Active vibration suppression device for wind-induced vortex-induced vibration

Abstract

This invention discloses an active vibration suppression device for wind-induced vortex-induced vibration, comprising an air inlet, an air compressor, an air supply duct, an inner ventilation pipe, an outer ventilation pipe, and an exhaust device. The inner ventilation pipe is mounted inside the outer ventilation pipe via a bearing. The air inlet is located on the bridge body, with its input end situated on the side of the bridge body and its output end located on the upper or lower surface of the bridge body and connected to the input end of the air compressor. The output end of the air compressor is connected to the air supply duct, the other end of which is inserted into the bridge body and connected to the inner ventilation pipe via a bearing. The output end of the inner ventilation pipe extends out of the bridge body and is connected to the exhaust device. The exhaust device includes an exhaust manifold, an exhaust pipe, and guide vanes. The exhaust pipe is a curved pipe, and the guide vanes are disposed on the side wall of the exhaust pipe. This invention can efficiently and actively suppress wind-induced vortex-induced vibration in bridges, providing technical support for ensuring bridge safety.

Description

Technical Field

[0001] This invention relates to the field of bridge safety technology, and in particular to an active vibration suppression device for wind-induced vortex-induced vibration. Background Technology

[0002] Modern elastically supported structures are highly sensitive to wind and significantly affected by it. Bridges, as typical elastically supported structures, frequently experience vortex-induced vibration. Vortex-induced vibration in bridges is a wind-induced vibration characterized by self-excitation and amplitude limitation, caused by the alternating shedding of vortices generated as airflow passes over the bridge structure. This vibration can lead to fatigue failure of the bridge structure, adversely affecting the bridge itself and pedestrians. Therefore, appropriate measures are needed to reduce vortex-induced vibration in bridges.

[0003] When a bridge experiences vortex-induced vibration, it will have different vibration frequencies, including the 0-1st order mode, the 1st order mode, the 2nd order mode, the 3rd order mode, and so on, up to the Nth order mode. Depending on the mode of vibration, the location and form of the vibration damping device installed on the bridge will also be different. It is usually installed at the point where the amplitude of the corresponding mode of vibration is the largest.

[0004] Currently, to reduce the frequency of bridge vibrations, most methods employ vortex-induced vibration control mechanisms or improvements to bridge segmental structures, primarily using passive or semi-active vibration suppression devices. However, existing passive or semi-active vibration suppression devices are not very effective, and bridges experiencing vortex-induced vibration exhibit different vibration frequencies, including 0-1 order modes, 1st order mode, 2nd order mode, 3rd order mode, and so on up to Nth order modes. Different installation locations and forms of vibration suppression devices are required depending on the specific mode of vibration. Therefore, there is an urgent need for a more effective wind-induced vortex-induced vibration suppression device. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide an active vibration suppression device for wind-induced vortex-induced vibration.

[0006] The technical solution of the present invention is as follows:

[0007] An active vibration suppression device for wind-induced vortex-induced vibration includes an air inlet, an air compressor, an air delivery duct, an inner ventilation pipe, an outer ventilation pipe, and an exhaust device. The inner ventilation pipe is installed inside the outer ventilation pipe via a bearing.

[0008] The air inlet is located on the main body of the bridge. The input end of the air inlet is located on the side of the main body of the bridge, and the output end of the air inlet is located on the upper or lower surface of the main body of the bridge and is connected to the input end of the air compressor through a pipe.

[0009] The output end of the air compressor is connected to the input end of the air duct. The other end of the air duct is inserted into the bridge body and connected to the input end of the ventilation inner pipe through bearing two. The output end of the ventilation inner pipe passes through the bridge body and is connected to the input end of the exhaust device.

[0010] The exhaust device includes an exhaust manifold, an exhaust pipe, and a guide vane. One end of the exhaust manifold is connected to the output end of the ventilation inner pipe, and the other end of the exhaust manifold is closed. The exhaust pipe is a curved pipe, and multiple pipes are evenly arranged around the side wall of the exhaust manifold. The end of the exhaust pipe is provided with an air jet. The guide vane is arranged on the side wall of the exhaust pipe.

[0011] Preferably, multiple air inlets are provided and are evenly distributed around the ventilation duct.

[0012] Preferably, two bearings are provided, one on the left and one on the right side of the inner wall of the ventilation outer pipe.

[0013] Preferably, two sealing rings are provided between the outer ventilation pipe and the inner ventilation pipe, with one sealing ring being adjacent to the right side of the bearing located on the left side, and the other sealing ring being adjacent to the left side of the bearing located on the right side.

[0014] Preferably, the output end of the air supply duct includes a cylindrical section one, a conical section and a cylindrical section two connected in sequence. The inner diameter of the cylindrical section one is larger than the inner diameter of the cylindrical section two, and the inner diameter of the cylindrical section two is smaller than the inner diameter of the ventilation inner pipe and is connected to the ventilation inner pipe through the bearing two.

[0015] Preferably, the output end of the ventilation inner pipe is flared.

[0016] Preferably, the exhaust pipe includes a straight pipe I, a bend, a straight pipe II, and a tapered pipe connected in sequence. The input end of the straight pipe I is connected to the exhaust manifold, and the end of the tapered pipe with the larger inner diameter is connected to the straight pipe II.

[0017] Preferably, the drainage blade is composed of a straight surface, an arc surface one, an arc surface two, and an arc surface three. The straight surface and the arc surface three are connected at their ends. The arc surface one and the arc surface two are arranged opposite each other and share an edge with the straight surface and the arc surface three. The arc surface three protrudes in the direction of the concavity of the bend pipe, and the arc surface one and the arc surface two are concave in the direction of approaching the ventilation inner pipe.

[0018] Preferably, the drainage blade has a larger blade area in the direction closer to the bend.

[0019] Preferably, the pressure value adjusted by the air compressor is determined by the following formula:

[0020]

[0021] In the formula: P is the regulating pressure of the air compressor; f is the natural frequency of the beam segment vibration; D is the height of the main beam; ρ is the atmospheric density; A is the nozzle area of ​​the exhaust pipe; B is the width of the main beam; α is the bend angle of the exhaust pipe.

[0022] The beneficial effects of this invention are:

[0023] This invention enables the inner ventilation pipe to rotate relative to the outer ventilation pipe and the air supply pipe through bearing one and bearing two. By providing an exhaust device connected to the inner ventilation pipe, the exhaust device, which is configured as a curved exhaust pipe, and the guide vanes on the exhaust pipe, can actively rotate when there is wind. This disrupts the original flow field around the bridge, significantly reducing vortex-induced vibration and ultimately ensuring the long-term stable operation of the bridge, thus providing certain social benefits. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the installation of the wind-induced vortex-induced vibration active damping device of the present invention on the main body of a bridge, as shown in a specific embodiment.

[0026] Figure 2 This is a three-dimensional structural schematic diagram of the active vibration suppression device for wind-induced vortex-induced vibration of the present invention;

[0027] Figure 3 This is a schematic diagram of the right side of the active vibration suppression device for wind-induced vortex-induced vibration of the present invention.

[0028] Figure 4 This is a schematic diagram of the main structure of the active vibration suppression device for wind-induced vortex-induced vibration of the present invention.

[0029] Figure 5 This is a schematic diagram of the exhaust pipe structure of the active vibration suppression device for wind-induced vortex-induced vibration of the present invention.

[0030] Numbering in the diagram: 1-Bridge main body, 2-Air inlet, 3-Exhaust device, 4-Outer ventilation pipe, 5-Inner ventilation pipe, 6-Cone section, 7-Air supply pipe, 8-Bearing 1, 9-Sealing ring, 10-Exhaust pipe, 11-Air jet nozzle, 12-Drainage blade. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and technical features described in this application can be combined with each other. It should also be pointed out that, unless otherwise indicated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] In this invention, unless otherwise stated, the terms "first," "second," etc., are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that the terms used in this way generally refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner," "outer," etc., refer to the inner and outer contours relative to the individual components. However, the aforementioned directional terms are not intended to limit the invention. The terms "comprising" or "including," etc., as used in this invention, mean that the element or object preceding the word encompasses the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0033] like Figure 1-5 As shown, the present invention provides an active vibration suppression device for wind-induced vortex-induced vibration, including an air inlet 2, an air compressor (not shown in the figure), an air supply pipe 7, an inner ventilation pipe 5, an outer ventilation pipe 4, and an exhaust device 3. The inner ventilation pipe 4 is installed inside the outer ventilation pipe 4 through a bearing 8.

[0034] The air inlet 2 is provided on the bridge body 1. The input end of the air inlet 2 is located on the side of the bridge body 1, and the output end of the air inlet 2 is located on the upper or lower surface of the bridge body 1 and is connected to the input end of the air compressor through a pipe.

[0035] The output end of the air compressor is connected to the input end of the air duct 7. The other end of the air duct 7 is inserted into the bridge body 1 and connected to the input end of the ventilation inner pipe 5 through the bearing 2. The output end of the ventilation inner pipe 5 passes through the bridge body 1 and is connected to the input end of the exhaust device 3.

[0036] The exhaust device 3 includes an exhaust manifold, an exhaust pipe 10, and a guide vane 12. One end of the exhaust manifold is connected to the output end of the ventilation inner pipe 5, and the other end of the exhaust manifold is closed. The exhaust pipe 10 is a curved pipe, and multiple pipes are evenly arranged around the side wall of the exhaust manifold. The end of the exhaust pipe 10 is provided with a jet nozzle 11. The guide vane 12 is arranged on the side wall of the exhaust pipe 10.

[0037] In the above embodiments, on the one hand, by setting the guide vane 12, the wind-induced vortex-induced vibration active vibration suppression device of the present invention can drive the exhaust device 3 and the ventilation inner pipe 5 to rotate actively when encountering wind, thereby actively suppressing vibration; on the other hand, by setting the air inlet 2, air compressor, and air supply pipe 7, when there is wind, the air entering the bridge body 1 is compressed and transmitted from the ventilation inner pipe 5 to the exhaust device 3, and discharged through the exhaust pipe 10 set in the exhaust device 3 in a bent shape, so that the exhaust pipe 10 can rotate, disrupting the airflow field, thereby suppressing wind-induced vortex-induced vibration.

[0038] In one specific embodiment, multiple air inlets 2 are provided and are evenly distributed around the ventilation outer pipe 4.

[0039] In one specific embodiment, two bearings 8 are provided, respectively located on the left and right sides of the inner wall of the outer ventilation pipe 4. Optionally, two sealing rings 9 are also provided between the outer ventilation pipe 4 and the inner ventilation pipe 5, with one sealing ring 9 adjacent to the right side of the left bearing 8 and the other sealing ring 9 adjacent to the left side of the right bearing 8.

[0040] In one specific embodiment, the output end of the air supply duct 7 includes a cylindrical section 1, a tapered section 6, and a cylindrical section 2 connected in sequence. The inner diameter of the cylindrical section 1 is larger than the inner diameter of the cylindrical section 2, and the inner diameter of the cylindrical section 2 is smaller than the inner diameter of the ventilation inner pipe 5 and is connected to the ventilation inner pipe 5 through the bearing 2. In this embodiment, by setting the tapered section 6, the venturi effect it creates can be used to change the flow velocity and pressure of compressed air entering the ventilation inner pipe.

[0041] In one specific embodiment, the output end of the ventilation inner pipe 5 is funnel-shaped. In this embodiment, by setting the output end of the ventilation inner pipe 5 in a funnel shape, the ventilation volume entering the exhaust manifold can be increased.

[0042] In one specific embodiment, the exhaust pipe 10 includes a straight pipe I, a bend, a straight pipe II, and a tapered pipe connected in sequence. The input end of the straight pipe I is connected to the exhaust manifold, and the end of the tapered pipe with the larger inner diameter is connected to the straight pipe II. Optionally, the bend angle of the exhaust pipe (the angle between the straight pipe I and the straight pipe II) is in the range of 30° to 60°.

[0043] In one specific embodiment, the drainage blade 12 is composed of a straight surface, an arc-shaped surface one, an arc-shaped surface two, and an arc-shaped surface three. The straight surface and the arc-shaped surface three are connected end-to-end. The arc-shaped surface one and the arc-shaped surface two are arranged opposite each other and share an edge with the straight surface and the arc-shaped surface three. The arc-shaped surface three protrudes in the direction of the bend in the pipe, while the arc-shaped surface one and the arc-shaped surface two are recessed in the direction closer to the ventilation inner pipe. Optionally, the drainage blade 12 has a larger blade area in the direction closer to the bend in the pipe.

[0044] In one specific embodiment, the pressure value regulated by the air compressor is determined by the following formula:

[0045]

[0046] In the formula: P is the regulating pressure of the air compressor; f is the natural frequency of the beam segment vibration; D is the height of the main beam; ρ is the atmospheric density; A is the nozzle area of ​​the exhaust pipe; B is the width of the main beam; α is the bend angle of the exhaust pipe.

[0047] In one specific embodiment of the invention, when strong winds encounter the outside of the bridge, a wind pressure difference is generated on the bridge surface, causing some of the strong wind to enter the bridge body 1 through the air inlet 2. The air compressor absorbs the wind entering the bridge body 1, compresses it, and blows it through the air duct 7 to the ventilation inner pipe 5. Then, the compressed air is directed to the exhaust pipe 10 through the air outlet of the ventilation inner pipe 5. Finally, the exhaust pipe 10 discharges the air through the jet nozzle 11. Since multiple exhaust pipes 10 are equidistantly arranged on the outer wall of the exhaust collection pipe, the exhaust... During the process, the exhaust pipe 10 is driven to rotate at high speed (the rotation speed is related to the wind force encountered; the stronger the wind force encountered, the greater the rotation speed of the exhaust pipe 10). This causes the exhaust pipe 10 to dominate the airflow field around the structure in the form of a rotating nozzle, suppressing vortex-induced force and thus suppressing vortex-induced vibration. By setting the guide vane 12 on the back of the exhaust pipe 10, when facing the wind, the guide vane 12 can make the exhaust pipe 10 rotate actively and dominate the airflow. By actively controlling the airflow, the coordination of vortex-induced force is disrupted, the vortex-induced force is reduced, and thus vortex-induced vibration is suppressed.

[0048] In one specific embodiment, a wind speed sensor and a vibration sensor are installed on the air compressor. The working pressure of the air compressor is adjusted by detecting the wind speed, which can effectively save energy. The vibration sensor detects the amplitude of the bridge structure to start and stop the air compressor.

[0049] In one specific embodiment, the wind-induced vortex-induced vibration active damping device described in this invention is symmetrically arranged on the left and right sides of the bridge main body. Simultaneously, other damping devices are arranged under the same aerodynamic and vibration conditions to compare their damping effects. Specifically:

[0050] (1) Under the same aerodynamic and vibration conditions, the row of holes (air inlets are set on the same straight line) on the beam segment is 30% as effective as the annular holes (air inlets are uniformly arranged around the ventilation pipe) in the beam segment of the present invention in suppressing vortex-induced vibration. The design of the row of holes will affect the overall structural stability of the beam segment.

[0051] (2) Under the same aerodynamic and vibration conditions, the rotation efficiency of the vibration damping device with guide vanes installed on the curved exhaust pipe is 80% higher than that of the vibration damping device without guide vanes installed on the curved exhaust pipe. The amplitude of vortex-induced vibration of the beam segment is reduced by 60%, the maximum amplitude of the beam segment is reduced by 50%, and the overall structural stability is increased by 80%.

[0052] (3) Under the same aerodynamic and vibration conditions, the straight exhaust pipe with a steel structure damping ratio of 0.5, when equipped with guide vanes and rotated, has a wind suppression effect of 30% compared to the original beam section straight exhaust pipe; the curved exhaust pipe with a steel structure damping ratio of 0.5, when equipped with guide vanes and rotated, has a wind suppression effect of over 95% compared to the original beam section straight exhaust pipe.

[0053] (4) When a straight exhaust pipe is fitted with a guide vane, the vibration suppression effect of the vibration suppression device reaches 30%, but it cannot rotate actively and the operation of the vibration suppression device is unstable. When a curved exhaust pipe with a large bend (greater than 60°) and a small bend (less than 30°) is fitted with a guide vane, the vibration suppression effect of the vibration suppression device reaches 50%, but the vibration suppression device has a large dispersion. When a curved exhaust pipe with a bend of 30° to 60° is fitted with a guide vane, the vibration suppression effect of the vibration suppression device reaches 95%, which basically suppresses vortex-induced vibration, has good aerodynamic performance, and is stable in operation.

[0054] In summary, this invention can actively suppress vibration and achieve excellent vibration suppression effects. Compared with the prior art, this invention represents a significant advancement.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A wind-induced vortex-induced vibration active damping device, characterized in that, It includes an air inlet, an air compressor, an air duct, an inner ventilation pipe, an outer ventilation pipe, and an exhaust device. The inner ventilation pipe is installed inside the outer ventilation pipe via a bearing. The air inlet is located on the main body of the bridge. The input end of the air inlet is located on the side of the main body of the bridge, and the output end of the air inlet is located on the upper or lower surface of the main body of the bridge and is connected to the input end of the air compressor through a pipe. The output end of the air compressor is connected to the input end of the air duct. The other end of the air duct is inserted into the bridge body and connected to the input end of the ventilation inner pipe through bearing two. The output end of the ventilation inner pipe passes through the bridge body and is connected to the input end of the exhaust device. The exhaust device includes an exhaust manifold, an exhaust pipe, and a guide vane. One end of the exhaust manifold is connected to the output end of the ventilation inner pipe, and the other end of the exhaust manifold is closed. The exhaust pipe is a curved pipe, and multiple pipes are evenly arranged around the side wall of the exhaust manifold. The end of the exhaust pipe is provided with an air jet. The guide vane is arranged on the side wall of the exhaust pipe.

2. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 1, characterized in that, Multiple air inlets are provided and are evenly distributed around the ventilation duct.

3. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 1, characterized in that, Two bearings are provided, one on the left and one on the right side of the inner wall of the ventilation outer pipe.

4. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 3, characterized in that, Two sealing rings are provided between the outer ventilation pipe and the inner ventilation pipe, with one sealing ring being adjacent to the right side of the bearing located on the left, and the other sealing ring being adjacent to the left side of the bearing located on the right.

5. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 1, characterized in that, The output end of the air supply duct includes a cylindrical section one, a conical section and a cylindrical section two connected in sequence. The inner diameter of the cylindrical section one is larger than the inner diameter of the cylindrical section two. The inner diameter of the cylindrical section two is smaller than the inner diameter of the ventilation inner pipe and is connected to the ventilation inner pipe through the bearing two.

6. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 1, characterized in that, The output end of the ventilation inner pipe is flared.

7. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 1, characterized in that, The exhaust pipe includes a straight pipe I, a bend, a straight pipe II, and a tapered pipe connected in sequence. The input end of the straight pipe I is connected to the exhaust manifold, and the end of the tapered pipe with the larger inner diameter is connected to the straight pipe II.

8. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 7, characterized in that, The drainage blade is composed of a straight surface, an arc surface one, an arc surface two, and an arc surface three. The straight surface and the arc surface three are connected end to end. The arc surface one and the arc surface two are arranged opposite each other and share an edge with the straight surface and the arc surface three. The arc surface three protrudes in the direction of the concave bend of the pipe, and the arc surface one and the arc surface two are concave in the direction of the ventilation inner pipe.

9. The active vibration suppression device for wind-induced vortex-induced vibration according to claim 8, characterized in that, The drainage blade has a larger blade area in the direction closer to the bend.

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