Angular displacement damping device and use thereof
By designing a cross-shaped sliding limit disk structure and a multi-directional coupling vibration reduction mechanism, the problem of decreased measurement accuracy of the DIC testing system under large vibration table experimental environment was solved. This achieved the preservation of all-round translational displacement and multi-dimensional vibration energy dissipation, thereby improving measurement accuracy and system stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TIANJIN UNIV
- Filing Date
- 2026-02-24
- Publication Date
- 2026-05-26
AI Technical Summary
In the experimental environment of a large shaking table, the measurement accuracy of the DIC test system decreases due to the transmission of ground vibration through the support device. Existing vibration damping devices without angular displacement are difficult to retain translational displacement while restricting rotational degrees of freedom, and the spring damper arrangement structure is simple, resulting in nonlinear interference and low vibration reduction efficiency.
A vibration reduction device without angular displacement was designed. It adopts a cross-shaped sliding limiting disk structure to limit the angular displacement of the equipment platform while retaining the translational degrees of freedom in all directions. The translational displacement is stably transmitted through a floating plate and parallel linkage structure. Combined with a multi-directional coupling vibration reduction mechanism, the vertical and horizontal vibration energy is dissipated simultaneously, thus constructing a multi-dimensional collaborative vibration reduction system.
It effectively blocked the transmission path of ground vibration to the DIC testing system, improved measurement accuracy, and achieved the effects of precise and efficient force transmission, stable and reliable structure, and comprehensive vibration reduction coverage, significantly improving the measurement stability and accuracy of the DIC system.
Smart Images
Figure CN122083103A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of DIC testing system technology, and more particularly to a vibration damping device without angular displacement and its application, especially suitable for DIC testing systems in large vibration table test environments. Background Technology
[0002] Angular displacement-free vibration damping device: This type of vibration damping device, which consists of a mechanism and damping elements, restricts the rotation of the optical platform through a special connecting mechanism, thereby suppressing angular displacement.
[0003] Large-scale shaking table test environment: refers to a comprehensive scientific experimental platform that can realistically simulate earthquakes and test full-scale or large-scale model structures (such as buildings, bridges, dams, nuclear power facilities, etc.).
[0004] DIC Testing System: The DIC testing system is a non-contact full-field optical measurement system based on digital image processing technology. By analyzing the speckle image changes on the surface of the object under test, and combining a support device with a high-precision camera, it can acquire the three-dimensional displacement field and strain field in real time.
[0005] To deeply explore the seismic performance of engineering projects and the mechanism of earthquake failure, shaking table testing is an essential means. Displacement-in-contact (DIC) technology, as a non-contact measurement method, is widely used in shaking table testing due to its advantages such as no mass-related interference and high spatial resolution. However, with the increase in the size and load-bearing capacity of shaking tables, the problem of decreased measurement accuracy of DIC testing systems caused by environmental vibrations generated in large shaking table testing environments has become increasingly prominent and cannot be ignored.
[0006] The DIC testing system mainly consists of a support device and optical equipment. In a large vibration table test environment, the support device is subject to ground vibration interference, which transmits vibration energy to the camera body, leading to a decrease in measurement accuracy. Therefore, effectively dissipating energy along the vibration transmission path is the core key to improving DIC measurement accuracy.
[0007] Current research on vibration reduction for optical equipment mainly focuses on airborne and automotive applications. Given the vibration reduction and angular displacement suppression requirements of DIC optical platforms, and considering the design concepts of existing angular displacement-free vibration reduction devices for these platforms, as well as practical constraints such as installation space, weight, and size, designing an angular displacement-free vibration reduction system suitable for this scenario is of great necessity.
[0008] Although the existing design methods based on non-angular displacement vibration reduction devices meet the needs of vehicle and airborne fields to a certain extent, their application in the DIC system under large vibration table test environment still has limitations: (1) When constructing a parallelogram mechanism, the existing device is difficult to retain translational displacement to the maximum extent while completely restricting the rotational degree of freedom; (2) The spring damper arrangement structure is simple, and most of them adopt the hinge form, which has nonlinear interference factors such as gaps and friction, and cannot achieve the ideal effect of accurate and efficient force transmission without gaps; (3) The spring damper lacks the coupling and synergistic vibration reduction effect. The existing device only arranges dampers separately in the horizontal and vertical directions, which makes it difficult to achieve the synergistic effect between multiple dampers.
[0009] The research aims to achieve three core objectives: first, to design a novel disk structure that effectively restricts rotational degrees of freedom while preserving the translational displacement of the equipment platform to the maximum extent; second, to improve the connection form of the spring dampers in the existing device to achieve the effect of small error and high force transmission efficiency; and third, to innovate the damper arrangement method to realize the synergistic coupling vibration reduction effect of spring dampers under multiple degrees of freedom. Summary of the Invention
[0010] In view of this, to address the technical problem of decreased measurement accuracy caused by ground vibration transmitted to the DIC testing system through support devices in large-scale shaking table experimental environments, this invention provides a non-angular displacement vibration reduction device and its application. This device restricts the angular displacement of the equipment platform while preserving omnidirectional translational degrees of freedom by setting an angular displacement limiting mechanism; stably transmits translational displacement using a floating plate and parallel linkage structure; and synchronously dissipates vertical and horizontal vibration energy using a diagonally parallel multi-directional coupling vibration reduction mechanism, thus constructing a multi-dimensional collaborative non-angular displacement vibration reduction system. This effectively blocks the transmission path of ground vibration to the DIC testing system in large-scale shaking table experimental environments, significantly improving the measurement accuracy of the DIC testing system. Furthermore, it features precise and efficient force transmission, structural stability and reliability, and comprehensive vibration reduction coverage.
[0011] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a vibration damping device without angular displacement, comprising: Equipment platform; Base; An angular displacement limiting mechanism is disposed below the equipment platform to limit the angular displacement of the equipment platform while preserving all-round translational degrees of freedom; A floating plate, connected to the angular displacement limiting mechanism and the base by a parallel linkage structure, is used to transmit translational displacement; A multi-directional coupling vibration damping mechanism is arranged obliquely in parallel between the equipment platform and the base to synchronously dissipate vertical and horizontal vibration energy.
[0012] Preferably, the angular displacement limiting mechanism is a cross-shaped sliding limiting disk structure, including an upper slider, a cross slider, and a lower slider arranged sequentially from top to bottom; a perpendicularly intersecting unidirectional kinematic pair is respectively provided between the upper slider and the cross slider, and between the cross slider and the lower slider.
[0013] Preferably, the upper slider is fixedly connected to the equipment platform, and the lower slider is fixedly connected to the floating plate.
[0014] Preferably, the multi-directional coupling vibration reduction mechanism includes several elastic damping units, which are connected to the equipment platform and the base respectively using a double ball-head bolt connection method.
[0015] Preferably, the number of elastic damping units is six, arranged in a six-degree-of-freedom ring.
[0016] Preferably, the elastic damping unit is a spring damper.
[0017] Preferably, the parallel linkage structure includes at least three guide rods, which are interference-fitted with the base to allow relative axial movement between the floating plate and the guide rods.
[0018] Preferably, the guide rod is a plug bolt.
[0019] Preferably, the angular displacement limiting mechanism is in the form of a disc.
[0020] Secondly, the present invention provides the application of the above-mentioned non-angular displacement vibration reduction device in a DIC testing system under a large vibration table test environment.
[0021] Compared with the prior art, the present invention has the following beneficial effects: Precise angular displacement control ensures the stability of optical measurements: Through a three-layer cross-shaped sliding limit disk structure, using perpendicularly intersecting unidirectional kinematic pairs, the rotational degree of freedom of the equipment platform is completely restricted while retaining its omnidirectional translational capability, avoiding attitude deviation of the DIC system optical equipment caused by angular displacement, and reducing measurement errors at the source.
[0022] Seamless and efficient force transmission, reducing nonlinear interference: The spring damper uses a double ball-head bolt connection to connect the equipment platform and the base, eliminating nonlinear factors such as gaps and friction in traditional hinged structures, achieving precise and efficient vibration energy transmission path, and reducing energy loss and additional errors.
[0023] Multi-degree-of-freedom coupled vibration reduction, covering all-dimensional vibration: Six spring dampers are arranged in a six-degree-of-freedom ring oblique parallel configuration, which can simultaneously dissipate vertical and horizontal vibration energy and realize the synergistic coupling effect between dampers. Compared with traditional single / bidirectional vibration reduction design, it can more comprehensively cope with the complex vibration interference in the large shaking table test environment.
[0024] Parallel linkage stabilizes force transmission and blocks angular displacement transmission: The floating plate is connected to the base through guide rods (preferably guide rods of equal length) to form a parallel linkage mechanism, which can stably transmit the translational displacement of the equipment platform and block the transmission of angular displacement to the base, further enhancing the system's anti-interference capability and ensuring the stability of the DIC system's measurement process.
[0025] Adaptable to large-scale experimental scenarios and highly practical: The overall structural design fully considers the equipment installation space, weight and size requirements of large-scale shaking table experimental environments, and can effectively cope with strong vibration interference in full-scale or large-scale model experiments, providing reliable vibration reduction support for the DIC system.
[0026] Error truncation at the source significantly improves accuracy: By directly dissipating energy along the vibration transmission path, the error chain is truncated at the source, which can significantly improve the measurement accuracy of the DIC system compared to traditional accuracy compensation post-processing methods; vibration simulation verification shows that the vibration reduction effect is very significant under the influence of different seismic wave accelerations. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the angular displacement limiting mechanism; Figure 3 This is an exploded view of the angular displacement limiting mechanism; Figure 4 This is an exploded view of the vibration damping device without angular displacement of the present invention; Figure 5 This is a three-dimensional design drawing of the present invention; Figure 6 The apparent displacement of the DIC system after each seismic wave action without vibration damping device installed; Figure 7 The apparent displacement of the DIC system after each seismic wave action when the vibration damping device is installed; Figure 8 This is a diagram illustrating the vibration reduction effect. In the diagram, 1 is the equipment platform; 2 is the base; 3 is the angular displacement limiting mechanism; 31 is the upper slider; 32 is the cross slider; 33 is the lower slider; 34 is the limiting pin; 4 is the floating plate; 5 is the multi-directional coupling vibration damping mechanism; 51 is the elastic damping unit; and 6 is the guide rod. Detailed Implementation
[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0029] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention.
[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0031] like Figure 1 , 4 As shown in Figure -5, the present invention provides a vibration damping device without angular displacement, comprising: Equipment platform 1, located on the top layer of the device, is used to directly support the optical equipment of the DIC testing system. As the mounting carrier for the DIC optical equipment, it transmits the vibration energy of the equipment itself and external sources to the vibration damping mechanism below, while simultaneously receiving the reaction force of the vibration damping mechanism to achieve vibration suppression.
[0032] Base 2 is located at the bottom of the device and is fixed to the ground or supporting structure of the large vibration table test environment.
[0033] As the foundation support of the entire vibration damping device, it bears the weight of all the components above, transmits and dissipates vibration energy to the ground, and provides a fixed connection point for the parallel linkage structure and elastic damping unit 51 described below.
[0034] An angular displacement limiting mechanism 3 is disposed below the device platform 1 to limit the angular displacement of the device platform 1 and retain the omnidirectional translational degrees of freedom, thereby preventing the angular displacement from causing the attitude deviation of the DIC optical device.
[0035] The floating plate 4 connects the angular displacement limiting mechanism 3 and the base 2 through a parallel linkage structure. It receives the translational displacement transmitted by the angular displacement limiting mechanism 3 and stably transmits it to the base 2 through the parallel linkage structure. At the same time, it blocks the transmission of angular displacement to the base 2, further enhancing the system's anti-interference capability.
[0036] The multi-directional coupling vibration damping mechanism 5 is arranged obliquely in parallel between the equipment platform 1 and the base 2 to synchronously dissipate vertical and horizontal vibration energy.
[0037] This technical solution employs a hierarchical force transmission path: "Equipment Platform 1 - Angular Displacement Limiting Mechanism 3 - Floating Plate 4 - Parallel Linkage Structure - Base 2". The angular displacement limiting mechanism 3 restricts the angular displacement of the equipment platform 1 while preserving omnidirectional translational freedom. The floating plate 4 stably transmits translational displacement through the parallel link structure. Multi-directional coupling vibration damping mechanisms 5 are arranged obliquely in parallel to simultaneously dissipate vertical and horizontal vibration energy, constructing a multi-dimensional collaborative vibration damping system. It integrates angular displacement control, translational transmission, and multi-directional vibration damping functions, dissipating energy along the vibration transmission path and providing core support for improving the measurement accuracy of the DIC testing system.
[0038] like Figure 2-3 As shown, in this invention, the angular displacement limiting mechanism 3 is a cross-shaped sliding limiting disc structure, comprising three layers arranged sequentially from top to bottom: an upper slider 31, a cross slider 32, and a lower slider 33. Vertically intersecting unidirectional kinematic pairs are respectively set between the upper slider 31 and the cross slider 32, and between the cross slider 32 and the lower slider 33. Through the principle of the cross slide table, while allowing the device platform 1 to translate in all directions, its rotational degree of freedom is completely restricted. This precisely blocks the angular displacement transmission path, preventing attitude deviation of the DIC optical device and solving the defect of existing technologies that cannot simultaneously restrict rotational degree of freedom and retain translational displacement. This invention can also provide a limiting pin 34 on the upper slider 31 for vertical and horizontal limiting, restricting the range of motion and preventing detachment.
[0039] In this invention, the upper slider 31 is fixedly connected to the equipment platform 1, and the lower slider 33 is fixedly connected to the floating plate 4. For example, several (e.g., four) threaded holes are provided on each of the cross slider 32, upper slider 31, and lower slider 33. These holes correspond to the bolt holes on the equipment platform 1 and the floating plate 4, respectively, and are bolted together with screws. The upper slider 31 is fixedly connected to the equipment platform 1, and the lower slider 33 is fixedly connected to the floating plate 4, stably transmitting the translational displacement of the equipment platform 1 to the floating plate 4. Simultaneously, a limiting mechanism restricts the transmission of angular displacement from the equipment platform 1 to the floating plate 4. This achieves a rigid connection between the limiting mechanism and the equipment platform 1 and the floating plate 4, ensuring the stability of the translational displacement transmission and the reliability of the angular displacement limitation, and avoiding errors caused by loose connections.
[0040] In this invention, the multi-directional coupling vibration damping mechanism 5 includes several elastic damping units 51. These elastic damping units 51 are connected to the equipment platform 1 and the base 2 respectively using a double-ball-head bolt connection, eliminating nonlinear factors such as gaps and friction in traditional hinged structures. This ensures a precise and efficient vibration energy transmission path, dissipating vibration energy through elastic damping characteristics. It reduces nonlinear interference, improves the efficiency of vibration energy transmission and dissipation, and solves the problems of large errors and inefficient force transmission in existing hinged structures.
[0041] In this invention, the number of elastic damping units 51 is six, arranged in a six-degree-of-freedom ring to form a synergistically coupled vibration reduction network, which can synchronously respond to and dissipate vibration energy in all dimensions, including vertical and horizontal. This achieves multi-degree-of-freedom coupled vibration reduction, covering complex vibration interference in large shaking table test environments, and provides more comprehensive vibration reduction dimensions compared to traditional single / bidirectional vibration reduction designs.
[0042] In this invention, the elastic damping unit 51 is a spring damper. The elastic deformation of the spring damper absorbs vibration energy, and the damping characteristics dissipate energy, thus achieving buffering and attenuation of vibration. Employing a mature and reliable spring damper structure, it combines elastic buffering and damping dissipation functions, resulting in a stable and controllable vibration reduction effect.
[0043] In this invention, the parallel linkage structure includes at least three guide rods 6. The three guide rods 6 are interference-fitted with the base 2, allowing relative axial movement between the floating plate 4 and the guide rods 6. This forms a three-dimensional parallel linkage mechanism, stably transmitting translational displacement while blocking angular displacement transmission. It constructs a backlash-free translational transmission path, preventing angular displacement from being transmitted to the base 2, improving the overall stability of the system, and solving the problem of insufficient force transmission accuracy in existing parallel linkage mechanisms. Preferably, the guide rods 6 are of equal length.
[0044] In this invention, the guide rod 6 is a plug bolt. As a high-strength guide rod 6, the plug bolt is fixed to the base 2 via an interference fit, providing rigid support for the parallel linkage mechanism and ensuring the structural stability of the guide rod 6 under vibration conditions. Utilizing the high strength characteristics of the plug bolt enhances the vibration resistance of the parallel linkage mechanism and avoids force transmission errors caused by loosening or deformation of the guide rod 6.
[0045] In this invention, the angular displacement limiting mechanism 3 is an overall disc structure. It can adapt to the installation space of the DIC testing system while ensuring a compact layout of the three-layer slider, achieving efficient coordination of translational and angular displacement control. Its compact structure adapts to the equipment installation space, weight, and size requirements of the DIC system in a large vibration table experimental environment, enhancing the practicality of the device.
[0046] This invention also provides the application of the aforementioned angular displacement-free vibration damping device in a DIC testing system under a large-scale shaking table experimental environment. By applying the angular displacement-free vibration damping device to a DIC testing system under a large-scale shaking table experimental environment, the interference of ground vibration on DIC optical equipment is reduced by blocking the transmission of angular displacement and dissipating vibration energy. This specifically addresses the problem of decreased measurement accuracy in DIC testing systems under large-scale shaking table experimental environments. Vibration simulation verification shows that it can significantly improve the accuracy of the DIC line of sight, with effects superior to traditional accuracy compensation post-processing methods.
[0047] Assemble the above-mentioned components to obtain the three-dimensional design drawing of the vibration damping device without angular displacement of the present invention, as shown below. Figure 5 As shown.
[0048] like Figure 6-8 As shown, the vibration damping device of the present invention is assembled into the DIC testing system. Addressing the problem of decreased DIC measurement accuracy caused by ground vibration in a large shaking table experimental environment, the acceleration around the ground of the large shaking table is first measured using an accelerometer to obtain acceleration and time data under different ground motion accelerations. This data is then converted into frequency domain information through Fourier transform. The DIC testing system (with the vibration damping device) is then analyzed using ANSYS. Figure 7 ) and without vibration damping devices ( Figure 6 Vibration simulations were conducted, and the errors in the accuracy of the DIC line of sight were compared. The results showed that the vibration reduction devices achieved significant accuracy improvements under the influence of different seismic wave accelerations.
[0049] The original displacement is Figure 6 The apparent displacement of the DIC system after each seismic wave without vibration damping device. Figure 7 It is the apparent displacement of the DIC system after each seismic wave action following the addition of vibration damping devices.
[0050] The above description is merely a preferred embodiment of the present invention. However, 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 should be covered within the scope of protection of the present invention.
Claims
1. A zero angular displacement vibration damping device characterized by, Comprising: a device platform; a base; an angular displacement limiting mechanism arranged below the device platform for limiting angular displacement of the device platform and retaining full translational freedom; a floating plate connected to the angular displacement limiting mechanism and the base by a parallel link structure for transmitting translational displacement; a multi-directional coupling damping mechanism arranged obliquely in parallel between the device platform and the base for synchronously dissipating vertical and horizontal vibration energy.
2. A zero angular displacement vibration damper according to claim 1, wherein The angular displacement limiting mechanism is a cross slide limiting disc structure, comprising an upper slide, a cross slide and a lower slide arranged in sequence from top to bottom; vertical intersecting single direction kinematic pairs are arranged between the upper slide and the cross slide and between the cross slide and the lower slide respectively.
3. A zero angular displacement vibration damper according to claim 2, wherein The upper slide is fixedly connected to the device platform, and the lower slide is fixedly connected to the floating plate.
4. A zero angular displacement vibration damper according to claim 1, wherein The multi-directional coupling damping mechanism comprises a plurality of elastic damping units, which are connected to the device platform and the base by double ball head bolt connection.
5. A zero angular displacement vibration damper according to claim 4, wherein The number of elastic damping units is six, arranged in a six-degree-of-freedom ring.
6. A zero angular displacement vibration damper according to claim 5, wherein The elastic damping unit is a spring damper.
7. A zero angular displacement vibration damper according to claim 1, wherein The parallel link structure comprises at least three guide rods, and the guide rods are connected to the base by interference fit, allowing relative movement between the floating plate and the guide rods in the axial direction.
8. A zero angular displacement vibration damper according to claim 7, wherein The guide rod is a plug bolt.
9. A zero angular displacement vibration isolation device according to any one of claims 1-8, wherein, The angular displacement limiting mechanism is in the form of a disc structure as a whole.
10. Use of the angular displacement-free damping device of any one of claims 1-9 in a DIC testing system in a large-scale vibration table experimental environment.