Damping device

Abstract

The application relates to a damping device, which comprises a cable hoop assembly, a support assembly, a damping assembly and a monitoring assembly; the cable hoop assembly is used for fixing the damping assembly to the outer side of a stay cable in a cable-stayed bridge; the first end surface of the support assembly is fixed to the bridge deck of the cable-stayed bridge, the second end surface of the support assembly is arranged in close contact with the damping assembly, the second end surface of the support assembly and the damping assembly are mutually rubbed in a first direction when the stay cable vibrates to a preset degree; the first direction is perpendicular to the length direction of the stay cable; the damping assembly is used for generating a variable electric signal in the process of mutual rubbing with the second end surface of the support assembly; the monitoring assembly is electrically connected with the damping assembly and is used for monitoring the health condition of the damping assembly based on the electrical parameters of the variable electric signal. The application is monitored through the variable electric signal generated by the damping assembly itself, sensors do not need to be arranged in each damping assembly, the cost is reduced, and the self-sensing capability of the damping device is improved.

Description

Technical Field

[0001] This application relates to the field of vibration reduction technology, and in particular to a vibration reduction device. Background Technology

[0002] Structural vibration reduction is a key focus of disaster prevention and mitigation in civil engineering. Damping components offer advantages such as good vibration reduction performance, cost-effectiveness, and ease of installation, making them widely recognized as the most direct and effective cable-stayed bridge vibration reduction method. Based on their operating characteristics and damping materials, damping components are classified into viscous damping components, high-damping rubber damping components, magnetorheological damping components, and friction damping components. Among these, friction damping components, due to their simple construction and stable performance, are widely used in the construction of numerous cable-stayed bridges both domestically and internationally.

[0003] In practical engineering, to ensure a relatively stable working environment, friction damping components require external enclosures such as helmets to seal them, making their operation a "black box." With the widespread application of bridge monitoring systems in recent years, monitoring the vibration state of stay cables and the operating status of friction damping components necessitates deploying numerous sensors on the cables, resulting in high costs. Summary of the Invention

[0004] Therefore, it is necessary to provide a vibration reduction device to address the issue of how to achieve low-cost monitoring of the operation of friction damping components.

[0005] In a first aspect, this application provides a vibration damping device, which includes a cable clamp assembly, a support assembly, a damping assembly, and a monitoring assembly;

[0006] The cable clamp assembly is used to fix the damping assembly to the outside of the stay cable in the cable-stayed bridge;

[0007] The first end face of the support assembly is fixed to the bridge deck of the cable-stayed bridge, and the second end face of the support assembly is fitted with the damping assembly. When the cable-stayed cable vibrates to a predetermined degree, the second end face of the support assembly rubs against the damping assembly in a first direction; the first direction is perpendicular to the length direction of the cable-stayed cable.

[0008] The damping component is used to generate a variable electrical signal during the process of friction with the second end face of the support assembly;

[0009] The monitoring component is electrically connected to the damping component and is used to monitor the health status of the damping component based on the electrical parameters of the variable electrical signal.

[0010] In one embodiment, the monitoring component includes an acquisition module and a signal analysis module;

[0011] The acquisition module is electrically connected to the damping component and is used to acquire the electrical parameters of the variable electrical signal in real time and transmit the electrical parameters to the signal analysis module.

[0012] The signal analysis module is connected to the acquisition module and is used to monitor the health status of the damping component based on the electrical parameters of the variable electrical signal.

[0013] In one embodiment, the signal analysis module is further configured to obtain friction information of the damping component based on the changing trend of the electrical parameters of the variable electrical signal, and monitor the health status of the damping component based on the friction information.

[0014] In one embodiment,

[0015] The electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is further used to determine that the friction information of the damping component is an increase in friction time history when the absolute values ​​of the open-circuit voltage, the short-circuit current, and the transferred charge all show an increasing trend, and when the increase in the absolute value of the open-circuit voltage is less than the increase in the absolute values ​​of the short-circuit current and the transferred charge.

[0016] In one embodiment, the electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is further configured to determine that the friction information of the damping component is an increase in frictional force when the absolute values ​​of the open-circuit voltage, the short-circuit current, and the transferred charge all show an increasing trend, and the increase in the absolute value of the open-circuit voltage is greater than the increase in the absolute values ​​of the short-circuit current and the transferred charge.

[0017] In one embodiment, the signal analysis module is further configured to obtain the vibration information of the cable-stayed bridge based on the changing trend of the electrical parameters of the variable electrical signal, and monitor the health status of the damping component based on the vibration information.

[0018] In one embodiment, the electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is further configured to determine that the vibration information of the cable-stayed cable is an increase in vibration frequency when the absolute values ​​of the open-circuit voltage and the short-circuit current show an increasing trend and the change in the absolute value of the transferred charge is less than a preset value.

[0019] In one embodiment, the acquisition module includes an electrode plate and a signal acquisition element;

[0020] The electrode plate is electrically connected to the damping assembly and the signal acquisition element respectively, and is used to transmit the variable electrical signal to the signal acquisition element so that the signal acquisition element can acquire the electrical parameters of the variable electrical signal;

[0021] The signal acquisition element is connected to the signal analysis module and is used to transmit the electrical parameters of the electrical signal to the signal analysis module.

[0022] In one embodiment, the electrode plate includes a first polar electrode plate and a second polar electrode plate, the first polar electrode plate and the second polar electrode plate being spaced apart along the first direction;

[0023] Both the first polar electrode plate and the second polar electrode plate are electrically connected to the damping component and the signal acquisition element to form a conductive path between the signal acquisition element and the damping component, so that the signal acquisition element can acquire the electrical parameters of the variable electrical signal of the damping component through the conductive path.

[0024] In one embodiment, the damping assembly includes a first friction plate and a second friction plate, the first friction plate and the second friction plate being spaced apart along the first direction, the first friction plate being electrically connected to the first polar electrode plate, and the second friction plate being electrically connected to the second polar electrode plate.

[0025] When the stay cable vibrates to a predetermined degree, the support assembly rubs back and forth between the first friction plate and the second friction plate to generate variable charge on the first friction plate and the second friction plate.

[0026] The first polarity electrode plate and the second polarity electrode plate transmit the variable charge to the signal acquisition element in the form of the variable electrical signal.

[0027] In one embodiment, the electrode plate is fixed between the support assembly and the damping assembly by conductive adhesive.

[0028] In one embodiment, the bracket assembly includes a friction bolt, a first movable member, a second movable member, and a fixing member;

[0029] The friction bolt is fixed to the first end of the first movable part and is used to fit against the damping component, and to rub against the damping component in the first direction when the cable vibrates to a predetermined degree.

[0030] The second end of the first movable member is movably connected to the first end of the second movable member, and is used to translate in the first direction under the action of the friction force generated by the friction between the friction bolt and the damping assembly;

[0031] The second end of the second movable member is fixed to the first support part of the fixed member, and the movable end of the second movable member is movably connected to the second support part of the fixed member. The second movable member is used to translate in a second direction through the movable end under the action of the friction force generated by the friction between the friction bolt and the damping assembly; the second direction is perpendicular to the first direction.

[0032] The first support portion of the fastener is fixed to the bridge deck of the cable-stayed bridge, and the first support portion and the second support portion extend in two mutually perpendicular directions to jointly support the second movable component.

[0033] In one embodiment, the second end of the first movable member is movably connected to the first end of the second movable member by a first sliding bolt; the movable end of the second movable member is movably connected to the second support portion of the fixed member by a second sliding bolt.

[0034] The first sliding bolt and the second sliding bolt are used to attach and fix the first friction surface of the friction bolt to the second friction surface of the damping component when assembling the bracket assembly; the first friction surface and the second friction surface are the two surfaces of the damping component and the friction bolt that rub against each other in the first direction.

[0035] In one embodiment, the first end of the second movable member is provided with a first groove; the first groove is used to provide a translational track for translational movement along the first direction;

[0036] The first sliding bolt is disposed in the first sliding groove and is used to drive the first movable part to move horizontally within the first sliding groove.

[0037] In one embodiment, the second support portion is provided with a second groove and a sliding bar; the second groove is used to provide a translational track for translational movement along the second direction;

[0038] One end of the sliding bar is embedded in the second sliding groove, and the other end of the sliding bar is fixed to the movable end of the second movable member by the second sliding bolt. The sliding bar is used to drive the second movable member to move horizontally in the second sliding groove.

[0039] The aforementioned vibration damping device includes a cable clamp assembly, a support assembly, a damping assembly, and a monitoring assembly. The cable clamp assembly is used to fix the damping assembly to the outside of the stay cable in the cable-stayed bridge. The first end face of the support assembly is fixed to the bridge deck of the cable-stayed bridge, and the second end face of the support assembly is fitted with the damping assembly. When the stay cable vibrates to a predetermined degree, the second end face of the support assembly rubs against the damping assembly in a first direction. The first direction is perpendicular to the length direction of the stay cable. The damping assembly is used to generate a variable electrical signal during the process of rubbing against the second end face of the support assembly. The monitoring assembly is electrically connected to the damping assembly and is used to monitor the health status of the damping assembly based on the electrical parameters of the variable electrical signal. In this application, when the cable vibrates, the damping component and the support component rub against each other. By electrically connecting the monitoring component to the damping component, the variable electrical signal generated by the friction of the damping component is used as the health / operating status monitoring parameter of the damping component. The health status of the damping component can be monitored based on the electrical parameters of the variable electrical signal. Monitoring is carried out by the variable electrical signal generated by the damping component itself, eliminating the need to set sensors in each damping component, reducing costs and improving the self-sensing capability of the vibration reduction device. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the vibration damping device in one embodiment of this application;

[0042] Figure 2 A schematic diagram of the monitoring component in one embodiment of this application;

[0043] Figure 3 A graph showing the change in electrical parameters of a variable electrical signal corresponding to an increase in friction time history in one embodiment of this application;

[0044] Figure 4 A graph showing the change in electrical parameters of a variable electrical signal corresponding to an increase in friction in one embodiment of this application;

[0045] Figure 5 A graph showing the change in electrical parameters of a variable electrical signal corresponding to an increase in vibration frequency in one embodiment of this application;

[0046] Figure 6 A schematic diagram of the acquisition module in one embodiment of this application;

[0047] Figure 7A schematic diagram of the process of generating static electricity through friction between the first friction plate, the second friction plate, and the second end face of the bracket assembly in one embodiment of this application;

[0048] Figure 8 A cross-sectional view of a portion of the support assembly in one direction in one embodiment of this application;

[0049] Figure 9 A cross-sectional view of a portion of the support assembly in one embodiment of the application, taken in another direction;

[0050] Figure 10 A schematic diagram of the bracket assembly in a certain installation position according to an embodiment of this application.

[0051] Explanation of icon numbers:

[0052] Cable clamp assembly: 110; Support assembly: 120; Friction bolt: 121; Second end face of support assembly: 1211; First moving part: 122; Second moving part: 123; First slide groove: 1231; Fixing part: 124; First support part: 1241; Second support part: 1242; Second slide groove: 421; Sliding bar: 422; Damping assembly: 130; First friction plate: 131; Second friction plate: 132; Monitoring assembly: 140; Acquisition module: 141; Electrode plate: 1411; Signal acquisition element: 1412; Signal analysis module: 142; Stay cable: 210. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0057] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0059] With the rapid development of intelligent networks and sensor networks, providing them with sustainable and stable energy has become an urgent need. Due to the limitations of battery life, relying entirely on batteries for power is becoming increasingly impractical. Therefore, finding a new type of renewable and distributed energy source is urgently needed.

[0060] In one embodiment, see Figure 1 , Figure 1A schematic diagram of a vibration damping device according to an embodiment of this application is shown. The vibration damping device in this embodiment includes a cable clamp assembly 110, a support assembly 120, a damping assembly 130, and a monitoring assembly 140. The cable clamp assembly 110 is used to fix the damping assembly 130 to the outside of the stay cable in the cable-stayed bridge. The first end face of the support assembly 120 is fixed to the bridge deck of the cable-stayed bridge, and the second end face of the support assembly 120 is fitted with the damping assembly 130. When the stay cable vibrates to a predetermined degree, the second end face of the support assembly 120 rubs against the damping assembly 130 in a first direction. The first direction is perpendicular to the length direction of the stay cable. The damping assembly 130 is used to generate a variable electrical signal during the process of rubbing against the second end face of the support assembly 120. The monitoring assembly 140 is electrically connected to the damping assembly 130 and is used to monitor the health status of the damping assembly 130 based on the electrical parameters of the variable electrical signal.

[0061] The structure of the cable clamp assembly 110 corresponds to the outer peripheral structure of the stay cable and can wrap around the outer periphery of the stay cable. When the damping assembly 130 is fixed on the cable clamp assembly 110, the damping assembly 130, the cable clamp assembly 110 and the stay cable vibrate synchronously when the stay cable vibrates.

[0062] The second end face of the support assembly 120 is fitted to the damping assembly 130. This can be understood as the second end face of the support assembly 120 and the damping assembly 130 being connected by a pre-pressure limiting connection, applying pressure to the damping assembly 130. Therefore, when the cable undergoes slight vibration and deformation, the force applied by the damping assembly 130 to the support assembly 120 is insufficient to overcome the static friction force provided by the pressure applied by the second end face of the support assembly 120 to the damping assembly 130. At this time, the damping assembly 130 and the second end face of the support assembly 120 will not rub against each other. Only when the cable undergoes large-amplitude vibration, that is, when its vibration level reaches a preset level, will the damping assembly 130 rub against the second end face of the support assembly 120 to reduce the vibration of the cable. This limits the working conditions of the damping assembly 130 and improves its durability.

[0063] Compared to installing vibration damping devices on towers or at the connection points between cables and the bridge deck, while this can alleviate some vibration, its control efficiency for high-frequency vibrations is lower due to the distance from the main source of cable vibration. In this embodiment, the vibration damping device can be directly fixed to the bridge deck via the support assembly 120. This allows it to dissipate some energy before the vibration propagates to the cables. The vibration damping device fixed to the bridge deck transfers some of the cable vibration energy to the bridge deck structure, creating a synergistic vibration damping effect between the bridge deck and the cables. This disperses the force caused by vibration, so the cables themselves do not need to bear the entire vibration load alone, thereby extending the cable life and reducing maintenance costs.

[0064] The damping component 130 can be a component capable of converting mechanical energy into electrical energy through the coupling effect of triboelectricity and electrostatic induction. Exemplarily, it can be a component including a TENG friction plate (a material based on triboelectric nanogenerator (TENG) technology), which is characterized by its simple structure, light weight, low cost, and diverse material selection. Under the action of triboelectric effect, charge separation occurs on the surface of the TENG friction plate. This charge separation forms an electric field inside the TENG friction plate, thereby driving electron flow and generating an electrical signal output.

[0065] When the stay cable vibrates to a predetermined degree, the cable clamp assembly 110 fixed to it vibrates accordingly, and the damping assembly 130 fixedly connected to the cable clamp assembly 110 also vibrates. Under the action of friction, the second end face of the support assembly 120 moves relative to the damping assembly 130 in the first direction, thereby generating friction. Through the friction between the damping assembly 130 and the support assembly 120, part of the kinetic energy can be converted into heat energy, while another part of the kinetic energy can be converted into electrical energy, maximizing the consumption of cable vibration energy and reducing its vibration amplitude. By recording and analyzing the electrical parameters of the variable electrical signal through the monitoring assembly 140, real-time monitoring of the shock absorber can be achieved, thereby improving the stability and safety of the bridge.

[0066] In this embodiment, when the stay cable vibrates to a predetermined degree, the damping component 130 and the support component 120 rub against each other. The monitoring component 140 is electrically connected to the damping component 130, and the variable electrical signal generated by the friction of the damping component 130 is used as the health / working status monitoring parameter of the damping component 130. The health status of the damping component 130 can be monitored based on the electrical parameters of the variable electrical signal. Monitoring is carried out by the variable electrical signal generated by the damping component 130 itself, eliminating the need to set sensors in each damping component 130, reducing costs and improving the self-sensing capability of the vibration reduction device.

[0067] In one embodiment, see Appendix Figure 2 , attached Figure 2 A schematic diagram of the structure of 140 in one embodiment of this application is shown. In this embodiment, 140 includes an acquisition module 141 and a signal analysis module 142. The acquisition module 141 is electrically connected to the damping component 130 and is used to acquire the electrical parameters of the variable electrical signal in real time and transmit the electrical parameters to the signal analysis module 142. The signal analysis module 142 is connected to the acquisition module 141 and is used to monitor the health status of the damping component 130 based on the electrical parameters of the variable electrical signal.

[0068] The electrical parameters of the variable electrical signal can refer to open-circuit voltage, short-circuit current, and transferred charge. When the electrical parameters of the variable electrical signal change, it means that the health status of the damping component 130 also changes accordingly. By analyzing the changes in the electrical parameters of the variable electrical signal, the health status of the damping component 130 can be obtained, and real-time monitoring of the health status of the damping component 130 can be achieved.

[0069] In one embodiment, the signal analysis module is further configured to obtain friction information of the damping component based on the changing trend of the electrical parameters of the variable electrical signal, and monitor the health status of the damping component based on the friction information.

[0070] The health status of the damping component can be reflected by friction information. Friction information can be obtained by the changing trend of the electrical parameters of the variable electrical signal. Furthermore, the health status of the damping component can be detected by the correspondence between the known friction information and the health status.

[0071] The working performance (i.e., health status) of the damper is closely related to its friction information (such as friction time history and friction force). During initial installation, the damping component's parameters are adjusted to achieve the predetermined working performance, at which point corresponding initial friction information (such as initial friction time history and initial friction force) is available. As the damping component's working time increases, its working performance (health status) degrades. Variable electrical signals can be used to analyze the changes in the damping component's friction information over the working time in a timely and accurate manner, thereby calculating the difference from the initial friction information and predicting the degradation of the damping component's working performance (health status). When the damping component's working performance (health status) degrades to a certain threshold, a rapid judgment can be made to replace the damping component. Therefore, the health status of the damping component can be detected based on the known correspondence between friction information and health status.

[0072] Since the initial voltage, current and charge are different under various conditions such as different bridges and different ambient temperatures and humidity, this application exemplifies the example with an ambient temperature of 29°C and an ambient humidity of 36%.

[0073] In one embodiment, the electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is also used to determine that the friction information of the damping component is an increase in friction time history when the absolute values ​​of open-circuit voltage, short-circuit current, and transferred charge all show an increasing trend and the increase in the absolute value of open-circuit voltage is less than the increase in the absolute values ​​of short-circuit current and transferred charge.

[0074] For example, see Appendix Figure 3 , attached Figure 3 This is a graph showing the change in electrical parameters of the variable electrical signal corresponding to the increase in friction time history; with appended... Figure 3 Figure (a) shows the open-circuit voltage V. oc The change curve is shown in the attached figure. Figure 3 Figure (b) shows the short-circuit current I. sc The change curve is shown in the attached figure. Figure 3 Figure (c) shows the transferred charge Q. oc The change curve is shown in the attached figure. Figure 3 Figure (d) shows the fitted curve of friction time history versus open-circuit voltage. As the friction time history of the damping component increases, the open-circuit voltage V at the second end face of the damping component and the support component during the friction process... oc Short-circuit current I sc With the transfer charge Q oc The absolute values ​​of all show an increasing trend. Open circuit voltage (attached) Figure 3 The sum of the absolute values ​​of the positive and negative voltages shown in diagram (a) increases from 0.32V at ±2mm to 1.95V at ±10mm. Short-circuit current (see attached diagram) Figure 3 (b) The sum of the absolute values ​​of the positive and negative currents shown in the diagram) sc The charge transfer increased from 4.98 nA at ±2 mm to 25.01 nA at ±10 mm. (See attached diagram) Figure 3 (c) The sum of the absolute values ​​of the positive and negative charges shown in the diagram) Q oc The temperature increased from 0.98 μC at ±2 mm to 0.78 μC at ±10 mm. And according to... Figure 3 As shown in Figure (d), with the increase of the friction time history, the open-circuit voltage V of the damping component decreases. oc Approximately linear increase, coefficient of determination R 2 The value is 0.9845. Therefore, when determining the friction information of the damping component as an increase in the friction time history, the open-circuit voltage V can also be considered. oc Whether the increase is approximately linear can be judged, specifically by defining the open-circuit voltage V of the damping component through the magnitude of the coefficient of determination. oc Does it meet the requirement of approximate linearity? That is, the signal analysis module in this embodiment is also used to determine that the friction information of the damping component is an increase in friction time history when the open-circuit voltage, short-circuit current and transferred charge all show an increasing trend, and the determination coefficient of the increase function of the open-circuit voltage is greater than a preset value and the increase in the absolute value of the open-circuit voltage is less than the increase in the absolute values ​​of the short-circuit current and transferred charge.

[0075] In one embodiment, the electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is also used to determine that the friction information of the damping component is an increase in frictional force when the absolute values ​​of open-circuit voltage, short-circuit current, and transferred charge all show an increasing trend, and the increase in the absolute value of open-circuit voltage is greater than the increase in the absolute values ​​of short-circuit current and transferred charge.

[0076] For example, see Appendix Figure 4 , attached Figure 4 The graph shows the change in electrical parameters of the variable electrical signal corresponding to an increase in friction. Figure 4 Figure (a) shows the open-circuit voltage V. oc The change curve, Figure 4 Figure (b) shows the short-circuit current I. sc The change curve, Figure 4 Figure (c) shows the transferred charge Q. oc The curve shows the change in voltage V between the damping component and the support component during the friction process, as the frictional force increases. oc Short-circuit current I sc With the transfer charge Q oc All show an increasing trend. Open-circuit voltage V oc ( Figure 4 The sum of the absolute values ​​of the positive and negative voltages shown in diagram (a) increases from 0.96V at 500N to 3.15V at 2000N. Short-circuit current I sc Figure 4 The sum of the absolute values ​​of the positive and negative currents shown in diagram (a) increases from 12.89 nA at 500 N to 24.24 nA at 2000 N. The transferred charge Q oc Figure 4 The sum of the absolute values ​​of the positive and negative charges shown in (c) increases from 0.042 μC at 500 N to 0.162 μC at 2000 N.

[0077] In one embodiment, the signal analysis module is also used to obtain the vibration information of the cable-stayed bridge based on the changing trend of the electrical parameters of the variable electrical signal, and to monitor the health status of the damping components based on the vibration information.

[0078] In particular, when the vibration frequency of the stay cable is too high, it may also have an adverse effect on the health status of the damping component. Therefore, by acquiring the vibration information of the stay cable, the health status of the damping component can be monitored from another angle that may affect the health status of the stay cable, so as to monitor the health status of the damping component more comprehensively.

[0079] In one embodiment, the electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is also used to determine that the vibration information of the cable-stayed cable is an increase in vibration frequency when the absolute values ​​of the open-circuit voltage and the short-circuit current show an increasing trend and the change in the absolute value of the transferred charge is less than a preset value.

[0080] See appendix Figure 5 , attached Figure 5 The graph shows the change in electrical parameters of the variable electrical signal as the vibration frequency increases. Figure 5 This indicates that the open-circuit voltage V between the second end faces of the damping component and the support component during the friction process occurs within the oscillation frequency range of 2Hz-10Hz. oc Short-circuit current I sc The absolute value of Q shows an increasing trend, indicating that the transferred charge Q oc The absolute value of did not change significantly. Open-circuit voltage V oc ( Figure 5 (a) shows the sum of the absolute values ​​of the positive and negative voltages increasing from 0.38V at 2Hz to 0.98V at 10Hz. Short-circuit current I sc ( Figure 5 (b) shows the sum of the absolute values ​​of the positive and negative currents, increasing from 25.78 nA at 2 Hz to 128.48 nA at 10 Hz. The transferred charge Q oc ( Figure 5 (b) shows that the sum of the absolute values ​​of positive and negative charges does not show a significant increasing trend at 0.181 nC. Figure 5 Figure (d) shows that as the friction frequency increases, the open-circuit voltage V of the damping component... oc Similarly approximating a linear increase, the linear fitting function is V. oc =0.204x-0.072, where x is the loading frequency and R0 is the coefficient of determination of the linear fitting function. 2 The value is 0.9845. That is, the signal analysis module in this embodiment can determine that the vibration information of the stay cable is an increase in vibration frequency when the absolute values ​​of the open-circuit voltage and short-circuit current show an increasing trend, and the change in the absolute value of the transferred charge is less than a preset value. It can also determine that the vibration information of the stay cable is an increase in vibration frequency when the open-circuit voltage and short-circuit current show an increasing trend, the change in transferred charge is less than a preset value, and the coefficient of determination of the increase function of the open-circuit voltage is greater than a preset value. The coefficient of determination of the increase function of the open-circuit voltage being greater than a preset value is used to determine whether the open-circuit voltage meets the preset approximate linear increase condition.

[0081] In one embodiment, see Appendix Figure 6 Appendix Figure 6 The schematic diagram of the acquisition module 141 in this embodiment is shown below. The acquisition module 141 in this embodiment includes an electrode plate 1411 and a signal acquisition element 1412. The electrode plate 1411 is electrically connected to the damping component 130 and the signal acquisition element 1412 respectively, and is used to transmit the variable electrical signal to the signal acquisition element 1412 so that the signal acquisition element 1412 can acquire the electrical parameters of the variable electrical signal. The signal acquisition element 1412 is connected to the signal analysis module 142 and is used to transmit the electrical parameters of the electrical signal to the signal analysis module 142.

[0082] In this embodiment, the electrode plate 1411 can be any conductive metal material, such as copper or aluminum sheets, and is not limited thereto. The electrode plate 1411, in conjunction with the structure of the damping assembly 130, exports the variable electrical signal generated by the damping assembly 130 to the signal acquisition element 1412. The signal acquisition element 1412 can be any detection element, such as voltage detection, current detection, charge detection, etc., and is not limited thereto. The signal analysis module 142 can be any processor module capable of data processing and signal analysis. The signal acquisition element 1412 acquires the electrical parameters of the variable electrical signal, and then performs parameter analysis through the signal analysis module 142. This allows for the monitoring of the health status of the damping assembly 130 using the variable electrical signal generated by the damping assembly 130 itself, reducing monitoring costs while simultaneously achieving vibration reduction and improving real-time monitoring efficiency.

[0083] In one embodiment, the electrode plate includes a first polarity electrode plate and a second polarity electrode plate, which are spaced apart along a first direction. Both the first polarity electrode plate and the second polarity electrode plate are electrically connected to the damping component and the signal acquisition element to form a conductive path between the signal acquisition element and the damping component, so that the signal acquisition element can acquire the electrical parameters of the variable electrical signal of the damping component through the conductive path.

[0084] In this embodiment, the first polarity electrode plate and the second polarity electrode plate can be a positive electrode plate and a negative electrode plate, respectively. The first polarity electrode plate and the second polarity electrode plate are electrically connected to the signal acquisition element through positive and negative electrode wires, thereby forming a conductive path. Through this conductive path, the electrical parameters of the variable electrical signal of the damping component can be acquired in real time and efficiently.

[0085] In one embodiment, the damping assembly includes a first friction plate 131 and a second friction plate 132, which are spaced apart along a first direction. The first friction plate 131 is electrically connected to a first polar electrode plate, and the second friction plate 132 is electrically connected to a second polar electrode plate. When the cable vibrates to a predetermined degree, the support assembly rubs back and forth between the first friction plate 131 and the second friction plate 132 to generate variable charges. The first and second polar electrode plates transmit the variable charges to a signal acquisition element in the form of variable electrical signals.

[0086] The first friction plate 131 and the second friction plate 132 are spaced apart and can be bonded together with insulating adhesive, so that the second end face 1211 of the support assembly can slide between the mutually insulated first friction plate 131 and second friction plate 132 as the cable vibrates, thereby generating a variable electrical signal. Both the first friction plate 131 and the second friction plate 132 can be TENG friction plates.

[0087] For details, please refer to the appendix. Figure 7 Appendix Figure 7 A schematic diagram illustrating the process of static electricity generation through friction between the first friction plate 131, the second friction plate 132, and the second end face 1211 of the support assembly is shown. If the cable is not vibrating, as... Figure 7 As shown in (a), the second end face 1211 of the support assembly is completely attached to the surface of the first friction plate 131. There is only a pressing force perpendicular to the contact surface between them, and no frictional force horizontal to the contact surface. Due to the principle of electrostatic induction, the first electrode electrically connected to the first friction plate 131 will induce an equal amount of opposite charge. The second friction plate 132, since it is not in contact with the second end face 1211 of the support assembly, does not have any induced charge. At this time, the potential difference between the two sets of electrodes is at its maximum. When the cable-stayed cable vibrates to a predetermined degree, such as... Figure 7 As shown in (b), when the second end face 1211 of the support assembly slides from the first friction plate 131 to the second friction plate 132, the induced charge on the first friction plate 131 decreases due to the reduced contact area with the second end face 1211 of the support assembly, while the induced charge on the second friction plate 132 begins to increase as it comes into contact with the second end face 1211 of the support assembly. At this time, the potential of the first electrode gradually decreases, and the potential of the second electrode gradually increases. Under the action of friction, when the potentials of the two sets of electrodes are equal, the potential difference between the two electrodes is 0. As the second end face 1211 of the support assembly moves, when the second end face 1211 of the support assembly is completely in contact with the second friction plate 132, as... Figure 7 As shown in (c), the second electrode will induce an equal amount of opposite charges, at which point the potential difference between the two sets of electrodes reaches its maximum value in the opposite direction. Afterwards, the second end face 1211 of the support assembly continues to slide, and a portion of the second end face 1211 of the support assembly re-adheres to the first friction plate 131, as shown... Figure 7 As shown in (d), equal and opposite charges are induced. The induced charge of the second friction plate 132 gradually decreases, while the induced charge of the first friction plate 131 gradually increases. When the induced charges of the two sets of electrodes are equal, the potential difference between the two electrodes will return to zero. The second end face 1211 of the support assembly continues to move until it is completely in contact with the second friction plate 132, at which point one working cycle is completed.

[0088] When the damping component is working, the second end face 1211 of the support component continuously rubs against the first friction plate 131 and the second friction plate 132. The above-mentioned periodic process will repeat, and at this time, a variable electrical signal is generated periodically, and the frictional kinetic energy is gradually converted into heat energy and dissipated.

[0089] Within one cycle, the electrical parameters of the variable electrical signal generated by friction can be acquired in real time by the signal acquisition element, and the electrical parameters of the variable electrical signal within one cycle are stored. At the same time, the signal analysis module can determine the magnitude changes of factors affecting the electrical parameters of the variable electrical signal, such as the frictional force, friction time history, and vibration frequency, by analyzing the changing trends of the electrical parameters of the variable electrical signal in adjacent cycles, thereby realizing real-time monitoring of the health status of the damping component.

[0090] In one embodiment, the electrode plate is fixed between the support assembly and the damping assembly by conductive adhesive.

[0091] In one embodiment, see Appendix Figures 8-10 , Figure 8 A sectional view of part of the support assembly in one direction is shown, attached. Figure 9 A cross-sectional view of part of the support assembly in this embodiment from another direction is attached. Figure 10 This is a schematic diagram of the support assembly in a certain installation position according to this embodiment. The support assembly in this embodiment includes a friction bolt 121, a first movable member 122, a second movable member 123, and a fixing member 124; the friction bolt 121 is fixed to the first end of the first movable member 122 for fitting against the damping component 130, and rubs against the damping component 130 in a first direction when the stay cable 210 vibrates to a predetermined degree; the second end of the first movable member 122 is movably connected to the first end of the second movable member 123, for translating in the first direction under the action of the friction force generated by the friction between the friction bolt 121 and the damping component 130; the second movable member 123... The second end is fixed to the first support portion 1241 of the fixing member 124, and the movable end of the second movable member 123 is movably connected to the second support portion 1242 of the fixing member 124. The second movable member 123 is used to translate in a second direction through its movable end under the action of the friction force generated by the friction between the friction bolt 121 and the damping assembly 130. The second direction is perpendicular to the first direction. The first support portion 1241 of the fixing member 124 is fixed to the bridge deck of the cable-stayed bridge, and the first support portion 1241 and the second support portion 1242 extend in two mutually perpendicular directions to jointly support the second movable member 123.

[0092] Among them, the friction surface of the friction bolt 121 serves as the second end face of the bracket assembly. The friction surface of the friction bolt 121 is made of materials with strong electronegativity and high temperature resistance, such as polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), polyimide (Kopton), polyethylene terephthalate (PTE), chloroprene rubber (CR), polyacrylonitrile (PAN), polybisphenol A (PC), and polydimethylsiloxane (PDMS).

[0093] In this embodiment, the first support portion 1241 of the fixing member 124 is fixed to the bridge deck of the cable-stayed bridge to ensure that the position of the entire support assembly on the bridge deck remains unchanged. The first movable plate can move along the first direction and the second movable plate can move along the second direction, thereby ensuring that when the cable 210 deforms in the first and second directions, it can drive the friction bolt 121 to rub against the damping assembly 130 in the first direction.

[0094] In one embodiment, there may be two first movable plates, each with two friction bolts fixed to its first end. Correspondingly, four damping components are fixed in the cable clamp assembly. The second ends of both first movable plates are slidably connected to the first ends of the second movable plate, clamping the first ends of the second movable plate between them. The cable clamp assembly with the damping components is fixedly connected between the two first movable plates. The friction surfaces of the friction bolts fixed on the two first movable plates are in close contact with the damping components, forming two sets of friction connectors working together to minimize the vibration of the stay cable while enhancing the variable electrical signal and improving the sensitivity of monitoring the health status of the damping components.

[0095] In one embodiment, the second end of the first movable member is movably connected to the first end of the second movable member by a first sliding bolt; the movable end of the second movable member is movably connected to the second support portion of the fixed member by a second sliding bolt; the first sliding bolt and the second sliding bolt are used to fit and fix the first friction surface of the friction bolt to the second friction surface of the damping assembly when assembling the bracket assembly; the first friction surface and the second friction surface are two surfaces of the damping assembly and the friction bolt that rub against each other in a first direction.

[0096] In this embodiment, the movable end of the second movable member is bolted to the second support portion of the fixed member by a second sliding bolt. The second sliding bolt can translate along a second direction, thereby driving the second movable member to translate parallel to the cable direction (i.e., the second direction). The first movable member and the second movable plate are bolted to each other by a first sliding bolt. The first sliding bolt can translate along a first direction, thereby driving the second movable plate to translate perpendicular to the cable direction (i.e., the first direction). During installation, the positions of the first and second movable members can be adjusted by loosening the first and second sliding bolts until the first friction surface of the friction bolt is completely attached to the second friction surface of the damping assembly. Then, the bolts are tightened to ensure that the damping assembly only works when the cable vibrates to a preset degree.

[0097] In one embodiment, see Appendix Figure 8 The first end of the second movable member 123 is provided with a first slide groove 1231; the first slide groove 1231 is used to provide a translational track for translational movement along the first direction; wherein, the first sliding bolt is provided in the first slide groove 1231 and is used to drive the first movable member 122 to translate within the first slide groove 1231.

[0098] In one embodiment, see Appendix Figure 8 The second support 1242 is provided with a second slide groove 421 and a sliding bar 422; the second slide groove 421 is used to provide a translational track for translational movement along the second direction; one end of the sliding bar 422 is embedded in the second slide groove 421, and the other end of the sliding bar 422 is fixed to the movable end of the second movable member 123 by a second sliding bolt; the sliding bar 422 is used to drive the second movable member 123 to translate in the second slide groove 421.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A vibration damping device characterized by comprising: The vibration reduction device includes a cable clamp assembly, a support assembly, a damping assembly, and a monitoring assembly; The cable clamp assembly is used to fix the damping assembly to the outside of the stay cable in the cable-stayed bridge; The first end face of the support assembly is fixed to the bridge deck of the cable-stayed bridge, and the second end face of the support assembly is fitted with the damping assembly. When the cable-stayed cable vibrates to a predetermined degree, the second end face of the support assembly rubs against the damping assembly in a first direction; the first direction is perpendicular to the length direction of the cable-stayed cable. The damping component is used to generate a variable electrical signal during the process of friction with the second end face of the support assembly; The monitoring component is electrically connected to the damping component and is used to monitor the health status of the damping component based on the electrical parameters of the variable electrical signal. The monitoring component includes a data acquisition module, which is electrically connected to the damping component and is used to acquire the electrical parameters of the variable electrical signal in real time. The acquisition module includes an electrode plate and a signal acquisition element; The electrode plate is electrically connected to the damping assembly and the signal acquisition element respectively, and is used to transmit the variable electrical signal to the signal acquisition element so that the signal acquisition element can acquire the electrical parameters of the variable electrical signal; The electrode plate includes a first polar electrode plate and a second polar electrode plate, which are spaced apart along the first direction. Both the first polar electrode plate and the second polar electrode plate are electrically connected to the damping component and the signal acquisition element to form a conductive path between the signal acquisition element and the damping component, so that the signal acquisition element can acquire the electrical parameters of the variable electrical signal of the damping component through the conductive path.

2. The vibration damping device according to claim 1, characterized by The monitoring components also include a signal analysis module; The signal analysis module is connected to the acquisition module and is used to monitor the health status of the damping component based on the electrical parameters of the variable electrical signal.

3. The vibration damping device according to claim 2, characterized by The signal analysis module is also used to obtain the friction information of the damping component based on the changing trend of the electrical parameters of the variable electrical signal, and to monitor the health status of the damping component based on the friction information.

4. The vibration damping device according to claim 3, characterized by The electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is further used to determine that the friction information of the damping component is an increase in friction time history when the absolute values ​​of the open-circuit voltage, the short-circuit current, and the transferred charge all show an increasing trend, and when the increase in the absolute value of the open-circuit voltage is less than the increase in the absolute values ​​of the short-circuit current and the transferred charge.

5. The vibration damping device according to claim 3, characterized by The electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is further used to determine that the friction information of the damping component is an increase in frictional force when the absolute values ​​of the open-circuit voltage, the short-circuit current, and the transferred charge all show an increasing trend, and the increase in the absolute value of the open-circuit voltage is greater than the increase in the absolute values ​​of the short-circuit current and the transferred charge.

6. The vibration damping device according to claim 2, characterized by The signal analysis module is also used to obtain the vibration information of the cable-stayed bridge based on the changing trend of the electrical parameters of the variable electrical signal, and to monitor the health status of the damping component based on the vibration information.

7. The vibration damping device according to claim 6, characterized by The electrical parameters of the variable electrical signal include open-circuit voltage, short-circuit current, and transferred charge; the signal analysis module is also used to determine that the vibration information of the cable-stayed cable is an increase in vibration frequency when the absolute values ​​of the open-circuit voltage and the short-circuit current show an increasing trend and the change in the absolute value of the transferred charge is less than a preset value.

8. The vibration damping device according to claim 2, characterized in that, The signal acquisition element is connected to the signal analysis module and is used to transmit the electrical parameters of the electrical signal to the signal analysis module.

9. The vibration damping device according to claim 8, characterized by The damping assembly includes a first friction plate and a second friction plate, which are spaced apart along the first direction. The first friction plate is electrically connected to the first polar electrode plate, and the second friction plate is electrically connected to the second polar electrode plate. When the stay cable vibrates to a predetermined degree, the support assembly rubs back and forth between the first friction plate and the second friction plate to generate variable charge on the first friction plate and the second friction plate. The first polarity electrode plate and the second polarity electrode plate transmit the variable charge to the signal acquisition element in the form of the variable electrical signal.

10. Damping device according to any one of claims 8 to 9, characterized in that The electrode plate is fixed between the support assembly and the damping assembly using conductive adhesive.

11. The vibration damping device of claim 1, wherein The bracket assembly includes a friction bolt, a first movable component, a second movable component, and a fixing component; The friction bolt is fixed to the first end of the first movable part and is used to fit against the damping component, and to rub against the damping component in the first direction when the cable vibrates to a predetermined degree. The second end of the first movable member is movably connected to the first end of the second movable member, and is used to translate in the first direction under the action of the friction force generated by the friction between the friction bolt and the damping assembly; The second end of the second movable member is fixed to the first support part of the fixed member, and the movable end of the second movable member is movably connected to the second support part of the fixed member. The second movable member is used to translate in a second direction through the movable end under the action of the friction force generated by the friction between the friction bolt and the damping assembly; the second direction is perpendicular to the first direction. The first support portion of the fastener is fixed to the bridge deck of the cable-stayed bridge, and the first support portion and the second support portion extend in two mutually perpendicular directions to jointly support the second movable component.

12. The vibration damping device according to claim 11, characterized by The second end of the first movable component is movably connected to the first end of the second movable component via a first sliding bolt; the movable end of the second movable component is movably connected to the second support portion of the fixed component via a second sliding bolt. The first sliding bolt and the second sliding bolt are used to attach and fix the first friction surface of the friction bolt to the second friction surface of the damping component when assembling the bracket assembly; the first friction surface and the second friction surface are the two surfaces of the damping component and the friction bolt that rub against each other in the first direction.

13. The vibration damping device of claim 12, wherein The first end of the second movable component is provided with a first slide groove; the first slide groove is used to provide a translational track for translational movement along the first direction; The first sliding bolt is disposed in the first sliding groove and is used to drive the first movable part to move horizontally within the first sliding groove.

14. The vibration damping device of claim 12, wherein The second support portion is provided with a second slide groove and a sliding bar; the second slide groove is used to provide a translational track for translational movement along the second direction; One end of the sliding bar is embedded in the second sliding groove, and the other end of the sliding bar is fixed to the movable end of the second movable member by the second sliding bolt. The sliding bar is used to drive the second movable member to move horizontally in the second sliding groove.

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