Rail vibration absorber

Abstract

The invention discloses a rail vibration absorber which comprises an elastic element, a mass block and at least one connection framework. The connection framework is the same as the surface of a steel rail non-working surface connection part in shape. The connection framework comprises at least one vibration absorption cavity. At least a part of the mass block is arranged in the vibration absorption cavity of the connection framework. The elastic element is arranged between the mass block and the cavity wall of the vibration absorption cavity. The rail vibration absorber has the advantages that due to the fact that a mass-spring system composed of the mass block and the elastic element is arranged in the connection framework, the mass block and the elastic element are effectively protected by the connection framework; the mass block is only connected with the elastic element in series so that the material selection range of the elastic element can be wide; the space occupied by the elastic element is small, so that a larger and heavier mass block is arranged under the same condition, and the quality tuning vibration reducing effect is achieved; the rail vibration absorber is simple in structure, stable in performance, good in weather resistance, wide in application frequency domain, long in service life, superior in cost-performance ratio, beneficial to delaying abrasion to a steel rail and prolonging the service life of the steel rail, and very wide in market application prospect.

Description

technical field [0001] The invention belongs to the field of vibration and noise control of rail traffic, and in particular relates to a vibration damping device arranged on a non-working surface of a rail and used to reduce the vibration and noise generated by the rail during rail vehicle operation. Background technique [0002] In recent years, the rapid development of my country's rail transit has provided people with a fast and safe way of travel. At the same time, the vibration and noise problems generated by it have also seriously affected the quality of life of surrounding residents, endangered the safety of surrounding buildings, and made the track itself stable. Safety, safety and service life are also affected. [0003] Research shows that among the railway noise generated during train operation, wheel-rail noise accounts for a high proportion, and the contribution of medium and high-frequency noise radiated by rail vibration to the final total noise is particularly...

AI Technical Summary

Problems solved by technology

However, it has been found in engineering applications that elastic elements such as rubber are generally used in existing technical solutions, and then built-in mass blocks in the elastic elements, and rail transit is widely distributed and the external environmental conditions vary widely, long-term direct exposure After being exposed to the external environment, the physical properties of rubber and other elastic materials are easily affected by the external environment, and are also easily scratched and damaged by external objects, which will adversely affect the vibration and noise reduction performance and service life of the tuned shock absorber.

In addition, due to the small constraint force formed by the rubber-like elastic element on the mass block, the tensile and compressive components generated by the mass block on the elastic element during the movement inside the elastic element are large, and the shear component is small, so effective shear energy dissipation cannot be achieved. , the damping effect is also greatly limited

In addition, limited by the structure and materials, the applicable frequency range of this type of tuned damper for rails is small. For example, for low frequency control, the elastomer needs to have high elasticity, and the material is soft and easy to be torn; for high frequency Control requires the elastic body to have greater hardness, its elasticity is poor, and the vibration damping effect is not good

Furthermore, this type of rail tuned damper generally has the following disadvantages: (1) the mass block is embedded in the elastic material, and it is difficult to achieve accurate mass tuned damping in two directions at the same time; (2) the tuned damper It is still a semi-finished product when it leaves the factory, and has not been assembled with the rail, so the working frequency cannot be directly measured or debugged; (3) Once the material cracks, cracks will form inside, and the stiffness of the elastic element and the working frequency of the tuned shock absorber will change; ( 4) Elastic elements, damping materials, and adhesive materials are integrated together, and it is impossible to optimize all parameters; (5) Once the elastic material cracks, the TMD mass block will fall off, which will bring safety hazards to the train operation

[0004] In summary, it can be seen that the existing tuned dampers have defects such as limited vibration and noise reduction effects, unstable performance, narrow applicable frequency range, and short service life.

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