A vortex-induced vibration disturbance device, system and method for a split steel box girder

Abstract

The present invention discloses a flow spoiler device, system and method for vortex-induced vibration of a split steel box girder. The flow spoiler device includes a dual-rotor motor fixed between two transverse connecting beams. Both output ends of the dual-rotor motor are provided with blades. The two blades are arranged along the vertical direction of the two transverse connecting beams. The two blades are arranged between the transverse connecting beams through the flow spoiler device. The flow spoiler device generates corresponding airflow through the operation, disrupting the airflow flowing through the bridge, thereby suppressing the airflow flowing through the bridge from generating alternating vortices, thereby suppressing the vortex-induced vibration of the bridge or other vibration phenomena caused by the airflow.

Description

Technical Field

[0001] The present invention relates to a flow spoiler device, in particular to a flow spoiler device, system and method for vortex-induced vibration of a split steel box girder, which are applied in the technical field of wind resistance of bridges. Background Art

[0002] The split steel box girder is one of the common main beam forms for large-span bridges. Due to its good load-bearing performance and light weight, it is widely used in large-span bridges such as the Humen Bridge and the Xihoumen Bridge. However, due to its unique aerodynamic shape, the split steel box girder is very prone to vortex-induced vibration. Vortex-induced vibration is a wind-induced vibration. When air flows through an obstacle, under certain conditions, alternating vortices are generated on the leeward side of the obstacle, causing the obstacle to vibrate. In recent years, vortex-induced vibration has occurred in the Xihoumen Bridge and the Humen Bridge.

[0003] Existing split steel box girders are divided into two bridge decks, one on each side, connected by a transverse tie beam. A transverse tie beam is arranged at regular intervals, connecting the two decks together. Split steel box girders effectively reduce the weight of the bridge's main beam while ensuring its rigidity, and are widely used on long-span bridges. However, due to their high flexibility and low damping ratio, long-span steel bridges are subject to large amplitudes of vortex-induced vibration. For example, in windy conditions with special cross-sectional forms, air vortices can easily form behind the windward deck and between the left and right decks. These vortices act on the leeward deck, causing vertical vibrations in the bridge's main beam, ultimately driving vortex-induced vibrations throughout the entire bridge. Furthermore, the leeward deck may be affected by other types of wake turbulence from the windward deck or by its unique aerodynamic shape, potentially leading to other wind-induced vibrations. This can easily cause public concern and lead to material fatigue damage and impact traffic safety. Summary of the Invention

[0004] In response to the above-mentioned problem that the split steel box girder is prone to vortex-induced vibration during use, which easily causes material fatigue damage and affects driving safety, the present invention provides a spoiler device, system and method for vortex-induced vibration of the split steel box girder. The spoiler device is arranged between the transverse connecting beams. The spoiler device generates corresponding airflow through the operation to disrupt the airflow flowing through the bridge, thereby suppressing the airflow flowing through the bridge from generating alternating vortices, thereby suppressing the vortex-induced vibration of the bridge or other vibration phenomena caused by the airflow.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a spoiler device for vortex-induced vibration of a split steel box girder, the spoiler device includes a dual-rotor motor fixed between two transverse connecting beams, and blades are provided at both output ends of the dual-rotor motor, and the two blades are arranged along the vertical direction of the two transverse connecting beams.

[0006] Furthermore, the two blades are arranged in opposite directions.

[0007] Furthermore, the dual-rotor motor includes a casing, in which a first rotor and a second rotor are provided, each of the first rotor and the second rotor is provided with one or more permanent magnet groups, the connecting end of the first rotor is connected to the connecting end of the second rotor through a rotating assembly, the first rotor and the second rotor are capable of rotating relative to each other, the output end of the first rotor is rotationally connected to the casing, the output end of the second rotor is rotationally connected to the casing, a stator is provided on the inner side of the casing at a position corresponding to the permanent magnet group, the stator is wound with coils, and position sensors are distributed between the coils.

[0008] Furthermore, the rotating assembly includes an outer rotating shaft and an inner rotating shaft, the outer rotating shaft and the inner rotating shaft are rotationally connected, one end of the outer rotating shaft is fixedly connected to the connecting end of the first rotor, and one end of the inner rotating shaft is fixedly connected to the connecting end of the second rotor.

[0009] Furthermore, a connecting cavity is provided on one end of the outer rotating shaft, the inner rotating shaft is placed in the connecting cavity, the other end of the outer rotating shaft is fixedly connected to the connecting end of the first rotor, and the end of the inner rotating shaft away from the first rotor is fixedly connected to the connecting end of the second rotor.

[0010] Furthermore, the outer rotating shaft and the inner rotating shaft are connected by one or more bearings; the connecting end of the second rotor is placed in the connecting cavity of the outer rotating shaft, and a connecting platform distributed circumferentially of the second rotor is provided on the connecting end of the second rotor toward the connection between the second rotor and the outer rotating shaft, and one or more first balls are provided on the connecting platform, and a circular sliding groove is provided on the outer rotating shaft corresponding to the position of the first ball, and the first ball is placed in the sliding groove; one or more second balls are provided on the end surface of one end of the inner rotating shaft placed in the connecting cavity of the outer rotating shaft, and a concave point is provided on the outer rotating shaft corresponding to the position of the second ball.

[0011] Furthermore, the first rotor and the second rotor are each provided with two or more permanent magnet groups, and the permanent magnets between the permanent magnet groups are staggered.

[0012] Furthermore, the casing is provided with a through hole, the first rotor and the second rotor are both hollow cylinders, and the first rotor and the second rotor are each provided with one or more heat dissipation holes; the heat dissipation holes include first heat dissipation holes arranged along the circumference of the hollow cylinder and second heat dissipation holes arranged along the axial direction of the hollow cylinder, and the second heat dissipation holes are located between the two permanent magnets; and heat dissipation blades are provided in the hollow cylinders of the first rotor and the second rotor.

[0013] The present invention also adopts a technical solution to solve its technical problems: a split steel box girder vortex-induced vibration control system, the control system includes a control module, a detection module and the above-mentioned spoiler device, the detection module is installed on the transverse connecting beam, the detection module is used to detect bridge vibration and send the detection data to the control module, and the control module controls the operation of the spoiler device according to the detection data.

[0014] The present invention also adopts a technical solution to solve the technical problem: a method for controlling vortex-induced vibration of a split steel box girder using the above-mentioned vortex-induced vibration control system for the split steel box girder, the method comprising the following steps:

[0015] S1. The detection module obtains the detection data of the bridge vibration and sends the detection data to the control module;

[0016] S2, the control module controls the start-up of the spoiler device according to the detection data;

[0017] S3. The detection module compares the detection data of the two endpoint values ​​within a time period in real time and adjusts the operation of the spoiler.

[0018] Beneficial effects of the present invention: The present invention provides a spoiler device, system and method for vortex-induced vibration of a split steel box girder, which is arranged between the transverse connecting beams through the spoiler device. The spoiler device generates corresponding airflow through the operation to disrupt the airflow flowing through the bridge, thereby suppressing the airflow flowing through the bridge from generating alternating vortices, thereby suppressing the vortex-induced vibration of the bridge or other vibration phenomena caused by the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an implementation diagram of the spoiler provided by the present invention;

[0020] Figure 2 1 is a schematic structural diagram of the spoiler device provided by the present invention;

[0021] Figure 3 Schematic diagram of the structure of the dual-rotor motor provided by the present invention;

[0022] Figure 4 Schematic diagram of the rotor structure of the dual-rotor motor provided by the present invention;

[0023] Figure 5 1 is a schematic cross-sectional view of the dual-rotor motor provided by the present invention;

[0024] Figure 6 It is a structural schematic diagram of the rotating assembly provided by the present invention;

[0025] Figure 7 It is a partial structural schematic diagram of the rotating assembly provided by the present invention;

[0026] Figure 8 It is a schematic structural diagram of the spoiler provided by the present invention.

[0027] Figure numerals: 1-housing, 101-through hole, 11-first rotor, 12-second rotor, 13-permanent magnet group, 131-permanent magnet, 14-stator, 141-coil, 142-position sensor, 15-rotating assembly, 151-outer shaft, 1511-connecting cavity, 152-inner shaft, 1521-connecting platform, 153-bearing, 154-first ball, 155-slide, 156-second ball, 16-heat dissipation hole, 161-first heat dissipation hole, 162-second heat dissipation hole, 17-heat dissipation blade, 2-blade, 3-transverse connecting beam, 4-bridge, 5-protective cover. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] See also Figure 1-8 The present invention provides a vortex-induced vibration (VIV) spoiler device for a split steel box girder. The spoiler device comprises a dual-rotor motor fixed between two transverse connecting beams 3. The dual-rotor motor is fixed to the transverse connecting beams 3 via a bracket, a connecting rod, etc. The dual-rotor motor is arranged along the vertical direction of the bridge 4. The two output ends of the dual-rotor motor are each provided with a blade 2. The two blades 2 are arranged along the vertical direction of the two transverse connecting beams 3. The two output ends of the dual-rotor motor can rotate in the same direction or in opposite directions, that is, four modes of rotation, namely clockwise-counterclockwise, double clockwise, double counterclockwise, and counterclockwise-clockwise, can be achieved, as well as different speed matching. In a specific embodiment, the spoiler device is arranged between the transverse connecting beams. For example, when VIV occurs in the bridge, the spoiler device generates a corresponding airflow, disrupting the airflow passing through the bridge, thereby suppressing the generation of alternating vortices in the airflow passing through the bridge, thereby suppressing VIV or other vibration phenomena caused by the airflow. At the same time, when the spoiler device is not required to be activated and there is sufficient wind energy, the spoiler device can also collect wind energy. When collecting wind energy, in the wind flow field, the wind energy drives the blades to rotate in the opposite direction. At this time, the dual-rotor motor rotates in the opposite direction, and the internal permanent magnets cut the magnetic lines of force to generate electrical energy. The electrical energy is output through the terminal to realize energy collection.

[0030] In this embodiment, facing airflows in different directions, the two blades 2 are preferably set in opposite directions. For example, when the dual-rotor motor rotates clockwise, the two blades 2 respectively cause the air to flow upward and downward. In specific implementation, blades in the same direction can also be used, and the angles of the blades can be inconsistent. By adjusting the angle, the airflow range of its action can be larger to better suppress vortex vibration of the bridge. The specific adjustment is made according to the actual application environment.

[0031] In this embodiment, two protective covers 5 are provided on the dual-rotor motor, and both protective covers 5 are opened downward, so that water will not enter the dual-rotor motor, and rainwater will not erode the internal components of the structure. The protective covers 5 are upper and lower protective covers. The upper protective cover is arranged on the rotor above the dual-rotor motor, and the lower end of the upper protective cover is lower than the lowest point of the upper output end of the dual-rotor motor, so that rainwater does not erode into the interior. The lower protective cover is integrated on the casing 1 of the dual-rotor motor, so that rainwater from top to bottom does not enter the interior of the dual-rotor motor.

[0032] In a specific implementation, the dual-rotor motor includes a casing 1, in which a first rotor 11 and a second rotor 12 are provided. The first rotor 11 and the second rotor 12 are both provided with one or more permanent magnet groups 13, and the permanent magnets can be 8 or 16 in a group, etc. The connecting end of the first rotor 11 is connected to the connecting end of the second rotor 12 by a rotating assembly 15, and the first rotor 11 and the second rotor 12 can rotate relative to each other. The output end of the first rotor 11 is rotatably connected to the casing 1, and the output end of the second rotor 12 is rotatably connected to the casing 1, wherein the first rotor 11 is preferably The output ends of the first rotor 11 and the second rotor 12 are connected to the casing 1 through bearings. The first rotor 11 and the second rotor 12 can rotate relative to the casing 1. A stator 14 is provided on the inner side of the casing 1 at a position corresponding to the permanent magnet group 13. The stator 14 is wound with a coil 141 and a position sensor 142 distributed between the coils 141. In this way, the two output shafts of the dual-rotor motor are independent of each other, so that the two output shafts can output independently without interfering with each other, and at the same time realize four modes of rotation of clockwise-counterclockwise, double clockwise, double counterclockwise, and counterclockwise-clockwise, as well as different speed matching.

[0033] In this embodiment, the rotating assembly 15 includes an outer rotating shaft 151 and an inner rotating shaft 152. The outer rotating shaft 151 and the inner rotating shaft 152 are rotationally connected, that is, the outer rotating shaft 151 and the inner rotating shaft 152 rotate independently of each other. One end of the outer rotating shaft 151 is fixedly connected to the connecting end of the first rotor 11, and one end of the inner rotating shaft 152 is fixedly connected to the connecting end of the second rotor 12. In a specific implementation, a connecting cavity 1511 is provided at one end of the outer rotating shaft 151, and the inner rotating shaft 152 is placed in the connecting cavity 1511. The other end of the outer rotating shaft 151 is fixedly connected to the connecting end of the first rotor 11, and the end of the inner rotating shaft 152 away from the first rotor 11 is fixedly connected to the connecting end of the second rotor 12. In short, in a specific implementation, a universal ball structure can also be used for rotational connection with the connecting end of the second rotor 12. The specific structure is not limited, as long as the outer rotating shaft 151 and the inner rotating shaft 152 can rotate independently of each other.

[0034] In this embodiment, the outer rotating shaft 151 and the inner rotating shaft 152 are connected by more than one bearing 153 to increase the lateral force between the outer rotating shaft 151 and the inner rotating shaft 152. Preferably, two bearings 153 are used on one side to ensure stability.

[0035] Furthermore, the connecting end of the second rotor 12 is placed in the connecting cavity 1511 of the outer shaft 151, and a connecting platform 1521 is provided on the connecting end of the second rotor 12 toward the connection between the second rotor 12 and the outer shaft 151. In short, a connecting platform 1521 is provided on the second rotor 12. Figure 7 As shown, one or more first balls 154 are provided on the connecting platform 1521 , and a circular sliding groove 155 is provided on the outer shaft 151 corresponding to the position of the first balls 154 . The first balls 154 are placed in the sliding groove 155 to increase the longitudinal force between the second rotor 12 and the outer shaft 151 .

[0036] Furthermore, the inner shaft 152 is placed on the end surface of one end of the connecting cavity 1511 of the outer shaft 151, and one or more second balls 156 are provided. The outer shaft 151 is provided with a concave point (not marked in the figure) at the position corresponding to the second ball 156, which increases the longitudinal force of the inner shaft 152 and the outer shaft 151. The above structure ensures that the rotating assembly 15 rotates smoothly, and at the same time makes its internal structure compact, realizing multi-point force and multi-directional force, thereby ensuring the stability of the dual-rotor motor during operation.

[0037] In this embodiment, the first rotor 11 and the second rotor 12 are each provided with two or more permanent magnet groups 13, and the permanent magnets 131 between the permanent magnet groups 13 are staggered. The use of multiple permanent magnet groups 13 makes the dual-rotor motor smoother during operation. It can also use one permanent magnet group 13 composed of multiple permanent magnets 131, but the volume of the dual-rotor motor is too large, and its cost is higher than that of a dual-rotor motor composed of multiple permanent magnet groups 13. It should be noted that Figure 4 and Figure 5 The white color in the middle represents the N-level magnet, and the black color represents the S-level magnet. The magnetic poles are arranged alternately. There is no unique arrangement, and the figure only represents one permanent magnet arrangement.

[0038] In this embodiment, a through hole 101 is provided on the casing 1, and the first rotor 11 and the second rotor 12 are both hollow cylinders. The first rotor 11 and the second rotor 12 are both provided with one or more heat dissipation holes 16 to solve the problem of heat accumulation and heat dissipation inside the motor; further, the heat dissipation holes 16 include first heat dissipation holes 161 arranged along the circumference of the hollow cylinder and second heat dissipation holes 162 arranged along the axial direction of the hollow cylinder, the second heat dissipation holes 162 are located between the two permanent magnets 131, and the second heat dissipation holes 162 are adjusted for the permanent magnet group 13; further, heat dissipation blades 17 are provided in the hollow cylinders of the first rotor 11 and the second rotor 12, and heat is further dissipated through the heat dissipation blades 17.

[0039] The present invention also provides a split-type steel box girder vortex-induced vibration control system, which includes a control module, a detection module, and the above-mentioned spoiler device. The detection module is installed on the transverse connecting beam, and the detection module is a vibration sensor. The detection module is used to detect bridge vibration. At the same time, a wind speed tester or the like can be installed on the bridge to detect wind speed and wind direction. The detection module sends the detection data to the control module, and the control module controls the spoiler device according to the detection data. That is, the reaction force generated by the spoiler device caused by the blades 2 rotating the air can be used to reduce the vibration of the bridge. In a specific implementation, for example, when the bridge 2 structure moves upward, the upper rotor of the dual-rotor motor drives the upper blade 2 to work, giving the bridge 2 a downward reaction force. When the bridge 2 moves downward, the lower rotor of the dual-rotor motor drives the lower blade 2 to work, giving the bridge 2 an upward reaction force. When the structure vibrates periodically, the control module can control the spoiler device in combination with the data transmitted by the vibration sensor to transform it into a damper.

[0040] The present invention also provides a method for controlling vortex-induced vibration of a split steel box girder using the above-mentioned vortex-induced vibration control system for the split steel box girder, comprising the following steps:

[0041] S1. The detection module obtains the detection data of the bridge vibration and sends the detection data to the control module.

[0042] S2. The control module activates the spoiler device based on the detected data. A trigger value is set within the control module. When the detected data value is higher than the trigger value, the control module activates the spoiler device. When the detected data value is lower than the trigger value, the control module deactivates the spoiler device. Simultaneously, the control module activates the corresponding output terminals and speeds of the dual-rotor motor based on the detected wind speed and direction.

[0043] S3. The detection module compares the detection data of the two endpoint values ​​within a time period in real time and adjusts the operation of the spoiler. In specific implementation, a time period can be 1 minute, 3 minutes, 10 minutes, etc., which is set according to the usage. For example, when the spoiler is working, if the bridge vibration does not decrease or increases at the two point values ​​in the 1-minute time period, it can increase the speed of the dual-rotor motor and compare again to see whether the bridge vibration is reduced. The whole process forms a process of comparison-regulation-re-comparison, so that the bridge vibration is finally close to the acceptable value range.

[0044] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A vortex-induced vibration spoiler for a split steel box girder, characterized in that: The spoiler device comprises a dual-rotor motor fixed between two transverse connecting beams (3), wherein both output ends of the dual-rotor motor are provided with blades (2), and the two blades (2) are arranged along the vertical direction of the two transverse connecting beams (3); The dual-rotor motor comprises a housing (1), wherein a first rotor (11) and a second rotor (12) are provided in the housing (1), and each of the first rotor (11) and the second rotor (12) is provided with one or more permanent magnet groups (13), a connecting end of the first rotor (11) and a connecting end of the second rotor (12) are connected via a rotating assembly (15), and the first rotor (11) and the second rotor (12) are capable of rotating relative to each other, an output end of the first rotor (11) is rotationally connected to the housing (1), and an output end of the second rotor (12) is rotationally connected to the housing (1), and a stator (14) is provided on the inner side of the housing (1) at a position corresponding to the permanent magnet group (13), and a coil (141) is wound on the stator (14), and position sensors (142) are distributed between the coils (141); The housing (1) is provided with a through hole (101); the first rotor (11) and the second rotor (12) are both hollow cylinders; the first rotor (11) and the second rotor (12) are both provided with one or more heat dissipation holes (16); the heat dissipation holes (16) include first heat dissipation holes (161) arranged along the circumference of the hollow cylinder and second heat dissipation holes (162) arranged along the axial direction of the hollow cylinder; the second heat dissipation holes (162) are located between the two permanent magnets (131); and heat dissipation blades (17) are provided in the hollow cylinders of the first rotor (11) and the second rotor (12).

2. The vortex-induced vibration spoiler device for a split steel box girder according to claim 1, characterized in that: The two blades (2) are arranged in opposite directions.

3. The vortex-induced vibration spoiler device for a split steel box girder according to claim 1, characterized in that: The rotating assembly (15) comprises an outer rotating shaft (151) and an inner rotating shaft (152), wherein the outer rotating shaft (151) and the inner rotating shaft (152) are rotatably connected to each other, one end of the outer rotating shaft (151) is fixedly connected to the connecting end of the first rotor (11), and one end of the inner rotating shaft (152) is fixedly connected to the connecting end of the second rotor (12).

4. The vortex-induced vibration spoiler device for a split steel box girder according to claim 3, characterized in that: A connecting cavity (1511) is provided on one end of the outer rotating shaft (151), the inner rotating shaft (152) is placed in the connecting cavity (1511), the other end of the outer rotating shaft (151) is fixedly connected to the connecting end of the first rotor (11), and the end of the inner rotating shaft (152) away from the first rotor (11) is fixedly connected to the connecting end of the second rotor (12).

5. The vortex-induced vibration spoiler device for a split steel box girder according to claim 4, characterized in that: The outer rotating shaft (151) and the inner rotating shaft (152) are connected via one or more bearings (153); the connecting end of the second rotor (12) is placed in the connecting cavity (1511) of the outer rotating shaft (151); a connecting platform (1521) distributed circumferentially of the second rotor (12) is provided on the connecting end of the second rotor (12) toward the connection between the second rotor (12) and the outer rotating shaft (151); one or more first balls (154) are provided on the connecting platform (1521); a circular sliding groove (155) is provided on the outer rotating shaft (151) at a position corresponding to the first balls (154); the first balls (154) are placed in the sliding groove (155); one or more second balls (156) are provided on the end surface of one end of the inner rotating shaft (152) placed in the connecting cavity (1511) of the outer rotating shaft (151); a concave point is provided on the outer rotating shaft (151) at a position corresponding to the second balls (156).

6. The vortex-induced vibration spoiler device for a split steel box girder according to claim 1, characterized in that: The first rotor (11) and the second rotor (12) are both provided with two or more permanent magnet groups (13), and the permanent magnets (131) between the permanent magnet groups (13) are arranged in an alternating manner.

7. A split steel box girder vortex-induced vibration control system, characterized in that: The control system includes a control module, a detection module and a spoiler according to any one of claims 1 to 6, wherein the detection module is installed on the transverse connecting beam, the detection module is used to detect bridge vibration and send the detection data to the control module, and the control module controls the operation of the spoiler according to the detection data.

8. A method for controlling vortex-induced vibration of a split steel box girder using the vortex-induced vibration control system of the split steel box girder according to claim 7, characterized in that: The method comprises the following steps: S1. The detection module obtains the detection data of the bridge vibration and sends the detection data to the control module; S2. The control module starts the spoiler device according to the detection data; S3. The detection module compares the detection data of the two endpoint values ​​within a time period in real time and adjusts the operation of the spoiler.

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