Damper device

Abstract

The invention relates to a vibration reduction 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 the cable-stayed bridge. The first end face of the support assembly is fixed to the bridge floor of the cable-stayed bridge, the second end face of the support assembly is attached to the damping assembly, and the second end face of the support assembly rubs with the damping assembly in the 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 friction with the second end face of the support assembly. The monitoring assembly is electrically connected with the damping assembly and used for monitoring the health condition of the damping assembly based on the electrical parameters of the variable electrical signals. Monitoring is carried out through the variable electric signals generated by the damping assemblies, a sensor does not need to be arranged in each damping assembly, cost is reduced, and the self-sensing capacity of the damping device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vibration reduction, and in particular to a vibration reduction device. Background Art

[0002] Structural vibration reduction is one of the key focuses of civil engineering disaster prevention and reduction. Damping component vibration reduction measures have the advantages of good vibration reduction performance, relatively economical, and easy installation, so they are recognized as the most direct and effective cable vibration reduction measures. According to the working characteristics and vibration reduction materials of the damping components, the damping components are divided into viscous damping components, high damping rubber damping components, magnetorheological damping components, friction damping components and other types. Among them, the friction damping component has been widely used in the construction of many cable-stayed bridges at home and abroad because of its simple structure and stable working performance.

[0003] In actual engineering, in order to ensure a relatively stable working environment, the friction damping assembly needs to be enclosed by a hood or other device on the outside, and the working state of the friction damping assembly becomes a "black box". With the widespread application of bridge monitoring systems in recent years, in order to monitor the vibration state of the cable and the working state of the friction damping assembly, a large number of sensors need to be laid on the cable, which is costly. Summary of the invention

[0004] Based on this, it is necessary to provide a vibration reduction device to solve the problem of how to realize the working monitoring of the friction damping component at a low cost.

[0005] In a first aspect, the present application provides a vibration reduction device, the vibration reduction device comprising a cable clamp assembly, a bracket assembly, a damping assembly and a monitoring assembly;

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

[0007] The first end surface of the bracket assembly is fixed to the bridge deck of the cable-stayed bridge, the second end surface of the bracket assembly is arranged in close contact with the damping assembly, and the second end surface of the bracket assembly rubs against the damping assembly in a first direction when the inclined cable vibrates to a preset degree; the first direction is perpendicular to the length direction of the inclined cable;

[0008] The damping component is used to generate a variable electrical signal during the friction between the damping component and the second end surface of the bracket component;

[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 of the embodiments, the signal analysis module is further used to obtain friction information of the damping component according to a change trend of the electrical parameter 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 transfer charge; the signal analysis module is also used to determine that the friction information of the damping component is an increase in friction time when the absolute values ​​of the open circuit voltage, the short circuit current and the transfer charge all show an increasing trend and the increase in the absolute value of the open circuit voltage is less than the increase in the absolute value of the short circuit current and the transfer charge.

[0016] In one embodiment, the electrical parameters of the variable electrical signal include open circuit voltage, short circuit current and transfer charge; the signal analysis module is also used to determine that the friction information of the damping component is an increase in friction when the absolute values ​​of the open circuit voltage, the short circuit current and the transfer 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 value of the short circuit current and the transfer charge.

[0017] In one of the embodiments, the signal analysis module is further used to obtain vibration information of the cable according to a change trend of an electrical parameter of the variable electrical signal, and to monitor a health status of the damping component based on the vibration information.

[0018] In one of the embodiments, the electrical parameters of the variable electrical signal include open circuit voltage, short circuit current and transfer charge; the signal analysis module is also used to determine that the vibration information of the 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 transfer charge is less than a preset value.

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

[0020] The electrode plates are electrically connected to the damping assembly and the signal acquisition element respectively, and are used to transmit the variable electrical signal to the signal acquisition element so that the signal acquisition element acquires 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 polarity electrode plate and a second polarity electrode plate, and the first polarity electrode plate and the second polarity electrode plate are spaced apart along the first direction;

[0023] The first polarity electrode plate and the second polarity electrode plate are both 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 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 are spaced apart along the first direction, the first friction plate is electrically connected to the first polarity electrode plate, and the second friction plate is electrically connected to the second polarity electrode plate;

[0025] Wherein, when the inclined cable vibrates to a preset degree, the bracket assembly rubs back and forth between the first friction plate and the second friction plate, so that the first friction plate and the second friction plate generate variable charges;

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

[0027] In one of the embodiments, the electrode plate is fixed between the bracket assembly and the damping assembly by conductive glue.

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

[0029] The friction bolt is fixed to the first end of the first movable member, and is used to be arranged in close contact with the damping assembly, and to rub against the damping assembly in the first direction when the inclined cable vibrates to a preset 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 for translational movement 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 supporting portion of the fixed member, the movable end of the second movable member is movably connected to the second supporting portion of the fixed member, and 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 supporting portion of the fixing member is fixed to the bridge deck of the cable-stayed bridge, and the first supporting portion and the second supporting portion extend in two mutually perpendicular directions respectively, for jointly supporting the second movable member.

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

[0034] 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 the first direction.

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

[0036] Wherein, the first sliding bolt is arranged in the first sliding groove, and is used for driving the first movable member to move in translation in the first sliding groove.

[0037] In one embodiment, the second support portion is provided with a second slide groove and a slide bar; the second slide groove is used to provide a translation track for translation 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 through the second sliding bolt. The sliding bar is used to drive the second movable member to move in translation in the second sliding groove.

[0039] The above-mentioned vibration reduction device includes a cable clamp assembly, a bracket assembly, a damping assembly and a monitoring assembly; the cable clamp assembly is used to fix the damping assembly to the outside of the cable in the cable-stayed bridge; the first end face of the bracket assembly is fixed to the bridge deck of the cable-stayed bridge, the second end face of the bracket assembly is arranged in contact with the damping assembly, and the second end face of the bracket assembly rubs against the damping assembly in a first direction when the cable vibrates to a preset degree; the first direction is perpendicular to the length direction of the cable; the damping assembly is used to generate a variable electrical signal during the process of rubbing against the second end face of the bracket 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 the present application, when the inclined cable vibrates, the damping assembly and the support assembly rub against each other. The monitoring assembly is electrically connected to the damping assembly, and the variable electrical signal generated by the friction of the damping assembly is used as a health status / working status monitoring parameter of the damping assembly. The health status of the damping assembly can be monitored based on the electrical parameters of the variable electrical signal. The variable electrical signal generated by the damping assembly itself is used for monitoring, and there is no need to set a sensor in each damping assembly, which reduces costs and improves the self-sensing ability of the vibration reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a structural schematic diagram of a vibration reduction device in one embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of a monitoring component in an embodiment of the present application;

[0043] Figure 3 A curve diagram of electrical parameter changes of a variable electrical signal corresponding to an increase in friction time in an embodiment of the present application;

[0044] Figure 4 A curve diagram of electrical parameter changes of a variable electrical signal corresponding to an increase in friction force in an embodiment of the present application;

[0045] Figure 5 A curve diagram of electrical parameter changes of a variable electrical signal corresponding to an increase in vibration frequency in an embodiment of the present application;

[0046] Figure 6 A schematic diagram of the structure of a collection module in an embodiment of the present application;

[0047] Figure 7A schematic diagram of the process of frictional electricity generation between the first friction plate, the second friction plate and the second end surface of the bracket assembly in one embodiment of the present application;

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

[0049] Fig. 9 A cross-sectional view of a portion of a bracket assembly in one embodiment of the application in another direction;

[0050] Fig.10 A schematic diagram of a bracket assembly in an embodiment of the present application in a certain installation position.

[0051] Description of Figure Numbers:

[0052] Cable clamp assembly: 110; bracket assembly: 120; friction bolt: 121; second end face of the bracket assembly: 1211; first movable member: 122; second movable member: 123; first slide groove: 1231; fixing member: 124; first support portion: 1241; second support portion: 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; inclined cable: 210. DETAILED DESCRIPTION

[0053] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0059] With the rapid development of smart networks and sensor networks, how to provide them with sustainable and stable energy has become an urgent need. Due to the limitation of battery life, it is becoming increasingly impractical to be powered entirely by batteries. Therefore, it is urgent to find a new type of renewable and distributed energy.

[0060] In one embodiment, see Figure 1 , Figure 1A schematic structural diagram of a vibration reduction device in an embodiment of the present application is shown, and the vibration reduction device in this embodiment includes a cable clamp assembly 110, a bracket 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 cable in the cable-stayed bridge; the first end face of the bracket assembly 120 is fixed to the bridge deck of the cable-stayed bridge, and the second end face of the bracket assembly 120 is arranged in contact with the damping assembly 130, and the second end face of the bracket assembly 120 rubs against the damping assembly 130 in a first direction when the cable vibrates to a preset degree; the first direction is perpendicular to the length direction of the 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 bracket 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] Among them, the structure of the cable clamp assembly 110 corresponds to the outer peripheral structure of the inclined cable, and can wrap the outer periphery of the inclined cable. When the damping assembly 130 is fixed on the cable clamp assembly 110, when the inclined cable vibrates, the damping assembly 130, the cable clamp assembly 110 and the inclined cable vibrate synchronously.

[0062] The second end face of the bracket assembly 120 is fitted with the damping assembly 130. It can be understood that the second end face of the bracket assembly 120 is connected to the damping assembly 130 through a pre-pressure limit, and pressure is applied to the damping assembly 130. Therefore, when the inclined cable vibrates slightly and deforms, the force applied by the damping assembly 130 to the bracket assembly 120 is insufficient to overcome the static friction provided by the pressure applied by the second end face of the bracket assembly 120 to the damping assembly 130. At this time, the damping assembly 130 and the second end face of the bracket assembly 120 will not rub against each other. Only when the inclined cable vibrates significantly, that is, its vibration level reaches a preset level, the damping assembly 130 will rub against the second end face of the bracket assembly 120 to reduce the vibration of the inclined cable, limit the working conditions of the damping assembly 130, and improve the durability of the damping assembly 130.

[0063] Compared with installing the vibration reduction device on the connection point between the tower column or the cable and the bridge deck, although it can alleviate some vibrations, its control efficiency for high-frequency vibrations is low due to its distance from the main source of the vibration of the cable. The vibration reduction device in this embodiment can be directly fixed on the bridge deck through the bracket assembly 120, which can dissipate part of the energy before the vibration is transmitted to the cable. The vibration reduction device fixed on the bridge deck transfers part of the vibration energy of the cable to the bridge deck structure, forming a synergistic vibration reduction effect between the bridge deck and the cable. It can disperse the force caused by vibration, so that the cable itself does not need to bear all the vibration gravity alone, thereby extending the life of the cable and reducing maintenance costs.

[0064] Among them, the damping component 130 can be a component that can convert mechanical energy into electrical energy through the coupling of triboelectricity and electrostatic induction. For example, it can be a component including a TENG friction plate (a material based on triboelectric nanogenerator (TENG) technology), which has the characteristics of simple structure, light weight, low cost, and diverse material selection. Under the action of the triboelectric effect, charge separation will occur on the surface of the TENG friction plate, and this charge separation will form an electric field inside the TENG friction plate, thereby driving the flow of electrons and generating an electrical signal output.

[0065] When the cable-stayed cable vibrates to a preset degree, the cable clamp assembly 110 fixed thereto vibrates accordingly, and the damping assembly 130 fixedly connected to the cable clamp assembly 110 also vibrates accordingly. Under the action of friction, the second end surface of the bracket assembly 120 moves relative to the damping assembly 130 in the first direction, thereby generating friction. The friction between the damping assembly 130 and the bracket assembly 120 can convert part of the kinetic energy into heat energy while converting another part of the kinetic energy into electrical energy, thereby maximizing the consumption of the cable vibration energy and reducing its vibration amplitude. The monitoring assembly 140 records and analyzes the electrical parameters of the variable electrical signal, thereby realizing real-time monitoring of the shock absorber and improving the stability and safety of the bridge.

[0066] In this embodiment, when the inclined cable vibrates to a preset 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 a health status / 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. The variable electrical signal generated by the damping component 130 itself is used for monitoring. There is no need to set a sensor in each damping component 130, which reduces costs and improves the self-sensing ability of the vibration reduction device.

[0067] In one embodiment, see the attached Figure 2 , attached Figure 2 The schematic diagram of the structure of 140 in one embodiment of the present application is shown, and 140 in this embodiment includes a collection module 141 and a signal analysis module 142. The collection module 141 is electrically connected to the damping component 130, and is used to collect 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 collection module 141, and is used to monitor the health of the damping component 130 based on the electrical parameters of the variable electrical signal.

[0068] Among them, the electrical parameters of the variable electrical signal may refer to open circuit voltage, short circuit current, transfer charge, etc. When the electrical parameters of the variable electrical signal change, it means that the health status of the damping component 130 also changes accordingly. The health status of the damping component 130 can be obtained by analyzing the changes in the electrical parameters of the variable electrical signal, thereby realizing real-time monitoring of the health status of the damping component 130.

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

[0070] Among them, the health status of the damping component can be reflected by friction information. The friction information is obtained through the change trend of the electrical parameters of the variable electrical signal. The health status of the damping component can be further detected based on the corresponding relationship between the known friction information and the health status.

[0071] Among them, the working performance (i.e. health status) of the damper is closely related to its friction information (such as friction time and friction force). When it is first installed, the parameters of the damping component are adjusted to achieve the predetermined working performance. At this time, there is corresponding initial friction information (such as initial friction time and initial friction force). As the working time of the damping component increases, the working performance (health status) of the damping component will degrade. The variable electrical signal can timely and accurately analyze the changes in the friction information of the damping component during the working time, and then calculate the difference with the initial friction information, and make an estimate of the degradation of the working performance (health status) of the damping component. When the working performance (health status) of the damping component degrades to a certain threshold, a judgment can be made quickly to replace the damping component. Therefore, the health status of the damping component can be detected based on the corresponding relationship between the known friction information and the health status.

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

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

[0074] For example, see the attached Figure 3 , attached Figure 3 The electrical parameter change curve of the variable electrical signal corresponding to the increase of friction time; Figure 3 Figure (a) shows the open circuit voltage V oc The change curve of Figure 3 Figure (b) shows the short-circuit current I sc The change curve of Figure 3 Figure (c) shows the transferred charge Q oc The change curve of Figure 3 Figure (d) is the fitting curve of friction time and open circuit voltage. As the friction time of the damping component increases, the open circuit voltage V of the second end surface of the damping component and the bracket component during the friction process increases. oc , short circuit current I sc With the transfer charge Q oc The absolute values ​​of the open circuit voltage (see Appendix Figure 3 The sum of the absolute values ​​of the positive and negative voltages shown in (a) of the figure increases from 0.32V at ±2mm to 1.95V at ±10mm. Figure 3 (b) shows the sum of the absolute values ​​of the positive current and the negative current) I sc The transfer charge (with Figure 3 (c) The sum of the absolute values ​​of the positive and negative charges shown in the figure) Q oc It increases from 0.98μC at ±2mm to 0.78μC at ±10mm. Figure 3 As shown in Figure (d), as the friction time increases, the open circuit voltage V oc Approximately linear increase, the determination coefficient R 2 is 0.9845. Therefore, when determining that the friction information of the damping component is the increase in friction time, the open circuit voltage V oc Whether it increases linearly or not can be judged. Specifically, the open circuit voltage V of the damping component can be determined by the size of the determination coefficient. oc Whether the requirement of approximate linearity is met. That is, the signal analysis module in this embodiment is also used to determine that the friction information of the damping component is a friction time increase when the open circuit voltage, short circuit current and transfer 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 value of the short circuit current and the transfer charge.

[0075] In one embodiment, the electrical parameters of the variable electrical signal include open circuit voltage, short circuit current and transfer charge; the signal analysis module is also used to determine that the friction information of the damping component is an increase in friction when the absolute values ​​of the open circuit voltage, short circuit current and transfer 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 transfer charge.

[0076] For example, see the attached Figure 4 , attached Figure 4 is a curve diagram of the change in electrical parameters of the variable electrical signal corresponding to the increase in friction force, where Figure 4 Figure (a) shows the open circuit voltage V oc The change curve diagram of Figure 4 Figure (b) shows the short-circuit current I sc The change curve diagram of Figure 4 Figure (c) shows the transferred charge Q oc As the friction force increases, the open circuit voltage V of the damping component and the second end surface of the bracket component during the friction process oc , short circuit current I sc With the transfer charge Q oc Both 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 (a) in the figure increases from 0.96V at 500N to 3.15V at 2000N. The short-circuit current I sc Figure 4 The absolute value of the positive current and the negative current shown in (a) increases from 12.89nA at 500N to 24.24nA at 2000N. oc Figure 4 (c) shows that the sum of the absolute values ​​of the positive and negative charges increases from 0.042 μC at 500 N to 0.162 μC at 2000 N.

[0077] In one embodiment, the signal analysis module is further used to obtain vibration information of the cable according to the variation trend of the electrical parameters of the variable electrical signal, and monitor the health status of the damping component based on the vibration information.

[0078] Among them, when the vibration frequency of the inclined cable is too large, it may also have an adverse effect on the health status of the damping component. Therefore, in this embodiment, by obtaining the vibration information of the inclined cable, the health status of the damping component can be monitored from another perspective that may affect the health status of the inclined cable, and the health status of the damping component can be monitored more comprehensively.

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

[0080] See attached Figure 5 , attached Figure 5 The graph of the electrical parameter change of the variable electrical signal corresponding to the increase of the vibration frequency is shown in the figure below. Figure 5 It shows that when the oscillation frequency is in the range of 2Hz-10Hz, the open circuit voltage V of the second end surface of the damping component and the bracket component during the friction process oc , short circuit current I sc The absolute value of the transfer charge Q oc The absolute value of the open circuit voltage V oc ( Figure 5 (a) shows that the sum of the absolute values ​​of the positive voltage and the negative voltage) increases from 0.38V at 2Hz to 0.98V at 10Hz. The short-circuit current I sc ( Figure 5 (b) shows that the absolute value of the positive current and the negative current (the sum of the absolute values) increases from 25.78 nA at 2 Hz to 128.48 nA at 10 Hz. oc ( Figure 5 (b) shows that the sum of the absolute values ​​of positive and negative charges) has no obvious increase trend at 0.181 nC. Figure 5 Figure (d) shows that as the friction frequency increases, the open circuit voltage V oc It is also close to linear increase, and the linear fitting function is V oc =0.204x-0.072, where x is the loading frequency, and the determination coefficient of the linear fitting function is R 2 is 0.9845. That is, the signal analysis module in this embodiment can determine that the vibration information of the inclined cable is an increase in vibration frequency by the absolute values ​​of the open circuit voltage and the short circuit current showing an increasing trend and the change in the absolute value of the transferred charge being less than the preset value. It can also be determined that the vibration information of the inclined cable is an increase in vibration frequency by the open circuit voltage and the short circuit current showing an increasing trend, the change in the transferred charge being less than the preset value and the determination coefficient of the increase function of the open circuit voltage being greater than the preset value. The determination coefficient of the increase function of the open circuit voltage being greater than the preset value is used to define whether the open circuit voltage meets the preset approximate linear increase condition.

[0081] In one embodiment, see the attached Figure 6 Attached Figure 6 The schematic diagram of the structure of the acquisition module 141 in the present embodiment is shown. The acquisition module 141 in the present embodiment includes an electrode plate 1411 and a signal acquisition element 1412; the electrode plate 1411 is electrically connected to the damping assembly 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 collects 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 plate, such as a copper sheet, an aluminum sheet, etc., but not limited thereto. The electrode plate 1411 cooperates with the structure of the damping component 130 to export the variable electrical signal generated by the damping component 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., but not limited thereto. The signal analysis module 142 can be any processor module that can perform functions such as data calculation and signal analysis. The signal acquisition element 1412 collects the electrical parameters of the variable electrical signal, and then performs parameter analysis through the signal analysis module 142, so that the variable electrical signal generated by the damping component 130 itself can be used to realize the health status monitoring of the damping component 130, thereby reducing the monitoring cost while satisfying vibration reduction and improving the real-time monitoring efficiency.

[0083] In one embodiment, the electrode plate includes a first polarity electrode plate and a second polarity electrode plate, and the first polarity electrode plate and the second polarity electrode plate are arranged at intervals along a first direction; the first polarity electrode plate and the second polarity electrode plate are both 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 collect 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, respectively, to form a conductive path, through which the electrical parameters of the variable electrical signal of the damping component can be collected in real time and efficiently.

[0085] In one embodiment, the damping assembly includes a first friction plate 131 and a second friction plate 132, the first friction plate 131 and the second friction plate 132 are arranged at intervals along a first direction, the first friction plate 131 is electrically connected to the first polarity electrode plate, and the second friction plate 132 is electrically connected to the second polarity electrode plate; wherein, when the inclined cable vibrates to a preset degree, the bracket assembly rubs back and forth between the first friction plate 131 and the second friction plate 132, so that the first friction plate 131 and the second friction plate 132 generate variable charges; the first polarity electrode plate and the second polarity electrode plate transmit the variable charges to the signal acquisition element in the form of variable electrical signals.

[0086] The first friction plate 131 and the second friction plate 132 are arranged at intervals, and the first friction plate 131 and the second friction plate 132 can be bonded by insulating glue, so that the second end surface 1211 of the bracket assembly can slide between the mutually insulated first friction plate 131 and the second friction plate 132 as the inclined cable vibrates, thereby generating a variable electrical signal. The first friction plate 131 and the second friction plate 132 can both be TENG friction plates.

[0087] For details, see the attached Figure 7 Attached Figure 7 The schematic diagram of the process of frictional electricity generation between the first friction plate 131, the second friction plate 132 and the second end surface 1211 of the bracket assembly is shown. If the cable does not vibrate, Figure 7 As shown in (a), the second end face 1211 of the bracket assembly is completely attached to the surface of the first friction plate 131. There is only a squeezing force perpendicular to the contact surface between the two, and no friction 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 equal amounts of opposite charges, while the second friction plate 132 does not contact the second end face 1211 of the bracket assembly, so there is no induced charge. At this time, the potential difference between the two groups of electrodes is the largest. When the inclined cable vibrates to a preset degree, such as Figure 7 As shown in (b), when the second end face 1211 of the bracket 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 decrease in the contact area with the second end face 1211 of the bracket assembly, while the induced charge on the second friction plate 132 begins to increase due to the contact with the second end face 1211 of the bracket 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 groups of electrodes are equal, the potential difference between the two electrodes is 0. With the movement of the second end face 1211 of the bracket assembly, when the second end face 1211 of the bracket assembly is completely in contact with the second friction plate 132, as shown in FIG. Figure 7 As shown in (c) in FIG. 1 , the second electrode will induce equal amounts of opposite charges, and the potential difference between the two sets of electrodes reaches the reverse maximum value. After that, the second end surface 1211 of the bracket assembly continues to slide, and a portion of the second end surface 1211 of the bracket assembly is again attached to the first friction plate 131, as shown in FIG. Figure 7 As shown in (d), equal amounts of opposite charges are induced, the induced charge of the second friction plate 132 will gradually decrease, and the induced charge of the first friction plate 131 will gradually increase. When the induced charges of the two groups of electrodes are equal, the potential difference between the two electrodes will reach 0 again. The second end surface 1211 of the bracket assembly continues to move until it is completely attached to the second friction plate 132, and a working cycle is completed.

[0088] When the damping assembly is working, the second end surface 1211 of the bracket assembly continuously rubs against the first friction plate 131 and the second friction plate 132, and the above periodic process will be repeated. At this time, a variable electrical signal is periodically generated, and the friction kinetic energy is gradually converted into heat energy and dissipated.

[0089] In one cycle, the electrical parameters of the variable electrical signal generated by friction can be collected in real time by the signal acquisition element, and the electrical parameters of the variable electrical signal in one cycle can be stored. At the same time, the signal analysis module can determine the magnitude changes of the friction force, friction time course, vibration frequency and other factors affecting the electrical parameters of the variable electrical signal on the damping component by analyzing the change trend 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 glue.

[0091] In one embodiment, see the attached Figure 8~Figure 10 , Figure 8 A cross-sectional view of a portion of the bracket assembly in one direction is shown. Fig. 9 A cross-sectional view of a portion of the bracket assembly in another direction in this embodiment is shown in FIG. Fig.10 The schematic diagram of the bracket assembly in this embodiment at a certain installation position is shown. The bracket 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, and is used to be arranged in a close fit with the damping member 130, and to rub against the damping member 130 in a first direction when the inclined cable 210 vibrates to a preset degree; the second end of the first movable member 122 is movably connected to the first end of the second movable member 123, and is used to move in a straight line in the first direction under the action of the friction force generated by the friction between the friction bolt 121 and the damping member 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 move in a second direction through the movable end under the action of the friction force generated by the mutual 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 respectively in two mutually perpendicular directions for jointly supporting the second movable member 123.

[0092] Among them, the friction surface of the friction bolt 121 serves as the second end surface of the bracket assembly, and the material of the friction surface of the friction bolt 121 is a material 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), polycarbonate bisphenol (PC), polydimethylsiloxane (PDMS), etc.

[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 bracket assembly on the bridge deck remains unchanged, the first movable plate can translate in the first direction, and the second movable plate can translate in the second direction, thereby ensuring that when the cable 210 is deformed in the first direction and the second direction, the friction bolt 121 and the damping assembly 130 can be driven to rub against each other in the first direction.

[0094] In one embodiment, the number of the first movable plates can be two, and the first ends of the two first movable plates are respectively fixed with two friction bolts. At this time, correspondingly, four damping assemblies are fixed in the cable clamp assembly. The second ends of the two first movable plates are slidably connected to the first end of the second movable plate, and the second ends of the two first movable plates clamp the first end of the second movable plate. The cable clamp assembly fixedly connected with the damping assembly is located between the two first movable plates. The friction surfaces of the friction bolts fixed on the two first movable plates are tightly fitted with the damping assembly, forming two groups of friction connectors working together, which can minimize the vibration of the inclined cable while enhancing the variable electrical signal and improving the sensitivity of monitoring the health status of the damping assembly.

[0095] In one embodiment, the second end of the first movable member is movably connected to the first end of the second movable member via a first sliding bolt; the movable end of the second movable member is movably connected to the second supporting portion of the fixed member via 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 that rub against each other between the damping assembly and the friction bolt in the first direction.

[0096] In this embodiment, the movable end of the second movable member is bolted to the second supporting portion of the fixed member through a second sliding bolt, wherein the second sliding bolt can translate in the second direction to drive the second movable member to translate in a direction parallel to the inclined cable (i.e., the second direction), and the first movable member is bolted to the second movable plate through a first sliding bolt, wherein the first sliding bolt can translate in the first direction to drive the second movable plate to translate in a direction perpendicular to the cable (i.e., the first direction). During installation, the positions of the first movable member and the second movable member can be adjusted by simply loosening the first sliding bolt and the second sliding bolt, and the bolts are tightened until the first friction surface of the friction bolt is completely attached to the second friction surface of the damping assembly, ensuring that the damping assembly works only when the inclined cable vibrates to a preset degree.

[0097] In one embodiment, continue to refer to the attached Figure 8 A first slide groove 1231 is provided at the first end of the second movable member 123; the first slide groove 1231 is used to provide a translation track for translation 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 in the first slide groove 1231.

[0098] In one embodiment, continue to refer to the attached Figure 8 The second support portion 1242 is provided with a second slide groove 421 and a sliding bar 422; the second slide groove 421 is used to provide a translation track that moves in 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, and the sliding bar 422 is used to drive the second movable member 123 to move in the second slide groove 421.

[0099] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the application. It should be noted that, for a person of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A vibration reduction device, characterized in that: The vibration reduction device includes a cable clamp assembly, a bracket assembly, a damping assembly and a monitoring assembly; The cable clamp assembly is used to fix the damping assembly to the outer side of the cable in the cable-stayed bridge; The first end surface of the bracket assembly is fixed to the bridge deck of the cable-stayed bridge, the second end surface of the bracket assembly is arranged in close contact with the damping assembly, and the second end surface of the bracket assembly rubs against the damping assembly in a first direction when the inclined cable vibrates to a preset degree; the first direction is perpendicular to the length direction of the inclined cable; The damping component is used to generate a variable electrical signal during the friction between the damping component and the second end surface of the bracket component; 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.

2. The vibration reduction device according to claim 1, characterized in that: The monitoring components include an acquisition module and a signal analysis module; 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; 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 reduction device according to claim 2, characterized in that: The signal analysis module is further used to obtain friction information of the damping component according to a change trend of the electrical parameter of the variable electrical signal, and monitor the health status of the damping component based on the friction information.

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

5. The vibration reduction device according to claim 3, characterized in that: The electrical parameters of the variable electrical signal include open circuit voltage, short circuit current and transfer charge; the signal analysis module is also used to determine that the friction information of the damping component is an increase in friction when the absolute values ​​of the open circuit voltage, the short circuit current and the transfer 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 transfer charge.

6. The vibration reduction device according to claim 2, characterized in that: The signal analysis module is further used to obtain vibration information of the cable according to a change trend of the electrical parameter of the variable electrical signal, and to monitor the health status of the damping component based on the vibration information.

7. The vibration reduction device according to claim 6, characterized in that: The electrical parameters of the variable electrical signal include open circuit voltage, short circuit current and transfer charge; the signal analysis module is also used to determine that the vibration information of the 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 transfer charge is less than a preset value.

8. The vibration reduction device according to claim 2, characterized in that: The acquisition module includes an electrode plate and a signal acquisition element; The electrode plates are electrically connected to the damping assembly and the signal acquisition element respectively, and are used to transmit the variable electrical signal to the signal acquisition element so that the signal acquisition element acquires electrical parameters of the variable electrical signal; 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 reduction device according to claim 8, characterized in that: The electrode plate comprises a first polarity electrode plate and a second polarity electrode plate, and the first polarity electrode plate and the second polarity electrode plate are arranged at intervals along the first direction; The first polarity electrode plate and the second polarity electrode plate are both 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 electrical parameters of the variable electrical signal of the damping component through the conductive path.

10. The vibration reduction device according to claim 9, characterized in that: The damping assembly comprises a first friction plate and a second friction plate, the first friction plate and the second friction plate are arranged at intervals along the first direction, the first friction plate is electrically connected to the first polarity electrode plate, and the second friction plate is electrically connected to the second polarity electrode plate; Wherein, when the inclined cable vibrates to a preset degree, the bracket assembly rubs back and forth between the first friction plate and the second friction plate, so that the first friction plate and the second friction plate generate variable charges; The first polarity electrode plate and the second polarity electrode plate transmit the variable charge to the signal collection element in the form of the variable electrical signal.

11. The vibration reduction device according to any one of claims 8 to 10, characterized in that: The electrode plate is fixed between the bracket assembly and the damping assembly by means of conductive glue.

12. The vibration reduction device according to claim 1, characterized in that: The bracket assembly includes a friction bolt, a first movable member, a second movable member and a fixed member; The friction bolt is fixed to the first end of the first movable member, and is used to be arranged in close contact with the damping assembly, and to rub against the damping assembly in the first direction when the inclined cable vibrates to a preset degree; The second end of the first movable member is movably connected to the first end of the second movable member, and is used for translational movement 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 supporting portion of the fixed member, the movable end of the second movable member is movably connected to the second supporting portion of the fixed member, and 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 supporting portion of the fixing member is fixed to the bridge deck of the cable-stayed bridge, and the first supporting portion and the second supporting portion extend in two mutually perpendicular directions respectively, for jointly supporting the second movable member.

13. The vibration reduction device according to claim 12, characterized in that: The second end of the first movable member is movably connected to the first end of the second movable member via a first sliding bolt; the movable end of the second movable member is movably connected to the second supporting portion of the fixed member via 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 the first direction.

14. The vibration reduction device according to claim 13, characterized in that: The first end of the second movable member is provided with a first slide groove; the first slide groove is used to provide a translation track for translation along the first direction; Wherein, the first sliding bolt is arranged in the first sliding groove, and is used for driving the first movable member to move in translation in the first sliding groove.

15. The vibration reduction device according to claim 13, characterized in that: The second support portion is provided with a second slide groove and a slide bar; the second slide groove is used to provide a translation track for translation 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 through the second sliding bolt. The sliding bar is used to drive the second movable member to move in translation in the second sliding groove.

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