Cable-stayed cable multi-dimensional vibration displacement measuring device and method based on compound lever mechanism

Abstract

The application discloses a kind of based on composite lever mechanism's cable-stayed cable multidimensional vibration displacement measuring device and method, device includes horizontal displacement amplification lever, vertical displacement amplification lever and upper fixed plate and lower fixed plate, horizontal limiting pin and vertical limiting pin are respectively threaded in the hollow guide groove of horizontal displacement amplification lever and vertical displacement amplification lever, horizontal displacement measuring shaft passes through the hollow guide groove of upper and lower fixed plate horizontal guide groove and horizontal displacement amplification lever, vertical displacement measuring shaft passes through the hollow guide groove of upper and lower fixed plate vertical guide groove and vertical displacement amplification lever, two laser displacement meters are provided on fixed plate, for measuring horizontal displacement measuring shaft and vertical displacement measuring shaft moving distance.The application realizes the real-time high-precision measurement of in-plane vibration displacement law of cable-stayed cable method, can be used to study cable-stayed cable vibration characteristics, and guide external damper design optimization, improve cable-stayed cable vibration damping efficiency and environmental adaptability, reduce bridge maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of cable-stayed bridge vibration displacement measurement technology. More specifically, this invention relates to a multidimensional vibration displacement measurement device and method for cable-stayed bridges based on a composite lever mechanism. Background Technology

[0002] To suppress vibrations of stay cables under external excitations such as wind and traffic loads, vibration control measures often employ built-in damping rings within steel casings and external dampers installed at certain heights within the beam segments. Built-in damping rings provide omnidirectional vibration reduction, but their proximity to the cable anchorage results in poor damping performance. External dampers are ineffective at suppressing out-of-plane vibrations of stay cables. In recent years, there have been frequent instances of external dampers failing or even breaking under large-amplitude cable vibrations, primarily due to inaccurate understanding of the direction, magnitude, and temporal characteristics of the multi-degree-of-freedom vibration displacements of the stay cables within their normal plane.

[0003] To clarify the vibration characteristics of cable-stayed bridges, high-precision measurement is crucial. However, directly and accurately measuring complex and variable multi-degree-of-freedom vibration displacements under adverse weather conditions presents considerable technical challenges. This is especially true for simultaneous high-precision measurement of vertical and transverse displacements within the cable-stayed bridge plane, where there are orders of magnitude differences. This places high demands on both measurement methods and equipment, making it not only difficult to implement but also prohibitively expensive and difficult to promote. Therefore, conveniently and cost-effectively obtaining accurate displacement values ​​and their variation patterns within the cable-stayed bridge plane is of great significance for improving the out-of-plane vibration control effect of external vibration control devices and ensuring the safe operation of the structure.

[0004] To achieve high-precision measurement of the aforementioned multi-degree-of-freedom vibration displacement, it would be beneficial to decompose it into two independent components—vertical and transverse—within a plane for separate measurement, and eliminate mutual interference between these directions. This would significantly improve the equipment's environmental adaptability, reduce its complexity, and lower its economic cost. Traditional decoupling methods primarily rely on algorithms to mathematically decouple sensor signals (e.g., separating coupled signals through matrix operations), requiring high-precision sensors and involving complex calculations.

[0005] In addition, the existing technology for measuring the vibration displacement of cable stays still has the following shortcomings: (1) When the cable stay displacement is measured directly using a wire sensor, a fixed position is required as a reference point. It is difficult to find a reference point that meets the requirements near the cable stay. In addition, the wire sensor is only suitable for single-direction displacement measurement, which is difficult to meet the multi-degree-of-freedom displacement measurement requirements of cable stays under environmental and traffic loads. (2) The measurement method based on satellite systems such as Beidou is not accurate enough for measuring small-amplitude dynamic displacements, and the equipment cost is high, which is not conducive to large-scale promotion and use. (3) The traditional method of taking images of cable stay vibrations with a single camera and extracting displacement information by combining edge line image processing algorithms requires a wide field of view and fixed video equipment. It is also difficult to accurately obtain the transverse and vertical vibration displacements of the cable stay at the same time. The environmental adaptability is poor, and the image processing technology is also relatively complex. (4) When installing accelerometers on the cable stay and obtaining displacement through integration, the selection of boundary conditions is very easy to introduce large errors, affecting the accuracy of the measurement results.

[0006] The aforementioned shortcomings limit in-depth research on the vibration characteristics of stay cables and also restrict the effectiveness of existing damping devices in stay cable vibration control. Therefore, this application proposes a multi-dimensional vibration displacement enhancement measurement device and method for stay cables based on a composite lever mechanism. Summary of the Invention

[0007] One objective of this invention is to provide a multidimensional vibration displacement increment device and method for cable-stayed bridges based on a composite lever mechanism. This device enables real-time, high-precision measurement of the vibration displacement law in the plane of the cable-stayed bridge. It can be used to study the vibration characteristics of cable-stayed bridges, guide the design optimization of external dampers, improve the vibration suppression efficiency and environmental adaptability of cable-stayed bridges, and reduce bridge maintenance costs.

[0008] To address the aforementioned technical problems, this invention provides a multi-dimensional vibration displacement measuring device for a stay cable based on a composite lever mechanism. The device includes a lateral displacement amplifying lever perpendicular to the cable axis, a vertical displacement amplifying lever forming an L-shape with the lateral displacement amplifying lever, and an upper and lower fixing plate sandwiching the lateral and vertical displacement amplifying levers. Both the upper and lower fixing plates are fixed L-shaped structures and are parallel to the plane containing the lateral and vertical displacement amplifying levers. A hollow guide groove is provided at the center of both the lateral and vertical displacement amplifying levers along their axial direction. A lateral limiting pin and a vertical limiting pin, vertically and fixedly connected to the upper and lower fixing plates, respectively pass through the lateral displacement amplifying lever. Within the hollowed-out guide grooves of the lever and the vertical displacement amplifying lever, both the upper and lower fixed plates are also provided with corresponding horizontal and vertical guide grooves. The horizontal displacement measuring shaft passes sequentially through the horizontal guide groove of the upper fixed plate, the hollowed-out guide groove of the horizontal displacement amplifying lever, and the horizontal guide groove of the lower fixed plate. The vertical displacement measuring shaft passes sequentially through the vertical guide groove of the upper fixed plate, the hollowed-out guide groove of the vertical displacement amplifying lever, and the vertical guide groove of the lower fixed plate. The upper end of the horizontal displacement amplifying lever is hinged to the inclined cable, and the lower end is hinged to one end of the vertical displacement amplifying lever. The other end of the vertical displacement amplifying lever is freely disposed. Two laser displacement gauges are provided on the upper or lower fixed plate, which are used to measure the linear movement distance of the horizontal displacement measuring axis and the vertical displacement measuring axis, respectively.

[0009] Preferably, the stay cable is provided with a cable clamp, and the cable clamp is provided with a pair of cable clamp lugs, which are rotatably connected to the upper end of the lateral displacement amplification lever through a rotating pin.

[0010] Preferably, both the upper and lower fixing plates are fixedly installed by a base plate pre-embedded in the top surface of the main beam, and multiple stiffening ribs are provided on both sides of the lower fixing plate to increase structural stability.

[0011] Preferably, the upper and lower fixing plates are provided with multiple limiting pin holes corresponding to the positions of the lateral and vertical limiting pins, which are used to allow the lateral and vertical limiting pins to be selectively set in one of the limiting pin holes, thereby realizing the optimal arrangement of the fulcrum of the lateral displacement amplifying lever and the vertical displacement amplifying lever as needed.

[0012] Preferably, the lateral limiting pin is disposed at the upper part of the lateral displacement amplifying lever, the lateral displacement measuring shaft is disposed at the lower part of the lateral displacement amplifying lever, the vertical limiting pin is disposed close to the lateral displacement amplifying lever, and the vertical displacement measuring shaft is disposed away from the lateral displacement amplifying lever.

[0013] Preferably, the hollow guide groove of the vertical displacement amplification lever is arc-shaped.

[0014] The present invention also provides a method for measuring the multidimensional vibration displacement of a cable-stayed bridge based on a composite lever mechanism. First, the multidimensional vibration displacement of the cable-stayed bridge is amplified by a lateral displacement amplification lever and a vertical displacement amplification lever, and the amplified value is obtained. Second, by using a decoupling algorithm and combining the displacement amplification value, the lateral and vertical displacement data in the cable-stayed bridge plane are output.

[0015] Preferably, the linear movement distances of the lateral displacement measuring axis and the vertical displacement measuring axis are t1 and t0, respectively; initially, the length of the lateral displacement amplifying lever is L, the distance from the lateral limiting pin to the lateral displacement measuring axis is L1, the distance from the vertical limiting pin to the bottom of the lateral displacement amplifying lever is L2, and the distance from the vertical limiting pin to the vertical displacement measuring axis is L3; after the multidimensional vibration of the cable, the included angle of rotation of the lateral displacement amplifying lever along the lateral limiting pin is... The decoupling algorithm then outputs the transverse and vertical displacement data Δ1 and Δ0 in the cable-stayed plane, respectively, using the following calculation formulas: ; ; in, .

[0016] The present invention has at least the following beneficial effects: 1. The measuring device and method of this invention achieve physical decoupling of the dynamic displacement in the normal plane of the cable-stayed bridge through a specific mechanical structure (directional transmission mechanism + orthogonal guide groove group). This decomposes the multi-degree-of-freedom vibration (complex coupled motion) of the cable-stayed bridge in the normal plane into independent lateral and vertical components. The mechanical structure eliminates mutual interference between these directions, achieving physical separation of the cable-stayed bridge displacement in the normal plane into two independent outputs in orthogonal directions. This makes it possible to perform high-precision measurements using a unidirectional displacement measuring device. Furthermore, the amplification effect of the composite lever mechanism on the lateral and vertical displacement components of the cable-stayed bridge in the normal plane further enhances the accuracy of displacement measurement. This comprehensively simplifies the measurement process, improves the sensitivity and accuracy of lateral displacement measurement of the cable-stayed bridge, and solves the problem of insufficient sensitivity of traditional sensors in measuring small lateral displacements of cable-stayed bridges.

[0017] 2. The measuring device and method of this invention achieve real-time, high-precision measurement of the in-plane vibration displacement law of the cable-stayed bridge. The data obtained can be directly applied to the study of the vibration characteristics of the cable-stayed bridge and the design optimization of its external vibration damping device. It is used to study the vibration characteristics of the cable-stayed bridge and guide the design optimization of the external damper. It significantly improves the vibration reduction effect, especially the transverse (out-of-plane) vibration suppression effect, enhances the durability and environmental adaptability of the cable-stayed bridge, and reduces bridge maintenance costs. The non-contact measurement method combined with levers is intuitive and simple.

[0018] 3. The measuring device and method of the present invention directly separate displacement components at the physical level through mechanical design, eliminating coupling interference in advance. Compared with algorithm decoupling, it belongs to a lower-level displacement decoupling method, which greatly improves the environmental adaptability of the equipment, reduces the complexity of the equipment and economic costs.

[0019] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0020] Figure 1 This is a side view of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the overall structure of the present invention; Figure 3 This is a front view of the overall structure of the present invention; Figure 4 This is a schematic diagram illustrating the computational principle of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Cable stays, 2. Cable clamp, 3. Rotating pin, 4. Lateral displacement amplifying lever, 5. Lateral limiting pin, 6. Lateral displacement measuring shaft, 7. Vertical limiting pin, 8. Vertical displacement amplifying lever, 9. Vertical displacement measuring shaft, 10. Upper fixing plate, 11. Lower fixing plate, 12. Lateral guide groove, 13. Vertical guide groove, 14. Base plate, 15. Hollowed-out guide groove. Detailed Implementation

[0022] To better understand the purpose, structure, and function of this invention, the invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0023] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0024] like Figures 1 to 3As shown, this invention provides a multi-dimensional vibration displacement measuring device for a stay cable based on a composite lever mechanism. It includes a lateral displacement amplifying lever 4 perpendicular to the axis of the stay cable 1, a vertical displacement amplifying lever 8 forming an L-shape with the lateral displacement amplifying lever, and an upper fixing plate 10 and a lower fixing plate 11 sandwiching the lateral and vertical displacement amplifying levers. Both the upper and lower fixing plates are fixed L-shaped structures and are parallel to the plane containing the lateral and vertical displacement amplifying levers. A hollow guide groove 15 is provided at the center of both the lateral and vertical displacement amplifying levers along their axial direction (the axial direction refers to the length direction of the lateral and vertical displacement amplifying levers). A lateral limiting pin 5 and a vertical limiting pin 7 are perpendicularly and fixedly connected to the upper and lower fixing plates. The transverse displacement measuring shaft 6 is respectively installed in the hollow guide grooves of the transverse displacement amplifying lever and the vertical displacement amplifying lever. The upper and lower fixed plates are also provided with corresponding transverse guide grooves 12 and vertical guide grooves 13. The transverse displacement measuring shaft 6 passes through the transverse guide groove of the upper fixed plate, the hollow guide groove of the transverse displacement amplifying lever and the transverse guide groove of the lower fixed plate in sequence. The vertical displacement measuring shaft 9 passes through the vertical guide groove of the upper fixed plate, the hollow guide groove of the vertical displacement amplifying lever and the vertical guide groove of the lower fixed plate in sequence. The upper end of the transverse displacement amplifying lever is hinged to the inclined cable and the lower end is hinged to one end of the vertical displacement amplifying lever. The other end of the vertical displacement amplifying lever is free. Two laser displacement gauges are provided on the upper or lower fixed plate, which are used to measure the linear movement distance of the transverse displacement measuring shaft and the vertical displacement measuring shaft, respectively.

[0025] A lateral limiting pin, a vertical limiting pin, a lateral displacement amplifying lever, and a vertical displacement amplifying lever constitute a displacement decoupling mechanism. The lateral displacement amplifying lever and the vertical displacement amplifying lever are connected by a hinged force transmission component to achieve synchronous amplification and mechanical decoupling of lateral bridge displacement and in-plane vertical displacement.

[0026] Cable clamps 2 are installed on the stay cables. One end of the lateral displacement amplifying lever is rotatably connected to the cable clamp via a rotating pin 3, and the other end is connected to the vertical displacement amplifying lever via a hinged force transmission component. If a pin hinge connection is used, hollow guide grooves for lateral and vertical limit pins are provided in the middle of both the lateral and vertical displacement amplifying levers to achieve a rotatable connection between the displacement amplifying lever and the limit pins, forming a fulcrum. The limit pins do not affect the movement of the displacement amplifying lever. Both the upper and lower fixed plates are L-shaped to match the lateral and vertical displacement amplifying levers. Multiple limit pin holes arranged axially along the fixed plate are provided at corresponding positions on the upper end for installing the corresponding limit pins. A lateral guide groove is provided in the middle of the fixed plate (left-right direction in the figure), and a vertical guide groove is provided at the other end of the fixed plate (up-down direction in the figure).

[0027] During measurement, the displacement amplification lever is located between the upper and lower fixed plates, and the three are rotatably connected by a lateral limiting pin and a vertical limiting pin. The lateral displacement measuring shaft passes through the lateral guide groove of the upper fixed plate, the hollow guide groove (vertical) of the lateral displacement amplification lever, and the lateral guide groove of the lower fixed plate from top to bottom. The vertical displacement measuring shaft passes through the vertical guide groove of the upper fixed plate, the hollow guide groove (lateral) of the vertical displacement amplification lever, and the vertical guide groove of the lower fixed plate from top to bottom.

[0028] When the stay cable undergoes any directional displacement, the lateral displacement amplifying lever will simultaneously move vertically and rotate around the lateral limiting pin. The lateral displacement measuring axis relative to the fixed plate undergoes lateral displacement, reflecting the lateral displacement component of the stay cable; the vertical displacement measuring axis relative to the fixed plate undergoes vertical displacement, reflecting the vertical displacement component of the stay cable. The vertical displacement amplifying lever will simultaneously move horizontally and rotate around the vertical limiting pin. Real-time and accurate measurement of the lateral and vertical displacement measuring axes is achieved by integrating a non-contact laser displacement meter on the fixed plate. The measurement data is transmitted to a wireless router via network cable, and then remotely transmitted and uploaded to a cloud-based data acquisition system for storage, analysis, and display. The laser displacement meter and other equipment can use any power supply mode, such as solar panels. For example, a monocrystalline silicon solar panel can be installed on the side of the lower fixed plate, and a matching battery can be installed on the bottom of the lower fixed plate. Lead-acid batteries are a good option due to their low cost and stable performance. The matching battery powers the laser displacement meter.

[0029] In another technical solution, the stay cable is provided with a cable clamp, and the cable clamp is provided with a pair of cable clamp lugs, which are rotatably connected to the upper end of the lateral displacement amplification lever through a rotating pin.

[0030] In another technical solution, both the upper and lower fixing plates are fixedly installed via a base plate 14 pre-embedded in the top surface of the main beam. The lower fixing plate has multiple stiffening ribs on both sides to increase structural stability. The upper and lower fixing plates are fixedly connected to the base plate, which is in turn fixedly connected to the bridge deck. Two stiffening ribs are provided vertically on both sides of the lower fixing plate to ensure structural stability during operation.

[0031] In another technical solution, the upper and lower fixed plates are provided with multiple limiting pin holes corresponding to the positions of the lateral and vertical limiting pins, which are used to selectively set the lateral and vertical limiting pins in one of the limiting pin holes, thereby realizing the optimal arrangement of the fulcrum of the lateral displacement amplifying lever and the vertical displacement amplifying lever as needed.

[0032] A lateral limiting pin is bolted to the lower fixed plate. The position of the lateral limiting pin on the lower fixed plate is adjustable through different positions of its lateral limiting pin hole, thereby achieving the optimal arrangement of the fulcrum of the lateral displacement amplifying lever as needed. A vertical limiting pin is bolted to the lower fixed plate. The position of the vertical limiting pin on the lower fixed plate is adjustable through different positions of its vertical limiting pin hole, thereby achieving the optimal arrangement of the fulcrum of the vertical displacement amplifying lever as needed. The positions of the lateral and vertical limiting pins (fulcrums) of the lateral and vertical displacement amplifying levers are adjustable to accommodate the lateral and vertical displacement amplification requirements of different cable diameters.

[0033] In another technical solution, the lateral limiting pin is disposed at the upper part of the lateral displacement amplifying lever, the lateral displacement measuring shaft is disposed at the lower part of the lateral displacement amplifying lever, the vertical limiting pin is disposed close to the lateral displacement amplifying lever, and the vertical displacement measuring shaft is disposed away from the lateral displacement amplifying lever.

[0034] In another technical solution, the hollow guide groove of the vertical displacement amplification lever is arc-shaped to facilitate the smooth realization of displacement amplification and conversion.

[0035] This invention also provides a method for measuring the multidimensional vibration displacement of a stay cable based on a composite lever mechanism. First, the multidimensional vibration displacement of the stay cable is amplified using a lateral displacement amplification lever and a vertical displacement amplification lever, and the amplified values ​​are obtained. Second, using a decoupling algorithm, combined with the amplified displacement values, the displacement data of the stay cable in the lateral and vertical directions within the normal plane are output. By setting the differentiated amplification ratio of the lateral and vertical displacement amplification levers, and combining the decoupling algorithm of the displacement coupling mechanism, the displacement data of the stay cable in two individual directions (lateral and vertical directions within the normal plane) are output.

[0036] like Figure 4 As shown in the figure, the simplified working principle of this invention is as follows: Initially, the length AE of the lateral displacement amplifying lever is L, the distance OA from the lateral limiting pin to the top of the lateral displacement amplifying lever is L0, the distance OB from the lateral limiting pin to the lateral displacement measuring axis is L1, the distance CE from the vertical limiting pin to the bottom of the lateral displacement amplifying lever is L2, and the distance CF from the vertical limiting pin to the vertical displacement measuring axis is L3; after vibration, the included angle of rotation of the lateral displacement amplifying lever along the lateral limiting pin is... The linear movement distances BD and FG of the measured transverse and vertical displacement axes are t1 and t0, respectively; the actual transverse and vertical displacement data in the cable-stayed bridge plane are Δ1 and Δ0, respectively. The relationship between the actual displacement data and the measured data can be obtained as shown in equations (1), (2), and (3): Based on the relationships shown in the diagram, we can conclude that: ; ; ; According to the principle of similar triangles: ; Right now ; again ; By combining the two equations, we can obtain: (1) (2) (3).

[0037] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention, and other modifications can be easily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A multi-dimensional vibration displacement measuring device for a stay cable based on a compound lever mechanism, characterized by, The system includes a lateral displacement amplifying lever perpendicular to the cable axis, a vertical displacement amplifying lever forming an L-shape with the lateral displacement amplifying lever, and an upper fixing plate and a lower fixing plate sandwiching the lateral and vertical displacement amplifying levers within it. Both the upper and lower fixing plates are fixed L-shaped structures and are parallel to the plane containing the lateral and vertical displacement amplifying levers. Each of the lateral and vertical displacement amplifying levers has a hollow guide groove at its midpoint along its axial direction. A lateral limiting pin and a vertical limiting pin, vertically and fixedly connected to the upper and lower fixing plates, pass precisely within the hollow guide grooves of the lateral and vertical displacement amplifying levers, respectively. Both the upper and lower fixed plates are provided with corresponding horizontal and vertical guide grooves. The horizontal displacement measuring shaft passes through the horizontal guide groove of the upper fixed plate, the hollow guide groove of the horizontal displacement amplifying lever, and the horizontal guide groove of the lower fixed plate in sequence. The vertical displacement measuring shaft passes through the vertical guide groove of the upper fixed plate, the hollow guide groove of the vertical displacement amplifying lever, and the vertical guide groove of the lower fixed plate in sequence. The upper end of the horizontal displacement amplifying lever is hinged to the cable, and the lower end is hinged to one end of the vertical displacement amplifying lever. The other end of the vertical displacement amplifying lever is free. Two laser displacement gauges are provided on the upper or lower fixed plate, which are used to measure the linear movement distance of the horizontal displacement measuring shaft and the vertical displacement measuring shaft, respectively.

2. The multi-dimensional vibration displacement measurement device of the cable based on the compound lever mechanism according to claim 1, wherein, The cable is equipped with a cable clamp, and the cable clamp is equipped with a pair of cable clamp lugs, which are rotatably connected to the upper end of the lateral displacement amplification lever through a rotating pin.

3. The multi-dimensional vibration displacement measuring device for cable-stayed bridges based on a composite lever mechanism as described in claim 1, characterized in that, Both the upper and lower fixing plates are fixed by a base plate pre-embedded in the top surface of the main beam. The lower fixing plate has multiple stiffening ribs on both sides to increase structural stability.

4. The multi-dimensional vibration displacement measuring device for cable-stayed bridges based on a composite lever mechanism as described in claim 1, characterized in that, The upper and lower fixing plates are each provided with multiple limiting pin holes corresponding to the positions of the lateral and vertical limiting pins. These holes allow the lateral and vertical limiting pins to be selectively placed in one of the limiting pin holes, thereby achieving the optimal arrangement of the fulcrums of the lateral and vertical displacement amplifying levers as needed.

5. The multi-dimensional vibration displacement measuring device for cable-stayed bridges based on a composite lever mechanism as described in claim 1, characterized in that, The lateral limiting pin is located at the upper part of the lateral displacement amplifying lever, the lateral displacement measuring shaft is located at the lower part of the lateral displacement amplifying lever, the vertical limiting pin is located close to the lateral displacement amplifying lever, and the vertical displacement measuring shaft is located away from the lateral displacement amplifying lever.

6. The multi-dimensional vibration displacement measuring device for cable-stayed bridges based on a composite lever mechanism as described in claim 1, characterized in that, The hollow guide groove of the vertical displacement amplification lever is arc-shaped.

7. The method for measuring the multidimensional vibration displacement of a stay cable based on a composite lever mechanism as described in any one of claims 1 to 6, characterized in that, First, the multidimensional vibration displacement of the cable-stayed bridge is amplified by using lateral and vertical displacement amplification levers, and the amplified value is obtained. Second, by using a decoupling algorithm and combining the displacement amplification value, the transverse and vertical displacement data in the cable-stayed bridge plane are output.

8. The method for measuring the multidimensional vibration displacement of a stay cable based on a composite lever mechanism as described in claim 7, characterized in that, The linear movement distances of the lateral displacement measuring axis and the vertical displacement measuring axis are obtained as t1 and t0, respectively. Initially, the length of the lateral displacement amplifying lever is L, the distance from the lateral limiting pin to the lateral displacement measuring axis is L1, the distance from the vertical limiting pin to the bottom of the lateral displacement amplifying lever is L2, and the distance from the vertical limiting pin to the vertical displacement measuring axis is L3. After the cable-stayed cable undergoes multidimensional vibration, the included angle of rotation of the lateral displacement amplifying lever along the lateral limiting pin is... The decoupling algorithm then outputs the transverse and vertical displacement data Δ1 and Δ0 in the cable-stayed plane, respectively, using the following calculation formulas: ； ； in, .

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