A Modal-Based Bridge Damage Identification Device

Abstract

This utility model discloses a modal-based bridge damage identification device in the field of bridge damage identification technology. The device includes a housing, with acceleration sensors mounted on the bottom and adjacent side walls of the housing. A power supply module is mounted on the bottom of the housing, and a controller is mounted inside the housing and next to the power supply module. A communication module is mounted on one side of the controller. Fasteners are mounted on the bottom and sides of the housing. Three acceleration sensors are mounted along the X, Y, and Z axes respectively. The fasteners secure the acceleration sensors, preventing them from shifting or shaking, and also reducing and protecting them from vibration and shaking.

Description

Technical Field

[0001] This utility model relates to the field of bridge damage identification, specifically a modal-based bridge damage identification device. Background Technology

[0002] In the field of bridge structural health monitoring, modal damage identification technology, due to its sensitivity to the overall performance of the structure, has become an important means of assessing the safety status of bridges. This technology collects bridge vibration signals by deploying accelerometers, extracts modal parameters such as natural frequencies and mode shapes, and then determines whether there is damage to the structure. Currently, to achieve the acquisition of multi-directional vibration signals, three accelerometers are usually installed at key parts of the bridge. However, the existing sensor installation methods have many problems, which seriously affect the accuracy of damage identification and the practicality of the device.

[0003] Existing accelerometer sensors are mostly fixed with bolts, a method that has revealed significant drawbacks during the long-term service of bridges. Firstly, bridges experience continuous vibrations under external forces such as vehicle loads and wind, and bolts are prone to loosening under repeated vibration loads, even leading to stripping or detachment. If the sensor installation is unstable, the collected vibration signals will contain additional interference noise, causing deviations in modal parameter extraction and affecting the reliability of damage identification results. For example, additional vibrations caused by sensor loosening may be misinterpreted as damage characteristics of the bridge structure, leading to misdiagnosis; while severe loosening or detachment can directly cause data acquisition interruption, bringing monitoring work to a standstill.

[0004] Secondly, the bolt-mounted installation method greatly inconveniences the disassembly and installation of sensors. When sensors need calibration, replacement, or maintenance, operators must use specialized tools to tighten each bolt individually. This is especially problematic in special installation locations such as high-altitude or confined spaces on bridges, where operating space is limited. This process is not only time-consuming and labor-intensive but also carries the risk of damaging the sensors or the bridge structure due to improper handling. For scenarios requiring periodic rotation of sensor locations to obtain more comprehensive data, this cumbersome disassembly and assembly process significantly reduces work efficiency and increases monitoring costs.

[0005] Furthermore, the bolted installation lacks an effective buffer structure, failing to provide stable protection for the accelerometer. The impact forces generated during bridge vibration are directly transmitted to the sensor, which, over time, can easily lead to fatigue damage to internal components, shortening its lifespan. Simultaneously, the rigid connection method makes the sensor overly sensitive to high-frequency vibrations, potentially including excessive interference from non-structural vibrations in the acquired signals. This affects the accuracy of modal parameter extraction, thereby reducing the practicality of the damage identification device. Therefore, a modal-based bridge damage identification device needs to be designed to address these issues. Utility Model Content

[0006] The purpose of the present utility model is to provide a modal-based bridge damage identification device to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present utility model provides the following technical solution: A modal-based bridge damage identification device includes the housing of the identification device. An acceleration sensor is respectively installed at the bottom and adjacent two side walls of the housing. A power supply module is installed at the bottom of the housing. A controller is installed inside the housing and located at the power supply module. A communication module is installed on one side of the controller. Buckle parts are respectively installed at the bottom and both sides of the housing, and the buckle parts are used to install the acceleration sensor.

[0008] Preferably, the buckle part includes a buckle plate fixedly installed on both sides and the bottom inside the housing through bolts. A movable buckle plate is slidably installed inside the housing and on the opposite side of the buckle plate. A fixed block is fixedly connected to the other side of the movable buckle plate. A first screw rod is screwed inside the fixed block. Guide grooves are respectively opened on both sides and the bottom inside the housing. A guide block is fixedly connected to one side of the movable buckle plate. A lock groove for providing a locking space for the first screw rod is opened on the other side of the guide groove.

[0009] Preferably, the buckle part further includes a second screw rod respectively penetrating through the buckle plate and the movable buckle plate. A sliding plate is sleeved and screwed on the outer side of the second screw rod, and an anti-slip pad is on one side of the sliding plate.

[0010] Preferably, elastic frames are respectively fixedly connected to the inner sides of the buckle plate and the movable buckle plate.

[0011] Preferably, two groups of elastic pieces are fixedly connected to the inner side of the elastic frame, and each group of elastic pieces includes two and is fixedly connected.

[0012] Preferably, rubber gasket strips are respectively laid on the inner sides of the movable buckle plate and the buckle plate.

[0013] Preferably, the cross sections of the guide block and the guide groove are both "convex" shaped.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. The power supply module is electrically connected to and supplies power to the three acceleration sensors and the communication module through the controller. The three acceleration sensors are respectively installed in the X, Y, and Z three axial directions. The buckle parts are used for buckling and fixing the acceleration sensors, preventing the acceleration sensors from shifting or shaking, and at the same time, it can also reduce and protect the seismic resistance and shaking amplitude of the acceleration sensors.

[0016] 2. Both the snap-on plate and the movable snap-on plate are arc-shaped. The acceleration sensor is placed inside the snap-on plate. The movable snap-on plate then drives the guide block to slide in the guide groove. After the first screw is screwed and rotated with the fixed block, it is inserted into the locking groove in the guide groove to lock and fix the movable snap-on plate. This allows the movable snap-on plate and the snap-on plate to snap and fix the acceleration sensor, improving the convenience and stability of locking and fixing the acceleration sensor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a left-side sectional perspective view of the overall structure of this utility model;

[0019] Figure 3 The overall structure of this utility model Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 The overall structure of this utility model Figure 3 Enlarged view of section B in the middle.

[0021] In the diagram: 1. Housing; 2. Accelerometer; 3. Power supply module; 4. Controller; 5. Communication module; 6. Buckle plate; 7. Movable buckle plate; 8. Fixing block; 9. First screw; 10. Guide groove; 11. Guide block; 12. Locking groove; 13. Second screw; 14. Sliding plate; 15. Anti-slip pad; 16. Elastic frame; 17. Spring; 18. Rubber pad strip. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] Please refer to Figure 1-4 As shown, this utility model provides a bridge damage identification device based on modality, including a housing 1 of the identification device, an acceleration sensor 2 installed on the bottom and adjacent side walls of the housing 1, a power supply module 3 installed on the bottom of the housing 1, a controller 4 installed inside the housing 1 and located on the power supply module 3, a communication module 5 installed on one side of the controller 4, and fasteners installed on the bottom and sides of the housing 1, the fasteners being used to install the acceleration sensor 2.

[0025] As should be added, the power supply module 3 is electrically connected to and powered by the three acceleration sensors 2 and the communication module 5 through the controller 4. The three acceleration sensors 2 are installed in the X, Y and Z axes respectively. The acceleration sensors 2 are fixed and installed by snap fasteners to prevent the acceleration sensors 2 from shifting or shaking. At the same time, it can also reduce and protect the acceleration sensors 2 from shock and shaking.

[0026] Specifically, the fastener includes a fastening plate 6 that is fixedly installed to the inside of the housing 1 on both sides and the bottom by bolts. A movable fastening plate 7 is slidably installed inside the housing 1 on the opposite side of the fastening plate 6. A fixing block 8 is fixedly connected to the other side of the movable fastening plate 7. A first screw 9 is screwed into the inside of the fixing block 8. Guide grooves 10 are respectively opened on both sides and the bottom of the inside of the housing 1. A guide block 11 is fixedly connected to one side of the movable fastening plate 7. A locking groove 12 for providing locking space for the first screw 9 is opened on the other side of the guide groove 10. The fastener also includes a second screw 13 that passes through the fastening plate 6 and the movable fastening plate 7 respectively. A sliding plate 14 is fitted and screwed to the outside of the second screw 13. An anti-slip pad 15 is on one side of the sliding plate 14. The cross-sections of the guide block 11 and the guide groove 10 are both "convex" shaped.

[0027] Both the snap-on plate 6 and the movable snap-on plate 7 are arc-shaped. The accelerometer 2 is placed inside the snap-on plate 6. The movable snap-on plate 7 drives the guide block 11 to slide in the guide groove 10. After the first screw 9 is screwed and rotated with the fixing block 8, it is inserted into the locking groove 12 in the guide groove 10 to lock and fix the movable snap-on plate 7. This allows the movable snap-on plate 7 and the snap-on plate 6 to snap and fix the accelerometer 2. Then, the second screw 13 drives the sliding plate 14 to move, so that the anti-slip pad 15 on one side of the sliding plate 14 presses and fixes the accelerometer 2 on the other side, improving the convenience and stability of locking and fixing the accelerometer 2.

[0028] More specifically, elastic frames 16 are fixedly connected to the inner side of the buckle plate 6 and the inner side of the snap fastener plate 7 respectively. Two sets of spring pieces 17 are fixedly connected to the inner side of the elastic frame 16. Each set of spring pieces 17 includes two pieces and is fixedly connected. Rubber pads 18 are laid on the inner side of the snap fastener plate 7 and the inner side of the buckle plate 6 respectively.

[0029] Furthermore, the rubber pad 18 wraps around the outside of the accelerometer 2 to reduce the shaking amplitude of the accelerometer 2 and prevent the accelerometer 2 from sliding or shaking. The elastic frame 16 can press and fix the sliding plate 14, so that the anti-slip pad 15 on one side of the sliding plate 14 fits against the other side of the accelerometer 2, thereby improving the anti-vibration effect of the sliding plate 14 in fixing the accelerometer and reducing the shaking amplitude.

[0030] Working principle: First, the accelerometer 2 is placed inside the buckle plate 6, and the rubber pad 18 wraps around the outside of the accelerometer 2. Then, the snap fastener 7 drives the guide block 11 to slide in the guide groove 10. After the first screw 9 is screwed and rotated with the fixing block 8, it is inserted into the locking groove 12 in the guide groove 10 to lock and fix the snap fastener 7. At this time, the snap fastener 7 and the buckle plate 6 lock and fix the accelerometer 2. Then, the second screw 13 is used to drive the sliding plate 14 to move. At this time, the anti-slip pad 15 on one side of the sliding plate 14 presses and fixes the other side of the accelerometer 2.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modal based bridge damage identification device comprising a housing (1) of the identification device, characterized in that: Accelerometers (2) are installed on the bottom and adjacent side walls of the housing (1). A power supply module (3) is installed on the bottom of the housing (1). A controller (4) is installed inside the housing (1) and located on the power supply module (3). A communication module (5) is installed on one side of the controller (4). Fasteners are installed on the bottom and sides of the housing (1). The fasteners are used to install the accelerometers (2).

2. The bridge damage identification device based on modality according to claim 1, characterized in that: The fastener includes a fastening plate (6) that is fixedly installed to the inside of the housing (1) on both sides and the bottom by bolts. A movable fastening plate (7) is slidably installed inside the housing (1) on the opposite side of the fastening plate (6). A fixing block (8) is fixedly connected to the other side of the movable fastening plate (7). A first screw (9) is screwed into the inside of the fixing block (8). Guide grooves (10) are respectively opened on both sides and the bottom of the inside of the housing (1). A guide block (11) is fixedly connected to one side of the movable fastening plate (7). A locking groove (12) is opened on the other side of the guide groove (10) to provide locking space for the first screw (9).

3. The bridge damage identification device based on modality according to claim 2, characterized in that: The fastener also includes a second screw (13) that passes through the fastener plate (6) and the snap fastener plate (7) respectively. A sliding plate (14) is fitted and screwed onto the outside of the second screw (13), and an anti-slip pad (15) is on one side of the sliding plate (14).

4. The bridge damage identification device based on modality according to claim 3, characterized in that: The inner side of the buckle plate (6) and the inner side of the snap plate (7) are respectively fixedly connected to the elastic frame (16).

5. A bridge damage identification device based on modal characteristics according to claim 4, characterized in that: The inner side of the elastic frame (16) is fixedly connected with two sets of spring pieces (17), each set of spring pieces (17) includes two pieces and is fixedly connected.

6. The bridge damage identification device based on modality according to claim 5, characterized in that: Rubber pads (18) are laid on the inner side of the snap-on plate (7) and the inner side of the snap-on plate (6).

7. The bridge damage identification device based on modality according to claim 3, characterized in that: The cross-sections of the guide block (11) and the guide groove (10) are both "convex".

Images