Vibration Characteristics and Stability of the Longitudinal Coupled Track under Temperature Force

doi:10.3901/JME.2018.06.086

Abstract

Abstract: Taking the CRTS Ⅱ slab track as an example, the finite element model of vertical vibration is established, the vibration frequency of the longitudinal coupled track with initial upwarp under longitudinal temperature force is solved by finite element method, and the vertical stability of the track structure under the longitudinal temperature force is studied based on the dynamic criteria of structural stability analysis. The effects of temperature gradient, dummy joint and foundation stiffness on the vibration characteristics of track plate are analyzed. The results show that the longitudinal temperature force will lead to the decrease of the natural frequency of the track structure; When the temperature is close to the critical temperature of instability, the natural frequency approaches to 0 Hz; The temperature gradient will reduce the natural frequency of the track structure, in which positive temperature gradient is more obvious than negative temperature gradient. Dummy joint will reduce the natural frequency of the track plate, but the impact is small. Temperature gradients, dummy joint and base stiffness have little effect on the critical temperature.

Key words: ballastless track, dynamic method, stability, temperature force, vibration characteristics

CLC Number:

U213

LIU Xiaokai, XIAO Jieling, ZHAO Chunguang, QUAN Yi, LIU Xueyi. Vibration Characteristics and Stability of the Longitudinal Coupled Track under Temperature Force[J]. Journal of Mechanical Engineering, 2018, 54(6): 86-92.

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