Vibration impact and reduction measures of high-speed trains meeting on precision instruments in adjacent buildings

Abstract

With the vigorous construction of intercity railways, the environmental vibrations along the railways, especially in buildings with precision instruments (PI), have been deteriorating, and the internal instruments are affected by repeated vibrations. The train-induced vibrations will be more severe when two trains meet at a high speed. In this study, numerical simulation analysis of PI in adjacent buildings was carried out. A coupling model of high-speed trains meeting was developed, and a method for predicting vibration superposition was proposed. The existing vibration data were collected and used for model verification. Based on this, the vibrations of PI were evaluated, and corresponding measures were proposed. The prediction results show that the dominant frequency of the existing vibrations is 10–20 Hz, and there is a risk of excessive vibrations in this frequency range. PI can be affected by high-speed trains meeting, resulting in abnormal operation. The high-frequency train-induced vibrations (40–80 Hz) are effectively alleviated by the damping pad. After the superposition of train-induced vibrations and existing vibrations, the vibrations on higher floors are mainly in the 10–20 Hz range, which requires attention and implementation of reduction measures for PI.

Keywords

intercity railway / trains meeting / vibration prediction / precision instruments / damping track

References

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