Flexible cable vortex-induced vibration control device and system based on flapping flexible body and use method

Abstract

The invention relates to the technical field of wind resistance of flexible structures such as bridge slings or power transmission lines, and discloses a flexible cable vortex-induced vibration control device and system based on flapping flexible bodies and a using method. The device comprises a rotating module, wherein the rotating module comprises two half-and-half detachable bearing structures which are detachably mounted on a sling or a power transmission line through fixing bolt structures; the transmission module comprises two rolling pulleys correspondingly mounted on the two half-and-half detachable bearing structures and a stainless steel wire rope which is arranged on the two rolling pulleys in a sleeving manner and can perform reciprocating transmission up and down; the rectification module comprises a plurality of flexible plates and a plurality of steel wire rope buckles, and the flexible plates are alternately fixed on the stainless steel wire ropes on the outer side through the steel wire rope buckles; on the premise that a sling structure or a power transmission line structure is not affected, quick mounting and dismounting are achieved, the structure is kept attractive, meanwhile, assembling is easy and convenient, and the device can rotate freely along with wind and is adaptive to incoming flows in all directions.

Description

Technical Field

[0001] The present invention relates to the field of wind resistance technology for flexible structures such as bridge suspension cables or transmission lines, and in particular to a flexible cable vortex-induced vibration control device, system and use method based on flapping flexible bodies. Background Art

[0002] With the rapid development of social economy and science and technology, the span records of modern bridges and transmission lines are constantly being refreshed, and the structural form is developing in a more flexible and slender direction, and the demand for flexible beams is growing. Cable structures have a large slenderness ratio, low frequency, and low damping. They are prone to large vibrations under wind loads, resulting in complex vortex-induced vibration phenomena.

[0003] In recent years, vibration of cable structures or transmission lines of large-span bridges at home and abroad has been common. For example, the cable of the Akashi Kaikyo Bridge experienced large oscillations, resulting in the failure of the rubber damper between the cable strands; the Dongting Lake Bridge, Xihoumen Bridge, and Sutong Bridge all experienced large wind-induced vibrations of the cable structure, causing the damage of the sleeve and oil leakage of the damper, which seriously threatened the normal use and service life of the bridge. At the same time, UHV transmission lines have the characteristics of "high and flexible" towers and long line spans, especially the large-scale galloping caused by ice on the transmission lines is very prominent. For example, in 2015, two large-scale transmission line galloping phenomena occurred in a certain province, with a galloping amplitude of 3-7 m and a duration of 46 hours, resulting in more than 23 trippings and huge losses.

[0004] In general, although vortex-induced vibration is a self-excited vibration with limited amplitude, which will not cause divergent vibration of the structure until it becomes unstable and damaged, some of its characteristics have potential hazards. First, the large vibration of the cable structure will bring problems with driving visual safety and driving comfort, and in severe cases, traffic may even have to be closed urgently; second, since the wind speed section where vortex vibration occurs is relatively low, the probability of vibration is relatively high under normal wind speeds, and frequent vibrations can easily lead to fatigue damage at the anchor end of the main cable and the cable joint, further causing corrosion to the internal structure, thereby affecting the normal service life of the bridge structure or the transmission line structure and increasing the full life cycle cost. Therefore, the effective control of vortex-induced vibration of flexible cables has become an important link that the industry urgently needs to solve, and it has great prospects and value for practical engineering applications.

[0005] At present, passive measures are mainly used to deal with the wind-induced vibration of slings, such as winding a spiral wire on the surface of the sling to change the vortex shedding mode. However, this method is affected by many sensitive parameters such as the number of winding turns, spiral wire diameter, and spiral wire spacing. The control method is not universal and the effect is not ideal. Some scholars have also proposed adding a damper at the end of the sling. Although it can improve the overall damping ratio of the sling, it still cannot effectively control the vibration of the cable strand due to the low installation height. The flow control measure injects appropriate disturbances into the flow field to couple with the inherent mode of the flow to produce a control effect. Existing studies have shown that the combined blowing on the windward and leeward sides of the cylindrical surface can effectively suppress the Karman vortex street and lateral vibration of the structure. However, active measures require a matching integrated control system to provide power transmission, signal sensing and control equipment. It is difficult to implement on the sling structure, and its application in actual engineering is very limited.

[0006] Furthermore, by observing the flow phenomena in nature, we can find that in extremely severe typhoon weather, sturdy trees can be uprooted, while seemingly fragile grass can withstand strong winds; fish and birds interact with the surrounding flow field by flapping their tails and wings, thereby reducing resistance and increasing forward thrust. The phenomena of biological flight and swimming actually contain a lot of fluid mechanics knowledge. Based on the concept of bionics, if a flexible flapping device can be added to the tail of the sling structure to affect its tail flow field characteristics and thus reduce the resistance and pulsating lift of the structure itself, the vortex-induced vibration phenomenon of the sling can be effectively weakened, further ensuring the safety of the overall structure and its service life.

[0007] In the prior art, the patent with publication number "CN112145857A" proposes a vortex-induced vibration suppression device for marine flexible risers. The device adopts a segmented casing to realize the adaptive rotation of the device as the incoming flow direction changes. The installation method requires the casing to be put on the outer wall of the riser in advance, and the temporary installation and disassembly of the device cannot be realized. The device is not suitable for vortex-induced vibration control of flexible cable structures such as bridge cables or transmission lines.

[0008] Therefore, a flexible cable vortex-induced vibration control device, system and use method based on a flapping flexible body are provided, which is suitable for flexible cable structures such as bridge cables or transmission lines and is easy to install and disassemble. Summary of the invention

[0009] In order to solve the above problems in the prior art, the present invention provides a flexible cable vortex-induced vibration control device, system and use method based on a flapping flexible body, which is suitable for flexible cable structures such as bridge cables or transmission lines and is easy to install and disassemble.

[0010] First, the present invention provides a flexible cable vortex-induced vibration control device based on a flapping flexible body, comprising: The rotating module includes two half-detachable bearing structures detachably mounted on the sling or the transmission line through a fixing bolt structure; A transmission module, comprising two rolling pulleys correspondingly mounted on the two half-detachable bearing structures, and a stainless steel wire rope sleeved on the two rolling pulleys and capable of reciprocating up and down transmission; and The rectifier module comprises a plurality of flexible plates and a plurality of steel wire rope buckles, wherein the flexible plates are alternately fixed on the stainless steel wire ropes on the outside through the steel wire rope buckles.

[0011] The half-detachable bearing structure includes two half-jointed bearing inner rings, two half-jointed bearing outer rings, a plurality of steel balls, and an external rigid plate; after the bearing outer ring and the bearing inner ring are assembled, an arc-shaped slideway is reserved, and the steel balls can be inserted into the arc-shaped slideway to realize the relative sliding between the bearing outer ring and the bearing inner ring; the two joint ends of the bearing outer ring are provided with the external rigid plate, and the fixing bolt structure can detachably fix the two half-detachable bearing structures with the cooperation of the external rigid plates of the two mutually jointed bearing outer rings.

[0012] The half-detachable bearing structure also includes a temporary fixing buckle for cooperative installation.

[0013] The integral rolling bearing formed by the two spliced ​​half-detachable bearing structures is coaxial with the sling or transmission line.

[0014] The external rigid plate is configured as a rectangular thin plate and is welded to the joint end of the bearing outer ring.

[0015] The external rigid plate is set as a rectangular thin plate with a length, width and height of 3cm×4cm×0.6cm, and is welded at a position 2cm away from the splicing end of the bearing outer ring; the bolts of the fixing bolt structure are M6 hexagonal bolts.

[0016] The length, width and thickness of the flexible plate are 4 to 7 times, 3 to 8 times and 0.1 to 0.3 times the diameter of the sling or the transmission line respectively; the spacing between two adjacent flexible plates is 5 to 8 times the diameter of the sling or the transmission line.

[0017] The flexible plate is made of polytetrafluoroethylene material.

[0018] Secondly, the present invention provides a flexible cable vortex-induced vibration control system based on a flapping flexible body, which includes two or more flexible cable vortex-induced vibration control devices based on a flapping flexible body as described above.

[0019] Again, the present invention provides a method for using a flexible cable vortex-induced vibration control device based on a flapping flexible body: The two half-detachable bearing structures of the rotating module are pre-installed at the upper and lower ends of the sling, and the upper and lower half-detachable bearing structures are installed along the bridge direction; during installation, temporary fixing buckles are used to prevent the steel balls from falling off, and after the outer rings of the bearings are connected, the temporary fixing buckles are removed and the fixing bolt structure is tightened; After the fixing bolt structure on the side without the transmission module is tightened, the fixing bolt structure on the other side is passed through the rolling pulley of the transmission module to lock and fix the two external rigid plates; and a circle of stainless steel wire rope is wound around the rolling pulleys fixed at the upper and lower ends of the sling; Several flexible boards of the rectifier module are fixed in series on another wire rope at preset intervals through wire rope buckles as a backup; when a strong wind warning is detected at the bridge site, the wire rope with the flexible boards in series is temporarily tied to the stainless steel wire rope of the transmission module pre-installed on the sling, and the flexible tail boards in series are arranged at the tail of the sling or at the preset position of the sling with the cooperation of the rolling pulley.

[0020] The technical solution of the present invention has the following advantages: 1. The flexible cable vortex-induced vibration control device based on flapping flexible body provided by the present invention adopts a detachable half-detachable bearing structure, which can realize rapid installation and disassembly without affecting the cable structure or the transmission line structure. It is simple and convenient to assemble while maintaining the beautiful structure, and is easy to produce, repair and replace. At the same time, when the wind environment of the cable structure or the transmission line structure is relatively complex and changeable, the rectifier module can rotate arbitrarily with the wind under the action of the rotating module, thereby driving the flexible plate to adapt to the incoming flow in all directions, thereby improving the control effect of the device and its ability to adapt to environmental changes.

[0021] 2. The rectifier module of the flexible cable vortex-induced vibration control device based on flapping flexible body provided by the present invention is a series flexible plate distributed along the length direction of the cable / transmission line, and the flexible plate has the advantages of light weight and resistance to high temperature and rain erosion. During use, the vortex shedding generated by the upstream cable / transmission line produces a periodic pressure difference on the front and rear sides of the flexible body, causing the flexible body to produce adaptive flapping deformation, so that the vortex shedding at the tail of the cable / transmission line is better transitioned. At the same time, after experiments, simulation results also show that the addition of a flexible body can greatly reduce the pulsating lift of the upstream cable cross section, which is very beneficial to the control of the vortex-induced vibration of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a three-dimensional schematic diagram and a partially enlarged schematic diagram of the flexible cable vortex-induced vibration control device based on a flapping flexible body according to the present invention; Figure 2 The front view (1), side view (2), top view (3), enlarged view (4) and AA and BB cross-sectional schematic diagrams of the flexible cable vortex-induced vibration control device based on flapping flexible body according to the present invention; Figure 3 is the pressure contour map of the flow field; Figure 4 The flow field cloud diagram at different times; Figure numerals: 1-sling, 2-external rigid plate, 3-fixing bolt structure, 4-steel ball, 5-temporary fixing buckle, 6-bearing outer ring, 7-bearing inner ring, 8-rolling pulley, 9-flexible plate, 10-stainless steel wire rope, 11-wire rope buckle. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The following content is only an example and explanation of the concept of the present invention. The technicians in the relevant technical field make various modifications or supplements to the specific implementation cases described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all belong to the protection scope of the present invention. The experimental reagents and materials used in the following examples, unless otherwise specified, can all be obtained from commercial channels.

[0025] Example 1: Figure 1 As shown, this embodiment provides a flexible cable vortex-induced vibration control device based on a flapping flexible body, comprising: The rotating module comprises two half-detachable bearing structures detachably mounted on the sling 1 or the transmission line through a fixing bolt structure 3; A transmission module, comprising two rolling pulleys 8 correspondingly mounted on the two half-detachable bearing structures, and a stainless steel wire rope 10 sleeved on the two rolling pulleys 8 and capable of reciprocating up and down transmission; and The rectifier module includes a plurality of flexible plates 9 and a plurality of steel wire rope buckles 11 . The flexible plates 9 are fixed alternately on the stainless steel wire ropes 10 on the outside through the steel wire rope buckles 11 .

[0026] In this embodiment, a detachable half-detachable bearing structure is adopted to achieve rapid installation and disassembly without affecting the structure of the sling 1 or the structure of the transmission line. While maintaining the beautiful structure, the assembly is simple and convenient, and it is easy to produce, repair and replace. At the same time, when the wind environment of the sling 1 structure or the transmission line structure is relatively complex and changeable, the rectifier module can rotate arbitrarily with the wind under the action of the rotating module, thereby driving the flexible plate 9 to adapt to the incoming flow in all directions, thereby improving the control effect of the device and the ability to adapt to environmental changes.

[0027] Specifically, the half-detachable bearing structure includes two half-spliced ​​bearing inner rings 7, two half-spliced ​​bearing outer rings 6, a plurality of steel balls 4, and an external rigid plate 2; after the bearing outer ring 6 and the bearing inner ring 7 are assembled, an arc-shaped slideway is reserved, and the steel balls can be inserted into the arc-shaped slideway to realize the relative sliding between the bearing outer ring 6 and the bearing inner ring 7; the two spliced ​​ends of the bearing outer ring 6 are provided with the external rigid plate 2, and the fixing bolt structure 3 can detachably fix the two half-detachable bearing structures with the cooperation of the external rigid plates 2 of the two mutually spliced ​​bearing outer rings 6.

[0028] Wherein, the half-disassembled bearing structure also includes a temporary fixing buckle 5 for cooperative installation. In this embodiment, the function of the temporary fixing buckle 5 is: when the half-disassembled bearing is not in use, by pressing the fixing buckle inwards, it is fixed to the port of the bearing to prevent the balls inside the bearing from falling off. Therefore, it can be any existing U-shaped buckle in the prior art that can achieve the above function. Of course, in actual selection, it is preferred that the spacing of the temporary fixing buckle 5 gradually widens along the end direction, and the distance at the end is slightly larger than the width of the pulley track inside the bearing, so that when the half-disassembled bearing is not in use, by pressing the fixing buckle inwards, it is fixed to the port of the bearing to prevent the balls inside the bearing from falling off.

[0029] During assembly or installation, first press the temporary fixing buckle 5 inwards and remove it from the bearing port, place the half bearing ring on the surface of the structure, pass the fixing bolt 3 through the preset threaded hole of the external rigid plate 2, and further tighten the fixing bolt structure 3 until the half disassembled bearing structure is firmly fixed on the sling 1 or the transmission line; the fixing bolt structure 3 includes a fixing bolt and a corresponding nut, and the fixing bolt passes through the two adjacent external rigid plates 2 and the half disassembled bearing structure is locked into one and fixed on the sling 1 in cooperation with the nut. At the same time, as a preferred embodiment, the rolling pulley 8 of the transmission module is sleeved on the fixing bolt 3 on one side, which can not only reduce the setting of more supporting components, but also maintain the beautiful appearance of the sling 1 to the greatest extent.

[0030] Specifically, the integral rolling bearing formed by the two half-detachable bearing structures after splicing is coaxial with the sling 1 or the transmission line. That is, the cross-sectional rotation center of the rolling bearing coincides with the cross-sectional area of ​​the sling 1, the inner wall of the bearing is in close contact with the surface of the sling 1, and the outer wall of the bearing (i.e., the outer ring 6 of the bearing) can rotate and slide arbitrarily through the embedded roller (i.e., the steel ball), so that the rotating module drives the rectifying module or the flexible cable vortex-induced vibration control device based on the flapping flexible body can adaptively adjust the flapping direction according to the incoming flow.

[0031] Among them, the external rigid plate 2 is set as a rectangular thin plate, and is welded to the splicing end of the bearing outer ring 6; as a preferred implementation method, the external rigid plate 2 is set as a rectangular thin plate with a length, width and height of 3cm×4cm×0.6cm, and is welded at a position 2cm away from the splicing end of the bearing outer ring 6; the bolts of the fixing bolt structure 3 are M6 hexagonal bolts.

[0032] Furthermore, the length, width and thickness of the flexible plate 9 are 4 to 7 times, 3 to 8 times and 0.1 to 0.3 times the diameter of the sling 1 or the transmission line, respectively; the spacing between two adjacent flexible plates 9 is 5 to 8 times the diameter of the sling 1 or the transmission line. It should be noted that if the size and thickness of the flexible plate 9 are too large, it will cause difficulties in installation and disassembly, and its large rigidity makes it difficult to form a flapping effect to play a vibration reduction role; at the same time, if its size is too small, it cannot effectively transition the vortex shedding, resulting in poor vibration reduction effect. Therefore, a spacing of 5 to 8 times the flexible plate 9 is preferred, which can not only provide a better flow control effect but also take into account the manufacturing cost.

[0033] As a preferred embodiment, the flexible plate 9 is made of polytetrafluoroethylene material, which is light, low in hardness, and also has excellent properties of high temperature resistance and corrosion resistance. It can adaptively flap along with the vortex shedding at the tail of the sling 1. In this embodiment, the leading edge of the flexible plate 9 is fixed to the stainless steel wire rope 10 of the transmission module through a wire rope buckle 11.

[0034] In this embodiment, the rectifier module is a series flexible plate 9 distributed along the length direction of the cable 1 / transmission line, and the flexible plate 9 has the advantages of light weight, resistance to high temperature and rain erosion, etc.; during use, the vortex shedding generated by the upstream cable 1 / transmission line produces a periodic pressure difference on the front and rear sides of the flexible body, causing the flexible body to produce adaptive flapping deformation, so that the vortex shedding at the tail of the cable 1 / transmission line is better transitioned; at the same time, after experiments, simulation results also show that the addition of a flexible body can greatly reduce the pulsating lift of the cross section of the upstream cable 1, which is very beneficial to the control of vortex-induced vibration of the cable 1, and can effectively suppress vortex-induced vibration.

[0035] In actual use, when the weather at the bridge site is changeable and the wind field is turbulent, and the cable 1 undergoes large wind-induced vibrations, it is difficult to temporarily install the vibration suppression device, so it is necessary to achieve rapid deployment before a strong wind warning, and it is also necessary to have good disassembly performance to maintain the daily beauty of the structure; in this embodiment, the rotation module and the transmission module can be pre-installed on the cable 1 in advance, and at the same time, the flexible plate 9 of the rectifier module is prefabricated as a whole on an additional wire rope through the wire rope buckle 11. When a strong wind warning is detected at the bridge site, the serial flexible plate 9 or the wire rope of the rectifier module is temporarily tied to the stainless steel wire rope 10 of the transmission module that has been pre-installed on the cable 1, and then the rectifier module is adjusted to the desired position / preset position with the cooperation of the rolling pulley 8 of the transmission module; in this way, the deficiency that the vibration suppression device in the prior art can only be installed separately in sections is compensated, and the suspension and disassembly efficiency of the flexible plate 9 is greatly improved.

[0036] Next, numerical simulation calculations are performed on the control device provided in this embodiment based on multi-physics field simulation software. Since the sling 1 is arranged in the usual manner along its axial direction, the calculation model can be simplified into a two-dimensional cylindrical section of the upstream sling 1 and a slender rectangular section of the downstream; the sling 1 is fixed and does not vibrate with the flow field, and the rectangular domain is defined by its Young's modulus, and the flexible flapping motion of the rectangular component is realized based on the bidirectional fluid-solid coupling solution of the multi-physics field; the calculation process simultaneously monitors the lift and drag on the cylindrical surface, and saves the flow field cloud map at different typical times, thereby proving that the device of this embodiment can effectively suppress vortex-induced vibration.

[0037] like Figure 4 As shown, Figure 4 (a) The Young's modulus of the flexible body is 10 MPa, Figure 4 (b) The Young's modulus of the flexible body is 3 MPa. Specifically, one lift cycle of the upstream sling 1 is denoted as T, and the time when the lift is at the trough is defined as t=0, the time when the lift rises from the trough to the equilibrium position is defined as t=T / 4, the time when the lift reaches the crest is defined as t=T / 2, and the time when the lift drops from the crest to the equilibrium position is defined as t=3T / 4.

[0038] Figure 3 (a) and Figure 3 (b) are the pressure contours of the flow field when the Young's modulus of the flexible body is 10MPa and 3MPa, respectively. The incoming flow forms a high-pressure area at the stagnation point at the leading edge of the sling 1. The fluid flowing along the surface of the sling 1 separates from the wall near the upper and lower vertices. The separated fluid forms a vortex along the tail of the sling 1 due to the adverse pressure gradient. The vortices that alternately shed from the sling 1 flow through the two sides of the flexible body in turn. The pressure difference between the upper and lower parts causes the flexible body to bend and flap, which in turn affects the flow field at the tail of the sling 1.

[0039] contrast Figure 3 (a) and Figure 3(b) Flow field at the tail of sling 1. It can be found that the decrease of Young's modulus of the flexible body leads to a decrease of its ability to resist deformation. Under the same incoming flow velocity, Figure 3 (b) The deformation of the flexible body is more significant. The vortex shedding generated on the upper and lower sides of the sling 1 is separated by the flexible body and transitions to the upper and lower surfaces of the flexible body, and finally falls off at the downstream tail of the entire structure. The addition of the flexible body can effectively reduce the pulsating lift value on the surface of the sling 1 and suppress the vortex-induced vibration phenomenon of the sling 1.

[0040] like Figure 3 As shown in (a), when the Young's modulus of the flexible body is reduced from 10MPa to 3MPa, the pulsation Cl-rms (pulsation lift coefficient value) of the upstream cable 1 changes from 1.697 to 0.565, and the lift pulsation value decreases by 66.7%. A large number of studies have shown that the vortex-induced vibration of cable 1 is mainly transverse vibration, and its excitation source comes from the pulsating lift generated by the alternating shedding vortices at the upper and lower vertices of cable 1.

[0041] The above numerical simulation calculation results further illustrate that the flexible cable vortex-induced vibration control device based on flapping flexible body provided in this embodiment can effectively reduce the pulsating lift size of the suspension cable 1, verifying the effectiveness of the present application.

[0042] Embodiment 2: Based on Embodiment 1, this embodiment provides a flexible cable vortex-induced vibration control system based on a flapping flexible body, which includes two or more flexible cable vortex-induced vibration control devices based on a flapping flexible body as described above.

[0043] In actual use, when the length of the suspension cable 1 or the transmission line is long and the wind field is relatively turbulent, two or more flexible rope vortex-induced vibration control devices based on flapping flexible bodies can be arranged at intervals or at specific positions on the same suspension cable 1 or transmission line, thereby forming a flexible rope vortex-induced vibration control system based on flapping flexible bodies to achieve the best control effect and the ability to adapt to environmental changes.

[0044] Embodiment 3: Based on Embodiment 1, this embodiment provides a method for using a flexible cable vortex-induced vibration control device based on a flapping flexible body, which specifically includes the following steps: The two half-detachable bearing structures of the rotating module are pre-installed at the upper and lower ends of the sling 1, and the upper and lower half-detachable bearing structures are installed along the bridge direction; wherein, during installation, a temporary fixing buckle 5 is used to prevent the steel ball from falling off, and after the bearing outer ring 6 is connected, the temporary fixing buckle 5 is removed, and the fixing bolt structure 3 is tightened; After the fixing bolt structure 3 on the side without the transmission module is tightened, the fixing bolt structure 3 on the other side is passed through the rolling pulley 8 of the transmission module to lock and fix the two external rigid plates 2; and a circle of stainless steel wire rope 10 is wound around the rolling pulley 8 fixed at the upper and lower ends of the sling 1; Several flexible boards 9 of the rectifier module are fixed in series on another steel wire rope at preset intervals through steel wire rope buckles 11 as a backup; when a strong wind warning is detected at the bridge site, the steel wire rope with the flexible boards 9 in series is temporarily tied to the stainless steel wire rope 10 of the transmission module pre-installed on the sling 1, and the flexible tail boards in series are arranged at the tail of the sling 1 or at a preset position of the sling 1 with the cooperation of the rolling pulley 8.

[0045] In this way, in a complex bridge deck wind environment, if the incoming flow direction changes, due to the uneven force on both sides of the flexible plate 9, the upper and lower bearings drive the overall control device to rotate around the cable 1, thereby adapting to the change in the incoming wind direction angle; the flexible plate 9 transfers the vortex generated at the tail of the cable 1 to the tail of the overall control device, thereby reducing the pulsating lift value on the surface of the cable 1 and effectively suppressing vortex-induced vibration.

[0046] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A flexible cable vortex-induced vibration control device based on a flapping flexible body, characterized in that: include: The rotating module comprises two half-detachable bearing structures which are detachably mounted on the sling (1) or the transmission line via a fixing bolt structure (3); A transmission module, comprising two rolling pulleys (8) correspondingly mounted on the two half-detachable bearing structures, and a stainless steel wire rope (10) sleeved on the two rolling pulleys (8) and capable of reciprocating up and down transmission; and The rectifier module comprises a plurality of flexible plates (9) and a plurality of steel wire rope buckles (11), wherein the flexible plates (9) are fixed alternately on the stainless steel wire ropes (10) on the outside via the steel wire rope buckles (11).

2. The vortex-induced vibration control device based on a flapping flexible body according to claim 1 is characterized in that: The half-detachable bearing structure comprises two half-jointed bearing inner rings (7), two half-jointed bearing outer rings (6), a plurality of steel balls, and an external rigid plate (2); after the bearing outer ring (6) and the bearing inner ring (7) are assembled, an arc-shaped slideway is reserved, and the steel balls can be inserted into the arc-shaped slideway to realize relative sliding between the bearing outer ring (6) and the bearing inner ring (7); the two joint ends of the bearing outer ring (6) are provided with the external rigid plate (2), and the fixing bolt structure (3) can detachably fix the two half-detachable bearing structures in cooperation with the external rigid plates (2) of the two mutually joined bearing outer rings (6).

3. The vortex-induced vibration control device based on a flapping flexible body according to claim 2 is characterized in that: The half-detachable bearing structure also includes a temporary fixing buckle (5) for cooperative installation.

4. The vortex-induced vibration control device based on a flapping flexible body according to claim 2 is characterized in that: The integral rolling bearing formed by the two spliced ​​half-detachable bearing structures is coaxial with the sling (1) or the transmission line.

5. The vortex-induced vibration control device based on a flapping flexible body according to claim 2, characterized in that: The external rigid plate (2) is configured as a rectangular thin plate and is welded to the splicing end of the bearing outer ring (6).

6. The vortex-induced vibration control device based on a flapping flexible body according to claim 5, characterized in that: The external rigid plate (2) is a rectangular thin plate with a length, width and height of 3 cm×4 cm×0.6 cm, and is welded at a position 2 cm away from the splicing end of the bearing outer ring (6); the bolts of the fixing bolt structure (3) are M6 hexagonal bolts.

7. The vortex-induced vibration control device based on a flapping flexible body according to claim 1, characterized in that: The length, width and thickness of the flexible plate (9) are respectively 4 to 7 times, 3 to 8 times and 0.1 to 0.3 times the diameter of the sling (1) or the transmission line; the spacing between two adjacent flexible plates (9) is 5 to 8 times the diameter of the sling (1) or the transmission line.

8. The vortex-induced vibration control device based on a flapping flexible body according to claim 1, characterized in that: The flexible plate (9) is made of polytetrafluoroethylene material.

9. A flexible cable vortex-induced vibration control system based on a flapping flexible body, characterized in that: It comprises two or more flexible cable vortex-induced vibration control devices based on flapping flexible bodies as described in any one of claims 1-8.

10. A method for using a flexible cable vortex-induced vibration control device based on a flapping flexible body, characterized in that: It includes the following steps: Two half-detachable bearing structures of the rotating module are pre-installed at the upper and lower ends of the sling, and the upper and lower half-detachable bearing structures are installed along the bridge direction; during installation, a temporary fixing buckle (5) is used to prevent the steel ball from falling off, and after the bearing outer ring (6) is connected, the temporary fixing buckle (5) is removed and the fixing bolt structure (3) is tightened; After the fixing bolt structure (3) on the side without the transmission module is tightened, the fixing bolt structure (3) on the other side is passed through the rolling pulley (8) of the transmission module to lock and fix the two external rigid plates (2); and a circle of stainless steel wire rope (10) is wound around the rolling pulley (8) fixed at the upper and lower ends of the sling; A plurality of flexible plates (9) of the rectifier module are fixedly arranged in series on another steel wire rope at preset intervals through steel wire rope buckles (11) as a backup; when a strong wind warning is detected at the bridge site, the steel wire rope with the flexible plates (9) in series is temporarily tied to the stainless steel wire rope (10) of the transmission module pre-installed on the sling, and the flexible tail plates in series are arranged at the tail of the sling or at a preset position of the sling with the cooperation of a rolling pulley (8).

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