Improved steel rail vibration absorption system and method for improving vibration absorption performance
A system performance, rail technology, applied in the field of rail vibration and rail transit, can solve the problems of inability to spread, unsatisfactory vibration reduction effect, etc., and achieve good vibration absorption effect.
Active Publication Date: 2020-03-24
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology
However, the damping effect of the traditional rail dynamic resonance unit is not ideal at low frequencies, so some scholars based on the periodic structure vibration band gap theory (the elastic wave will form an elastic wave band gap when it propagates in the periodic structure, and the wave in the band gap decays rapidly so that it cannot be propagated), since the track structure itself can be regarded as a periodic structure along the longitudinal direction of the rail, which itself has a band gap characteristic, by periodically adding a mass-spring resonance unit on the rail, that is, a dynamic resonance unit, for Adjust the bandgap characteristics of the rail to widen the width of the bandgap to achieve wider-frequency vibration reduction, but this method can only achieve wider-frequency vibration reduction by adjusting the width of the bandgap, and the vibration reduction effect in actual engineering is not ideal. Therefore, it is necessary to propose a better method for the rail dynamic resonance unit
Method used
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Embodiment 1
[0058] (1) Measure the fastener spacing with a tape measure, and the measured fastener spacing is 0.625m;
[0059] (2) Find from Table 1 that the best detuning degree corresponding to the fastener spacing of 0.625m is 20%, and the best detuning range is -0.135m~0.135m calculated by formula (1.1);
[0060] (3) The length of the rail section where the dynamic resonance unit needs to be installed is 6.25m, that is, 10 dynamic resonance units need to be installed, and a set of detuning quantities are randomly selected from the best detuning range: -0.104m, -0.1m, -0.0995 m, -0.0998m, -0.102m, 0.0964m, 0.097m, 0.0991m, 0.105m, 0.11m, the rail mid-span position between adjacent fasteners is the standard reference position.
[0061] (4) According to the selected detuning amount, move left and right to determine the installation position of the resonance unit, and finally perform one-to-one corresponding installation.
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The invention relates to an improved steel rail vibration absorption system and a method for improving vibration absorption performance. The system comprises a steel rail and a plurality of fastenersarranged on the steel rail, the improved steel rail vibration absorption system is characterized in that resonance units are arranged on the steel rail between the fasteners, and the distance betweenevery two adjacent resonance units is detuned. According to the vibration absorption system and method, by introducing interval detuning, the vibration absorption effect of the arrangement mode of thesteel rail dynamic resonance units with the resonance units arranged in a random detuning mode is better than that of a traditional mode of periodically arranging the dynamic resonance units.
Description
Technical field [0001] The invention belongs to the field of rail transit technology, especially the field of rail vibration, and specifically relates to an improved rail vibration absorption system and a method for improving vibration absorption performance. Background technique [0002] The vibration generated by the wheel-rail interaction has always been one of the urgent problems in the field of track engineering. The propagation of track vibration mainly has two directions: one is that the vibration energy of lower frequency propagates vertically from fasteners, track beds, subgrades or bridges, piers, pile foundations or tunnel walls to the environmental soil, thereby affecting Surrounding buildings, plant equipment and other facilities; second, due to the limited damping of the steel rail itself, higher frequency vibration energy is transmitted longitudinally along the rail. On the one hand, these vibration energy will cause damage to the rail, such as corrugation, and on...
Claims
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IPC IPC(8): E01B19/00G06F30/23G06F30/17
CPCE01B19/003
Inventor 冯青松杨舟张运来郭文杰廖宝亮
Owner EAST CHINA JIAOTONG UNIVERSITY
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