System and method for testing dynamic performance of bistable structure

Abstract

The invention discloses a dynamic performance testing system and method for a bistable structure, and belongs to the technical field of structure testing. The system comprises a workbench, a linear adjustment module, a clamping and angle adjustment module, a torque detection module, a stress detection module and a displacement detection module. The linear adjustment module is arranged on the workbench and is used for adjusting the boundary constraint of the tested structure; one end of the clamping and angle adjusting module is connected with the linear adjusting module, and the other end is fixed at the top of the torque detection module; the stress detection module is used for measuring steady state switching critical force, and the displacement detection module is used for detecting critical displacement. According to the invention, multi-parameter synchronous testing of the bistable structure under different boundary conditions is realized through modular design, dynamic response data of displacement, force and torque can be accurately obtained, and an effective testing means is provided for performance research of the bistable structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural performance testing, and particularly relates to a bistable structure dynamic performance testing system and testing method. BACKGROUND

[0002] Bistable structures have shown great application potential in many engineering and material science fields. Their unique bistable characteristics make them irreplaceable in applications such as actuators, robots, micro-electro-mechanical systems (MEMS), sensors, and energy harvesters. Although bistable structures have broad application prospects, the switching process of bistable structures involves strong nonlinearity, and traditional linear detection methods cannot accurately capture the transient characteristics. In addition, the state switching of bistable structures is usually completed in milliseconds or even microseconds, which brings many challenges to the testing and evaluation of their dynamic performance, including low testing accuracy, difficulty in capturing state switching, and single testing data. Therefore, it is of great significance to propose a bistable structure dynamic performance testing system and testing method for exploring the changes in the dynamic performance of bistable structures under different boundary conditions and different trigger conditions. SUMMARY

[0003] To solve the technical problems in the background art, the present application proposes a bistable structure dynamic performance testing system and testing method, which adopts the following technical solutions:

[0004] A bistable structure dynamic performance testing system and testing method, the device comprises a workbench, a linear adjustment module placed on the workbench, a clamping and angle adjustment module, a torque detection module, a stress detection module, and a displacement detection module. The clamping and angle adjustment module is connected to the linear adjustment module through a sliding table on one side and is fixed to the top of the torque detection module on the other side. The stress detection module is placed behind the clamping and angle adjustment module. The displacement detection module is installed on the workbench through a support frame.

[0005] The linear adjustment module comprises a drive motor, a bearing seat, a ball screw, a sliding rail base, a sliding rail, and a sliding table. The output shaft of the drive motor is connected to the ball screw through a coupling. The ball screw is rotatably supported by the bearing seat. The sliding table is installed on the sliding rail base and is connected to the ball screw through a built-in nut.

[0006] The clamping and angle adjustment module comprises a rotating platform and a clamp. Two clamps are respectively placed on the top of the two rotating platforms and are fixedly installed.

[0007] The stress detection module comprises a manual X-axis linear slide, a manual Y-axis linear slide, a pressure sensor support and a pressure sensor.

[0008] The displacement detection module comprises a support frame, slide rails, an optical displacement sensor support, an optical displacement sensor and a light supplement lamp, the support frame is composed of profiles and is fixed to the workbench, the first guide rail and the second guide rail are symmetrically installed on the left and right sides of the top of the support frame, the spanning profiles are connected to the first guide rail and the second guide rail at the left and right ends, the third guide rail is installed on the spanning profiles, the sensor support is connected to the third guide rail, and the optical displacement sensor and the light supplement lamp are both fixed to the optical displacement sensor support.

[0009] The single variable push-pull excitation method of the bistable structure dynamic performance test system and test method comprises the following steps:

[0010] Step one: confirm that the linear adjustment module and the clamping and angle adjustment module are free of jamming and have moderate tightness, and the pressure sensor and the optical displacement sensor can normally output test data.

[0011] Step two: fix the measured bistable test piece in the clamping and angle adjustment module, ensure that the initial position of the measured bistable test piece is the natural stable state, adjust the stress detection module, and make the pressure sensor located on the axis of the measured bistable test piece.

[0012] Step three: start the linear adjustment module to push the measured bistable test piece to move 5mm at a constant speed, adjust the stress detection module, move 0.2mm in the Y direction at an average time interval of 1s, and record the stress and the strain of the measured bistable test piece, and repeat the data recording more than three times.

[0013] Step four: draw the displacement-output force-time relationship curve, fit the two curves to obtain the final stress-strain curve, and finally restore the stress detection module and the linear adjustment module to the initial position.

[0014] Step five: according to the recorded data and the fitted stress-strain curve, extract the key mechanical parameters from the curve.

[0015] The single variable push-pull excitation method of the bistable structure dynamic performance test system and test method comprises the following steps:

[0016] Step one: confirm that the straight line adjustment module and the clamping and angle adjustment module have no jamming and the tightness is moderate, and whether the torque sensor and the optical displacement sensor can normally output test data.

[0017] Step two: fix the measured bistable test piece in the clamping and angle adjustment module, and ensure that the initial position of the measured bistable test piece is the natural stable state.

[0018] Step three: start the straight line adjustment module to push the measured bistable test piece to move 5mm at a constant speed, adjust the clamping and angle adjustment module, and when the angle is adjusted, rotate 0.2mm at an average time interval of 1s, and record the size of the torque and the strain of the measured bistable test piece, and repeat more than three times to record the data.

[0019] Step four: draw the displacement, torque and time relationship curve respectively, and fit the two to obtain the final torque strain curve, and finally restore the initial position of the clamping and angle adjustment module and the straight line adjustment module.

[0020] Step five: according to the recorded data fitting torque strain curve, the key mechanical parameters are extracted from the curve.

[0021] The beneficial effects of the present application are:

[0022] The present application provides a kind of bistable structure dynamic performance test system and method, the system includes adjustable fixture, loading platform and sensor integrated module, by constructing device structure and performance test system, can realize the accurate measurement and analysis of displacement, force and torque etc. Parameters of bistable mechanism under different loading conditions.The present application structure design is compact, and the function is strong, and operation is simple, effectively solve the problem that dynamic response of bistable structure under different boundary conditions is difficult to quantify in prior art, provide efficient, reliable solution for the performance test of bistable structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall structure schematic diagram of the bistable structure dynamic performance test system described in the present application.

[0024] Figure 2 It is the schematic diagram of the straight line adjustment module, clamping and angle adjustment module and torque detection module described in the present application.

[0025] Figure 3 It is the stress detection module structure schematic diagram described in the present application.

[0026] Figure 4 It is the structure schematic diagram of the position detection module described in the present application.

[0027] Figure 5 It is the schematic diagram of the measured bistable test piece described in the present application.

[0028] Figure 6 This is the single variable push-pull incentive flow chart of the present invention

[0029] Figure 7 This is the single variable torsional excitation flow chart of the present invention

[0030] The annotations in the above figure are as follows:

[0031] 1. Workbench; 2. Linear adjustment module; 21. Drive motor; 22. Bearing seat; 23. Ball screw; 24. Slide rail base; 25. Slide rail; 26. Slide table; 27. Coupling; 3. Clamping and angle adjustment module; 31. Rotating platform; 32. Fixture; 4. Torque detection module; 41. Torque sensor; 5. Stress detection module; 51. Manual X-axis linear slide; 52. Manual Y-axis linear slide; 53. Pressure sensor bracket; 54. Pressure sensor; 6. Displacement detection module; 61. Support frame; 62. First guide rail; 63. Second guide rail; 64. Third guide rail; 65. Optical displacement sensor; 66. Fill light; 67. Optical displacement sensor bracket; 68. Span profile; 7. Bistable specimen to be tested DETAILED DESCRIPTION

[0032] See also Figures 1 to 7 As shown:

[0033] A bistable structure dynamic performance testing system and testing method, the device includes a workbench 1, a workbench 1 placed on the workbench 1, a clamping and angle adjustment module 3, a torque detection module 4, a stress detection module 5, and a displacement detection module 6. The clamping and angle adjustment module 3 is connected to the workbench 1 through a slide 26 on one side and fixed to the top of the torque detection module 4 on the other side. The stress detection module 5 is placed on the rear side of the clamping and angle adjustment module 3. The displacement detection module 6 is installed on the workbench 1 through a support frame 61;

[0034] The workbench 1 achieves precise axial displacement of the specimen and adjusts boundary conditions. The module includes a drive motor 21, a bearing block 22, a ball screw 23, a base 24 of a slide rail 25, a slide rail 25, and a slide 26. The output shaft of the drive motor 21 is connected to the ball screw 23 via a coupling 27. The ball screw 23 is rotatably supported by the bearing block 22. The slide 26 is mounted on the base 24 of the slide rail 25 and has a built-in nut connected to the ball screw 23.

[0035] The clamping and angle adjustment module 3 provides multi-degree-of-freedom clamping, adapts to different specimen sizes, and realizes precise control of torsion conditions. The module includes a rotating platform 31 and a clamp 32. Two pairs of clamps 32 are respectively fixed on the top of the two rotating platforms 31.

[0036] The stress detection module 5 acquires the stress-time curve, and the module comprises a manual X-axis linear slide 5126, a manual Y-axis linear slide 52, a pressure sensor support 53, and a pressure sensor 54. The manual X-axis linear slide 51 is fixed to the rear side of the workbench 1, the manual Y-axis linear slide 52 is fixed to the top of the manual X-axis linear slide 51, the pressure sensor support 53 is fixed to the top of the manual Y-axis linear slide 52, and the pressure sensor 54 is clamped and fixed on the pressure sensor support 53.

[0037] The displacement detection module 6 synchronously records displacement-time data, and the module comprises a support frame 61, guide rails, an optical displacement sensor support 67, an optical displacement sensor 65, and a light supplement lamp 66. The support frame 61 is composed of profiles and is symmetrical left and right and fixed to the workbench 1. First guide rails 62 and second guide rails 63 are symmetrically installed on the left and right sides of the top of the support frame 61. A spanning profile 68 is connected to the first guide rails 62 and the second guide rails 63 at the left and right ends. A third guide rail 64 is installed on the spanning profile 68. The optical displacement sensor support 67 is connected to the third guide rail 64. The optical displacement sensor 65 and the light supplement lamp 66 are both fixed to the optical displacement sensor support 67.

[0038] The application provides a bistable structure dynamic performance test system and a test method.

[0039] Step one: Confirm that the linear adjustment module 2 and the clamping and angle adjustment module 3 are free of jamming and have moderate tightness, and check whether the pressure sensor 54 and the optical displacement sensor 65 can normally output test data.

[0040] Step two: Fix the measured bistable test piece 7 in the clamping and angle adjustment module 3, ensure that the initial position of the measured bistable test piece 7 is the natural stable state, and adjust the stress detection module 5 so that the pressure sensor 54 is located on the axis of the measured bistable test piece 7.

[0041] Step three: Start the driving motor 21 to push the measured bistable test piece 7 to move 5 mm at a constant speed, adjust the stress detection module 5, move 0.2 mm at an average time interval of 1 s in the Y direction, and record the stress and the strain of the measured bistable test piece 7, and repeat the data recording more than three times.

[0042] Step four: Draw the displacement-stress-time curve and the stress-strain curve, fit the two curves to obtain the final stress-strain curve, and finally restore the stress detection module 5 and the linear adjustment module 2 to the initial position.

[0043] Step five: According to the recorded data and the fitted stress-strain curve, key mechanical parameters can be extracted from the curve.

[0044] The application provides a bistable structure dynamic performance test system and a test method.

[0045] Step one: confirm that the linear adjustment module 2 and the clamping and angle adjustment module 3 are not stuck and have moderate tightness, and check whether the torque sensor 41 and the optical displacement sensor 65 can normally output test data.

[0046] Step two: fix the measured bistable test piece 7 in the clamping and angle adjustment module 3, and ensure that the initial position of the measured bistable test piece 7 is a natural stable state.

[0047] Step three: start the driving motor 21 to push the measured bistable test piece 7 to move 5 mm at a constant speed, adjust the clamping and angle adjustment module 3, and rotate 0.2 mm at an average time interval of 1 s when adjusting the angle, and record the size of the torque and the strain of the measured bistable test piece 7, and repeat the above data recording more than three times,

[0048] Step four: draw the displacement-torque-time relationship curve and the torque-strain curve, and fit the two curves to obtain the final torque-strain curve, and finally restore the initial position of the clamping and angle adjustment module 3 and the linear adjustment module 2.

[0049] Step five: according to the recorded data and the fitted torque-strain curve, the key mechanical parameters can be extracted from the curve.

[0050] The driving motor 21, the torque sensor 41 and the pressure sensor 54 are all assembled from existing devices, so the specific type and specification are not described.

Claims

1. A bistable structure dynamic performance testing system, comprising a workbench, a linear adjustment module placed on the workbench, a clamping and angle adjustment module, a torque detection module, a stress detection module, and a displacement detection module. One side of the clamping and angle adjustment module is connected to the linear adjustment module via a slide, and the other side is fixed to the top of the torque detection module. The stress detection module is placed at the rear of the clamping and angle adjustment module, and the displacement detection module is mounted on the workbench via a support frame.

2. A bistable structure dynamic performance testing system according to claim 1, characterized in that: The linear adjustment module includes a drive motor, a bearing seat, a ball screw, a slide rail base, a slide rail and a slide table; the output shaft of the drive motor is connected to the ball screw through a coupling, the ball screw is rotatably supported by the bearing seat, and the slide table is installed on the slide rail base and the built-in nut is connected to the ball screw.

3. A bistable structure dynamic performance testing system according to claim 1, characterized in that: The clamping and angle adjustment module includes a rotating platform and a clamp, and two pairs of clamps are respectively fixed on the top of the two rotating platforms.

4. A bistable structure dynamic performance testing system according to claim 1, characterized in that: The stress detection module includes a manual X-axis linear slide, a manual Y-axis linear slide, a pressure sensor bracket and a pressure sensor; the manual X-axis linear slide is fixed to the rear side of the linear adjustment module, the manual Y-axis linear slide is fixed to the top of the manual X-axis linear slide by bolts, the pressure sensor bracket is fixed to the top of the manual Y-axis linear slide, and the pressure sensor is clamped and fixed to the pressure sensor bracket.

5. The bistable structure dynamic performance testing system according to claim 1, characterized in that: The displacement detection module includes a support frame, a slide rail, a sensor bracket, an optical displacement sensor and a fill light. The support frame is composed of profiles, is symmetrical on the left and right and is fixed to the workbench. The first guide rail and the second guide rail are symmetrically installed on the left and right sides of the top of the support frame. The left and right ends of the spanning profile are connected to the first guide rail and the second guide rail. The third guide rail is installed on the spanning profile. The sensor bracket is connected to the third guide rail. The optical displacement sensor and the fill light are both fixed to the optical displacement sensor bracket.

6. A method for testing the dynamic performance of a bistable structure, characterized by: It includes single variable push-pull excitation test method and single variable torsion excitation test method, as follows: The steps of the single variable push-pull incentive testing method are as follows: Step 1: Confirm that the linear adjustment module and the clamping and angle adjustment module are not stuck and are properly tight, and that the pressure sensor and optical displacement sensor can output test data normally; Step 2: Fix the bistable specimen to be tested in the clamping and angle adjustment module to ensure that the initial position of the bistable specimen to be tested is in a natural stable state, and adjust the stress detection module so that the pressure sensor is located on the axis of the bistable specimen to be tested; Step 3: Start the linear adjustment module to move the bistable specimen under test by 5 mm at a constant speed. Adjust the stress detection module to move 0.2 mm in the Y direction at an average time interval of 1 second. Record the stress and strain of the bistable specimen under test. Repeat this process for more than three times. Step 4: Draw the relationship curves of displacement, output force and time respectively, and fit the two to obtain the final stress-strain curve. Finally, restore the stress detection module and the linear adjustment module to their initial positions; Step 5: Fit the stress-strain curve based on the recorded data and extract the key mechanical parameters from the curve; The steps of the single variable torsional excitation test method are as follows: Step 1: Confirm that the linear adjustment module and the clamping and angle adjustment module are not stuck and are properly tight, and that the torque sensor and optical displacement sensor can output test data normally; Step 2: Fix the bistable specimen to be tested in the clamping and angle adjustment module to ensure that the initial position of the bistable specimen to be tested is in a natural stable state; Step 3: Start the linear adjustment module to push the bistable specimen under test 5 mm at a constant speed. Adjust the clamping and angle adjustment modules. During the angle adjustment, rotate it 0.2 mm at an average time interval of 1 second. Record the torque and strain of the bistable specimen under test. Repeat this process for more than three times to record the data. Step 4: Draw the relationship curves of displacement, torque and time respectively, and fit the two to obtain the final torque-strain curve. Finally, restore the clamping and angle adjustment module and the linear adjustment module to their initial positions; Step 5: Fit the torque-strain curve based on the recorded data and extract the key mechanical parameters from the curve.

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