A multi-dimensional mixed experimental loading platform for vibration isolation device experiment

Abstract

This invention discloses a multidimensional hybrid experimental loading platform for vibration isolation device experiments, comprising a frame, a drive assembly, and a controller. The drive assembly includes a driver and a bracket with force application directions spatially orthogonal to each other. A driver positioned along a first direction drives the corresponding bracket to slide along the frame; a driver positioned along a second direction drives the corresponding bracket to slide along the bracket driven by the driver positioned in the first direction; and a driver positioned along a third direction drives the corresponding bracket to slide along the frame. The workpiece to be tested is clamped between the brackets driven by the drivers positioned in the second and third directions. The drivers positioned in the first and second directions work together to subject the workpiece to shear loads, while the driver positioned in the third direction subjects the workpiece to compressive loads. This multidimensional hybrid experimental loading platform for vibration isolation device experiments has the beneficial effect of simulating various vibration isolation stress conditions.

Description

Technical Field

[0001] This invention relates to the field of mechanical performance testing technology, and specifically to a multi-dimensional hybrid experimental loading platform for vibration isolation device experiments. Background Technology

[0002] In the field of mechanical performance testing of vibration isolation devices, commonly used experimental equipment is mainly divided into two categories: slow shear test devices and multidimensional vibration test platforms. Traditional test devices can mostly only achieve loading in one or two directions, making it difficult to apply composite loads to vibration isolation devices simultaneously in three mutually orthogonal directions in space, and thus failing to truly reproduce the working conditions under the combined action of compression and shear during actual use.

[0003] Slow shear test apparatuses can usually only perform shear loading in a single direction or vertical compression loading, and cannot apply shear load and compression load simultaneously. The mechanical parameters obtained from the test have a large deviation from the actual working conditions. Moreover, the clamping and testing process is cumbersome, the data from multiple tests are inconsistent, and it is difficult to reflect the true mechanical response under load coupling.

[0004] While multidimensional vibration platforms can achieve dynamic excitation in multiple directions, they are more suitable for high-frequency vibration testing. They lack control precision in low-speed, large-displacement quasi-static shear loading. The motion in the three directions is prone to mutual coupling interference, making it impossible to achieve independent and precise load control. The equipment has a complex structure and high cost, making it less suitable for routine testing of small and medium-sized vibration isolation devices. Summary of the Invention

[0005] To overcome the above-mentioned shortcomings in the prior art, the present invention provides a multi-dimensional hybrid experimental loading platform for simulating various vibration isolation stress conditions for vibration isolation device experiments.

[0006] The technical solution of this invention is as follows: A multidimensional hybrid experimental loading platform for vibration isolation device experiments includes a frame, a drive assembly, and a controller; The drive assembly includes a driver whose force application direction is spatially orthogonal to each other and a bracket that moves under the drive of each of the drivers; Among them, the driver arranged along the first direction drives the corresponding bracket to slide along the frame, the driver arranged along the second direction drives the corresponding bracket to slide along the bracket driven by the driver arranged in the first direction, and the driver arranged along the third direction drives the corresponding bracket to slide along the frame. The workpiece to be tested is clamped between a bracket driven by a driver set in a second direction and a third direction; The controller is electrically connected to each of the drivers and is used to issue action commands to each of the drivers; The actuators in the first and second directions work together to form a composite motion, causing the workpiece under test to be subjected to shear loads, while the actuators in the third direction cause the workpiece under test to be subjected to compressive loads.

[0007] Preferably, a guide mechanism is provided between each bracket and the corresponding sliding engagement component.

[0008] In any of the above solutions, the preferred embodiment is that the guiding mechanism consists of a groove and a slider that cooperate with each other.

[0009] In any of the above solutions, it is preferred that the bracket used to hold the workpiece to be tested is provided with a clamping and positioning mechanism; The clamping and positioning mechanism includes multiple clamping blocks evenly distributed around a preset center. Each of the aforementioned card blocks is constructed as follows: Radial locking occurs when the workpiece to be tested is placed in and subjected to a loading force.

[0010] In any of the above solutions, it is preferred that each of the clamping and positioning mechanisms slides radially along the preset center, and the body of each clamping block and its own sliding trajectory float up and down through an elastic element. In a natural state, the body of each clamping block floats down and locks with the bracket it is on.

[0011] In any of the above solutions, it is preferred that the body of the card block is provided with engagement teeth and the card block is provided with locking teeth; The elastic element drives the locking block toward the direction of the locking teeth.

[0012] In any of the above solutions, it is preferred that the line connecting the two opposing clamping blocks of each clamping and positioning mechanism passes through a preset center and achieves synchronous radial movement through a transmission mechanism.

[0013] In any of the above solutions, it is preferred that the transmission mechanism is implemented by any one of the following methods: a gear and rack mechanism, a linkage mechanism, or a lead screw mechanism.

[0014] In any of the above embodiments, it is preferred that a pressure sensor is provided between the driver and the driven bracket, and a displacement sensor is provided between each bracket and the frame.

[0015] The multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention drives the corresponding brackets to move through actuators with two spatially orthogonal directions of force application. The actuators in two directions can cooperate to form a composite motion, thereby applying shear loads to the workpiece under test. The actuator in the other direction can operate independently, directly applying compressive loads to the workpiece under test. By integrating shear loading and compressive loading into the same frame structure, and making the drives in each direction independent yet cooperatively controllable, it is possible to simultaneously achieve the combined application of shear and compressive loads. Therefore, it can realistically reproduce the various complex stress states that vibration isolation devices experience in actual use, realizing the simulation of various vibration isolation stress conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention.

[0017] Figure 2 This is a schematic diagram of a preferred embodiment of the multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention, which includes a driver arranged along a first direction and a second direction, a bracket corresponding to the driver arranged along the first direction and the second direction, and a frame cooperating with it.

[0018] Figure 3 This is a schematic diagram of a preferred embodiment of the multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention, which includes a driver arranged along a third direction, a bracket corresponding to the driver arranged along a third direction, and a frame in cooperation with it.

[0019] Figure 4 This is a schematic diagram of an embodiment of the guide mechanism of the multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention, which is arranged between the bracket and the frame, and between the brackets.

[0020] Figure 5 This is a schematic diagram of an embodiment of the clamping and positioning mechanism and bracket of the multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention.

[0021] Figure 6 This is a schematic diagram of an embodiment of the clamping mechanism of the multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention, in which any of the clamping blocks, elastic elements, and locking teeth are engaged.

[0022] Figure 7 This is a schematic diagram of an embodiment of the transmission mechanism of the multidimensional hybrid experimental loading platform for vibration isolation device experiments of the present invention and the cooperation of two opposing blocks along a preset center.

[0023] Explanation of the labels in the diagram: 101-Driver; 102-Frame; 103-Bracket; 104-Workpiece to be tested; 105-Guide rod; 106-Clamping block; 107-Locking tooth; 108-Sliding rail; 109-Spring; 110-Connecting rod. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Example 1: This multidimensional hybrid experimental platform for vibration isolation device experiments is mainly used to test the mechanical performance of building seismic isolation bearings.

[0027] Seismic isolation bearings typically consist of upper and lower connecting plates and a rubber body located between the connecting plates. Reinforcing structures such as lead cores may be installed within the rubber body. Under experimental conditions, the seismic isolation bearings need to withstand both vertical compressive loads and horizontal shear loads simultaneously; this platform is used to achieve this combined loading.

[0028] like Figure 1 , 2 As shown in Figures 3 and 4, the loading platform in this embodiment includes a rack 102, a drive component, and a controller.

[0029] The frame 102 serves as the basic support component of the entire platform, providing an installation foundation for various functional components. The frame 102 can be assembled from H-beams, channel steel, and other profiles through welding or bolting, possessing sufficient structural rigidity and load-bearing capacity to withstand the reaction forces generated during the experiment without significant deformation.

[0030] The drive assembly includes a plurality of actuators 101 whose force application directions are spatially orthogonal to each other, and a bracket 103 that moves under the drive of each actuator 101.

[0031] For ease of description, a spatial rectangular coordinate system is established, with the first direction as the X-axis, the second direction as the Y-axis, and the third direction as the Z-axis; wherein the X-axis and Y-axis together form a horizontal plane, and the Z-axis is the vertical direction.

[0032] The driver 101, which is set along the X-axis, drives the corresponding bracket 103 to slide along the frame 102 in the X-axis direction.

[0033] The driver 101, which is set along the Y-axis, drives the corresponding bracket 103 to slide in the Y-axis direction. The bracket 103 driven by the driver 101, which is set along the X-axis, slides in the Y-axis direction.

[0034] The driver 101, which is set along the Z-axis, drives the corresponding bracket 103 to slide along the frame 102 in the Z-axis direction.

[0035] The seismic isolation bearing to be tested is clamped and fixed between the bracket 103 driven by the driver 101 set in the Y-axis direction and the bracket 103 driven by the driver 101 set in the Z-axis direction.

[0036] Each bracket 103 is equipped with a guide mechanism between itself and the corresponding slidingly fitted component. The guide mechanism is used to ensure that the bracket 103 moves smoothly in a predetermined direction, improves the motion accuracy and load-bearing capacity, and can prevent the bracket 103 from swaying or jamming, especially under heavy load test conditions.

[0037] The guiding mechanism can employ a groove and slider structure that cooperates with each other. Alternatively, rolling elements such as balls or rollers can be placed between the groove and the slider to form a rolling guiding structure, thereby reducing sliding friction resistance and improving motion response accuracy.

[0038] The controller is electrically connected to each driver 101 and is used to send action commands to each driver 101 to control the output force, displacement, movement speed and movement sequence of the driver 101.

[0039] Each driver 101 is equipped with a pressure sensor between itself and the driven bracket 103, and each bracket 103 is equipped with a displacement sensor between itself and the frame 102. Both the pressure sensor and the displacement sensor are electrically connected to the controller.

[0040] During the experiment, each pressure sensor detects the magnitude of the loading force applied by each actuator 101 to the corresponding bracket 103 in real time and feeds the pressure signal back to the controller. The controller performs closed-loop control on each actuator 101 based on the preset experimental load and the real-time feedback pressure, ensuring that the compressive and shear loads applied to the seismic isolation support under test are accurately controllable and improving the experimental loading accuracy.

[0041] During the experiment, each displacement sensor detects the displacement of the corresponding bracket 103 relative to the frame 102 in real time and feeds the displacement signal back to the controller. The compression deformation and shear deformation of the workpiece 104 under test can be obtained in real time through the displacement signal, providing experimental basis for experimental data acquisition, load displacement curve plotting and mechanical performance analysis of seismic isolation bearings.

[0042] The specific experimental procedure is as follows: 1. Install the seismic isolation bearing to be tested between the Y-axis bracket 103 and the Z-axis bracket 103; 2. The driver 101, which is set in the Z-axis direction, is activated, pushing the bracket 103 to move in the vertical direction, and applying a vertical compressive load to the seismic isolation support under test; 3. The X-axis drive 101 and the Y-axis drive 101 work together to form a combined motion in the horizontal plane, causing the Y-axis bracket 103 to move horizontally relative to the Z-axis bracket 103, thereby applying a horizontal shear load to the seismic isolation support under test. 4. Through the program settings of the controller, the compression load and shear load can be applied separately, synchronously, or cyclically according to a preset waveform to simulate the stress state of the seismic isolation bearing in actual engineering.

[0043] The controller can adjust the output of each driver 101 in real time according to the preset experimental curve to complete various test items such as static load mechanical performance test, dynamic load fatigue test, and reciprocating shear test of the seismic isolation bearing.

[0044] Example 2: Based on Example 1, such as Figure 5 As shown, in order to quickly connect the workpiece 104 to be tested and the corresponding bracket 103, a clamping and positioning mechanism is provided on the bracket 103 used to hold the workpiece 104 to be tested.

[0045] In traditional seismic isolation bearing experiments, the two ends of the workpiece 104 to be tested are usually fixed to the bracket 103 by bolts. The disassembly and assembly steps are cumbersome and the experimental efficiency is low. The clamping and positioning mechanism in this embodiment is used to realize the quick clamping and reliable connection between the workpiece 104 to be tested and the bracket 103, and effectively restricts the relative sliding between the workpiece and the bracket 103 during the shearing experiment.

[0046] The clamping and positioning mechanism includes a plurality of clamping blocks 106 evenly distributed around a preset center. Each clamping block 106 is configured to achieve radial locking when the workpiece 104 to be tested is placed in and subjected to a loading force, thereby reliably clamping and positioning the workpiece.

[0047] In this embodiment, as Figure 6As shown, the clamping blocks 106 of each clamping and positioning mechanism are radially slidable along a preset center. The body of each clamping block 106 floats up and down relative to its sliding trajectory via an elastic element. The elastic element includes a spring 109 and a guide rod 105. The lower part of the guide rod 105 is connected to the sliding track 108 to achieve radial sliding. The spring 109 is sleeved on the outside of the guide rod 105, and its lower end acts on the body of the clamping block 106, providing a downward elastic force to the body of the clamping block 106.

[0048] In its natural state, the body of each locking block 106 floats downward under the elastic force of the spring 109 and locks with the bracket 103, thereby fixing the position of the locking block 106.

[0049] In this embodiment, as Figure 6 As shown, the locking structure is specifically as follows: The lower end face of the block 106 is provided with engagement teeth, and the bracket 103 is provided with corresponding locking teeth 107. The elastic element drives the block 106 to move toward the locking teeth 107 on the bracket 103, so that the engagement teeth and locking teeth 107 mesh with each other, thereby locking the block 106 and the locking teeth 107.

[0050] When clamping the workpiece 104 to be tested, the elastic force of the elastic element can be overcome first to lift the clamping block 106 upward, so that the biting teeth and locking teeth 107 disengage. Then, the position of each clamping block 106 relative to the preset center is adjusted radially so that the clamping area formed by each clamping block 106 matches the shape of the workpiece 104 to be tested, and the alignment adjustment between the workpiece 104 to be tested and the clamping and positioning mechanism is achieved. After the adjustment is in place, the clamping block 106 is released. Under the action of the elastic element, the clamping block 106 returns to its original position and re-locks with the bracket 103, thereby fixing the clamping block 106 in the set position to meet the clamping requirements of workpieces 104 of different sizes.

[0051] Example 3: Based on Example 2, such as Figure 7 As shown, in this embodiment, each of the clamping and positioning blocks 106 adopts a synchronous radial adjustment structure, and the remaining structure and working principle are the same as in Embodiment 1.

[0052] In this embodiment, the line connecting the two opposing clamping blocks 106 of the clamping and positioning mechanism passes through a preset center, and the two opposing clamping blocks 106 are connected by a transmission mechanism to achieve synchronous radial movement.

[0053] During the adjustment process, the two opposing clamping blocks 106 can move closer to or further away from the preset center synchronously, thereby ensuring that the workpiece 104 to be tested is always in the clamping center position, realizing automatic centering and avoiding the impact of clamping eccentricity on the experimental results.

[0054] The transmission mechanism is used to synchronously transmit power to two oppositely arranged locking blocks 106, ensuring that the radial displacements of the two locking blocks 106 are equal in magnitude and opposite in direction.

[0055] In this embodiment, the transmission mechanism is implemented by a linkage mechanism, that is, a set of hinged links 110 are connected to two opposite blocks 106 respectively. When one block 106 is driven to move radially, the linkage mechanism drives the other block 106 to move synchronously and in the opposite direction, thereby realizing the synchronous radial adjustment of the two blocks 106.

[0056] As a further alternative, the transmission mechanism can also be implemented using a gear and rack mechanism or a lead screw mechanism. When using a gear and rack mechanism, the two opposing locking blocks 106 are respectively connected to the rack, and the rack meshes with the same gear. The rotation of the gear drives the two racks and locking blocks 106 to move radially synchronously. When using a lead screw mechanism, the lead screw adopts a bidirectional thread structure, and the two opposing locking blocks 106 respectively engage with the forward thread section and the reverse thread section. The rotation of the lead screw drives the two locking blocks 106 to move synchronously closer to or further away from the preset center.

[0057] The above-described embodiments are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multidimensional hybrid experimental loading platform for vibration isolation device experiments, characterized in that, Includes a rack (102), drive components, and a controller; The drive assembly includes a driver (101) whose force application directions are spatially orthogonal to each other and a bracket (103) that moves under the drive of each driver (101). Among them, the driver (101) arranged along the first direction drives the corresponding bracket (103) to slide along the frame (102), the driver (101) arranged along the second direction drives the corresponding bracket (103) to slide along the bracket (103) driven by the driver (101) arranged in the first direction, and the driver (101) arranged along the third direction drives the corresponding bracket (103) to slide along the frame (102). The workpiece to be tested (104) is clamped between a bracket (103) driven by a driver (101) set in the second and third directions; The controller is electrically connected to each driver (101) and is used to issue action commands to each driver (101); The first-direction driver (101) and the second-direction driver (101) work together to form a composite motion, causing the workpiece (104) to be subjected to shear load, and the third-direction driver (101) moves to cause the workpiece (104) to be subjected to compressive load.

2. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 1, characterized in that, Each bracket (103) is provided with a guide mechanism between itself and the corresponding sliding contact component.

3. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 2, characterized in that, The guiding mechanism consists of a sliding groove and a sliding block that cooperate with each other.

4. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 1, characterized in that, The bracket (103) used to hold the workpiece (104) to be tested is provided with a clamping and positioning mechanism; The clamping and positioning mechanism includes a plurality of clamping blocks (106) evenly distributed around a preset center. Each card block (106) is constructed as follows: Radial locking occurs when the workpiece (104) to be tested is placed in and subjected to a loading force.

5. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 4, characterized in that, Each of the clamping and positioning mechanisms has a locking block (106) that slides radially along a preset center. The body of each locking block (106) and its own sliding trajectory float up and down through an elastic element. In its natural state, the body of each locking block (106) floats down and locks with the bracket (103) it is located in.

6. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 5, characterized in that, The main body of the card block (106) is provided with a biting tooth, and the card block (106) is provided with a locking tooth (107). The elastic element drives the locking block (106) toward the locking tooth (107).

7. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 5, characterized in that, The line connecting the two opposing clamping blocks (106) of each clamping and positioning mechanism passes through the preset center and achieves synchronous radial movement through the transmission mechanism.

8. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 7, characterized in that, The transmission mechanism is implemented through any one of the following methods: gear and rack mechanism, linkage mechanism, and lead screw mechanism.

9. The multidimensional hybrid experimental loading platform for vibration isolation device experiments as described in claim 1, characterized in that, Pressure sensors are provided between the driver (101) and the driven bracket (103), and displacement sensors are provided between each bracket (103) and the frame (102).

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