CN108842599B - One kind being based on bionic pneumatic drag reduction device and bridge - Google Patents
One kind being based on bionic pneumatic drag reduction device and bridge Download PDFInfo
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- CN108842599B CN108842599B CN201810781205.6A CN201810781205A CN108842599B CN 108842599 B CN108842599 B CN 108842599B CN 201810781205 A CN201810781205 A CN 201810781205A CN 108842599 B CN108842599 B CN 108842599B
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- blade
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- drag reduction
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses one kind to be based on bionic pneumatic drag reduction device, including network and the blade being attached in network, the network and blade are all flexible material, the blade is all movably installed in each grid of the network, the vane size and each sizing grid are adapted.Each blade can independent deformation, vibration, aerodynamic configuration can be adaptively changed under different wind actions, realize reduction windage in all cases, while allowing blade vibration, can drop resistance while consume energy, further decrease the wind-induced vibration of bridge structure.
Description
Technical field
The present invention relates to bridge technology fields, it particularly relates to a kind of pneumatic drag reduction device applied on bridge.
Background technique
Bridge as longspan structure is inevitably present wind-induced vibration problem, wherein the diversity of referred to as flutter
Self-excited vibration is more dangerous, when being vibrated at this time due to bridge structure can in moving air constant absorption energy, and the energy
Amount is greater than the energy that structural damping dissipates in vibration, and bridge vibration can unstability or pure more violent and that Torsion Coupling occurs
Torsional buckling causes structure to destroy.When wind speed is lower than the speed for being referred to as critical wind speed of flutter, bridge structure will not quiver
Vibration, to avoid damaging because of flutter.
Natural wind in atmospheric boundary layer locating for bridge structure all has ripple component, when this ingredient acts on bridge
When structure, bridge structure also occurs that randomness forced vibration, this vibration will not usually cause catastrophic structural failure thing
Therefore but excessive vibration still will affect construction period personnel's machine security and operation during Pedestrians and vehicles comfort, also
It is likely to decrease Predict Fatigue Life of Components.
When air-flow passes through Bridge Sections, it will appear the vortex alternately to fall off in wake flow, under certain condition, vortex has rule
It then periodically falls off and generates whirlpool and swash power.Since bridge structure is a vibration system, power can be swashed in periodic whirlpool
If vortex shedding frequencies are consistent natural vibration period with bridge structure Vortex-excited vibration occurs for the lower generation vortex-induced vibration of effect.Although whirlpool
Excited vibration is a kind of clipping vibration, but because it easily occurs at low wind speeds, to avoid the excessive influence traffic safety of amplitude, still
It is necessary to take measures to limit vortex-induced vibration and avoid Vortex-excited vibration as far as possible.
Currently, the method for improving bridge structure wind resisting stability mainly has three classes measure: structural measure, i.e. raising bridge knot
The torsion stiffness of structure reduces mass mement of inertia, to improve the critical wind of flutter to improve the torsion fundamental frequency of bridge structure
Speed；Mechanical measure, i.e., by the way that damper is arranged come dissipation energy, to inhibit the vibration of bridge structure in bridge structure specific position
It is dynamic；Aerodynamic Measures, i.e., improve the aerodynamic configuration of bridge structure by certain measures, stablizes to improve bridge structure wind resistance
Property.Structural measure improves limitation to bridge structure wind resisting stability is improved；The improvement of mechanical measure is preferable, but cost
It is high；Aerodynamic Measures are due to low cost, and effect is good and is widely used in bridge structure wind dynamic control, and concrete measure has: in bridge
Tuyere is arranged in beam section two sides；In beam bottom portion, deflector is set；It slots in bridge floor central stabilizer setting up and down, among box beam
Etc..
Current common Bridge Flutter control measure are aerodynamic Measures, such as tuyere, deflector, steadying plate etc., such as patent text
(publication number: CN101892625A, CN206553911U) is offered, as shown in Figure 1, it discloses a kind of wind fin plates, with certain
Angle is fixed in bridge main body structure, for improving the aeroperformance of bridge, improves flutter stability, but the disadvantage is that these
Wind deflector is all the specific position for being fixed on bridge, is passively control measure, restricted application can only be in specific wind field
It is lower to be applicable in, preferable air-flow guidance is only just shown when wind levels pass through bridge (or other specific inclination angles) to be made
With for various special wind existing for nature, these measures fixed are difficult to accomplish improve bridge in all cases
Flutter stability, universality is poor, and the relative position that this is mainly due to addition theretos on bridge is fixed, Bu Nenggen
It is adjusted according to incoming flow wind characteristic Real-time Feedback, bad adaptability.
Another aerodynamic Measures are a kind of cell structures shown in Fig. 2 in the prior art, in separative box-girder bridge beam
It entreats and grid and grill support frame is set at fluting, grid and grill support frame are all rigid structure, are controlled using this structure
The vortex-induced vibration of split type box beam.
But there is a problem of that effect is limited by the scheme that aerodynamic Measures improve Wind-resistance of Bridges stability in the prior art,
Segmentation scheme can aggravate vortex-induced vibration when avoiding flutter, because currently all aerodynamic Measures scheme uses the pneumatic outer of fixation
Shape, to be difficult to take into account the wind resistance demand of various aspects.Tuyere, central stabilizer this kind component can also largely increase
The weight of structure.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides it is a kind of apply on bridge based on bionic pneumatic drag reduction
The bridge of device and the application device solves the pneumatic structure for improving flutter stability in current existing highway bridge structure and exists
Universality it is poor, the problem of technical effect difference significantly improves the whole flutter stability of bridge structure, improves the longevity of bridge
Life, reduces risk.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: one kind is pneumatically subtracted based on bionic
Device is hindered, including network and the blade being attached in network, the network and blade are all flexible material, institute
It states and is all movably installed with the blade in each grid of network, the vane size and each sizing grid phase
It adapts to.
Further, the installation direction of at least one blade is different from other blades, so that by multiple leaves
Arbitrary deformation is waved by the blade to reduce windage and consumes energy to inhibit structure the array of piece composition under the action of the wind
Vibration.
Further, the network is different with the flexible material type of the blade.
Further, each grid of the network is that rectangular, rectangle, round or ellipse are one such or several
The combination of kind.
Further, the group that the shape of the blade is rectangular, rectangle, round or ellipse is one such or several
It closes.
The pneumatic drag reduction device is covered in the Bridge Sections and removed by a kind of bridge for being provided with the pneumatic drag reduction device
All parts except carriageway plate have the one side of the blade to need outwardly.
Further, the pneumatic drag reduction device is multiple single chip architectures, is needed according to bridge covering by multiple monolithic knots
Structure combines to form entirety.
(3) beneficial effect
The present invention provides a kind of bridges based on bionic pneumatic drag reduction device and the application device, and having following has
Beneficial effect: each blade can independent deformation, vibration, aerodynamic configuration can be adaptively changed under different wind actions, realize
Reduction windage in all cases, while allowing blade vibration, it can consume energy while dropping resistance, further decrease bridge knot
The wind-induced vibration of structure.Machine control unit is eliminated since deformation is completely adaptive with vibration, thus compared to active control scheme,
It is more succinct.Since the application uses flexible material, lightweight material production can be selected, reduce the impost of bridge structure.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of bridge pneumatic drag reduction device in the prior art；
Fig. 2 is the structural schematic diagram of another bridge pneumatic drag reduction device in the prior art；
Fig. 3 is the structural schematic diagram of pneumatic drag reduction device according to an embodiment of the present invention；
Fig. 4 is the cross-section diagram of the bridge according to an embodiment of the present invention for being provided with pneumatic drag reduction device；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
Fig. 3 is the structural schematic diagram of the pneumatic drag reduction device, and Fig. 4 is covered with the bridge of the pneumatic drag reduction device.It is a kind of
Based on bionic pneumatic drag reduction device, including network and the blade being attached in network, the network and
Blade is all flexible material, and the blade, the vane size are all movably installed in each grid of the network
It is adapted with each sizing grid.
Further, the installation direction of at least one blade is different from other blades, so that by multiple leaves
Arbitrary deformation is waved by the blade to reduce windage and consumes energy to inhibit structure the array of piece composition under the action of the wind
Vibration.
Further, the network is different with the flexible material type of the blade.
Further, each grid of the network is that rectangular, rectangle, round or ellipse are one such or several
The combination of kind.
Further, the group that the shape of the blade is rectangular, rectangle, round or ellipse is one such or several
It closes.
The pneumatic drag reduction device is covered in the Bridge Sections and removed by a kind of bridge for being provided with the pneumatic drag reduction device
All parts except carriageway plate have the one side of the blade to need outwardly.
Further, the pneumatic drag reduction device is multiple single chip architectures, is needed according to bridge covering by multiple monolithic knots
Structure combines to form entirety.
Blade profile changes: due to having used flexible material, when wind passes through, blade can be deformed under the action of the wind, outside
Shape changes the change for leading to suffered wind-force, and since this change is to comply with wind action, the wind-force being subject to after change can be with
Reduce, playing reduces the effect of windage by changing aerodynamic configuration.
Blade vibration energy consumption: flexible blade itself is in micro-vibration state, under the natural wind effect containing ripple component
Meeting sustained vibration, and air-flow bring energy is consumed during vibration, thus will be transmitted to the energy attenuating of bridge structure,
Reduce the response of structure.
Device rough air: it is tiny that the flexible cords of deformable blade, vibration and weave mesh have bridge surface
It rises and falls, the disturbed small vortex for being divided into scale different, not only improves blade dissipation air-flow when air-flow passes through, and is avoided that big
Amount and natural vibration period of bridge with frequency Vortex Shedding cause Vortex-excited vibration.
Working principle:
When wind passes through bridge, blade flexible changes shape with the wind, and therefore windage is reduced, while flexible blade is opened
Begin to vibrate, the energy in continuous dissipation wind, the energy for being finally transmitted to bridge structure will be less than the gross energy of wind input, evoke
Structural vibration also thus reduces, and since blade shape is different, Numerous, bridge structure airflow on surface multilated is on the one hand rapid
Mobility reduces, and buffets power and is weakened；On the other hand under a possibility that only having period different small vortex may be present, Vortex-excited vibration
Drop.The above various situation collective effects achieve the effect that bridge structure amplitude is obviously reduced, improve bridge structure safe, change
Benefaction people from garage comfort.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any
Those familiar with the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its invents
Design is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. one kind is based on bionic pneumatic drag reduction device, it is characterised in that: including network and be attached in network
Blade, the network and blade are all flexible material, are all movably installed with institute in each grid of the network
Blade is stated, the vane size and each sizing grid are adapted.
2. according to claim 1 a kind of based on bionic pneumatic drag reduction device, it is characterised in that: described at least one
The installation direction of blade is different from other blades, so that the array being made of multiple blades arbitrarily becomes under the action of the wind
Shape is waved by the blade to reduce windage and consumes energy to inhibit structural vibration.
3. according to claim 1 a kind of based on bionic pneumatic drag reduction device, it is characterised in that: the network
It is different with the flexible material type of the blade.
4. according to claim 1 a kind of based on bionic pneumatic drag reduction device, it is characterised in that: the network
Each grid be the one such or several combination of rectangle, round or ellipse.
5. according to claim 1 a kind of based on bionic pneumatic drag reduction device, it is characterised in that: the shape of the blade
The combination that shape is rectangle, round or ellipse is one such or several.
6. a kind of bridge for being provided with any pneumatic drag reduction device of claim 1-5, it is characterised in that: will be described pneumatic
Damping device is covered in all parts of the Bridge Sections in addition to carriageway plate, has the one side of the blade to need outwardly.
7. bridge according to claim 6, it is characterised in that: the pneumatic drag reduction device is multiple single chip architectures, according to
Bridge covering needs multiple single chip architectures combining to form entirety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810781205.6A CN108842599B (en) | 2018-07-16 | 2018-07-16 | One kind being based on bionic pneumatic drag reduction device and bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810781205.6A CN108842599B (en) | 2018-07-16 | 2018-07-16 | One kind being based on bionic pneumatic drag reduction device and bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108842599A CN108842599A (en) | 2018-11-20 |
| CN108842599B true CN108842599B (en) | 2019-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810781205.6A Active CN108842599B (en) | 2018-07-16 | 2018-07-16 | One kind being based on bionic pneumatic drag reduction device and bridge |
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| CN111441234B (en) * | 2020-03-27 | 2021-04-20 | 中南大学 | Deformable air nozzle for inhibiting wind-induced vibration of bridge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004036271A (en) * | 2002-07-04 | 2004-02-05 | Public Works Research Institute | Bridge |
| DE102004053898A1 (en) * | 2004-11-09 | 2006-05-11 | Tutech Innovation Gmbh | Device for damping oscillatory motion in a building |
| CN102031749A (en) * | 2009-09-28 | 2011-04-27 | 中交公路规划设计院有限公司 | Grid structure for controlling girder induced vibration of split steel box girder bridge |
| CN107090768A (en) * | 2017-06-15 | 2017-08-25 | 哈尔滨工业大学 | Bridge structure box girder Self inhaling is from blowing vibration absorber |
-
2018
- 2018-07-16 CN CN201810781205.6A patent/CN108842599B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004036271A (en) * | 2002-07-04 | 2004-02-05 | Public Works Research Institute | Bridge |
| DE102004053898A1 (en) * | 2004-11-09 | 2006-05-11 | Tutech Innovation Gmbh | Device for damping oscillatory motion in a building |
| CN102031749A (en) * | 2009-09-28 | 2011-04-27 | 中交公路规划设计院有限公司 | Grid structure for controlling girder induced vibration of split steel box girder bridge |
| CN107090768A (en) * | 2017-06-15 | 2017-08-25 | 哈尔滨工业大学 | Bridge structure box girder Self inhaling is from blowing vibration absorber |
Non-Patent Citations (1)
| Title |
|---|
| 箱梁颤振的数值模拟及气动能量分析;刘祖军等;《工程力学》;20150930;第32卷(第9期);全文 * |
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| CN108842599A (en) | 2018-11-20 |
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