Electrostatically-driven elastic modulus testing device

Abstract

The utility model relates to an elastic modulus testing device driven by static electricity. The elastic modulus testing device comprises a testing device base, an excitation power supply and a vibration meter. The testing device base comprises a base, a displacement fine adjustment measuring platform, an upper clamping plate and an L-shaped plate; one end of the test sample serving as the resonant beam is fixed through the upper clamping plate and the L-shaped plate to form a cantilever beam structure; the displacement fine adjustment measuring platform is used for adjusting the relative position between the upper clamping plate and the base so as to adjust the displacement of the resonant beam and the base; the L-shaped plate is used for positioning and mounting the resonant beam and guiding the upper clamping plate in the moving process; the electrostatic excitation power supply is used for providing electrostatic excitation force for the resonant beam and is connected with the fixed end of the test sample serving as the resonant beam; the vibration meter is used for measuring the resonant frequency of the resonant beam. The testing device provided by the utility model has the characteristics of small size, light weight, quick response and simplicity and convenience in operation. Powerful support is provided for material performance research and engineering application.

Description

Technical Field

[0001] The utility model relates to the technical field of material mechanical property testing, in particular to an electrostatically driven elastic modulus testing device for accurately and efficiently measuring the elastic modulus of an elastic part. Background Art

[0002] In materials science research and engineering applications, elastic modulus is a key indicator for evaluating a material's mechanical properties. However, conventional elastic modulus test devices often suffer from bulkiness, complex structures, and slow response times. This not only limits their application in certain environments but also increases measurement cost and complexity. Therefore, a compact, lightweight, and fast-response elastic modulus test method and device are urgently needed. Utility Model Content

[0003] The purpose of this utility model is to provide an electrostatically driven elastic modulus test device to address the problems of large size, complex structure, and slow response in existing devices. The device is compact and lightweight, has a fast response, and is easy to operate. This provides strong support for material performance research and engineering applications.

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] The utility model provides an electrostatically driven elastic modulus testing device, comprising:

[0006] A test device base, comprising a base, a displacement fine-tuning measurement platform, an upper clamping plate, and an L-shaped plate; one end of the test sample, serving as a resonant beam, is secured by the upper clamping plate and the L-shaped plate to form a cantilever beam structure; the displacement fine-tuning measurement platform is used to adjust the relative position between the upper clamping plate and the base to adjust the displacement of the resonant beam and the base; the L-shaped plate is used to position and install the resonant beam and to guide the upper clamping plate during movement;

[0007] An electrostatic excitation power supply for providing electrostatic excitation force to the resonant beam is connected to the fixed end of the test sample serving as the resonant beam, and a vibrometer is used to measure the resonant frequency of the resonant beam.

[0008] The utility model discloses an electrostatically driven elastic modulus testing device, wherein the electrostatic excitation power supply is composed of a DC voltage and an AC voltage. By adjusting the coupling of the DC voltage and the AC voltage, the resonant beam is made to vibrate around the equilibrium position under the action of the AC component, and resonates when the excitation frequency is equal to the natural frequency of the resonant beam, thereby accurately measuring the resonant frequency.

[0009] The utility model discloses an electrostatically driven elastic modulus testing device, wherein the displacement fine-tuning measuring platform comprises an upper slide and a lower slide, the upper slide is fixed to an upper clamping plate, and the lower slide is fixed to a base, and precise adjustment of the displacement between the resonant beam and the base is achieved by adjusting the relative positions of the upper slide and the lower slide.

[0010] The utility model provides an electrostatically driven elastic modulus testing device, the elastic modulus of the resonant beam is:

[0011]

[0012] Where E is the elastic modulus, is the first-order circular frequency of the resonant beam, I is the section moment of inertia, ρ is the density of the resonant beam, A is the cross-sectional area of the resonant beam, and L is the length of the resonant beam.

[0013] The utility model provides a test mechanical structure of an electrostatically driven elastic modulus test device, wherein the mechanical structure comprises a resonant beam and a test device base, wherein one end of the resonant beam is fixed to the test device base via an upper clamping plate and an L-shaped plate to form a cantilever beam structure, and a displacement fine-tuning measurement platform is used to accurately adjust the relative position of the resonant beam and the base; wherein the resonant beam is a test sample; and the test device base comprises a base, a displacement fine-tuning measurement platform, an upper clamping plate and an L-shaped plate.

[0014] Compared with the prior art, the electrostatically driven elastic modulus testing device of the present invention has at least the following beneficial effects:

[0015] 1. Small and lightweight: The test device of the present invention has a compact structure, is easy to carry and install, and is suitable for a variety of test environments.

[0016] 2. Rapid response: The electrostatic drive method can quickly excite the vibration of the resonant beam and improve the test response speed.

[0017] 3. Easy to operate: The test method is simple and does not require complicated pre-processing steps, which reduces the test difficulty and cost.

[0018] The following is a further description of the electrostatically driven elastic modulus testing device of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the circuit structure and mechanical structure of an electrostatically driven elastic modulus testing device of the present invention;

[0020] Figure 2 The figure is a schematic diagram of the mechanical structure of a specific embodiment of an electrostatically driven elastic modulus testing device of the present invention.

[0021] Among them: 1...resonant beam

[0022] 2...Test device base

[0023] 21...base

[0024] 22...Displacement fine-tuning measurement platform

[0025] 23... Put on the splint

[0026] 24...L-shaped board. DETAILED DESCRIPTION

[0027] like Figure 1 and Figure 2 As shown, the utility model is an electrostatically driven elastic modulus testing device, which is mainly composed of a mechanical structure part and a circuit structure part.

[0028] The circuit structure includes an electrostatic excitation power supply (VDC and VAC) and a vibration meter. The electrostatic excitation power supply is used to provide electrostatic excitation force, while the vibration meter is used to measure the resonant frequency.

[0029] The mechanical structure includes a resonant beam 1 (test sample) and a test device base 2. The test device base 2 includes a base 21, a displacement fine-tuning measurement platform 22, an upper clamping plate 23 and an L-shaped plate 24.

[0030] The specific structure of each part:

[0031] 1. Resonant beam 1 (test sample):

[0032] As the object to be tested, its material, size and shape can be determined according to specific test requirements.

[0033] 2. Base 21:

[0034] It provides a stable basic support for the entire test device to ensure stability during the test.

[0035] 3. Displacement fine-tuning measurement platform 22:

[0036] It consists of an upper slide and a lower slide. The position of the upper clamping plate 23 relative to the base 21 can be changed through precise adjustment, thereby accurately controlling the displacement of the resonant beam 1 and the base, which helps to achieve high-precision measurement.

[0037] 4. Upper splint 23:

[0038] Cooperating with the L-shaped plate 24, it is used to fix one end of the resonant beam 1 to ensure that its position is fixed during the test process.

[0039] 5. L-shaped plate 24: On the one hand, it is used to position and install the resonance beam 1 to ensure the accuracy of its installation position; on the other hand, it plays a guiding role in adjusting the movement of the upper clamping plate to prevent movement deviation.

[0040] 6. Electrostatic excitation power supply (VDC and VAC):

[0041] An electrostatic excitation force is provided, including two voltage components, direct current (VDC) and alternating current (VAC), to achieve excitation and control of the resonant beam 1 .

[0042] 7. Vibration meter:

[0043] Used to accurately measure the vibration frequency of the resonant beam and provide key data for calculating the elastic modulus.

[0044] The working principle of the utility model when applied to measurement:

[0045] 1. The measurement principle is based on a parallel plate electrostatic excitation structure. A voltage consisting of a DC voltage and an AC voltage coupling is applied between the two plates.

[0046] 2. The electrostatic force exerted by the DC voltage component deflects the movable plate to a new equilibrium position; and the AC voltage component superimposed on the DC component causes the movable plate to vibrate around the equilibrium position.

[0047] 3. When the excitation frequency of the AC component in the excitation voltage is equal to the natural frequency of the movable plate (ie, the resonant beam), the movable plate resonates.

[0048] Operation steps when applying the utility model

[0049] 1. Prepare test samples

[0050] The elastic member to be tested is made into a resonant beam shape with constant thickness and known length, width and thickness.

[0051] 2. Install the test sample

[0052] One end of the resonant beam is firmly fixed by using the upper clamping plate 23 and the L-shaped plate 24 to form a cantilever beam structure.

[0053] 3. Adjust the displacement fine-tuning measurement platform

[0054] The displacement fine-tuning measuring platform is operated to move the upper slide and the upper clamping plate together, thereby changing the position of the upper clamping plate relative to the base and accurately determining the displacement of the resonant beam and the base.

[0055] 4. Connect the circuit

[0056] Correctly connect the electrostatic excitation power supply (VDC and VAC) to the test equipment to ensure that the power output is stable and meets the test requirements.

[0057] Likewise, a vibration meter is connected to the test device to obtain accurate vibration frequency data.

[0058] 5. Apply excitation voltage

[0059] Start the electrostatic excitation power supply and apply an excitation voltage consisting of a coupled DC and AC voltage to the test device.

[0060] 6. Measurement and data collection

[0061] The vibrometer measures the vibration frequency of the resonant beam in real time and transmits the data to the data processing system.

[0062] 7. Calculate the elastic modulus

[0063] Based on the collected data, the elastic modulus of the elastic part is calculated using a pre-set calculation formula and algorithm.

[0064] During the test, the resonant beam is excited to vibrate by an electrostatic excitation power supply, and the first-order natural frequency of the resonant beam is measured. The elastic modulus of the resonant beam (test sample) can be calculated using the following formula.

[0065]

[0066] Where, is the first-order circular frequency of the resonant beam, E is the elastic modulus, I is the section moment of inertia, ρ is the density of the resonant beam, A is the cross-sectional area of the resonant beam, and L is the length of the resonant beam.

[0067] The embodiments described above are merely descriptions of preferred implementations of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. An electrostatically driven elastic modulus testing device, characterized in that: include: A test device base, comprising a base, a displacement fine-tuning measurement platform, an upper clamping plate, and an L-shaped plate; One end of the test sample, serving as a resonant beam, is fixed by an upper clamping plate and an L-shaped plate to form a cantilever beam structure. The displacement fine-tuning measurement platform is used to adjust the relative position between the upper clamping plate and the base to adjust the displacement of the resonant beam and the base. The L-shaped plate is used to position and install the resonant beam and guide the upper clamping plate during movement. An electrostatic excitation power supply for providing an electrostatic excitation force to the resonant beam, connected to a fixed end of a test sample serving as the resonant beam; and a vibrometer for measuring the resonant frequency of the resonant beam.

2. The electrostatically driven elastic modulus testing device according to claim 1, characterized in that: The electrostatic excitation power supply provides an excitation force for the resonant beam through electrostatic excitation. The electrostatic excitation power supply is composed of a DC voltage and an AC voltage. By adjusting the coupling of the DC voltage and the AC voltage, the resonant beam vibrates around the equilibrium position under the action of the AC component and resonates when the excitation frequency is equal to the natural frequency of the resonant beam, thereby accurately measuring the resonant frequency.

3. The electrostatically driven elastic modulus testing device according to claim 1, characterized in that: The displacement fine-tuning measurement platform includes an upper slide and a lower slide. The upper slide is fixed to the upper clamping plate, and the lower slide is fixed to the base. By adjusting the relative positions of the upper slide and the lower slide, the displacement between the resonant beam and the base can be accurately adjusted.

4. The electrostatically driven elastic modulus testing device according to claim 1, characterized in that: The elastic modulus of the resonant beam is: Where E is the elastic modulus, is the first-order circular frequency of the resonant beam, I is the section moment of inertia, ρ is the density of the resonant beam, A is the cross-sectional area of the resonant beam, and L is the length of the resonant beam.

5. An electrostatically driven elastic modulus testing device, characterized in that: The test device comprises a mechanical structure, wherein the mechanical structure comprises a resonant beam and a test device base. One end of the resonant beam is fixed to the test device base via an upper clamping plate and an L-shaped plate to form a cantilever beam structure. The displacement fine-tuning measurement platform is used to accurately adjust the relative position of the resonant beam and the base. The resonant beam is a test sample. The test device base comprises a base, a displacement fine-tuning measurement platform, an upper clamping plate and an L-shaped plate.

6. The electrostatically driven elastic modulus testing device according to claim 5, characterized in that: The displacement fine-tuning measurement platform includes an upper slide and a lower slide. The upper slide is fixed to the upper clamping plate, and the lower slide is fixed to the base. By adjusting the relative positions of the upper slide and the lower slide, the displacement between the resonant beam and the base can be accurately adjusted.

7. The electrostatically driven elastic modulus testing device according to claim 5, characterized in that: The elastic modulus of the resonant beam is: Where E is the elastic modulus, is the first-order circular frequency of the resonant beam, I is the section moment of inertia, ρ is the density of the resonant beam, A is the cross-sectional area of the resonant beam, and L is the length of the resonant beam.

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