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System and method for achieving low-frequency vibration reduction through fastener rigidity detuning

A technology of fasteners and stiffness, which is applied in the field of low-frequency vibration reduction systems, can solve problems such as ineffective effects and vibration wave transmission, and achieve cost-saving and easy-to-operate effects

Active Publication Date: 2020-09-25
GUANGZHOU METRO DESIGN & RES INST
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] Studies have proved that there is a bandgap characteristic in the periodic ballastless track structure. The vibration wave in the bandgap frequency range cannot be transmitted along the longitudinal direction of the rail, and most of the vibration energy is transmitted to the lower foundation, and the ballastless track structure vibration zone The gap frequency is mainly in the range of 0-200Hz, which will cause low-frequency environmental vibration problems, and the current control methods for low-frequency vibration are not effective, so it is necessary to find a method that can effectively control low-frequency vibration in the band gap

Method used

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  • System and method for achieving low-frequency vibration reduction through fastener rigidity detuning
  • System and method for achieving low-frequency vibration reduction through fastener rigidity detuning
  • System and method for achieving low-frequency vibration reduction through fastener rigidity detuning

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Embodiment 1

[0071] The method of Embodiment 1 of the present application is illustrated below in conjunction with accompanying drawings, comprising the following steps:

[0072] (1) Determine that the vibration frequency to be controlled is 115-120Hz, and combine the relationship between the frequency of the defect state and the stiffness mismatch of the fastener to determine that the stiffness mismatch of the fastener is about 91.2%-62.4%, that is, the target fastener stiffness is loose The range of release degree is 91.2%-62.4%, which means that the stiffness of the fastener after loosening is 8.8%-37.6% of the stiffness of the standard fastener, and the vertical stiffness of the track structure fastener is about 25kN / mm, and then converted to the corresponding fastener at this time The stiffness range is 2.2kN / mm-9.4kN / mm;

[0073] (2) According to the determined stiffness range of the fastener, directly replace the fastener with a small stiffness of 9.4kN / mm at a certain fastener posi...

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Abstract

The invention relates to a system and a method for realizing low-frequency vibration reduction by utilizing fastener rigidity detuning. The system comprises a steel rail and a plurality of fasteners arranged on the steel rail. The system and the method are characterized in that the rigidity of the fasteners meets the detuning requirement. By the adoption of the scheme, the operation is easy, and the rigidity of the fastener is detuned only by manually loosening the fastener or replacing a fastener with lower rigidity; in addition, the damping layer and other materials capable of dissipating energy only need to be installed on the steel rail at the position where the rigidity of the fastener is mistuned instead of the full-section of the rail structure, so that the cost is saved, and the effect of controlling low-frequency vibration is effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and in particular relates to a system and method for realizing low-frequency vibration reduction by using fastener stiffness detuning. Background technique [0002] As the speed and operating density of modern railways have increased significantly, more and more railway lines are designed to be particularly complex, and inevitably pass through residential areas and urban areas. When high-speed railways pass through residential areas and urban areas, the vibration of the track structure will Due to the serious noise pollution caused by the radiation of sound waves, it has adversely affected the work and life health of residents along the line, the normal use of adjacent buildings and precision instruments, and has become the most representative environmental problem. Therefore, it is particularly important to control the environmental vibration caused by train operation. [0003] Studies hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B19/00
CPCE01B19/003
Inventor 刘文武史海欧罗信伟贺利工吴嘉冯青松王仲林杨舟刘堂辉吴梦孙菁孙元广姬霖袁江潘鹏刘庆杰尹华拓涂勤明欧熙韦安祺
Owner GUANGZHOU METRO DESIGN & RES INST
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