A two-way tuned mass damping vibration reduction device

Abstract

The present invention discloses a two-way tuned mass damping vibration reduction device, which comprises a mounting frame, a vibration reduction system and a guiding device. The mounting frame includes an upper connecting plate and a lower connecting plate; the vibration reduction system includes a plurality of suspension elements, a plurality of helical compression springs, a plurality of vertical dampers, a mass block, and a plurality of horizontal damping devices. Among them, the suspension elements, the horizontal damping devices and the mass block constitute a horizontal vibration reduction system, and the helical compression springs, the vertical dampers and the mass block constitute a vertical vibration reduction system; the guiding device includes a plurality of linear bearings, a plurality of linear bearing guide rods and a pair of horizontal sliding bearings. The present invention can simultaneously achieve the vibration reduction functions in the vertical and horizontal directions, can meet the safety and comfort of the structure or equipment during use, and has the characteristics of good control effect, simple structure, easy installation and maintenance, safety and reliability, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic isolation and vibration reduction in civil engineering, and more specifically, to a bi-directional tuned mass damper for vibration reduction. Background Art

[0002] To meet the increasingly growing requirements for architectural aesthetic design and functional use, the design trend of modern civil engineering structures is gradually developing towards large-span, lightweight, and high-rise directions. This lightweight structural form reduces the structural stiffness, causing the structure to generate significant structural vibrations under low-frequency excitations such as wind loads or pedestrian loads. In daily life, a common type of structure is a pedestrian overpass; due to the relatively flexible nature of this type of structural system, its natural vibration frequency is generally close to the walking frequency of the crowd, approximately 0.5 Hz to 2.8 Hz. Therefore, it is necessary to control the vertical and cross-sectional horizontal vibrations of the overpass structure. To achieve vibration control of lightweight structures, traditional technical means are to install tuned mass dampers on the structure.

[0003] Currently, common tuned mass dampers include supported dampers and pendulum dampers. Supported dampers suppress the vibrations of the controlled structure by supporting a mass block with a vertical spring; pendulum dampers suppress the vibrations of the controlled structure by suspending a mass block on a suspension rod. Due to the structural limitations of these two types of dampers, in actual engineering, when it is necessary to simultaneously control the horizontal and vertical vibrations of the structure, supported dampers and pendulum dampers need to be arranged at corresponding positions. This vibration control method increases the manufacturing cost of the dampers and also poses requirements for the installation space of the dampers. Therefore, it is necessary to make improvements. Summary of the Invention

[0004] To make up for this defect, the present invention aims to propose a bi-directional tuned mass damper for vibration reduction to achieve coordinated control of the vertical and horizontal vibrations of civil engineering structures.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A bi-directional tuned mass damper for vibration reduction, comprising a mounting frame, a vibration reduction system, and a guiding device, wherein:

[0007] The mounting frame includes an upper connecting plate and a lower connecting plate. The upper connecting plate is used for the conversion between the horizontal vibration reduction system and the vertical vibration reduction system. The lower connecting plate is used for connecting and fixing to the controlled structure, and a square is cut out from the center of the lower connecting plate to form a hollow area;

[0008] The vibration damping system includes a plurality of suspension elements, a plurality of helical compression springs, a plurality of vertical dampers, a mass block, and a plurality of horizontal damping devices. Among them, the suspension elements, the horizontal damping devices, and the mass block constitute a horizontal vibration damping system, and the helical compression springs, the vertical dampers, and the mass block constitute a vertical vibration damping system;

[0009] The mass block is installed in the hollow area of the lower connecting plate; the upper and lower ends of the suspension element are respectively connected and fixed to the upper connecting plate and the mass block; the horizontal damping devices are installed on the opposite left and right sides of the mass block, also located in the hollow area of the lower connecting plate; the two ends of each horizontal damping device are respectively connected and fixed to the mass block and a pair of side edges of the square hollow area of the lower connecting plate;

[0010] The upper and lower ends of the helical compression spring are respectively connected and fixed to the upper connecting plate and the lower connecting plate, and the upper and lower ends of the vertical damper are also respectively connected and fixed to the upper connecting plate and the lower connecting plate;

[0011] The guiding device includes a plurality of linear bearings, a plurality of linear bearing guide rods, and a pair of horizontal sliding bearings. The linear bearings are installed on the upper connecting plate; the linear bearing guide rods are inserted into the interior of the helical compression spring, with their lower ends fixed to the lower connecting plate and their upper ends inserted into the corresponding linear bearings; the horizontal sliding bearings are installed on a pair of parallel side edges of the square hollow area of the lower connecting plate and are connected to a pair of parallel side edges of the mass block.

[0012] According to a preferred embodiment of the present invention, the cross-sectional shapes of the upper connecting plate and the lower connecting plate are circular or regular polygons.

[0013] According to the present invention, a plurality of connecting pieces are provided on the upper surface of the lower connecting plate to be connected and fixed to the controlled structure by means of the connecting pieces.

[0014] According to a preferred embodiment of the present invention, the number of the connecting pieces is four, which are evenly distributed near the outer edge of the lower connecting plate.

[0015] According to another preferred embodiment, pin shafts are inserted through the positions of the upper connecting plate and the mass block corresponding to the suspension elements, and the upper and lower ends of each suspension element are respectively connected and fixed to the upper connecting plate and the mass block through the pin shafts.

[0016] According to another preferred embodiment, the number of the suspension elements is four, which are symmetrically distributed in pairs on the mass block.

[0017] According to another preferred embodiment, the number of the horizontal damping devices is four, which are symmetrically distributed on both sides of the mass block.

[0018] According to another preferred embodiment, the number of the helical compression springs is four, symmetrically distributed on the outer side of the hollowed-out area of the lower connecting plate.

[0019] According to another preferred embodiment, the number of the vertical dampers is also four, symmetrically distributed on the outer sides of the four sides of the square hollowed-out area of the lower connecting plate.

[0020] The two-way tuned mass damper and vibration reduction device of the present invention has the following beneficial effects:

[0021] 1. The present invention uses helical compression spring elements to achieve vertical vibration reduction and a suspension system to achieve horizontal vibration reduction; the overall system belongs to a passive control device, and through sharing a tuned mass block, it can achieve coordinated control of horizontal and vertical structural vibrations.

[0022] 2. Using spring elements and suspension elements to achieve dynamic vibration absorption, it has the characteristics of simple structure and convenient processing; the suspension element is connected to the upper connecting plate through a connecting pin shaft, and has the characteristics of easy replacement, easy installation, and easy disassembly; according to the frequency requirements of vertical vibration reduction and horizontal vibration reduction in actual projects, each element of the vibration reduction device can be uniformly designed and mass-produced, reducing the installation and maintenance difficulty of the device.

[0023] 3. In the two-way tuned mass damper and vibration reduction device of the present invention, the horizontal vibration reduction system and the vertical vibration reduction system share a mass block, reducing the manufacturing cost of the control device; it is also convenient to replace the spring and suspension elements according to the actual dynamic characteristics of the engineering structure, improving the applicability, reliability, and durability of the device.

[0024] 4. The present invention can simultaneously achieve the control of vertical and horizontal vibrations of civil engineering structures. Vertical vibration reduction is achieved by adjusting the total vertical stiffness determined by the spring; among them, the number of springs and their stiffness are determined by the dynamic characteristics of the structure and the preset target control performance. Horizontal vibration reduction is achieved by changing the length of the suspension rod or cable, and the horizontal vibration reduction period can be adjusted more conveniently. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the two-way tuned mass damper and vibration reduction device of the present invention.

[0026] Figure 2 is Figure 1 a sectional view along A-A.

[0027] Reference Signs:

[0028] 1. Linear bearing; 2. Linear bearing guide rod; 3. Upper connecting plate; 4. Lower connecting plate;

[0029] 5. Connecting pin shaft; 6. Suspension element; 7. Helical compression spring; 8. Vertical damping device;

[0030] 9. Mass block; 10. Horizontal sliding bearing; 11. Connecting piece; 12. Horizontal damping device;

[0031] 41. A pair of side edges of the hollowed-out area; 42. Another pair of parallel side edges of the hollowed-out area. Detailed implementation manners

[0032] The following will specifically describe the preferred embodiments of the two-way tuned mass damping and vibration reduction device of the present invention in conjunction with the accompanying drawings. Among them, the accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principle of the present invention, rather than to limit the scope of the present invention. In addition, the embodiments of the present invention are used in the vibration control of structures, and the vibration control here includes but is not limited to ground pulsation, wind load, pedestrian load, etc., and can also be seismic action; therefore, the present invention can also be used for the seismic response control of structures.

[0033] The two-way tuned mass damping and vibration reduction device of the present invention is applied to the field of civil engineering and is mainly used to achieve the vibration control of civil engineering structures. Generally speaking, the structure to be vibration-reduced can be a pedestrian bridge, a pedestrian corridor, or other building structures that need to achieve coordinated control of horizontal vibration and vertical vibration. At the same time, the present invention can be used for both the structural response control under wind vibration excitation and the structural response control under pedestrian excitation. By using the present invention, the structural response can be reduced, two-way vibration control can be achieved, the safety of the structure can be increased, and the comfort of use and the durability of service operation can be guaranteed.

[0034] The two-way tuned mass damping and vibration reduction device of the present invention includes a mounting frame, a vibration reduction system, and a guiding device, as Figure 1 shown, where:

[0035] The mounting frame includes an upper connecting plate 3 and a lower connecting plate 4. The upper connecting plate 3 is used for the conversion between the horizontal vibration reduction system and the vertical vibration reduction system, and the lower connecting plate 4 is used for connecting and fixing with the controlled structure (target vibration reduction object, not shown in the figure). In this embodiment, the cross-sectional shapes of the upper connecting plate 3 and the lower connecting plate 4 are circular or regular polygons, and a square is cut out from the center of the lower connecting plate 4 to form a hollowed-out area. Further, a plurality of connecting pieces 11 are provided on the upper surface of the lower connecting plate 4 to connect and fix with the controlled structure by means of the connecting pieces 11. Combining Figure 2 shown, the number of the connecting pieces 11 is four, and they are evenly distributed near the outer edge of the lower connecting plate 4.

[0036] The vibration damping system includes a plurality of suspension elements 6, a plurality of helical compression springs 7, a plurality of vertical dampers 8, a mass block 9, and a plurality of horizontal damping devices 12. Among them, the suspension elements 6, the horizontal damping devices 12, and the mass block 9 constitute a horizontal vibration damping system, and the helical compression springs 7, the vertical dampers 8, and the mass block 9 constitute a vertical vibration damping system.

[0037] Further, the mass block 9 is installed in the hollow area of the lower connecting plate 4; the upper and lower ends of the suspension element 6 are respectively connected and fixed to the upper connecting plate 3 and the mass block 9. Specifically, pin shafts 5 are inserted through the positions corresponding to the suspension element 6 in the upper connecting plate 3 and the mass block 9, and the upper and lower ends of each suspension element 6 are respectively connected and fixed to the upper connecting plate 3 and the mass block 9 through the pin shafts 5; the horizontal damping devices 12 are installed on the opposite left and right sides of the mass block 9, and are also located in the hollow area of the lower connecting plate 4; the two ends of each horizontal damping device 12 are respectively connected and fixed to the mass block 9 and a pair of side edges 41 of the square hollow area of the lower connecting plate 4. In this embodiment, as shown in Figure 2 The number of the suspension elements 6 is four, which are symmetrically distributed in pairs on the mass block 9; the number of the horizontal damping devices 12 is also four, which are symmetrically distributed on both sides of the mass block 9.

[0038] The upper and lower ends of the helical compression spring 7 are respectively connected and fixed to the upper connecting plate 3 and the lower connecting plate 4, and the upper and lower ends of the vertical damper 8 are also respectively connected and fixed to the upper connecting plate 3 and the lower connecting plate 4. The fixing method can be welding or a conventional mechanical fixing method. In this embodiment, the number of the helical compression springs 7 is four, which are symmetrically distributed outside the hollow area of the lower connecting plate 4; the number of the vertical dampers 8 is also four, which are symmetrically distributed on the outer sides of the four sides of the square hollow area of the lower connecting plate 4.

[0039] The guiding device includes a plurality of linear bearings 1, a plurality of linear bearing guide rods 2, and a pair of horizontal sliding bearings 10. Among them, the linear bearings 1 are installed on the upper connecting plate 3; the linear bearing guide rods 2 are inserted through the inside of the helical compression spring 7, the lower ends thereof are fixed to the lower connecting plate 4, and the upper ends thereof are inserted through the corresponding linear bearings 1; in this embodiment, the function of the linear bearing guide rods 2 is to limit the horizontal displacement of the upper connecting plate 3; at the same time, the linear bearing guide rods 2 can prevent the helical compression spring 7 from becoming unstable. As shown in Figure 2As shown, the number of linear bearings 1 and linear bearing guide rods 2 is the same as that of the helical compression springs 7, all being four, and the central axes of the three are coaxial. The horizontal sliding bearing 10 is installed on a pair of parallel sides 42 of the square hollow area of the lower connecting plate 4 and is connected to a pair of parallel sides of the mass block 9, so that the mass block 9 can horizontally slide in the hollow area of the lower connecting plate 4 by means of the horizontal sliding bearing 10. The function of the horizontal sliding bearing 10 is to limit the horizontal movement direction of the mass block 9 and ensure that the tuned mass damping device plays a control role in the designed structural horizontal vibration direction.

Claims

1. A two-way tuned mass damping vibration reduction device, characterized in that It includes a mounting bracket, a vibration damping system and a guiding device, wherein: The mounting bracket includes an upper connecting plate (3) and a lower connecting plate (4). The upper connecting plate (3) is used for the conversion between the horizontal vibration damping system and the vertical vibration damping system. The lower connecting plate (4) is used for connecting and fixing with the controlled structure, and a square is cut out from the center of the lower connecting plate (4) to form a hollow area; The vibration damping system includes a plurality of suspension elements (6), a plurality of helical compression springs (7), a plurality of vertical dampers (8), a mass block (9), and a plurality of horizontal damping devices (12). Among them, the suspension elements (6), the horizontal damping devices (12) and the mass block (9) constitute the horizontal vibration damping system, and the helical compression springs (7), the vertical dampers (8) and the mass block (9) constitute the vertical vibration damping system; The mass block (9) is installed in the hollow area of the lower connecting plate (4); the upper and lower ends of the suspension element (6) are respectively connected and fixed to the upper connecting plate (3) and the mass block (9); the horizontal damping device (12) is installed on the opposite left and right sides of the mass block (9), and is also located in the hollow area of the lower connecting plate (4); the two ends of each horizontal damping device (12) are respectively connected and fixed to the mass block (9) and a pair of side edges (41) of the square hollow area of the lower connecting plate (4); The upper and lower ends of the helical compression spring (7) are respectively connected and fixed to the upper connecting plate (3) and the lower connecting plate (4), and the upper and lower ends of the vertical damper (8) are also respectively connected and fixed to the upper connecting plate (3) and the lower connecting plate (4); The guiding device includes a plurality of linear bearings (1), a plurality of linear bearing guide rods (2) and a pair of horizontal sliding bearings (10). The linear bearings (1) are installed on the upper connecting plate (3); the linear bearing guide rods (2) pass through the inside of the helical compression spring (7), the lower end is fixed to the lower connecting plate (4), and the upper end passes through the corresponding linear bearing (1); the horizontal sliding bearings (10) are installed on a pair of parallel side edges (42) of the hollow area of the lower connecting plate (4) and are connected to a pair of parallel side edges of the mass block (9); The cross-sectional shapes of the upper connecting plate (3) and the lower connecting plate (4) are circular or regular polygons; Pin shafts (5) are provided at the positions corresponding to the suspension elements (6) on the upper connecting plate (3) and the mass block (9). The upper and lower ends of each suspension element (6) are respectively connected and fixed to the upper connecting plate (3) and the mass block (9) through the pin shafts (5).

2. The two-way tuned mass damping vibration reduction device according to claim 1, characterized in that, A plurality of connecting pieces (11) are provided on the upper surface of the lower connecting plate (4) to connect and fix with the controlled structure by means of the connecting pieces (11).

3. The two-way tuned mass damping vibration reduction device according to claim 2, characterized in that, The number of the connecting pieces (11) is four, and they are evenly distributed near the outer edge of the lower connecting plate (4).

4. The two-way tuned mass damping vibration reduction device according to claim 1, characterized in that, The number of the suspension elements (6) is four, and they are symmetrically distributed in pairs on the mass block (9).

5. The two-way tuned mass damping vibration reduction device according to claim 1, characterized in that, The number of the horizontal damping devices (12) is four, and they are symmetrically distributed on both sides of the mass block (9).

6. The two-way tuned mass damping vibration reduction device according to claim 1, characterized in that, The number of the helical compression springs (7) is four, which are symmetrically distributed on the outer sides of the hollowed-out area of the lower connecting plate (4).

7. The two-way tuned mass damping vibration reduction device according to claim 1, characterized in that, The number of the vertical dampers (8) is also four, which are symmetrically distributed on the outer sides of the four sides of the square hollowed-out area of the lower connecting plate (4).

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