A rotating plate device with adjustable air permeability

Abstract

The present invention discloses a rotating plate device with adjustable air permeability, including a rotating plate mechanism, the rotating plate mechanism including a plurality of rotating plate assemblies respectively arranged at both ends of the main beam in the transverse direction of the bridge and in the middle of the main beam, each rotating plate assembly including a plurality of rotating parts arranged along the main beam in the longitudinal direction of the bridge, each rotating part including a rotary motor, a base plate driven to rotate by the rotary motor, and a rotating plate fixedly connected to the base plate, and the rotating plate extending in the vertical direction. The present invention can actively adjust the posture of the rotating plate to adjust the air permeability according to the characteristics of different incoming winds, thereby improving the wind resistance of highway bridges in different wind environments; each rotating part can be independently controlled, and different angles can be set for rotating plates in different positions; it can not only be used as a railing, but also can actively adjust the aerodynamic performance of the bridge according to different wind environments, improve the vortex vibration and flutter performance of the bridge, and achieve an economical and practical effect; the rotating motor is powered by solar energy, and no additional external power supply is required.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge structures, and in particular to a rotating plate device with adjustable air permeability. Background Art

[0002] In recent years, with the continuous development of relevant technologies, the span of bridges has continued to increase. For long-span bridges, due to their slender appearance and flexible structure, they are extremely sensitive to the effects of wind. Flutter and vortex vibration are two types of wind-induced vibrations that have been widely studied in bridge engineering. They pose varying degrees of harm to the structure and function of bridges. Flutter is a dynamic instability phenomenon. When the ambient wind speed exceeds the critical flutter wind speed of the structure, the damping of the vibration system tends from positive to negative in the interaction between the bridge structure and the surrounding flow field. Negative damping further amplifies the vibration of the bridge, ultimately leading to structural collapse. Vortex vibration is a self-limiting vibration phenomenon with both self-excitation and forced characteristics. It is caused by the periodic shedding of vortices around the structure. Vortex vibration generally does not cause structural damage, but the wind speed at which it occurs is generally low. At the same time, vortex vibration with a large amplitude can cause driving safety problems and structural fatigue problems, so it also needs to be controlled.

[0003] Common vibration reduction measures can be categorized into three types: structural, aerodynamic, and mechanical. Structural measures optimize the aerodynamic characteristics of a structure. However, since they often require redesigning structural components, they are costly and generally cannot be applied to existing structures. Mechanical measures utilize mechanical devices to increase structural damping to achieve vibration suppression, but they often require a larger installation space and are costly. Pneumatic measures, which control bridge vibration by appropriately modifying the aerodynamic shape or adding flow-guiding devices, are currently the most widely used and economical method.

[0004] Currently, commonly used aerodynamic measures include installing guide plates and air nozzles. One of their common characteristics is that they are usually fixed at specific locations on the bridge structure, and their characteristics cannot be adjusted at any time during use. Existing studies have shown that the same aerodynamic measures have strong commonalities in some bridges, but show completely different results in other bridges. Therefore, different device characteristics need to be designed for different bridges. Moreover, due to the different characteristics of different flutter and vortex vibrations, fixed aerodynamic measure structures generally cannot simultaneously improve the flutter and vortex vibration performance of bridge structures. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide a rotating plate device with adjustable air permeability.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by one embodiment of the present invention is as follows:

[0007] A rotating plate device with adjustable air permeability includes a rotating plate mechanism, which includes a plurality of rotating plate assemblies respectively arranged at both ends of the main beam in the transverse direction and in the middle of the main beam, each of the rotating plate assemblies includes a plurality of rotating parts arranged along the main beam in the longitudinal direction, each of the rotating parts includes a rotating motor, a base plate driven to rotate by the rotating motor, and a rotating plate fixedly connected to the base plate, and the rotating plate extends in the vertical direction.

[0008] As a further improvement of the present invention, the output shaft of the rotary motor is connected to a supporting plate, a height adjusting member is provided on the supporting plate, and the height adjusting member cooperates with the base plate.

[0009] As a further improvement of the present invention, the height adjustment member includes at least two columns.

[0010] As a further improvement of the present invention, it further includes at least one stiffening plate, and the stiffening plates are fixedly connected to the rotating plate and the base plate respectively.

[0011] As a further improvement of the present invention, the stiffening plate is in the shape of a right triangle, the vertical right-angled side of the stiffening plate is fixedly connected to the rotating plate, and the horizontal right-angled side of the stiffening plate is fixedly connected to the base plate.

[0012] As a further improvement of the present invention, the substrate is disc-shaped.

[0013] As a further improvement of the present invention, the angle between the rotating plate and the transverse direction of the main beam is 0-90°.

[0014] As a further improvement of the present invention, when the rotating plates rotate to be parallel to the main beam along the bridge direction, two adjacent rotating plates abut against each other.

[0015] As a further improvement of the present invention, the rotating plate is a solar panel, and the rotating plate is electrically connected to the rotating motor.

[0016] As a further improvement of the present invention, the rotary motor is embedded in the main beam.

[0017] The beneficial effects of the present invention are:

[0018] (1) The air permeability can be adjusted by actively adjusting the posture of the rotating plate according to the characteristics of different incoming winds. The air permeability can be adjusted continuously, thereby accurately controlling the air permeability and improving the wind resistance of highway bridges in different wind environments.

[0019] (2) Each rotating part can be controlled independently, and different angles can be set for the rotating plates at different positions.

[0020] (3) It can not only be used as a railing, but also actively adjust the aerodynamic performance of the bridge according to different wind environments. It can improve the vortex vibration and flutter performance of the bridge without installing other wind-resistant components, achieving an economical and practical effect.

[0021] (4) Solar energy can be collected and converted into electrical energy to power the rotating motor without the need for additional external energy supply. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 is a front view of a preferred embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of a rotating member according to a preferred embodiment of the present invention;

[0025] Figure 3 is a front view of a rotating member of a preferred embodiment of the present invention;

[0026] Figure 4 is a side view of a rotating member of a preferred embodiment of the present invention;

[0027] Figure 5 is a schematic top view of the structure of a preferred embodiment of the present invention;

[0028] Figure 6 yes Figure 5 A is an enlarged schematic diagram;

[0029] Figure 7 This is a schematic diagram of the working state of the minimum air permeability of the preferred embodiment of the present invention;

[0030] Figure 8 2 is a schematic diagram of a working state of maximum air permeability of a preferred embodiment of the present invention;

[0031] Figure 9 Schematic diagram of the working state of the semi-air permeability of the preferred embodiment of the present invention;

[0032] Figure 10 Schematic diagram of the working state of the staggered air permeability of the preferred embodiment of the present invention;

[0033] Figure 11 is a diagram showing the results of a flutter wind tunnel test of a preferred embodiment of the present invention;

[0034] In the figure: 1. Main beam, 2. Rotating plate assembly, 3. Rotating member, 301. Rotating motor, 302. Base plate, 303. Rotating plate, 304. Loading plate, 305. Column, 306. Stiffening plate. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 4 The embodiment of the present application discloses a rotating plate device with adjustable air permeability, including a rotating plate mechanism, which includes a plurality of rotating plate assemblies 2 respectively arranged at both ends of the main beam 1 in the transverse direction and in the middle of the main beam 1, each rotating plate assembly 2 includes a plurality of rotating parts 3 arranged along the main beam 1 in the longitudinal direction, each rotating part 3 includes a rotating motor 301, a base plate 302 driven to rotate by the rotating motor 301, and a rotating plate 303 fixedly connected to the base plate 302, and the rotating plate 303 extends in the vertical direction.

[0037] To improve the stability of the output rotation of the rotary motor 301, and thereby the rotation stability of the rotating plate 303, the output shaft of the rotary motor 301 is preferably connected to a support plate 304. This supports a larger load-bearing area. A height adjustment member is provided on the support plate 303, which cooperates with the base plate 302 to drive the rotation of the base plate 302. The height adjustment member allows the height of the rotating plate 303 to be adjusted by changing the height of the height adjustment member, without requiring changes to other structures, thereby reducing costs and improving efficiency. The height adjustment member can engage with the base plate 302 to drive the rotation of the base plate 302.

[0038] In this embodiment, the height adjustment member includes at least two columns 305 , and the heights of the columns 305 can be adjusted according to actual conditions.

[0039] In order to enhance the strength and wind resistance of the device in a strong wind environment, at least one stiffening plate 306 is further included. The stiffening plates 306 are fixedly connected to the rotating plate 303 and the base plate 302 respectively.

[0040] Specifically, the stiffening plate 306 is a right triangle, the vertical right-angled side of the stiffening plate 306 is fixedly connected to the rotating plate 303, and the horizontal right-angled side of the stiffening plate 306 is fixedly connected to the base plate 302, further improving the connection stability and strength between the rotating plate 303 and the base plate 302, and improving the wind resistance.

[0041] In this embodiment, the base plate 302 is disc-shaped, which improves the rotation stability of the rotating plate 303 .

[0042] Preferably, the angle between the rotating plate 303 and the main beam 1 in the transverse direction of the bridge is 0-90 degrees, with a wide rotation range to achieve different air permeability.

[0043] In this embodiment, when the rotating plates 303 rotate to be parallel to the main beam 1 along the bridge direction, two adjacent rotating plates 303 abut against each other, that is, the two rotating plates 303 are closed.

[0044] Preferably, the rotating plate 303 is a solar panel, and the rotating plate 303 is electrically connected to the rotating motor 301 , and the rotating motor 301 is powered by solar energy, thereby realizing self-power supply of the structure.

[0045] In order to improve the aesthetics and durability of the structure, the rotary motor 301 is preferably buried in the main beam 1 .

[0046] Figure 1 The installation position of the rotating plate device with adjustable air permeability is demonstrated, which can be adjusted according to actual conditions in actual application.

[0047] The operating principle of the adjustable air permeability rotating plate device is as follows: When the motor 301 is activated, it drives the support plate 304 to rotate via the output shaft. The support plate 304 drives the base plate 302 to rotate via two columns 305. The base plate 302 then drives the rotating plate 303 to rotate, thereby changing the angle of the rotating plate 303 to adjust the air permeability. The air permeability is defined as the ratio of the unobstructed area of the rotating plate device in the transverse direction of the bridge to the total area at the height of the rotating plate, expressed as λ = A 透风 / A 总 .

[0048] See also Figure 3 、 Figure 5 、 Figure 6 , define the length of the rotating plate 303 as a, the height as h, and ignore the thickness of the rotating plate 303. The distance between the centers of two adjacent rotating plates 303 is L, then L = a, and the angle between the rotating plate 303 and the transverse bridge direction is α. Then the air permeability λ can be approximately expressed as:

[0049]

[0050] Among them, A 透风 =A 总 -A不透风 , A 总 =L×h,A 不透风 =a×sinα×h. When the angle α between the rotating plate 303 and the transverse bridge is 90°, the device reaches the minimum air permeability state, such as Figure 7 As shown, at this time, the air permeability λ=0%, and the rotating plate device can be regarded as a stabilizing plate.

[0051] When the angle α between the rotating plate 303 and the transverse bridge direction is 0°, the device reaches the maximum air permeability state, such as Figure 8 As shown, the air permeability λ is 100% at this time.

[0052] In general, the rotating plate device is between the above two states. When the angle between the rotating plate 303 and the transverse bridge direction is 0°<α<90°, the rotating plate 303 actively adjusts the air permeability of the structure by actively adjusting the angle α. Figure 9 The figure shows the working state of α=30°, at which time the air permeability λ≈1-sin30°=0.5.

[0053] In addition, different angles can be set for the rotating plates 303 at different positions to form staggered air permeability, such as Figure 10 As shown in the figure, the spanwise correlation of the aerodynamic force of the bridge is weakened, and the vortex vibration of the bridge is controlled.

[0054] When the bridge structure does not have wind vibration problems, high air permeability will cause problems with driving comfort and safety. Therefore, the angle α should be increased to maintain a low air permeability state.

[0055] When vortex vibration begins to occur in the bridge structure at medium and low wind speeds, the angle α should be appropriately reduced while ensuring driving safety to increase the air permeability, improve the aerodynamic characteristics of the bridge structure, and suppress vortex vibration. Different angles can also be set for the rotating plates 303 at different positions. By setting different air permeabilities at different positions along the bridge, the spanwise coherence of the bridge structure can be reduced to further suppress vortex vibration.

[0056] When the ambient wind speed is high and the bridge is at risk of flutter, the angle α should be set to 90°, and the rotating plate structure will enter a zero-air-permeability working state, acting as a stabilizing plate to increase the critical flutter wind speed of the bridge structure and prevent bridge flutter.

[0057] The flutter control effect of the present invention has been verified by some wind tunnel tests. The test was conducted on a box girder suspension bridge segment model. By installing stabilizing plates of different heights, the effect of the stabilizing plates on the critical wind speed of the bridge structure flutter was explored. The height of the stabilizing plate was 0m, which corresponds to the case where no stabilizing plate was installed. The experimental results are shown in Figure 2. Figure 11As shown, experiments show that the flutter critical wind speed of the bridge structure with a stabilizing plate is significantly improved compared to that without a stabilizing plate. Setting the air permeability λ=0% in the present invention can achieve a similar effect to that of setting a stabilizing plate.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0059] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A rotating plate device with adjustable air permeability, characterized in that: It includes a rotating plate mechanism, which includes a plurality of rotating plate assemblies respectively provided at both ends of the main beam in the transverse bridge direction and the middle part of the main beam, each of the rotating plate assemblies includes a plurality of rotating parts provided along the main beam in the longitudinal bridge direction, each of the rotating parts includes a rotating motor, a base plate driven to rotate by the rotating motor, and a rotating plate fixedly connected to the base plate, the output shaft of the rotating motor is connected to a carrying plate, a height adjusting member is provided on the carrying plate, the height adjusting member cooperates with the base plate, the rotating plate extends in the vertical direction, and when the rotating plate rotates to be parallel to the main beam in the longitudinal bridge direction, two adjacent rotating plates abut against each other; When the bridge structure does not have wind vibration problems, the high air permeability will cause problems with driving comfort and safety, so the angle should be increased. , maintain low ventilation rate state; When the bridge structure begins to experience vortex vibration problems at low to medium wind speeds, the angle should be appropriately reduced while ensuring driving safety. , improve the air permeability, improve the aerodynamic characteristics of the bridge structure, and suppress vortex vibration. Different angles can also be set for the rotating plates at different positions. By setting different air permeabilities at different positions along the bridge, the spanwise coherence of the bridge structure can be reduced to further suppress vortex vibration. When the ambient wind speed is high and the bridge is at risk of flutter, the angle should be set , the rotating plate structure enters the zero air permeability working state, acts as a stabilizing plate, increases the flutter critical wind speed of the bridge structure, and prevents bridge flutter from occurring.

2. The rotating plate device with adjustable air permeability according to claim 1, characterized in that: The height adjustment member includes at least two columns.

3. The rotating plate device with adjustable air permeability according to claim 1, characterized in that: It also includes at least one stiffening plate, which is fixedly connected to the rotating plate and the base plate respectively.

4. The rotating plate device with adjustable air permeability according to claim 3, characterized in that: The stiffening plate is in the shape of a right triangle, the vertical right-angled side of the stiffening plate is fixedly connected to the rotating plate, and the horizontal right-angled side of the stiffening plate is fixedly connected to the base plate.

5. The rotating plate device with adjustable air permeability according to claim 1, characterized in that: The substrate is in a disc shape.

6. The rotating plate device with adjustable air permeability according to claim 1, characterized in that: The angle between the rotating plate and the transverse direction of the main beam is 0-90°.

7. The rotating plate device with adjustable air permeability according to claim 1, characterized in that: The rotating plate is a solar panel, and the rotating plate is electrically connected to the rotating motor.

8. The rotating plate device with adjustable air permeability according to claim 1, characterized in that: The rotary motor is embedded in the main beam.

Images