of the vibration fixture is 628.08 Hz in bidirectional vibration mode, 705.09 Hz in torsional vibration mode, and 616.87 Hz in compression vibration mode. Resonance will not occur within their respective operating frequency bands, which are 0~600 Hz in bidirectional vibration mode, 0~700 Hz in torsional vibration mode, and 0~600 Hz in compression vibration mode.
[0014] The clamp has a maximum load of 10kN in bidirectional vibration mode, corresponding to a maximum load capacity of 1020kg; a maximum load of 15kN in torsional vibration mode, corresponding to a maximum load capacity of 1530kg; and a maximum load of 10kN in compression vibration mode, corresponding to a maximum load capacity of 1020kg.
[0015] Compared with the prior art, the present invention has the following advantages:
[0016] 1) The three vibration modes described in this invention can be quickly switched by changing the installation position of the standard connecting arm 2 between the upper expansion disk 1 and the lower expansion disk 3.
[0017] 2) The standard connecting arm 2 of the present invention adopts low-density and low-elastic modulus metal materials, such as aluminum alloy, according to the principle of lightweight structure, which is easy to process and install, while having high structural strength and load-bearing capacity.
[0018] 3) The vibration transmission efficiency of the unidirectional input bidirectional output vibration fixture described in this invention is high, and its first-order natural frequency is higher than 600Hz. It has a wide operating frequency band and can realize the unidirectional input bidirectional output conversion of low and mid-frequency vibration. Attached Figure Description
[0019] Figure 1 This is a perspective view of the bidirectional vibration mode combination model of the present invention.
[0020] Figure 2 This is a perspective view of the combined model of torsional vibration modes of the present invention.
[0021] Figure 3 This is a perspective view of the combined compression vibration mode model of the present invention.
[0022] Figure 4 This is a perspective view of the upper expansion disk model of the present invention.
[0023] Figure 5 This is a perspective view of the standard connecting arm model of the present invention.
[0024] Figure 6 This is a perspective view of the lower expansion disk model of the present invention.
[0025] In the diagram: 1. Upper expansion disk; 2. Standard connecting arm; 3. Lower expansion disk. Detailed Implementation
[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0027] The present invention relates to a unidirectional input, bidirectional output vibration clamp, comprising an upper expansion disk 1, a standard connecting arm 2, and a lower expansion disk 3, as described above. Figure 4 , Figure 5 and Figure 6 As shown.
[0028] like Figure 5 As shown, the standard connecting arm 2 is Z-shaped. In this embodiment, the angle between the inclined beam of the standard connecting arm 2 and the horizontal direction is 45°. It is installed between the upper expansion plate 1 and the lower expansion plate 3 through the screw holes on the horizontal beam. The preset screw holes on the upper expansion plate 1 and the lower expansion plate 3 provide a variety of installation modes.
[0029] As shown in the figure Figure 6 As shown, the lower expansion plate 3 has screw holes at different positions. It is connected to the vibration table surface through the large-diameter screw holes and connected to the standard connecting arm 2 through the small-diameter expansion holes, and supports connection methods in different directions.
[0030] like Figure 4 As shown, the upper expansion plate 1 has screw holes at different positions. The screw holes distributed in the middle circumferential direction are used to install the test piece, and the screw holes around the perimeter match the screw holes on the lower expansion plate 3, which can be connected to the standard connecting arm 2 in different directions.
[0031] like Figure 1 As shown, this is a combined bidirectional vibration mode model, in which all standard connecting arms 2 are oriented in the same direction and are evenly installed around the lower extension plate 3. When subjected to load vibration, all standard connecting arms 2 bend in the same direction, thereby converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and translation in the X or Y direction.
[0032] like Figure 2 As shown, this is a combined model of torsional vibration modes, in which all standard connecting arms 2 are evenly installed around the lower expansion disk 3. The orientation of all standard connecting arms 2 is consistent with the tangent of the circumference of the installation position of the standard connecting arms 2 on the lower expansion disk 3. When subjected to load vibration, the bending direction of all standard connecting arms 2 is parallel to the tangent of the circumference of the installation position on the lower expansion disk 3, thereby converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and rotation around the Z axis.
[0033] like Figure 3 As shown, this is a combined compression vibration mode model, in which all standard connecting arms 2 are evenly installed around the lower expansion disk 3. The orientation of all standard connecting arms 2 is perpendicular to the tangent of the circumference of the installation position of the standard connecting arms 2 on the lower expansion disk 3, and points towards the center of the lower expansion disk 3. When subjected to load vibration, the bending direction of all standard connecting arms 2 is perpendicular to the tangent of the circumference of the installation position on the lower expansion disk 3, and points towards the center of the lower expansion disk 3, thereby converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and circumferential compression deformation of the bottom of the upper expansion disk 1.
[0034] The three vibration modes described in this invention can be quickly switched by changing the installation position of the standard connecting arm 2 between the upper expansion plate 1 and the lower expansion plate 3.
[0035] In this example, the upper expansion disk 1 of the vibration fixture has a radius of 150 mm and a thickness of 10 mm, and has 48 M2 threaded through holes with a diameter of 2.2 mm. The material is structural steel.
[0036] In this example, the standard connecting arm 2 of the vibration clamp has an inclined beam with a length of 50 mm, a width of 30 mm, and a thickness of 10 mm; the horizontal beam has an upper bottom length of 12 mm, a lower bottom length of 20 mm, a thickness of 7 mm, and a width of 30 mm. The horizontal beam has four M2 threaded through holes with a diameter of 2.2 mm; the material is aluminum alloy.
[0037] In this example, the lower expansion plate 3 of the vibration clamp has an outer diameter of 120 mm, an inner diameter of 80 mm, and a thickness of 10 mm. It has four M10 threaded through holes with a diameter of 10.5 mm and forty M2 threaded through holes with a diameter of 2.2 mm. The material is structural steel.
[0038] The vibration fixture was modeled based on the aforementioned dimensions and materials. Simulation calculations yielded the following first-order natural frequency and maximum load of the fixture:
[0039] The first natural frequency of the vibration fixture is 628.08 Hz in bidirectional vibration mode, 705.09 Hz in torsional vibration mode, and 616.87 Hz in compression vibration mode. Resonance will not occur within their respective operating frequency bands, which are 0~600 Hz in bidirectional vibration mode, 0~700 Hz in torsional vibration mode, and 0~600 Hz in compression vibration mode.
[0040] The maximum load of the vibration clamp in bidirectional vibration mode is 10kN, corresponding to a maximum load capacity of 1020kg; the maximum load in torsional vibration mode is 15kN, corresponding to a maximum load capacity of 1530kg; and the maximum load in compression vibration mode is 10kN, corresponding to a maximum load capacity of 1020kg.
[0041] The material of the vibration fixture can be changed; a low-density, high-stiffness material can be selected to improve the first-order natural frequency and maximum load of the fixture. Its size can be scaled proportionally to adapt to different testing requirements.
[0042] The vibration clamp of this invention bears a dynamic load. Considering fatigue risk, a safety factor of 2.0 is used to calculate the maximum load, ensuring that the material stress is below the yield strength. The scope of protection of this invention is defined by the claims and is not limited to the specific embodiments described above. All implementations within the scope of the claims are bound by this invention.
Claims
1. A vibration clamp with unidirectional input and bidirectional output, characterized in that: It includes an upper expansion plate (1), a lower expansion plate (3) and several standard connecting arms (2). The upper expansion plate (1) and the lower expansion plate (3) have screw holes with different distribution positions. The standard connecting arms (2) are Z-shaped and have screw holes on the horizontal beam of the standard connecting arms (2). The upper expansion plate (1) and the lower expansion plate (3) are connected to the vibration table surface, the standard connecting arms (2) and the test piece by bolts. The standard connecting arms (2) can be installed with the upper expansion plate (1) and the lower expansion plate (3) in different positions and directions to form different vibration modes. The vibration modes include bidirectional vibration mode, torsional vibration mode and compression vibration mode. The bidirectional vibration mode refers to converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and translation in the X or Y direction; in the bidirectional vibration mode, all standard connecting arms (2) are oriented in the same direction and are evenly installed around the lower expansion plate (3). The torsional vibration mode refers to converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and rotation around the Z axis. In the torsional vibration mode, all standard connecting arms (2) are evenly installed around the lower expansion plate (3), and the orientation of all standard connecting arms (2) is consistent with the tangent of the circumference of the installation position of the standard connecting arms (2) on the lower expansion plate (3). The compression vibration mode refers to converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and circumferential compression deformation of the bottom of the upper expansion disk (1); in the compression vibration mode, all standard connecting arms (2) are evenly installed in the circumference of the lower expansion disk (3), and the orientation of all standard connecting arms (2) is perpendicular to the tangent of the circumference of the installation position of the standard connecting arms (2) on the lower expansion disk (3) and points to the center of the lower expansion disk (3); The orientation of the standard connecting arm (2) refers to the projection of the line connecting the inclined beam of the standard connecting arm from the lower end to the upper end onto the lower extension plate (3).
2. The vibration clamp with unidirectional input and bidirectional output according to claim 1, characterized in that: In the bidirectional vibration mode, when subjected to load vibration, the bending direction of all standard connecting arms (2) is consistent, thereby converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and translation in the X or Y direction. In the torsional vibration mode, when subjected to load vibration, the bending direction of all standard connecting arms (2) is parallel to the tangent of the circumference where the installation position is located on the lower expansion plate (3), thereby converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and rotation around the Z axis. In the compression vibration mode, when subjected to load vibration, the bending direction of all standard connecting arms (2) is perpendicular to the tangent of the circumference of the installation position on the lower expansion disk (3) and points to the center of the lower expansion disk (3), thereby converting the vibration of the vibration table surface in the Z direction into translation in the Z direction and circumferential compression deformation of the bottom of the upper expansion disk (1).
3. The vibration clamp with unidirectional input and bidirectional output according to claim 1, characterized in that: The standard connecting arm (2) is made of a low-density and low-elastic modulus metal.
4. A vibration clamp with unidirectional input and bidirectional output according to claim 1, characterized in that: The upper expansion disk (1) is connected to the test piece, and its circumferential screw holes are provided to match the installation mode of the test piece; the lower expansion disk (3) is a hollow structure, connected to the vibration table surface, and its disk surface size matches the vibration table surface size, and the disk surface of the lower expansion disk (3) is provided with screw holes that match the distribution position of the screw holes on the vibration table surface.
5. A vibration clamp with unidirectional input and bidirectional output according to claim 1, characterized in that: The angle between the inclined beam of the standard connecting arm (2) and the horizontal direction is 30-60°.
6. A vibration clamp with unidirectional input and bidirectional output according to claim 1, characterized in that: The first natural frequency of the vibration fixture is 628.08 Hz in bidirectional vibration mode, 705.09 Hz in torsional vibration mode, and 616.87 Hz in compression vibration mode. Resonance will not occur within their respective operating frequency bands, which are 0~600 Hz in bidirectional vibration mode, 0~700 Hz in torsional vibration mode, and 0~600 Hz in compression vibration mode.
Citation Information
Patent Citations
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