CN112112003A

CN112112003A - Wide-frequency vibration-damping floating slab track

Info

Publication number: CN112112003A
Application number: CN202011123299.1A
Authority: CN
Inventors: 周锐; 袁文豪; 杜彦良; 任伟新; 盛曦; 张颖
Original assignee: Shenzhen University
Current assignee: Shenzhen University
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2020-12-22

Abstract

The invention relates to a broadband vibration reduction floating slab track, which comprises: a ballast bed; the track slab is arranged on the track bed; a rail connected to the rail plate; a fastener fastening the rail to the rail plate; the vibration damping pad is arranged between the track bed and the track slab; the inerter vibration reduction assembly is arranged in the track plate and is used for vibration isolation; the inerter vibration reduction assembly comprises an inerter, an elastic piece and a damper, wherein the elastic piece is arranged in the damper, and the inerter and the damper are connected in series or in parallel. The wide-frequency vibration reduction floating slab track is connected with the inertial container and the damper in series or in parallel to form a mass-spring-inertial container-damping vibration reduction system, so that the vibration reduction and isolation performance of the wide-frequency vibration reduction floating slab track at low frequency is improved.

Description

Wide-frequency vibration-damping floating slab track

Technical Field

The invention relates to the technical field of rail transit, in particular to a broadband vibration reduction floating slab rail.

Background

Among the current floating slab track structure, be equipped with the damping pad between railway roadbed and the track board, the damping pad is mostly attached in the track board outside and is located between railway roadbed and the track board in the individual layer, and the rubber damping pad is ageing easily, just needs whole the change after the damping pad is ageing or damaged, and low frequency (especially when being less than 15 Hz) damping performance is relatively poor, and the low frequency damping that the floating slab caused under normal operation train load and high frequency damping performance still remain to be promoted.

Disclosure of Invention

Therefore, it is necessary to provide a broadband vibration-damping floating slab track for solving the problem of poor vibration-damping performance of the floating slab track.

A broadband vibration-damped floating slab track, comprising:

a ballast bed;

the track slab is arranged on the track bed;

a rail connected to the rail plate;

a fastener fastening the rail to the rail plate;

the vibration damping pad is arranged between the track bed and the track slab; and

the inerter vibration reduction assembly is arranged in the track plate and is used for vibration isolation; the inerter vibration reduction assembly comprises an inerter, an elastic piece and a damper, wherein the elastic piece is arranged in the damper, and the inerter and the damper are connected in series or in parallel.

The wide-frequency vibration reduction floating slab track is connected with the inerter and the damper in series or in parallel to form a mass-spring-inerter-damping vibration reduction system, so that the energy transmitted to the wide-frequency vibration reduction floating slab track from the dynamic load of a vehicle is accelerated and dissipated, and the high-frequency and low-frequency vibration reduction and isolation performance of the wide-frequency vibration reduction floating slab track is improved; the vibration reduction pad and the inertial container vibration reduction assembly are mutually complemented, so that respective vibration reduction functions are fully exerted, and the vibration reduction and isolation effect is further achieved.

In one embodiment, the inerter comprises a first box body and an inerter transmission member, the first box body is fixed in the track plate, and the inerter transmission member penetrates through the first box body, is connected with the damper and can move relative to the first box body.

In one embodiment, the inertia accommodating transmission part comprises a screw rod, a nut and a flywheel, the nut and the flywheel are arranged in the first box body, the flywheel is fixedly connected with the nut, the nut is sleeved outside the screw rod, and the screw rod penetrates through the first box body and is connected with the damper; when the inertia capacity driving piece drives the screw rod to move axially, the nut can be driven to rotate around the screw rod and drive the flywheel to rotate.

In one embodiment, the damper includes a second box, a damping fluid and a piston, the damping fluid is loaded in the second box, the piston is disposed in the second box, the lead screw penetrates through the second box and is fixedly connected to the piston, the elastic member is abutted between the piston and an inner wall of the second box, and the second box is fixed in the track plate and is spaced from the first box, so that the inerter is connected in series with the damper.

In one embodiment, the damper includes a second box, a damping fluid and a piston, the damping fluid is loaded in the second box, the piston is disposed in the second box, the lead screw penetrates through the second box and is fixedly connected with the piston, the elastic element is abutted between the piston and an inner wall of the second box, and the second box is fixed in the track plate and is fixedly connected with the first box, so that the inerter is connected with the damper in parallel.

In one embodiment, the number of the inerter damping assemblies can be multiple, and the plurality of inerter damping assemblies are connected in series and then arranged in the track plate.

In one embodiment, the damping pad comprises a plurality of first damping pads and a plurality of second damping pads, the first damping pads and the second damping pads have different durability and damping performance, and the first damping pads and the second damping pads are connected to the outer side of the track plate in an array structure.

In one embodiment, the first and second damping pads are in a dot, block or linear structure, so that the first and second damping pads are in any one of a dot array, a block array and a linear array.

In one embodiment, the first vibration reduction pads and the second vibration reduction pads are in any two of a point-shaped structure, a block-shaped structure or a linear structure, so that the first vibration reduction pads and the second vibration reduction pads are arranged in any two of a point-shaped array, a block-shaped array and a linear array.

In one embodiment, the first and second damping pads may be further adhered together to form an intermediate member, the intermediate member having a stacked structure, and a plurality of intermediate members connected to the outside of the track plate in an array structure.

Drawings

FIG. 1 is a schematic diagram of a partial structure of a broadband vibration-damping floating slab track in an embodiment;

FIG. 2 is a schematic view of a partial structure of a broadband vibration-damping floating slab track in another embodiment;

FIG. 3 is a schematic structural diagram of an inerter damping assembly according to an embodiment;

FIG. 4 is a schematic structural diagram of an inerter damping assembly in another embodiment;

fig. 5 is a schematic diagram of a combination of the damping member, the inerter damping assembly and the track plate according to an embodiment.

Reference numerals:

100. a ballast bed; 101. a gap; 200. a track plate; 210. a top surface; 220. a bottom surface; 230. a first side surface; 240. a second side surface; 300. a steel rail; 400. a fastener; 500. an inerter damping assembly; 510. an inerter; 511. a first case; 512. an inerter drive member; 513. a screw rod; 514. a nut; 515. a flywheel; 520. an elastic member; 530. a damper; 531. a second case; 532. damping fluid; 533. a piston; 600. a vibration damping pad; 601. a middleware; 610. a first vibration damping pad; 620. a second damping pad.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, the broadband vibration damping floating slab track in an embodiment includes a track bed 100, a track slab 200, a steel rail 300, a fastener 400, a inertial volume vibration damping assembly 500, and a vibration damping pad 600. The track slab 200 is arranged on the track bed 100, the steel rail 300 is connected to the track slab 200, the fastener 400 fastens the steel rail 300 to the track slab 200, the vibration damping pad 600 is arranged between the track bed 100 and the track slab 200, and the inertial volume vibration damping assembly 500 is arranged in the track slab 200.

The inerter vibration reduction assembly comprises an inerter 510, an elastic piece 520 and a damper 530, wherein the elastic piece 520 is arranged in the damper 530, and the inerter 510 and the damper 530 are connected in series or in parallel.

The inerter 510 and the damper 530 are connected in series or in parallel to form a mass-spring-inerter-damping vibration attenuation system, so that the energy transmitted to the broadband vibration attenuation floating slab track by the dynamic load of the vehicle is accelerated and dissipated, and the high-frequency and low-frequency vibration attenuation and isolation performance of the broadband vibration attenuation floating slab track is improved; by complementing the steel vibration damping pad 300 and the inertia capacity vibration damping assembly 500, respective vibration damping functions of the steel vibration damping pad 300 and the inertia capacity vibration damping assembly 500 are fully exerted, and the vibration damping and isolating effects are further achieved.

In a specific embodiment, the elastic member 520 is a steel spring having a relatively high stiffness. For example, the damping coefficient of the steel spring is 80000N · s/m, and the spacing between the coils of the steel spring is 1.25m, so as to better meet the use requirement.

In the embodiment shown in fig. 3, the inerter 510 includes a first box 511 and an inerter transmission element 512, the first box 511 is fixed in the track slab 200, and the inerter transmission element 512 penetrates through the first box 511 and is connected to the damper 530.

Specifically, the inertia capacity transmission member 512 comprises a screw 513, a nut 514 and a flywheel 515, the nut 514 and the flywheel 515 are arranged in the first box 511, the flywheel 515 is fixedly connected with the nut 514, the nut 514 is sleeved outside the screw 513, and the screw 513 penetrates through the first box 511 and is connected with the damper 530. When the screw 513 is driven to move axially by an external force, the nut 514 can be driven to rotate around the screw 513, and the flywheel 515 is driven to rotate, so that the inertia force of the track plate 200 is amplified, and a low-frequency vibration reduction effect is achieved.

In a specific embodiment, inerter 510 is a ball screw inerter 510. In other embodiments, inerter 510 can also be a rack and pinion inerter 510 or a hydraulic inerter 510.

Referring to fig. 3, the damper 530 includes a second case 531, a damping fluid 532 and a piston 533, the damping fluid 532 is loaded in the second case 531, the piston 533 is disposed in the second case 531, the screw 513 is disposed through the second case 531 and fixedly connected to the piston 533, and the elastic element 520 is supported between the piston 533 and an inner wall of the second case 531.

In one embodiment, as shown in fig. 3, the second housing 531 is fixed in the track plate 200 and spaced apart from the first housing 511, such that the inerter 510 is connected in series with the damper 530.

In this embodiment, the screw 513 of the inerter 510 is connected to the piston 533 of the damper 530, and accordingly, one end of the screw 513 is connected to one end of the piston 533, and the other end of the screw 513 and the other end of the piston 533 are freely movable. When the broadband vibration-damping floating slab track is loaded by a train, the inertial container 510 moves vertically to drive the piston 533 and the lead screw 513 to move vertically, so that the nut 514 and the flywheel 515 can be driven to rotate; after the train passes by, the elastic element 520 moves in the vertical direction, so as to drive the piston 533 and the lead screw 513 to move in the vertical direction, and also drive the nut 514 and the flywheel 515 to rotate; the inertance characteristic is implemented to amplify the inertial force of the track slab 200 and the damping effect is implemented to enhance the low and high frequency vibration damping effect.

In another embodiment, referring to fig. 4, the second housing 531 is fixed in the track plate 200 and is fixedly connected to the first housing 511, so that the inerter 510 is connected in parallel to the damper 530.

In this embodiment, the screw 513 of the inerter 510 is connected to the piston 533 of the damper 530, the second housing 531 is fixed in the track plate 200 and is fixedly connected to the first housing 511, the second housing 531 of the inerter 510 is regarded as one end point, and the screw 513 of the inerter 510 is regarded as the other end point. When the broadband vibration-damping floating slab track is loaded by a train and two end points move relatively, the piston 533 and the screw 513 move vertically; after the train passes by, the two end points move relatively to return to the original position, so as to drive the piston 533 and the lead screw 513 to move in the vertical direction, and also drive the nut 514 and the flywheel 515 to rotate, thereby realizing the inertial capacitance characteristic to amplify the inertial force of the track slab 200, and realizing the damping effect to enhance the low-frequency and high-frequency vibration damping effects.

It should be noted that the first case 511 and the second case 531 may be of an integral structure or a split structure.

In other embodiments, the number of inertial volume damping assemblies 500 may be multiple, and multiple inertial volume damping assemblies 500 are connected in series and then disposed in the track plate 200.

In this embodiment, the inerter damping assembly 500 is a multistage series connection, and when the broadband damping floating slab track is loaded by a train, the damping effect of a high frequency band can be maintained, and the damping can be effectively performed at a low frequency band to suppress train resonance, so as to improve the riding comfort of the train.

Referring to fig. 1, the damping pad 600 includes a plurality of first damping pads 610 and a plurality of second damping pads 620, the first damping pads 610 and the second damping pads 620 have different durability and damping performance, and the plurality of first damping pads 610 and the plurality of second damping pads 620 are connected to the outer side of the track plate 200 in an array structure.

The vibration damping pad 600 is connected to the outer side of the track slab 200 in an array structure, so that the integral sheet-shaped installation mode of the vibration damping pad 600 in the traditional structure is improved, the material consumption of the vibration damping pad 600 is reduced, and the installation, adjustment and replacement of the vibration damping pad 600 are facilitated; through setting up the vibration damping pad 600 that two kinds of durability and damping performance are different, can rationally arrange the demand of combining two kinds of vibration damping pads 600 in order to satisfy actual vibration isolation, application scope is wider, and does benefit to practices thrift the cost.

It should be noted that there is a gap 101 between the track slab 200 and the track bed 100, for example, the gap is 30mm, so that when the broadband vibration damping floating slab track is subjected to train load, the track slab 200 has a deformation space and is beneficial to vibration damping. The inerter vibration damping assembly 100 is disposed in the track slab 200 and at least partially exposed out of the track slab 200, and the part of the inerter vibration damping assembly 100 exposed out of the track slab 200 is connected to the ballast bed 100.

In one embodiment, as shown in fig. 1, the damping pad 600 is disposed at the gap between the track slab 200 and the track bed 100, and the damping pad 600 is disposed at a position offset from the inertial volume damping module 500. Through the arrangement, the vibration damping pad 600 is positioned at the gap to achieve a good vibration damping and isolating effect.

In another embodiment, as shown in fig. 2, the damping pad 600 is disposed at a gap between the track slab 200 and the track bed 100, and the inertia damping assembly 500 and the damping pad 600 are at least partially overlapped, so that the inertia damping assembly 500 is not exposed between the gap between the track slab 200 and the track bed 100, which is beneficial to improving the service life of the inertia damping assembly 500, and the inertia damping assembly 500 and the damping pad 600 are combined to enhance the damping effect.

Specifically, in some embodiments, as shown in fig. 5, the first vibration damping pad 610 and the second vibration damping pad 620 are each in a dot, block or linear structure, such that the plurality of first vibration damping pads 610 and the plurality of second vibration damping pads 620 are in one of a dot array, a block array and a linear array.

It should be noted that the dot-shaped structures and the block-shaped structures herein are only different in size, that is, the block size is slightly larger than the dot-shaped size, and the dot-shaped structures and the block-shaped structures include circular, oval, rectangular, square, or other irregular shapes, and the dot-shaped structures and the block-shaped structures are not limited in shape herein. The linear structure includes a long linear shape or a long wave shape.

Here, the array structure may be a circular array, a rectangular array, or other irregular array. The array structure may be such that a plurality of rows of the first vibration damping pads 610 and a plurality of rows of the second vibration damping pads 620 are alternately arranged in sequence, or a single first vibration damping pad 610 and a single second vibration damping pad 620 are alternately arranged in sequence. As long as a plurality of first damping pad 610 and a plurality of second damping pad 620 interval set up and scatter, can effectively reduce vibration and fall make an uproar can, concrete arrangement mode can adjust according to actual need.

In other embodiments, the first vibration damping pad 610 and the second vibration damping pad 620 have any two of a dot-shaped structure, a block-shaped structure or a linear structure, so that the plurality of first vibration damping pads 610 and the plurality of second vibration damping pads 620 are arranged in any two of a dot-shaped array, a block-shaped array and a linear array.

For example, referring to fig. 5, the first vibration damping pad 610 has a dot structure, the second vibration damping pad 620 has a linear structure, the first vibration damping pads 610 and the second vibration damping pads 620 can be arranged in a dotted-line combination manner, the second vibration damping pads 620 can be disposed at a large outer side area of the track plate 200, the first vibration damping pads 610 can be disposed at corners of the track plate 200 or gaps of the second vibration damping pads 620, so that the position of the vibration damping member can be flexibly adjusted, the material cost can be saved for surface support, and the vibration damping and noise reduction can be effectively performed.

In other embodiments, the first and second damping

pads

610 and 620 may be adhered together to form the intermediate member 601, the intermediate member 601 may be in a stacked structure, and a plurality of intermediate members 601 may be connected to the outside of the track plate 200 in an array structure.

It can be understood that the laminated structure can have a better vibration damping effect since the laminated structure is thicker than the single-layered structure. In a specific embodiment, a reinforcing fiber layer may be further disposed between the first vibration damping pad 610 and the second vibration damping pad 620, so that the first vibration damping pad 610 and the second vibration damping pad 620 are effectively connected, the track slab 200 is effectively supported, and vibration damping and noise reduction performance is improved.

For example, as described with reference to fig. 2 and 5, the track slab 200 includes a rear surface 210, a front surface 220, a first side surface 230, and a second side surface 240, the front surface 220, the first side surface 230, and the second side surface 240 abut against the track bed 100 via a damping member, an intermediate member 601 is provided on the rear surface 210 and the front surface 220, and the first side surface 230 and the second side surface 240 are provided with a first damping pad 610 and/or a second damping pad 620. Because the front 220 and the rear 210 of the track slab 200 are subjected to larger axial pressure, the intermediate piece 601 has a double-layer laminated structure or a multilayer alternative laminated arrangement, so that better vibration and noise reduction effects can be achieved; the first side 230 and the second side 240 may be provided with a vibration damping pad 600 having a single layer structure or a multi-layer structure as needed to further damp vibration.

The intermediate member 601 may be disposed at a position of the track slab 200 close to the inertia damping assembly 500, so as to combine with the inertia damping assembly 500 to damp, thereby achieving better damping effect for different frequency bands.

In a specific embodiment, first damping pad 610 material is rubber, second damping pad 620 material is polyurethane, polyurethane damping pad 600's mechanical strength is high, durability and damping nature are all superior to rubber, polyurethane is difficult to ageing, wear resistance is good, elasticity is good, hardness is high, resistant oil, resistant solvent, can set up the polyurethane pad in the great department of pressure or to the higher section of damping/shake requirement, less department of pressure or the not high section of damping requirement set up the rubber pad, rationally adjust the mode of arranging of first damping pad 610 and second damping pad 620, do benefit to the life cycle that improves damping pad 600, reduce damping pad 600's change number of times.

In other embodiments, the first vibration damping pad 610 and the second vibration damping pad 620 may also be made of high-trans isoprene rubber or other high polymer material elastomers.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a wide band damping floating slab track which characterized in that includes:

a ballast bed;

the track slab is arranged on the track bed;

a rail connected to the rail plate;

a fastener fastening the rail to the rail plate;

2. The broadband vibration-damping floating slab track according to claim 1, wherein the inerter comprises a first box body and an inerter transmission member, the first box body is fixed in the track slab, and the inerter transmission member penetrates through the first box body, is connected with the damper and can move relative to the first box body.

3. The broadband vibration damping floating plate track according to claim 2, wherein the inertia-accommodating transmission member comprises a screw rod, a nut and a flywheel, the nut and the flywheel are arranged in the first box body, the flywheel is fixedly connected with the nut, the nut is sleeved outside the screw rod, and the screw rod penetrates through the first box body and is connected with the damper; when the inertia capacity driving piece drives the screw rod to move axially, the nut can be driven to rotate around the screw rod and drive the flywheel to rotate.

4. The broadband vibration damping floating plate rail according to claim 3, wherein the damper comprises a second box, a damping fluid and a piston, the damping fluid is loaded in the second box, the piston is arranged in the second box, the screw rod penetrates through the second box and is fixedly connected with the piston, the elastic element is abutted between the piston and the inner wall of the second box, and the second box is fixed in the rail plate and is arranged at an interval with the first box, so that the inertial container is connected with the damper in series.

5. The broadband vibration damping floating plate rail according to claim 3, wherein the damper comprises a second box, a damping fluid and a piston, the damping fluid is loaded in the second box, the piston is arranged in the second box, the screw rod penetrates through the second box and is fixedly connected with the piston, the elastic element is abutted between the piston and the inner wall of the second box, and the second box is fixed in the rail plate and is fixedly connected with the first box, so that the inertial container is connected with the damper in parallel.

6. The broadband vibration-damping floating slab track according to claim 1, wherein the number of the inertial volume vibration-damping assemblies can be multiple, and the multiple inertial volume vibration-damping assemblies are connected in series and then arranged in the track slab.

7. The broadband vibration-damped floating slab track according to claim 1, wherein said vibration-damping pads comprise a plurality of first vibration-damping pads and a plurality of second vibration-damping pads, said first vibration-damping pads and said second vibration-damping pads have different durability and vibration-damping performance, and said plurality of first vibration-damping pads and said plurality of second vibration-damping pads are connected to the outer side of said track slab in an array structure.

8. The broadband vibration damped floating slab track of claim 7 wherein said first and second vibration damping pads are each in a point, block or line configuration such that a plurality of said first and second vibration damping pads are in any one of a point array, a block array and a line array.

9. The broadband vibration-damped floating slab track according to claim 7 wherein said first and second vibration-damping pads are in any two of a point, block or linear configuration such that said plurality of first and second vibration-damping pads are arranged in any two of a point array, a block array and a linear array in combination.

10. The broadband vibration damped floating slab track according to claim 7 wherein said first and second vibration damping pads are further adhered together and form an intermediate member, said intermediate member being of a stacked configuration and a plurality of intermediate members being connected to the outside of said track slab in an array configuration.