WO2023155922A1 - 一种抑制桥梁涡振的柔性旋涡发生器 - Google Patents

一种抑制桥梁涡振的柔性旋涡发生器 Download PDF

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Publication number
WO2023155922A1
WO2023155922A1 PCT/CN2023/077431 CN2023077431W WO2023155922A1 WO 2023155922 A1 WO2023155922 A1 WO 2023155922A1 CN 2023077431 W CN2023077431 W CN 2023077431W WO 2023155922 A1 WO2023155922 A1 WO 2023155922A1
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flexible
vortex
bridge
vortex generator
fixed base
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PCT/CN2023/077431
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English (en)
French (fr)
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尹亚鹏
王汉封
赵崇宇
刘治威
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中南大学
高速铁路建造技术国家工程研究中心
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Publication of WO2023155922A1 publication Critical patent/WO2023155922A1/zh

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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

Definitions

  • the invention relates to the technical field of bridge accessory equipment, in particular to a flexible vortex generator for suppressing bridge vortex vibration.
  • Wind-induced vibration of bridges has always been a hot and difficult issue in the field of bridge engineering, such as vortex-induced vibration of Humen Bridge.
  • the control measures commonly used to suppress bridge vortex vibration include active control method (need external energy input) and passive control method (no external energy input).
  • Active control methods mainly include: controlling wake vortex shedding by generating secondary flow to suppress vortex-induced vibration, changing fluid dynamic viscosity and density by thermal effect to affect boundary layer separation, etc.
  • the passive control method mainly includes: changing the surface roughness to affect the velocity profile distribution of the boundary layer to control the separation point of the boundary layer, changing the local shape (adding a fairing, slotting the wall, arranging wind barriers, corner treatment, etc.) attached and so on.
  • the active control method requires external energy input, which often brings inconvenience to the project, and the problem of insufficient energy supply emerges endlessly.
  • the passive control method is only effective within a certain range of wind speed or angle of attack. Once it exceeds its optimal range, the wind resistance performance will be deteriorated.
  • the purpose of the present invention is to solve the problem in the prior art that bridges have poor wind resistance, resulting in relatively large vibrations in the bridge structure and bridge vortex vibrations, and provide a flexible vortex generator that suppresses bridge vortex vibrations.
  • a flexible vortex generator for suppressing bridge vortex vibration comprising a fixed base and a ferrule arranged on the fixed base, and the ferrule is provided with a flexible member , one end of the flexible member is detachably connected to the ferrule, and the other end is a free end.
  • the flexible member is made of flexible material.
  • the flexible member is a lightweight flexible film structure with a smooth surface.
  • the flexible member is a polyethylene film.
  • the flexible member is of a gradual thickness type.
  • a plurality of ventilation holes are provided on the surface of the flexible member.
  • the free end of the flexible member is provided with edge teeth, and the tooth structure of the edge teeth is battlement-shaped, triangular, convex circular or concave circular.
  • the ferrule includes two magnetic connectors, the two magnetic connectors are symmetrically arranged on the fixed base, and the two magnetic connectors are magnetically connected to the fixed base; the two magnetic connectors There is a magnetic connection between them, and one end of the flexible piece is clamped between the two magnetic connection pieces for fixing.
  • the fixing base is hoop-shaped, square-shaped or weight-shaped.
  • the self-adaptive deformation of the flexible film structure of the flexible part is used to induce a series of vortices through the flapping of the flexible structure, change the flow form of the bridge surface, enhance the wind resistance performance of the bridge, and suppress the vortex phenomenon of the bridge.
  • the flexible vortex generator is detachably installed on the bridge railing or the bridge surface. The installation angle between the flexible vortex generator and the horizontal plane is 0-90 degrees.
  • the flexible part on the flexible vortex generator is a smooth flexible film structure.
  • the flexible film When the fluid When flowing through this flexible film, according to the different fluid speeds, the flexible film will produce five kinds of motions, including stable deformation, slight swing at the tip, large swing at the middle and upper part, violent flapping as a whole, flapping and hitting the wall (or inward rolling), etc. form.
  • the flexible film enters the stable deformation stage its free end only produces a shear layer without vortex shedding, which is equivalent to moving the fluid separation point to the outside of the structure, which affects the flow interference. interference is relatively weak.
  • the flexible film When the flexible film enters the swinging or flapping stage, it will strengthen the momentum exchange between the airflow outside the bridge structure and the airflow on the surface of the structure, inhibit the separation of the airflow on the surface of the bridge structure, change the original vortex shedding form, and enhance the wind resistance stability of the bridge structure , to suppress the bridge vortex vibration phenomenon.
  • the momentum exchange works best.
  • the influence area of the film is limited.
  • the momentum exchange effect is better in the area close to the film, and the momentum exchange effect in the area far away from the film decays rapidly. Therefore, it is best to place flexible films at an appropriate distance along the flow direction, that is, multiple rows can be arranged side by side.
  • the flexible vortex generator in the present invention enables the momentum exchange effect to be continuously strengthened in the flow direction, and makes up for the problem of insufficient influence area of single-row membranes.
  • the flexible vortex generator in the present invention does not require any external energy input, does not need to change the existing bridge device, and only uses the adaptive deformation of the flexible parts to induce a series of vortices through the flapping of the flexible structure to change the flow form of the bridge surface. Enhance the wind resistance performance of the bridge, and significantly suppress the vortex vibration phenomenon of the bridge;
  • the flexible part in the present invention adopts thickness changes or adopts different edge tooth structures at the free end, which can produce adaptive deformation according to different wind environments, so as to generate more accurate flapping patterns and suppress the vortex vibration phenomenon of bridges, which is suitable for very broad in scope;
  • the flexible vortex generator in the present invention has a simple structure, is convenient to replace, is easy to disassemble, is very convenient for daily maintenance, avoids various complicated maintenance work, and saves manpower and material resources.
  • FIG. 1 is a schematic structural view of a flexible vortex generator in Embodiment 1 of the present invention
  • Fig. 2 is a schematic structural view of a square fixed base in Embodiment 2 of the present invention.
  • Embodiment 3 is a schematic structural view of a weight-shaped fixed base in Embodiment 3 of the present invention.
  • Fig. 4 is a schematic structural diagram of triangular edge teeth in Embodiment 4 of the present invention.
  • 1-fixed base 2-magnetic connector, 3-flexible part, 4-ventilation hole, 5-edge teeth.
  • a flexible vortex generator to suppress bridge vortex vibration is installed on the bridge railing, including a fixed base 1 and a ferrule arranged on the fixed base 1.
  • the fixed base 1 is Clamp-shaped, clamped with the circular railing of the bridge, easy to disassemble.
  • the ferrule includes two magnetic connectors 2, the two magnetic connectors 2 are symmetrically arranged on the fixed base 1, and the two magnetic connectors 2 are magnetically connected to the fixed base 1; the two magnetic connectors 2 are also magnetically connected One end of the flexible piece 3 is clamped between two magnetic connectors 2 for fixing, and the other end of the flexible piece 3 is a free end, which can freely swing with the wind.
  • the invention has the advantages of simple structure, convenient replacement, easy disassembly, very convenient daily maintenance, exempting various maintenance work with complex operations, and saving manpower and material resources.
  • the flexible part 3 is a lightweight flexible film structure with a smooth surface and no wrinkles.
  • the flexible part 3 is a rectangular polyethylene film with a gradual thickness and an aspect ratio of 1.5.
  • a plurality of ventilators are scattered on the surface of the flexible part 3. hole 4, and edge teeth 5 are arranged at the free end of the flexible member 3 at the same time, and the tooth structure of the edge teeth 5 in this embodiment is a battlement shape.
  • the flexible part 3 of this material and structure can produce self-adaptive deformation in the wind environment, induce a series of vortices through the flapping of the flexible structure, change the flow pattern of the bridge surface, enhance the wind resistance performance of the bridge, and suppress the vortex phenomenon of the bridge.
  • an acceleration sensor is also provided in the fixed base 1 to detect the vibration of the bridge deck and to feed back the vibration suppression effect in real time.
  • the fixed base 1 of this embodiment is square, and is clamped with the square railing of the bridge, and the flexible vortex generator can be installed parallel to the horizontal plane.
  • the fixed base 1 of this embodiment is weight-shaped and can be placed directly on the construction bridge deck, and the flexible vortex generator is placed perpendicular to the horizontal plane.
  • the teeth 5 at the edge of the free end of the flexible member 3 in this embodiment have a triangular tooth structure.

Abstract

一种抑制桥梁涡振的柔性旋涡发生器，包括固定基座（1）和设置在固定基座（1）上的卡套，卡套上设置有柔性件（3），柔性件（3）一端与卡套可拆卸连接，另一端为自由端，可随风自由摆动。柔性旋涡发生器不需要任何外部能量输入，不需要改变现有桥梁装置，仅利用柔性件的自适应变形，通过柔性结构拍动诱发一系列旋涡，改变桥梁表面流动形态，增强桥梁抗风性能，显著抑制桥梁涡振现象。

Description

一种抑制桥梁涡振的柔性旋涡发生器 技术领域
本发明涉及桥梁附属设备技术领域，具体涉及一种抑制桥梁涡振的柔性旋涡发生器。
背景技术
桥梁风致振动现象一直是桥梁工程领域的热点和难点问题，如虎门大桥涡激振动。目前常用于抑制桥梁涡振的控制措施包括主动控制法(需要外部能量输入)和被动控制法(不需要外部能量输入)。主动控制法主要包括：通过产生二次流控制尾流涡脱以抑制涡激振动，通过热效应改变流体动力粘度和密度来影响边界层分离等。被动控制法主要包括：改变表面粗糙度以影响边界层速度剖面分布从而控制边界层分离点，改变局部外形(添加整流罩、壁面开槽、布置风屏障、边角处理等)以影响流动分离再附等。
但是，以上这些控制方法，存在很多问题以及弊端。主动控制法，需要外部能量输入，常给工程带来不便，能量供应不足问题层出不穷。被动控制法，仅在某一风速或攻角范围内有效，一旦超出其最佳使用范围，会恶化抗风性能。
因此，研究一种新型的抑制涡振的附属设备成为亟待解决的问题。
发明内容
本发明的目的在于解决现有技术中存在的桥梁抗风性能较差，导致桥梁结构出现较大幅度的振动，产生桥梁涡振现象的问题，提供一种抑制桥梁涡振的柔性旋涡发生器。
为解决上述技术问题，本发明采用的技术方案如下：一种抑制桥梁涡振的柔性旋涡发生器，包括固定基座和设置在固定基座上的卡套，所述卡套上设置有柔性件，所述柔性件一端与卡套可拆卸连接，另一端为自由端。
优选地，所述柔性件由柔性材质构成。
优选地，所述柔性件为表面平滑的轻质柔性薄膜结构。
优选地，所述柔性件为聚乙烯薄膜。
优选地，所述柔性件为厚度渐变型。
优选地，所述柔性件表面设置有多个透风孔。
优选地，所述柔性件的自由端设置有边缘齿，所述边缘齿的齿状结构为城垛形、三角形、外凸圆形或内凹圆形。
进一步优选，所述卡套包括两个磁性连接件，所述两个磁性连接件对称设置在固定基座上，所述两个磁性连接件与固定基座磁性连接；所述两个磁性连接件之间磁性连接，所述柔性件一端夹持在两个磁性连接件之间进行固定。
进一步优选，所述固定基座为卡箍形、方形或砝码形。
当流体流过桥梁结构时，会在结构表面尖锐处发生流动分离，形成剪切层，剪切层脱落后会形成周期性的旋涡脱落。当旋涡脱落频率和桥梁结构某阶模态频率接近时，会导致桥梁结构出现较大幅度的振动，即产生桥梁涡振现象。因此，抑制桥梁结构表面的旋涡脱落，成为控制桥梁涡振的关键因素。
本发明中利用柔性件的柔性薄膜结构的自适应变形，通过柔性结构拍动诱发一系列旋涡，改变桥梁表面流动形态，增强桥梁抗风性能，抑制桥梁涡振现象。柔性旋涡发生器可拆卸的安装在桥梁栏杆或者桥梁面上，柔性旋涡发生器与水平面的安装夹角为0～90度，柔性旋涡发生器上的柔性件为表面平滑的柔性薄膜结构，当流体流过这种柔性薄膜时，根据流体速度的不同，柔性薄膜会产生稳定变形、尖部轻微摆动、中上部大幅摆动、整体剧烈拍动、拍动并撞壁(或内卷)等5种运动形态。当柔性薄膜进入稳定变形阶段时，其自由端只产生剪切层而没有旋涡脱落，相当于把流体分离点往结构外部移动，对流动的干 扰作用比较弱。而当柔性薄膜进入摆动或拍动阶段时，会加强桥梁结构外部气流同结构表面气流的动量交换，抑制桥梁结构表面气流的分离，改变原有的旋涡脱落形态，增强桥梁结构的抗风稳定性，抑制桥梁涡振现象。
尤其是当薄膜拍动频率与旋涡脱落频率同步时，动量交换效果最好。但是薄膜的影响区域是有限的，靠近薄膜的区域动量交换效果较好，远离薄膜的区域动量交换效果快速衰减，因此最好沿流动方向间隔适当的距离依次放置柔性薄膜，即可以并排布置多列本发明中的柔性旋涡发生器，使得动量交换效果在流向上能够持续加强，弥补单列薄膜的影响区域不足的问题。
本发明所具有的有益效果：
一)本发明中的柔性旋涡发生器不需要任何外部能量输入，不需要改变现有桥梁装置，仅利用柔性件的自适应变形，通过柔性结构拍动诱发一系列旋涡，改变桥梁表面流动形态，增强桥梁抗风性能，显著抑制桥梁涡振现象；
二)本发明中的柔性件采用厚度变化或者在自由端采用不同的边缘齿结构，能够根据不同的风环境产生自适应变形，从而更加精确的发生拍动形态，抑制桥梁涡振现象，其适用范围非常广泛；
三)本发明中的柔性旋涡发生器结构简单，更换便捷，易于拆卸，非常方便日常维护，免除各种操作复杂的维修工作，节省人力物力。
附图说明
图1为本发明实施例1中柔性旋涡发生器的结构示意图；
图2为本发明实施例2中方形固定基座的结构示意图；
图3为本发明实施例3中砝码形固定基座的结构示意图；
图4为本发明实施例4中三角形边缘齿的结构示意图。
图中：1-固定基座，2-磁性连接件，3-柔性件，4-透风孔，5-边缘齿。
具体实施方式
下面结合附图和具体实施例对本发明作进一步的说明。
实施例1
如图1所示，一种抑制桥梁涡振的柔性旋涡发生器，安装在桥梁栏杆上，包括固定基座1和设置在固定基座1上的卡套，本实施例中固定基座1为卡箍形，与桥梁的圆形栏杆卡接，方便拆卸。卡套包括两个磁性连接件2，两个磁性连接件2对称设置在固定基座1上，两个磁性连接件2与固定基座1磁性连接；两个磁性连接件2之间同样磁性连接，将柔性件3一端夹持在两个磁性连接件2之间进行固定，柔性件3的另一端为自由端，可随风自由摆动。本发明结构简单，更换便捷，易于拆卸，非常方便日常维护，免除各种操作复杂的维修工作，节省人力物力。
柔性件3为表面平滑无褶皱的轻质柔性薄膜结构，本实施例中柔性件3为矩形的聚乙烯薄膜，厚度渐变型，长宽比为1.5，在柔性件3表面分散设置有多个透风孔4，同时在柔性件3的自由端设置有边缘齿5，本实施例中边缘齿5的齿状结构为城垛形。这种材质和结构的柔性件3在风环境中能产生自适应变形，通过柔性结构拍动诱发一系列旋涡，改变桥梁表面流动形态，增强桥梁抗风性能，抑制桥梁涡振现象。
具体使用时，将柔性旋涡发生器的固定基座1卡接到桥梁的圆形栏杆上，将柔性件3的一端夹持在卡套的两个磁性连接件2之间，调整柔性旋涡发生器与水平面之间的夹角为45度。当气流经过柔性旋涡发生器的柔性件3时，柔性件3进入摆动或拍动阶段，加强桥梁结构外部气流同结构表面气流的动量交换，抑制桥梁结构表面气流的分离，改变原有的旋涡脱落形态，增强桥梁结构的抗 风稳定性，从而显著抑制桥梁涡振现象。本实施例中还在固定基座1内设置有加速度传感器，用于检测桥面振动情况，实时反馈抑振效果。
实施例2
在实施例1的基础上，如图2所示，本实施例的固定基座1为方形，与桥梁的方形栏杆卡接，柔性旋涡发生器可与水平面平行安装。
实施例3
在实施例1的基础上，如图3所示，本实施例的固定基座1为砝码形，可直接放置在施工桥面上，柔性旋涡发生器与水平面垂直放置。
实施例4
在实施例1的基础上，如图4所示，本实施例中柔性件3自由端边缘齿5的齿状结构为三角形。
本发明的说明书和附图被认为是说明性的而非限制性的，在本发明基础上，本领域技术人员根据所公开的技术内容，不需要创造性的劳动就可以对其中一些技术特征做出一些替换和变形，均在本发明的保护范围内。

Claims (7)

  1. 一种抑制桥梁涡振的柔性旋涡发生器，其特征在于，包括固定基座和设置在固定基座上的卡套，所述卡套上设置有柔性件，所述柔性件一端与卡套可拆卸连接，另一端为自由端；所述柔性件由柔性材质构成；所述柔性件为表面平滑的轻质柔性薄膜结构。
  2. 根据权利要求1所述的柔性旋涡发生器，其特征在于，所述柔性件为聚乙烯薄膜。
  3. 根据权利要求1所述的柔性旋涡发生器，其特征在于，所述柔性件为厚度渐变型。
  4. 根据权利要求1所述的柔性旋涡发生器，其特征在于，所述柔性件表面设置有多个透风孔。
  5. 根据权利要求1所述的柔性旋涡发生器，其特征在于，所述柔性件的自由端设置有边缘齿，所述边缘齿的齿状结构为城垛形、三角形、外凸圆形或内凹圆形。
  6. 根据权利要求1所述的柔性旋涡发生器，其特征在于，所述卡套包括两个磁性连接件，所述两个磁性连接件对称设置在固定基座上，所述两个磁性连接件与固定基座磁性连接；所述两个磁性连接件之间磁性连接，所述柔性件的一端夹持在两个磁性连接件之间进行固定。
  7. 根据权利要求1所述的柔性旋涡发生器，其特征在于，所述固定基座为卡箍形、方形或砝码形。
PCT/CN2023/077431 2022-02-21 2023-02-21 一种抑制桥梁涡振的柔性旋涡发生器 WO2023155922A1 (zh)

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CN114369995B (zh) * 2022-02-21 2022-11-04 中南大学 一种抑制桥梁涡振的柔性旋涡发生器
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