CN112112002A - Special two-way harmonious mass damper of air rail track roof beam - Google Patents

Abstract

The invention relates to a special bidirectional tuning mass damper for an empty rail track beam, comprising an embracing shell, a lateral guide rail, a box body, a lateral shock absorber, a vertical guide rail, a tuning mass block and a vertical shock absorber. The embracing shell is provided with Above the empty rail track beam, the lateral guide rails are arranged at the upper and lower ends of the inside of the holding shell, the box body is slidably connected to the lateral guide rails, one end of the lateral shock absorber is connected to the side wall of the box body, and the other end is connected to the side wall of the holding shell The vertical guide rail is arranged on the inner wall of the box, the tuning mass block is slidably connected to the vertical guide rail, one end of the vertical vibration damper is connected with the tuning mass block, and the other end is connected with the top of the box. Compared with the prior art, the present invention nests the vertical vibration damping system inside the hollow box body, and uses the box body as the mass block in the lateral vibration damping system, which has the advantages of reducing the overall mass and saving space, and can be changed by changing Tuning the type and quantity of mass, spring and damper can easily achieve the excellent effect of two-way vibration damping frequency adjustment.

Description

A kind of bidirectional tuned mass damper for air rail track beam

technical field

The invention relates to the technical field of rail transportation, in particular to a special bidirectional tuned mass damper for an empty rail track beam.

Background technique

The air rail, also known as the suspended monorail, has the characteristics of low cost, small footprint and less impact on the urban landscape. At present, many cities in China are planning the construction of air rail. The empty rail track beam is not only the load-bearing structure of the vehicle but also the track when the train is running. It has multiple functions such as bearing, guiding and stabilizing the vehicle. The air rail track beam is a steel structure open thin-walled box girder, and its mass per unit length, structural damping ratio, lateral stiffness and torsional stiffness are all small.

The dynamic vibration absorber studied by Frahm in 1909 is mainly used to control the vibration in the mechanical field, and the concept of the application of the tuned mass damper to the structural vibration reduction also originates from this. When the main structure vibrates due to the dynamic load, the mass element of the TMD attached to the main structure vibrates in the opposite direction due to inertia, exerting a force opposite to the vibration direction to the main structure, and adding the energy dissipation effect of the damping element, so that the main structure The vibration is significantly attenuated. Tuned mass dampers have been proved to have a significant inhibitory effect on wind-induced vibration of structures, and are currently widely used in civil, mechanical and other fields.

The existing air rail track beam vibration reduction equipment is rare, mainly divided into two categories: one is to embed vibration and noise reduction materials in the web and bottom plate of the rail beam to improve energy dissipation efficiency and sound insulation effect; The additional connection device between the two beams can achieve the purpose of vibration reduction by increasing the overall lateral stiffness. However, the above two types of vibration damping equipment still have certain technical defects: for example, the former adopts the method of continuously embedding glass wool and other sound insulation materials and coating damping alloys, which will greatly increase the construction cost and is difficult to control; the latter discretely connects two pieces of flexible rails Beam, focusing on solving the vibration problem caused by lateral dynamic load, which may lead to the uneven phenomenon of vertical stiffness under driving conditions, and safety hazards such as the opening of the bottom of the thin-walled box beam being rigidly enlarged. Therefore, it is very important to develop a special vibration reduction device for air rail track beams with two-way vibration reduction and controllable cost.

SUMMARY OF THE INVENTION

The present invention provides a special bidirectional tuned mass damper for an empty rail track beam, which is used to suppress the structural vibration of the track structure caused by cross wind, driving, landscape pedestrian bridges and cornering, etc. , The stiffness is adjustable.

The special bidirectional tuned mass damper for the air rail track beam of the present invention has the advantages of adjustable damping and stiffness, strong energy dissipation capability, light total mass, and small required implementation space.

The object of the present invention can be realized through the following technical solutions:

The invention provides a two-way tuned mass damper dedicated to an empty rail track beam, comprising an embracing shell, a lateral guide rail, a box, a lateral shock absorber, a vertical guide rail, a tuned mass block and a vertical shock absorber, wherein the embracing The casing is arranged above the empty rail track beam, the lateral guide rails are arranged at the upper and lower ends of the inside of the holding casing, the box body is located in the holding casing, and is slidably connected to the lateral guide rails, and the lateral shock absorber is located in the holding casing and is arranged in the holding casing. On both sides of the box body, one end is connected to the side wall of the box body, and the other end is connected to the side wall of the holding shell. The shock absorber is located in the box, one end is connected with the tuning mass block, and the other end is connected with the top of the box body. The vertical shock absorber and the tuning mass block form a vertical vibration reduction system, and the lateral shock absorber and the box body constitute For a lateral vibration damping system, the box body and the internal vertical vibration damping system as a whole serve as a mass block in the lateral vibration damping system.

In the present invention, the embracing shell and the empty rail track beam connected under the embracing shell constitute a vibration load mechanism.

In the present invention, the vertical guide rail and the lateral guide rail constitute a guide mechanism.

In the present invention, the vertical vibration damping system and the lateral vibration damping system constitute a vibration damping mechanism.

In the present invention, the vertical vibration damping system and the lateral vibration damping system are independent of each other, and the performance of lateral stiffness and damping and vertical stiffness and damping do not interfere with each other.

In the present invention, the tuned mass damper is mainly composed of a vibration load mechanism, a guide mechanism and a vibration damping mechanism. Through the adjustment of the vibration load mechanism and the vibration damping mechanism, the natural frequency of the damper in two directions is equal to the low-order resonance frequency of the rail beam. approach, in order to achieve the purpose of reducing the two-way vibration of the track beam under the coupling action of multiple factors such as driving load and cross-wind load.

In an embodiment of the present invention, four groups of the vertical vibration dampers are generally arranged, which are arranged diagonally in the box. One end of the vertical vibration damper is connected to the tuning mass, and the other end is connected to the box through a cover plate. top connection. The vertical damping and stiffness can be adjusted by changing the number of vertical shock absorbers.

In an embodiment of the present invention, the vertical vibration damper includes a damper and a spring, one end of the damper in the vertical vibration damper is connected to the tuning mass, and the other end is connected to the top of the box through a cover plate , the spring selects one of the following installation methods or adopts both at the same time:

Metal collars are arranged at both ends of the damper, and the spring is sleeved between the metal collars on the outer surface of the damper, or,

The spring is not sleeved outside the damper, one end of the spring is directly connected to the tuning mass block, and the other end is connected to the top of the box through the cover plate.

The stiffness can be adjusted by changing the type and number of springs. Adjustable quality can be achieved by changing the number of tuned mass blocks.

In one embodiment of the present invention, the cover plate and the box are connected by bolts, the damper and the tuning mass are connected by bolts, and the damper and the cover plate are connected by bolts.

In one embodiment of the present invention, multiple sets of the transverse shock absorbers can be arranged, and are arranged in parallel on both sides of the box body, one end of the transverse shock absorber is connected to the side wall of the box body, and the other end is connected to the side wall of the enclosing shell. connect. The lateral damping and stiffness can be adjusted by changing the number of sets of lateral shock absorbers.

In one embodiment of the present invention, the transverse shock absorber includes a damper and a spring, one end of the damper in the transverse shock absorber is connected to the side wall of the box body, and the other end is connected to the side wall of the carrying shell, so For the spring, choose one of the following installation methods or use both at the same time:

Metal collars are arranged at both ends of the damper, and the spring is sleeved between the metal collars on the outer surface of the damper, or,

The spring is not sleeved outside the damper, and one end of the spring is directly connected with the side wall of the box body, and the other end is connected with the side wall of the holding shell.

The stiffness can be adjusted by changing the type and number of springs.

In the present invention, the entire box and the internal vertical vibration damping system are used as mass blocks in the lateral vibration damping system to achieve the effect of reducing the additional mass required by the lateral vibration damping system.

In an embodiment of the present invention, the damper is connected with the side wall of the box body by bolts, and the damper is connected with the side wall of the enclosing shell by bolts.

In an embodiment of the present invention, the vertical guide rails are located on four sides of the inner wall of the box, and the tuning mass block is provided with grooves on four sides to cooperate with the vertical guide rails in the box body and slide between the vertical guide rails friction. It is used to limit the non-vertical deflection of the tuning mass and reduce the friction between the box and the tuning mass.

In one embodiment of the present invention, the surrounding surface of the groove is wrapped with stainless steel, and sliding friction with the vertical guide rail, the contact surface is smooth, and the friction force can be greatly reduced.

In an embodiment of the present invention, the upper and lower ends of the box body are provided with concave grooves, which slide and rub against the transverse guide rails at the upper and lower ends of the holding shell.

In an embodiment of the present invention, the surrounding surface of the concave groove is wrapped with stainless steel, and sliding friction with the lateral guide rail, the contact surface is smooth, and the friction force can be greatly reduced.

In one embodiment of the present invention, the cladding shell and the empty rail track beam are connected by bolts.

Compared with the prior art, the beneficial effects of the present invention are as follows:

First, in the special bidirectional tuned mass damper for the air rail track beam of the present invention, the mass block of the lateral vibration damping system fully utilizes the overall mass of the vertical vibration damping system, thereby reducing the mass of the entire tuned mass damper.

Second, the special two-way tuning mass damper for the air rail track beam of the present invention adopts bolt connection as a whole, and has a simple structure. It can adjust the quality and damping of the vibration damping system in each direction by changing the type and quantity of the mass block, damper and spring. and stiffness effects.

Third, the special bidirectional tuned mass damper for the empty rail track beam of the present invention is connected to the empty rail track beam through the embracing shell, and the lateral vibration damping system is embedded in the embracing shell, which can suppress the lateral vibration caused by cross wind and cornering. At the same time, a vertical vibration reduction system is embedded in the box as a mass block in the lateral vibration reduction system, which is used to suppress the vertical vibration caused by driving and pedestrians, so as to achieve the effect of reducing the implementation space and overall structural burden.

In the special bidirectional tuned mass damper for the air rail track beam of the present invention, the vertical vibration damping system is installed inside the box of the lateral vibration damping system, and the mass of the vertical vibration damping system is fully utilized to achieve the effect of reducing the quality of the entire tuning mass damper. ; Through bolt connection, the type and quantity of mass block, damper and spring can be easily replaced to achieve the effect of adjustable quality, damping and stiffness; The vibration system is embedded in the box of the lateral vibration reduction system, so that the performance of the two vibration reduction systems does not interfere with each other, the structural burden is reduced, and the installation space is small. Of course, it is not necessary for any product embodying the present invention to achieve all of the above-described advantages simultaneously.

Description of drawings

Fig. 1 is the partial exploded structure schematic diagram of the special bidirectional tuning mass damper of the hollow rail track beam in Example 1;

FIG. 2 is a schematic structural diagram of a lateral shock absorber or a vertical shock absorber in Embodiment 1;

FIG. 3 is a schematic structural diagram of a lateral shock absorber or a vertical shock absorber in Embodiment 2. FIG.

Labels in the figure: 1, lateral guide rail, 2, lateral shock absorber, 3, tuning mass, 4, vertical shock absorber, 5, bolt, 6, cover plate, 7, vertical guide rail, 8, box, 9. Holding shell, 10. Empty rail track beam, 401, metal collar, 402, damper, 403, spring.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

Referring to FIG. 1 , this embodiment provides a two-way tuned mass damper dedicated to an empty rail track beam, including an embracing housing 9 , a lateral guide rail 1 , a box body 8 , a lateral shock absorber 2 , a vertical guide rail 7 , and a tuned mass block 3 And the vertical shock absorber 4, wherein, the holding shell 9 is arranged on the top of the empty rail track beam 10, the transverse guide rail 1 is arranged on the upper and lower ends of the inside of the holding shell 9, the box body 8 is located in the holding shell 9, and slides Connected to the lateral guide rail 1, the lateral shock absorber 2 is located in the holding shell 9, and is arranged on both sides of the box body 8, one end is connected with the side wall of the box body 8, and the other end is connected with the side wall of the holding shell 9. The guide rail 7 is arranged on the inner wall of the box body 8, the tuning mass block 3 is located in the box body 8, and is slidably connected to the vertical guide rail 7, and the vertical vibration damper 4 is located in the box body 8, one end is connected with the tuning mass block 3, and the other end is connected with the tuning mass block 3. Connected with the top of the box body 8, the vertical vibration damper 4 and the tuning mass block 3 form a vertical vibration damping system, the lateral vibration damper 2 and the box body 8 constitute a lateral vibration damping system, and the box body 8 and The internal vertical vibration damping system as a whole acts as a mass block in the lateral vibration damping system.

In this embodiment, the embracing shell 9 and the empty rail rail beam 10 connected under the embracing shell 9 constitute a vibration load mechanism.

In this embodiment, the vertical guide rail 7 and the lateral guide rail 1 constitute a guide mechanism.

In this embodiment, the vertical vibration damping system and the lateral vibration damping system constitute a vibration damping mechanism.

In this embodiment, the vertical vibration damping system and the lateral vibration damping system are independent of each other, and the performance of lateral stiffness and damping and vertical stiffness and damping do not interfere with each other.

In this embodiment, the tuned mass damper is mainly composed of a vibration load mechanism, a guide mechanism and a vibration reduction mechanism. Through the adjustment of the vibration load mechanism and the vibration reduction mechanism, the natural frequencies of the damper in two directions are made to resonate with the low-order rail beam. The frequency is close to achieve the purpose of reducing the two-way vibration of the track beam under the coupling action of multiple factors such as driving load and cross-wind load.

In this embodiment, four groups of the vertical vibration dampers 4 are provided, which are arranged diagonally in the box body 8 . One end of the vertical vibration dampers 4 is connected to the tuning mass block 3 , and the other end is connected to the box through the cover plate 6 . Body 8 is connected at the top. The effect of vertical damping and adjustable stiffness can be achieved by changing the number of groups of vertical shock absorbers 4 .

Referring to FIG. 2 , in this embodiment, the vertical shock absorber 4 includes a damper 402 and a spring 403 . One end of the damper 402 in the vertical shock absorber 4 is connected to the tuning mass 3 , and the other end is connected through a cover The plate 6 is connected to the top of the box 8 , the two ends of the damper 402 are provided with metal collars 401 , and the spring 403 is sleeved between the metal collars 401 on the outer surface of the damper 402 .

The stiffness can be adjusted by changing the type and quantity of the springs 403 . Adjustable quality can be achieved by changing the number of tuning mass blocks 3 .

In this embodiment, the cover plate 6 and the box 8 are connected by bolts 5 , the damper 402 and the tuning mass 3 are connected by bolts 5 , and the damper 402 and the cover plate 6 are connected by bolts 5 . Bolt 5 connection.

The transverse shock absorbers 2 can be arranged in multiple groups and are arranged in parallel on both sides of the box body 8 . The effect of adjustable lateral damping and stiffness can be achieved by changing the number of sets of lateral shock absorbers 2 .

Referring to FIG. 2 , in this embodiment, the lateral shock absorber 2 includes a damper 402 and a spring 403 . One end of the damper 402 in the lateral shock absorber 2 is connected to the side wall of the box body 8 , and the other end is connected to the holding device. The side walls of the housing 9 are connected, the two ends of the damper 402 are provided with metal collars 401 , and the spring 403 is sleeved between the metal collars 401 on the outer surface of the damper 402 . The stiffness can be adjusted by changing the type and quantity of the springs 403 .

In this embodiment, the box body 8 and the entire internal vertical vibration damping system are used as mass blocks in the lateral vibration damping system to achieve the effect of reducing the additional mass required by the lateral vibration damping system.

In this embodiment, the damper 402 and the side wall of the box body 8 are connected by bolts 5 , and the damper 402 and the side wall of the holding shell 9 are connected by bolts 5 .

In this embodiment, the vertical guide rails 7 are located on the four sides of the inner wall of the box body 8 , and the tuning mass block 3 is provided with grooves on four sides to cooperate with the vertical guide rails 7 in the box body 8 and connect with the vertical guide rails 7 . sliding friction. It is used to limit the non-vertical deflection of the tuning mass and reduce the friction between the box and the tuning mass.

In this embodiment, the surrounding surface of the groove is wrapped with stainless steel, sliding friction with the vertical guide rail, the contact surface is smooth, and the friction force can be greatly reduced.

In this embodiment, the upper and lower ends of the box body 8 are provided with concave grooves, which slide and rub against the transverse guide rails 1 at the upper and lower ends of the holding shell 9 .

In this embodiment, the surrounding surface of the concave groove is wrapped with stainless steel, and sliding friction with the lateral guide rail, the contact surface is smooth, and the friction force can be greatly reduced.

In this embodiment, the clasping shell 9 and the empty rail track beam 10 are connected by bolts 5 .

In the special bidirectional tuned mass damper for the air rail track beam in this embodiment, the mass block of the lateral vibration damping system fully utilizes the overall mass of the vertical vibration damping system, thereby reducing the mass of the entire tuned mass damper.

The two-way tuned mass damper dedicated to the air rail track beam in this embodiment is bolted as a whole and has a simple structure. The mass, damping and stiffness of the all-directional vibration damping system can be adjusted by changing the type and quantity of mass blocks, dampers and springs. Effect.

The two-way tuned mass damper dedicated to the air rail track beam in this embodiment is connected to the air rail track beam through an embracing shell, and a lateral vibration damping system is embedded in the embracing shell, which can suppress the lateral vibration caused by cross wind and cornering. At the same time, a vertical vibration damping system is embedded in the box as a mass block in the lateral vibration damping system, which is used to suppress the vertical vibration generated by driving and pedestrians, so as to achieve the effect of reducing the implementation space and overall structural burden.

In the two-way tuned mass damper dedicated to the air rail track beam in this embodiment, the vertical vibration damping system is installed inside the box of the lateral vibration damping system, and the mass of the vertical vibration damping system is fully utilized to reduce the mass of the entire tuned mass damper. Effect; through bolt connection, the type and quantity of mass block, damper and spring can be easily replaced to achieve the effect of adjustable quality, damping and stiffness; the tuned mass damper is connected to the upper surface of the track beam through the holding shell, and the vertical direction The vibration reduction system is embedded in the box of the lateral vibration reduction system, so that the performance of the two vibration reduction systems does not interfere with each other, the structural burden is reduced, and the installation space is small. Of course, any product implementing this embodiment does not necessarily need to achieve all of the advantages described above at the same time.

Example 2

The difference from Embodiment 1 is that, referring to FIG. 3 , in this embodiment, the vertical shock absorber 4 includes a damper 402 and a spring 403 , and one end of the damper 402 in the vertical shock absorber 4 is connected to the tuning The mass block 3 is connected, the other end is connected to the top of the box 8 through the cover plate 6, the spring 403 is not sleeved outside the damper 402, one end of the spring 403 is connected to the tuning mass 3 through the metal collar 401, and the other end is It is connected with the top of the box body 8 through the metal collar 401 and the cover plate 6 .

Referring to FIG. 3 , the lateral shock absorber 2 includes a damper 402 and a spring 403 , one end of the damper 402 in the lateral shock absorber 2 is connected to the side wall of the box body 8 , and the other end is connected to the side wall of the holding shell 9 , the spring 403 is not sleeved outside the damper 402 , one end of the spring 403 is connected to the side wall of the box body 8 through the metal collar 401 , and the other end is connected to the side wall of the holding shell 9 through the metal collar 401 .

Except for this, the other structures are the same as those in Example 1.

The foregoing description of the embodiments is provided to facilitate understanding and use of the invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the generic principles described herein can be applied to other embodiments without inventive step. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (10)

1. a special two-way tuning mass damper for air rail track beam, is characterized in that, comprises: Holding shell (9): set above the empty rail track beam (10), Lateral guide rails (1): arranged at the upper and lower ends of the inside of the holding shell (9), Box (8): It is located in the holding shell (9) and is slidably connected to the transverse guide rail (1), Lateral shock absorber (2): located in the holding shell (9), arranged on both sides of the box body (8), one end is connected to the side wall of the box body (8), and the other end is connected to the side wall of the holding shell (9) connect, Vertical guide rail (7): arranged on the inner wall of the box body (8), Tuning mass (3): located in the box (8), slidingly connected to the vertical guide rail (7), Vertical shock absorber (4): located in the box (8), one end is connected to the tuning mass (3), the other end is connected to the top of the box (8), The vertical vibration damper (4) and the tuning mass block (3) form a vertical vibration damping system, The lateral vibration damper (2) and the box body (8) constitute a lateral vibration damping system, and the box body (8) and the internal vertical vibration damping system as a whole serve as a mass block in the lateral vibration damping system. 2. The special two-way tuning mass damper for empty rail track beam according to claim 1, characterized in that, the vertical vibration dampers (4) are provided with 4 groups, which are diagonally provided in the box body (8), and the One end of the vertical shock absorber (4) is connected with the tuning mass block (3), and the other end is connected with the top of the box body (8) through the cover plate (6). 3. The special bidirectionally tuned mass damper for air rail track beams according to claim 1, wherein the vertical vibration damper (4) comprises a damper (402) and a spring (403), One end of the damper (402) in the vertical vibration damper (4) is connected to the tuning mass block (3), and the other end is connected to the top of the box (8) through the cover plate (6), For the spring (403), choose one of the following installation methods or use both at the same time: Metal collars (401) are arranged at both ends of the damper (402), and the spring (403) is sleeved between the metal collars (401) on the outer surface of the damper (402), or, One end of the spring (403) is connected with the tuning mass block (3), and the other end is connected with the top of the box body (8) through the cover plate (6). 4. The two-way tuned mass damper specially used for the air rail track beam according to claim 2 or 3, characterized in that, the cover plate (6) and the box body (8) are connected by bolts (5), and the damping The damper (402) and the tuning mass (3) are connected by bolts (5), and the damper (402) and the cover plate (6) are connected by bolts (5). 5. The special bidirectional tuned mass damper for air rail track beams according to claim 1, characterized in that, the transverse shock absorbers (2) are provided in multiple groups, and are arranged in parallel on both sides of the box (8), and the transverse dampers (2) are arranged in parallel on both sides of the box body (8). One end of the shock absorber (2) is connected with the side wall of the box body (8), and the other end is connected with the side wall of the holding shell (9). 6. The special bidirectional tuned mass damper for an air rail track beam according to claim 1, wherein the lateral vibration damper (2) comprises a damper (402) and a spring (403), One end of the damper (402) in the transverse shock absorber (2) is connected to the side wall of the box body (8), and the other end is connected to the side wall of the holding shell (9), For the spring (403), choose one of the following installation methods or use both at the same time: Metal collars (401) are arranged at both ends of the damper (402), and the spring (403) is sleeved between the metal collars (401) on the outer surface of the damper (402), or, One end of the spring (403) is connected with the side wall of the box body (8), and the other end is connected with the side wall of the holding shell (9). 7. The special two-way tuned mass damper for air rail track beams according to claim 5 or 6, wherein the damper (402) is connected with the side wall of the box body (8) by bolts (5), so The damper (402) is connected with the side wall of the holding shell (9) by bolts (5). 8. The special two-way tuning mass damper for empty rail track beams according to claim 1, wherein the vertical guide rail (7) is located on four sides of the inner wall of the box (8), and the tuning mass block (3) is provided on four sides. There are grooves for cooperating with the vertical guide rails (7) in the box body (8) and sliding friction with the vertical guide rails (7). 9. The special two-way tuning mass damper for the empty rail track beam according to claim 1, characterized in that, the upper and lower ends of the box body (8) are provided with concave grooves, and the transverse guide rails ( 1) sliding friction between. 10 . The two-way tuned mass damper dedicated to the air rail track beam according to claim 1 , wherein the mounting shell ( 9 ) and the air rail track beam ( 10 ) are connected by bolts ( 5 ). 11 .

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