Annular nonlinear energy trap device for reducing cable vibration of cable-stayed bridge

Abstract

The utility model discloses an annular nonlinear energy trap device for reducing vibration of a cable-stayed bridge cable, which comprises a stay cable, a mounting mechanism is mounted in the middle of the stay cable, and an annular mass block is arranged on the outer side of the mounting mechanism. The device can effectively reduce the vibration of the stay cable in any direction through the synergistic effect of the damper and the connecting spring within the range of 0-2 pi of the annular mass block, and the annular mass block vibration reduction device has the advantages that the frequency robustness is high, the excellent broadband vibration reduction capacity is shown, the vibration energy of a main body structure can be effectively captured, and the vibration of the stay cable in any direction can be effectively reduced. According to the stay cable damping device, the damping component is arranged on the stay cable and transfers the damping component to the stay cable, finally energy dissipation is carried out through the damping component, efficient damping of the stay cable can be achieved only through the single annular structure, and therefore the damping performance is improved, material use optimization is achieved, and economic cost is reduced at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of cable-stayed bridge cable vibration reduction, in particular to an annular nonlinear energy sink device for reducing cable-stayed bridge cable vibration. Background Art

[0002] At present, the vibration of the cable-stayed bridge can be divided into two categories: vibration caused by wind and vibration caused by non-wind factors. Both vibration modes may have a serious impact on the long-term stability and safety of the cable-stayed bridge. Therefore, it is crucial to take effective vibration reduction measures, which will help to control and prevent the vibration of the cable-stayed bridge in the long term and ensure the safe operation of the cable-stayed bridge. At present, the vibration reduction technology for the cable-stayed bridge mainly includes the following four methods: (1) pneumatic and mechanical measures, (2) semi-active control system, (3) active control system, and (4) passive control system.

[0003] However, traditional vibration reduction measures have the following disadvantages:

[0004] (1) Aerodynamic measures usually involve changes to the surface of the cable, such as adding protrusions, opening grooves or setting pits. These changes will significantly affect the aerodynamic shape of the cable, resulting in an increase in the drag coefficient of the cable, which means that the force on the cable in the wind will increase, which may aggravate the vibration problem and even have an adverse impact on the safety of the bridge structure;

[0005] (2) The effect of mechanical vibration reduction measures may be affected by many factors, such as the vibration characteristics of the cable, the design parameters of the vibration reduction device, and environmental conditions. The vibration conditions of the cable stays of different bridges may be different, so customized design is required according to the specific situation. However, such customized design may increase the design difficulty and cost, and it is difficult to ensure that the ideal vibration reduction effect can be achieved in all cases.

[0006] (3) Semi-active control vibration reduction measures require precise control algorithms to adjust parameters in real time. However, due to the complexity of bridge structures and vibration characteristics, design and debugging are difficult, and the influence of environmental factors may reduce the stability of the system.

[0007] (4) Active control requires external energy supply to drive the actuator to adjust the vibration state of the cable in real time, which not only increases energy consumption but also may affect the normal operation of the active control system in some remote areas or when the energy supply is unstable;

[0008] (5) Passive control is mainly applicable to vibration isolation of bridge decks, but is not very applicable to vibration control of cable stays. Utility Model Content

[0009] The purpose of the utility model is to provide an annular nonlinear energy sink device for reducing the vibration of the cable of a cable-stayed bridge, so as to solve the problem that the aerodynamic measures proposed in the above-mentioned background technology usually involve changes to the surface of the cable, such as adding protrusions, opening grooves or setting pits, etc. These changes will significantly affect the aerodynamic shape of the cable, resulting in an increase in the drag coefficient of the cable, which means that the force on the cable in the wind will increase, which may aggravate the vibration problem and even have an adverse effect on the safety of the bridge structure; the effect of mechanical vibration reduction measures may be affected by many factors, such as the vibration characteristics of the cable, the design parameters of the vibration reduction device and the environmental conditions, etc. The vibration conditions of the cables of different bridges may be different, so it is necessary to determine the specific situation. However, this customized design may increase the difficulty and cost of design, and it is difficult to ensure that the ideal vibration reduction effect can be achieved in all cases; semi-active control vibration reduction measures require precise control algorithms to adjust parameters in real time, but due to the complexity of bridge structure and vibration characteristics, design and debugging are difficult, and the stability of the system may be reduced under the influence of environmental factors; active control requires external energy supply to drive the actuator to adjust the vibration state of the cable in real time, which not only increases energy consumption, but also may affect the normal operation of the active control system in some remote areas or when the energy supply is unstable; passive control is mainly suitable for vibration isolation of bridge decks, but is not very applicable to vibration control of cable.

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an annular nonlinear energy well device for reducing the vibration of a cable-stayed bridge, comprising an inclined cable, a mounting mechanism installed in the middle of the inclined cable, an annular mass block is provided on the outer side of the mounting mechanism, a plurality of vibration dampers are fixedly mounted on the inner side of the annular mass block, a plurality of connecting springs located on one side of the vibration damper are fixedly mounted on the annular mass block, the plurality of vibration dampers each comprise a first positioning rod, a damper and a second positioning rod, one end of the first positioning rod is fixedly connected to one end of the damper, the other end of the damper is fixedly connected to one end of the second positioning rod, the mounting mechanism comprises a first mounting shell and a second mounting shell, two ends of one side of the first mounting shell are respectively contacted and connected with two ends of one side of the second mounting shell, and four mounting holes arranged in a rectangular shape are provided on the surface of the first mounting shell and the surface of the second mounting shell.

[0011] Preferably, one end of the first positioning rod away from the damper is fixedly connected to the annular mass block, and one end of the second positioning rod away from the damper is fixedly connected to the mounting mechanism. The damper is responsible for dissipating the energy captured by the connecting spring to prevent it from being transmitted back to the inclined cable again.

[0012] Preferably, the ends of several connecting springs away from the annular mass block are fixedly connected to the side opposite to the mounting mechanism. The connecting springs can cause the annular mass block to resonate near the excitation frequency of the inclined cable, thereby achieving effective energy capture.

[0013] Preferably, a fixing bolt is threadedly connected between every two mounting holes, and locking nuts are threadedly connected to the surfaces of the four fixing bolts. The user rotates the fixing bolt to pass through the mounting hole, and then the user twists the locking nut. The thread on the inner wall of the locking nut matches the thread on the surface of the fixing bolt, so the locking nut rotates and translates relative to the fixing bolt to fix the first mounting shell and the second mounting shell together.

[0014] Preferably, the middle part of one side of the first mounting shell and the middle part of one side of the second mounting shell are both in contact with and connected to the side directly opposite to the inclined cable, and the user buckles the first mounting shell and the second mounting shell together on both sides of the inclined cable.

[0015] Compared with the prior art, the beneficial effect of the utility model is that the device can effectively reduce the vibration of the inclined cable in any direction within the range of 0-2π of the annular mass block through the synergistic effect of the damper and the connecting spring. The advantage of the annular mass block vibration reduction device is that it has strong frequency robustness and exhibits excellent wide-band vibration reduction capability. It can effectively capture the vibration energy of the main structure and transfer it to itself, and finally dissipate the energy through the damping element. Moreover, only a single annular structure is required to achieve efficient vibration reduction of the inclined cable, thereby optimizing material use and reducing economic costs while improving the vibration reduction performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the connection between the device of the utility model and the inclined cable;

[0017] Figure 2 It is a partial schematic diagram of the utility model;

[0018] Figure 3 It is a top view of the utility model;

[0019] Figure 4 It is an exploded view of the installation mechanism of the utility model.

[0020] In the figure: 1. annular mass block; 2. mounting mechanism; 21. first mounting shell; 22. fixing bolt; 23. mounting hole; 24. locking nut; 25. second mounting shell; 3. vibration damping member; 31. first positioning rod; 32. damper; 33. second positioning rod; 4. connecting spring; 5. inclined cable. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] See also Figure 1-4 The utility model provides an annular nonlinear energy sink device for reducing the vibration of a cable-stayed bridge, comprising an inclined cable 5, a mounting mechanism 2 is installed in the middle of the inclined cable 5, an annular mass block 1 is provided on the outer side of the mounting mechanism 2, a plurality of vibration dampers 3 are fixedly installed on the inner side of the annular mass block 1, a plurality of connecting springs 4 located on one side of the vibration dampers 3 are fixedly installed on the annular mass block 1, the plurality of vibration dampers 3 each comprise a first positioning rod 31, a damper 32 and a second positioning rod 33, one end of the first positioning rod 31 is fixedly connected to one end of the damper 32, the other end of the damper 32 is fixedly connected to one end of the second positioning rod 33, the mounting mechanism 2 comprises a first mounting shell 21 and a second mounting shell 25, two ends of one side of the first mounting shell 21 are respectively contacted and connected with two ends of one side of the second mounting shell 25, and four mounting holes 23 arranged in a rectangular shape are provided on the surface of the first mounting shell 21 and the surface of the second mounting shell 25.

[0023] One end of the first positioning rod 31 away from the damper 32 is fixedly connected to the annular mass block 1, and one end of the second positioning rod 33 away from the damper 32 is fixedly connected to the mounting mechanism 2. The damper 32 is responsible for dissipating the energy captured by the connecting spring 4 to prevent it from being transmitted back to the inclined cable 5 again.

[0024] The ends of several connecting springs 4 away from the annular mass block 1 are fixedly connected to the side opposite to the mounting mechanism 2. The connecting springs 4 can make the annular mass block 1 resonate near the excitation frequency of the inclined cable 5, thereby realizing effective energy capture.

[0025] A fixing bolt 22 is threadedly connected between every two facing mounting holes 23, and locking nuts 24 are threadedly connected to the surfaces of the four fixing bolts 22. The user rotates the fixing bolts 22 to pass through the mounting holes 23, and then the user twists the locking nuts 24. The threads on the inner walls of the locking nuts 24 match the threads on the surfaces of the fixing bolts 22, so the locking nuts 24 rotate and translate relative to the fixing bolts 22 to fix the first mounting shell 21 and the second mounting shell 25 together.

[0026] The middle part of one side of the first installation shell 21 and the middle part of one side of the second installation shell 25 are both in contact with and connected to the side directly opposite to the inclined cable 5 , and the user buckles the first installation shell 21 and the second installation shell 25 together on both sides of the inclined cable 5 .

[0027] When the embodiment of the present application is in use: three connecting springs 4 and three vibration dampers 3 are arranged in the annular mass block 1, so that these six accessories all act on one point of the cable, thereby producing a vibration reduction effect on the inclined cable 5; the main structure adopts an equilateral triangle shape to arrange the connecting springs 4 and the vibration dampers 3, so that the vibration of the inclined cable 5 in any direction can be effectively reduced through the synergistic effect of the connecting springs 4 and the vibration dampers 3, and the connecting springs 4 can make the annular mass block 1 resonate near the excitation frequency of the inclined cable 5, thereby realizing effective energy capture; and the damper 32 is responsible for dissipating these captured The energy captured is prevented from being transmitted back to the inclined cable 5 again. The combination of this resonance capture and energy dissipation enables the annular mass block 1 to more effectively reduce the vibration of the inclined cable 5. When the inclined cable 5 is subjected to complex or random excitations such as longitudinal vibration, torsional vibration, lateral vibration and combined vibration, which are external excitations that make the vibration direction of the inclined cable 5 random, the connecting spring 4 in the annular mass block 1 can provide a dynamic restoring force to the inclined cable 5 to help the inclined cable 5 maintain stability. The damper 32 can smooth these dynamic responses and reduce the large fluctuations in vibration caused by changes in excitation.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An annular nonlinear energy sink device for reducing the vibration of a cable of a cable-stayed bridge, comprising a cable (5), characterized in that: A mounting mechanism (2) is installed in the middle of the inclined cable (5), an annular mass block (1) is provided on the outside of the mounting mechanism (2), a plurality of vibration damping members (3) are fixedly installed on the inside of the annular mass block (1), a plurality of connecting springs (4) located on one side of the vibration damping member (3) are fixedly installed on the annular mass block (1), the plurality of vibration damping members (3) each comprise a first positioning rod (31), a damper (32) and a second positioning rod (33), one end of the first positioning rod (31) is fixedly connected to one end of the damper (32), the other end of the damper (32) is fixedly connected to one end of the second positioning rod (33), the mounting mechanism (2) comprises a first mounting shell (21) and a second mounting shell (25), two ends of one side of the first mounting shell (21) are respectively in contact with two ends of one side of the second mounting shell (25), and four mounting holes (23) arranged in a rectangular shape are provided on the surface of the first mounting shell (21) and the surface of the second mounting shell (25).

2. The annular nonlinear energy sink device for reducing cable vibration of a cable-stayed bridge according to claim 1, characterized in that: One end of the first positioning rod (31) away from the damper (32) is fixedly connected to the annular mass block (1), and one end of the second positioning rod (33) away from the damper (32) is fixedly connected to the mounting mechanism (2).

3. The annular nonlinear energy sink device for reducing cable vibration of a cable-stayed bridge according to claim 1, characterized in that: The ends of the plurality of connection springs (4) that are away from the annular mass block (1) are fixedly connected to the side directly opposite to the mounting mechanism (2).

4. The annular nonlinear energy sink device for reducing cable vibration of a cable-stayed bridge according to claim 1, characterized in that: A fixing bolt (22) is threadedly connected between every two of the mounting holes (23), and locking nuts (24) are threadedly connected on the surfaces of the four fixing bolts (22).

5. The annular nonlinear energy sink device for reducing cable vibration of a cable-stayed bridge according to claim 1, characterized in that: The middle portion of one side of the first installation shell (21) and the middle portion of one side of the second installation shell (25) are both in contact and connected with the side directly opposite to the inclined cable (5).

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