A dynamic vibration absorber for track vibration reduction and its application

Abstract

The present invention belongs to the field of vibration reduction and noise reduction, and specifically discloses a dynamic vibration absorber for rail vibration reduction and its application. The dynamic vibration absorber includes a coil spring, a mass block, a base plate and a damper, wherein: the upper end of the coil spring is connected to the mass block, and the lower end thereof is connected to the base plate, and the damper is arranged between the mass block and the base plate, and is used to adjust the resonant frequency of the dynamic vibration absorber. When working, the inertia force generated by the relative movement between the mass block and the rail is used to generate a reaction control force on the rail, so that the vibration response of the rail is attenuated, thereby achieving the effect of vibration reduction and noise reduction. The present invention can generate a reaction control force on the rail by using the inertia force generated by the relative movement between the mass block and the rail when the rail is subjected to dynamic action and vibrates violently, and exert an energy-consuming effect through the damper, and through the spring-damping tuning effect, the vibration response of the rail is significantly attenuated, so as to achieve the effect of vibration reduction and noise reduction.

Description

Technical Field

[0001] The present invention belongs to the field of vibration reduction and noise reduction, and more specifically, relates to a dynamic vibration absorber for track vibration reduction and application thereof. Background Art

[0002] With the development of urbanization in my country and the increase in the density of rail transit, more and more lines are crossing densely populated areas in cities. Since the development of railway transportation, the vibration and noise pollution caused by the continuous increase in train speed has become increasingly prominent. At the same time, ballastless track has been widely used in my country's newly built high-speed railways due to its advantages such as high smoothness, high stability and low maintenance. However, due to the high rigidity of ballastless track, its vibration absorption and noise reduction effects are not good. The huge vibration and noise brought by high-speed train operation are difficult to attenuate, which not only greatly reduces the riding comfort of passengers in the car, but also causes certain noise pollution to the environment along the line and the interior of the car, and may even directly affect the planning and construction of new railways.

[0003] The traditional method of vibration and noise reduction is to place rubber pads under the sleepers, but this method has poor vibration and noise reduction effects, and has the problems of rubber aging, short service life, and inconvenient replacement. The constrained damping noise reduction technology has poor adaptability to the track environment, and the vibration reduction effect has high requirements on the laying position. With the continuous development of science and technology, the speed of high-speed rail is getting faster and faster, and the vibration and noise it generates are also getting greater and greater. Rubber pads and constrained damping can no longer meet the current vibration reduction requirements. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a dynamic vibration absorber for track vibration reduction and its application, wherein the dynamic vibration absorber is capable of consuming the energy of vibration through spring-damper tuning by providing a mass block connected to a coil spring and a damper provided under the mass block, thereby achieving vibration reduction and noise reduction effects, and is therefore particularly suitable for applications in track vibration reduction.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present invention, a dynamic vibration absorber for track vibration reduction is proposed, which includes a coil spring, a mass block, a base plate and a damper, wherein: the upper end of the coil spring is connected to the mass block, and the lower end thereof is connected to the base plate, and the damper is arranged between the mass block and the base plate, and is used to adjust the resonant frequency of the dynamic vibration absorber. When working, the inertial force generated by the relative movement between the mass block and the rail is used to generate a reaction control force on the rail, thereby attenuating the vibration response of the rail, thereby achieving the effect of vibration reduction and noise reduction.

[0006] As a further preferred embodiment, the damper is a cantilever beam damper, which includes a fixed block and a cantilever beam, the fixed block is connected to the base plate, one end of the cantilever beam is connected to the fixed block, and the other end of the cantilever beam is connected to the mass block, and the resonant frequency of the dynamic vibration absorber is adjusted by changing the length of the cantilever beam during operation.

[0007] As a further preference, the mass ratio of the mass block is 0.005-0.05.

[0008] According to another aspect of the present invention, an application of the above-mentioned dynamic vibration absorber for track vibration reduction in railways is proposed.

[0009] As a further preference, the base plate of the dynamic vibration absorber is connected to the elastic body and the damping body attached to the rail.

[0010] As a further preference, the dynamic vibration absorber is arranged on one side or both sides of the rail.

[0011] As a further preference, the installation spacing of the dynamic vibration absorbers is 40 cm to 120 cm.

[0012] In general, the above technical solution conceived by the present invention has the following technical advantages compared with the prior art:

[0013] 1. The dynamic vibration absorber for rail vibration reduction provided by the present invention can use the inertial force generated by the relative movement between the mass block and the rail to generate a reaction control force on the rail when the rail is subjected to dynamic action and vibrates violently, and play an energy-consuming role through the damper. Through the spring-damping tuning effect, the vibration response of the rail is significantly attenuated to achieve vibration reduction and noise reduction, thereby reducing the energy transmitted between the wheel and the rail, preventing the generation of vibration and noise, thereby prolonging the service life of the wheel and the rail, reducing the cost of railway use, and reducing noise pollution;

[0014] 2. In particular, the present invention adopts a cantilever beam damper, and the resonant frequency of the dynamic vibration absorber can be changed by adjusting the length of the cantilever beam, thereby meeting the vibration reduction needs of different track structures and different load conditions;

[0015] 3. In addition, the present invention can adjust its own vibration frequency and amplitude by optimizing the mass ratio of the mass block, and control the motion trajectory of the mass block within a certain range;

[0016] 4. At the same time, the dynamic vibration absorber for track vibration reduction provided by the present invention has the advantages of easy installation and replacement, strong operability and adjustability during application, and no need to consider boundary issues, and will not interfere with line communication, rail flaw detection and train travel, and has the conditions for large-scale promotion in high-speed railway lines;

[0017] 5. During the application process, by optimizing the installation spacing of the dynamic vibration absorber, it can be flexibly adjusted according to the actual load conditions and vibration reduction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of installing the dynamic vibration absorber for track vibration reduction provided by the present invention on both sides of the track;

[0019] Figure 2 It is a schematic diagram of installing the dynamic vibration absorber for track vibration reduction provided by the present invention on a single side of the track;

[0020] Figure 3 It is a side view of the dynamic vibration absorber for track vibration reduction provided by the present invention installed on the track;

[0021] Figure 4 A schematic structural diagram of a dynamic vibration absorber for track vibration reduction constructed according to a preferred embodiment of the present invention;

[0022] Figure 5 yes Figure 4 Enlarged view of the circled portion.

[0023] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0024] 1-rail, 2-elastic body, 3-mass block, 4-coil spring, 5-base plate, 6-damping body, 7-fixing block, 8-screw, 9-cantilever beam, 10-damper. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figures 1 to 5 As shown, an embodiment of the present invention provides a dynamic vibration absorber for track vibration reduction, which includes a coil spring 4, a mass block 3, a base plate 5 and a damper 10, wherein: the upper end of the coil spring 4 is connected to the mass block 3, and the lower end thereof is connected to the base plate 5, and is located at the four corners of the mass block 3 and the base plate 5; the damper 10 is arranged between the mass block 3 and the base plate 5, and is used to adjust the resonant frequency of the dynamic vibration absorber. When working, the inertial force generated by the relative movement between the mass block 3 and the rail 1 is used to generate a reaction control force on the rail 1, thereby attenuating the vibration response of the rail 1, thereby achieving the effect of vibration reduction and noise reduction.

[0027] Furthermore, the damper 10 is a cantilever beam damper, which includes a fixed block 7 and a cantilever beam 9. The fixed block 7 is connected to the base plate 5. One end of the cantilever beam 9 is connected to the fixed block 7, and the other end is connected to the mass block 3 through a screw 8. The resonant frequency of the dynamic vibration absorber can be adjusted by changing the length of the cantilever beam 9. The cross-section of the cantilever beam 9 is circular or rectangular, which can control vibrations in multiple directions at the same time. It has the advantage of being adjustable and can meet the vibration reduction needs of different track structures.

[0028] The stiffness of the dynamic vibration absorber used for track vibration reduction is mainly borne by two parts. The supporting stiffness of the coil spring 5 is a fixed stiffness, which is used to balance the weight of the mass block 3, and the bending stiffness of the cantilever beam 9 is an adjustable stiffness, which is used to adjust the resonant frequency of the damper 10.

[0029] Furthermore, the mass block 3 can be a concrete block, a lead-filled steel box, or a steel ring filled with lead blocks surrounding the outside of the structure. The size of the mass block 3 is determined by the mass ratio. The mass ratio of the mass block 3 is 0.005-0.05, which is used to adjust its own vibration frequency and amplitude to make it consistent with the frequency of track vibration to achieve a vibration reduction effect. At the same time, the movement trajectory of the mass block 3 can be controlled within a certain range to avoid excessive displacement and collision with the rail 1.

[0030] like Figures 1 to 3 As shown, according to another aspect of the present invention, an application of the above-mentioned dynamic vibration absorber for track vibration reduction on railways is proposed, an elastomer 2 is attached to the rail 1, a damper 6 is attached to the elastomer 2, and the base plate 5 of the dynamic vibration absorber is connected and fixed to the damper 6. The shape of the damper 6 is fitted and filled according to different cross-sections of the rail 1 to ensure that the base plate 5 of the dynamic vibration absorber is located on a whole plane. The elastomer 2 uses polyurethane as the main material, and one or more materials such as rubber particles, rubber powder, wood chips, mineral materials, etc. are selected as filling materials. The damper 6 is a plastic polymer flexible material, and the elastomer 2 and the damper 6 are both insulating materials.

[0031] The rail model used in this embodiment is U71MN 60kg / m, and the structure and arrangement method of the dynamic vibration absorber energy dissipation device are also applicable to other types of rails. The dynamic vibration absorber can be set on one side or both sides of the rail 1, and ensure that there is enough space between the dynamic vibration absorber and the top surface and the waist of the rail 1. When the dynamic vibration absorber is self-vibrating and dissipating energy, the distance that the outermost edge of the mass block 3 is raised, lowered, or moves inward during self-vibration does not exceed the distance from the mass block 3 to the top surface or waist of the rail 1, that is, the mass block 3 will not touch the rail 1 during operation.

[0032] Furthermore, the dynamic vibration absorbers are arranged along the train travel direction of the rail 1, and the number and spacing can be adjusted accordingly according to the vibration reduction and energy consumption requirements. The installation spacing of the dynamic vibration absorbers is preferably 40cm to 120cm, so that they can be flexibly adjusted according to the actual load conditions and vibration reduction requirements, avoiding poor vibration reduction effect due to excessive spacing, and avoiding the problem of low vibration reduction accuracy due to too small spacing.

[0033] To sum up, the technical principle of the above structure is that when the rail 1 is subjected to dynamic force and vibrates violently, the vibration continues to be transmitted after being initially consumed by the elastic body 2 and the damping body 6, and the mass block 3 in the dynamic vibration absorber moves accordingly, and the inertial force generated by the relative movement between the mass block 3 and the rail 1 is used to exert a reaction control force on the rail 1, and its damper 10 also plays an energy-consuming role, thereby significantly attenuating the vibration response of the rail 1 to achieve the effect of reducing vibration and noise.

[0034] It will be easily understood by those skilled in the art that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dynamic vibration absorber for track vibration reduction, characterized in that: The dynamic vibration absorber comprises a coil spring (4), a mass block (3), a base plate (5) and a damper (10), wherein: the upper end of the coil spring (4) is connected to the mass block (3), and the lower end thereof is connected to the base plate (5); the damper (10) is arranged between the mass block (3) and the base plate (5) and is used to adjust the resonance frequency of the dynamic vibration absorber. When in operation, the inertial force generated by the relative movement between the mass block (3) and the rail (1) is used to generate a reaction control force on the rail (1), thereby attenuating the vibration response of the rail (1), thereby achieving a vibration reduction and noise reduction effect; The damper (10) is a cantilever beam damper, comprising a fixed block (7) and a cantilever beam (9), wherein the cross section of the cantilever beam (9) is circular or rectangular.

2. The dynamic vibration absorber for track vibration reduction according to claim 1, characterized in that: The fixing block (7) is connected to the base plate (5), one end of the cantilever beam (9) is connected to the fixing block (7), and the other end thereof is connected to the mass block (3), and the resonant frequency of the dynamic vibration absorber is adjusted by changing the length of the cantilever beam (9) during operation.

3. The dynamic vibration absorber for track vibration reduction according to claim 1 or 2, characterized in that: The mass ratio of the mass block (3) is 0.005-0.

05.

4. Use of the dynamic vibration absorber for track vibration reduction as claimed in any one of claims 1 to 3 on railways.

5. Application of the dynamic vibration absorber for track vibration reduction as claimed in claim 4 on railways, characterized in that: The base plate (5) of the dynamic vibration absorber is connected to an elastic body (2) and a damping body (6) attached to the rail (1).

6. Application of the dynamic vibration absorber for track vibration reduction as claimed in claim 4 on railways, characterized in that: The dynamic vibration absorber is arranged on one side or both sides of the rail (1).

7. The use of the dynamic vibration absorber for track vibration reduction according to any one of claims 4 to 6 on railways, characterized in that: The installation spacing of the dynamic vibration absorbers is 40 cm to 120 cm.

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