CN113619629A

CN113619629A - Rail transit vehicle floor damping system

Info

Publication number: CN113619629A
Application number: CN202110897080.5A
Authority: CN
Inventors: 李鹏飞; 蔡明君; 王凯一; 陈阳明
Original assignee: CRRC Changchun Railway Vehicles Co Ltd
Current assignee: CRRC Changchun Railway Vehicles Co Ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2021-11-09

Abstract

The invention provides a rail transit vehicle floor vibration damping system which comprises a floating floor mounting structure, a vibration damping supporting structure and a noise reduction composite material, wherein the floating floor mounting structure comprises floor supporting beams and elastic vibration damping cushions, the floor supporting beams are fixedly connected to two sides of the upper surface of a vehicle body underframe, the elastic vibration damping cushions are arranged between the floor supporting beams and a floor, the vibration damping supporting structure comprises a plurality of supporting blocks which are uniformly arranged between the vehicle body underframe and the floor, each supporting block comprises a metal layer fixed on the upper surface of the vehicle body underframe, a damping layer is fixedly connected onto the metal layer, a vibration damping layer is arranged between the damping layer and the floor, and the noise reduction composite material is filled in a supporting block gap between the vehicle body underframe and the floor. The supporting blocks which are uniformly arranged through the vibration reduction supporting structures are used for dispersing stress, the requirements of floor settlement and noise reduction are met, and meanwhile, a high-performance noise reduction composite material is filled between the vehicle underframe and the built-in floor cavity to improve the noise reduction performance of the whole system.

Description

Rail transit vehicle floor damping system

Technical Field

The invention belongs to the technical field of rail vehicle manufacturing, and particularly relates to a floor vibration damping system for a rail transit vehicle.

Background

In the running process of the rail vehicle, due to the relative movement of the wheel rails of the vehicle, the running of a vehicle traction and braking system and the working of hoisting electrical equipment under the vehicle, the vibration and the noise transmitted from the underframe part of the rail vehicle to the passenger room are large, and the riding comfort of the rail vehicle is greatly reduced. In the prior art, only a vibration-damping noise-reducing material is simply added between a vehicle underframe and an interior floor to achieve the purpose of reducing vibration noise in a vehicle, but the vibration-damping noise-reducing material is limited by a mounting structure of a railway vehicle floor, and the vibration-damping noise-reducing performance of the railway vehicle is required to be further improved only by the development of the vibration-damping noise-reducing material with higher performance.

Disclosure of Invention

The invention aims to solve the problem that the damping and noise reduction of the existing floor mounting structure are limited, so that the floor damping system for the rail transit vehicle can effectively absorb vibration under the vehicle and isolate the transmission of external noise of a vehicle chassis to a passenger room, provides an effective means for improving the sound insulation, vibration reduction and noise reduction performance of the vehicle, and improves the riding comfort of the rail vehicle.

In order to achieve the purpose, the invention provides a rail transit vehicle floor vibration damping system which comprises a floating floor mounting structure, a vibration damping support structure and a noise reduction composite material, wherein the floating floor mounting structure comprises floor supporting beams and elastic vibration damping cushions, the floor supporting beams are fixedly connected to two sides of the upper surface of a vehicle body chassis, the elastic vibration damping cushions are arranged between the floor supporting beams and the floor, the vibration damping support structure comprises a plurality of supporting blocks which are uniformly arranged between the vehicle body chassis and the floor, the supporting blocks comprise metal layers fixed on the upper surface of the vehicle body chassis, damping layers are fixedly connected on the metal layers, the vibration damping layers are arranged between the damping layers and the floor, and the noise reduction composite material is filled in gaps between the vehicle body chassis and the floor.

Furthermore, the noise reduction composite material comprises damping patches, fireproof ceramic fibers, open rubber foam and a sound insulation felt which are arranged layer by layer.

Furthermore, the supporting blocks are arranged between the underframe of the vehicle body and the floor in an array.

Furthermore, the elastic shock pad is connected with the floor support beam and the floor in an adhesive manner.

Further, a gap is left between the support block arranged on the outermost side and the floating floor mounting structure.

The floor vibration reduction system of the rail transit vehicle adopts a floating floor installation structure, replaces the traditional mechanical bolt fixation, and greatly reduces the vibration transmission below the underframe of the vehicle body to the interior of the vehicle body; the supporting blocks which are uniformly arranged through the vibration reduction supporting structures are used for dispersing stress, the requirements of floor settlement and noise reduction are met, and meanwhile, a high-performance noise reduction composite material is filled between the vehicle underframe and the built-in floor cavity to improve the noise reduction performance of the whole system. Through adopting novel rail transit vehicle floor damping system, can effectively absorb vibration under the car and keep apart the transmission of the external noise of vehicle chassis to the guest room, for improving vehicle sound insulation damping noise reduction performance provides effective means, effectively lower vibration and noise in the guest room, improve rail vehicle's the travelling comfort of taking.

Drawings

FIG. 1 is a top view of the rail transit vehicle floor damping system of the present invention;

FIG. 2 is a partial cross-sectional view of the rail transit vehicle floor damping system of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 1;

FIG. 4 is an enlarged view of part I of FIG. 3;

FIG. 5 is an enlarged view of a portion II of FIG. 3;

FIG. 6 is an enlarged view of a portion III of FIG. 3;

FIG. 7 is a calculation of the shock absorbing support structure force;

wherein: 1. a floating floor mounting structure; 2. a vibration-damping support structure; 3. a noise reducing composite; 4. a floor; 5. a vehicle body underframe;

101. a floor support beam; 102. an elastic shock pad; 201. a metal layer; 202. a damping layer; 203 shock-absorbing layer; 301. a sound insulation felt; 302. opening rubber foam; 303 fireproof ceramic fibers; 304 damping patch.

Detailed Description

Referring to fig. 1 and 2, the rail transit vehicle floor damping system of the present invention includes a floating floor mounting structure 1, a damping support structure 2 and a noise reduction composite 3.

Referring to fig. 3 and 4, the floating floor mounting structure 1 includes a floor support beam 101 and an elastic shock pad 102, wherein the floor support beam 101 is welded on both sides of the upper surface of the vehicle body underframe 5, and the elastic shock pad 102 is adhered between the floor support beam 101 and the floor 4, on the premise of ensuring the bearing capacity and strength of the floor 4, during the running of the vehicle, the vehicle body underframe 5 and the floor 4 can generate a relative motion, and the elastic shock pad 102 absorbs the shock excitation transmitted from the lower part of the vehicle body underframe 5, similar to the way that the whole floor 4 "floats" on the vehicle body underframe 5, thereby greatly reducing the shock transmitted from the lower part of the vehicle body underframe 5 to the inside of the vehicle body and improving the shock absorption and noise reduction functions thereof.

Referring to fig. 3 and 5, the vibration damping support structure 2 includes a plurality of support blocks uniformly arranged between the vehicle body underframe 5 and the floor 4, the support blocks are in a sandwich structure of "shock pad + damping layer + metal layer", the metal layer 201 is welded on the upper surface of the vehicle body underframe 5, the damping layer 202 and the damping layer 203 are sequentially bonded on the metal layer 201, the upper surface of the damping layer 203 is bonded with the floor 4, the damping layer 203 is arranged between the floor 4 and the damping layer 202, and the vibration damping support structure also has the function of leveling the floor installation structure while absorbing the vibration transmitted from the vehicle body underframe 5 to the floor 4. Damping layer 202 adopts the polyurethane foam damping material of Regufoam series, and when the automobile body was full-load, its deflection was less than 1mm, and the natural frequency 21Hz of shock pad, and interference frequency was about 29.7Hz when the vehicle operation, can play fine shock attenuation effect. The metal layer 201 mainly plays a role of supporting and fixing.

In order to arrange the support blocks of the vibration-damping support structure 2 reasonably, according to the unique vibration damping and isolation curve of the vehicle floating floor, wherein the vehicle body interference frequency is 50Hz, and simultaneously according to the vehicle load requirement, the floor mainly bears the vertical downward positive pressure of passengers, according to the maximum overtaking working condition: 9 persons/m²70 kg/person, two 50X 100mm per person²The small square area and the noise distribution of the damping support structure 2 are calculated through simulation analysis, as shown in fig. 7, the average required bearing pressure of the damping support structure 2 is 0.083N/mm². Defining high-performance vibration-damping support structuresThe supporting blocks are arranged between the underframe of the vehicle body and the floor in an array manner, as shown in fig. 2, 12 rows are uniformly arranged along the vehicle width direction, and one row is about 300mm along the vehicle length direction, wherein a gap is reserved between the supporting block at the outermost side and the floating floor installation structure, so that mutual interference is prevented. The average pressure of the shock absorption support at this time is 0.083N/mm²Under the pressure, the compression amount of the shock pad is about 0.7mm, the requirement of floating floor settlement is not more than 1mm, and meanwhile, the natural frequency of the shock absorption support is about 25Hz and is 50Hz lower than the vehicle body interference frequency.

Referring to fig. 3 and 6, the noise reduction composite material 3 comprises damping patches 304, fireproof ceramic fibers 303, open rubber foam 302 and sound insulation felt 301 which are bonded together layer by layer, and the damping patches, the fireproof ceramic fibers 303, the open rubber foam 302 and the sound insulation felt 301 are filled in a supporting block gap between the vehicle body underframe 5 and the floor 4, so that the noise reduction performance of the whole structure is further improved, and meanwhile, the fireproof performance of the structure is improved, so that the structure can meet the relevant requirements of related international fireproof standards such as EN 45545 and the like. On the premise of not sacrificing the fireproof and heat-insulating performance of the whole vehicle, a high-performance noise-reducing composite material system is formed.

Claims

1. A rail transit vehicle floor vibration damping system is characterized by comprising a floating floor mounting structure (1), a vibration damping supporting structure (2) and a noise reduction composite material (3), wherein the floating floor mounting structure (1) comprises a floor supporting beam (101) and an elastic vibration damping pad (102), the floor supporting beam (101) is fixedly connected to two sides of the upper surface of a vehicle body chassis (5), the elastic vibration damping pad (102) is arranged between the floor supporting beam (101) and a floor (4), the vibration damping supporting structure (2) comprises a plurality of supporting blocks which are uniformly arranged between the vehicle body chassis (5) and the floor (4), each supporting block comprises a metal layer (201) fixed on the upper surface of the vehicle body chassis, a damping layer (202) is fixedly connected on the metal layer (201), a vibration damping layer (203) is arranged between the damping layer (202) and the floor (4), and the noise reduction composite material, is filled in the supporting block gap between the vehicle body underframe (5) and the floor (4).

2. A rail transit vehicle floor damping system according to claim 1, characterized in that the noise reducing composite (3) comprises damping patches (304), fire-proof ceramic fibres (303), open rubber foam (302) and sound insulation felt (301) arranged layer by layer.

3. The rail transit vehicle floor damping system according to claim 1, characterized in that the support blocks are arranged in an array between the vehicle body underframe (5) and the floor (4).

4. A rail vehicle floor damping system according to claim 1, characterized in that the resilient damping pads (102) are adhesively connected to the floor support beam (101) and the floor (4).

5. A rail vehicle floor damping system according to claim 1, characterized in that the outermost support blocks are spaced from the floating floor mounting structure (1).