STUDY ON CURVED TRACK DYNAMIC RESPONSE UNDER A FIXED HARMONIC LOAD

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (20) : 233-239.

Du Lin-lin1, Liu Wei-ning1, Liu Wei-feng1, Ma Long-xiang2

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Abstract

Modelling the dynamic behavior of a curved railway track subjected to fixed harmonic loads is important to understand its dynamic characteristics. The discretely supported curved Euler Beam is used to simulate dynamic response of curved track based on periodic structure. Mathematical modes of track and generalized wavenumber are introduced, and dynamic response of bending and torsion of curved track in frequency domain is expressed by series superposition of the mathematical modes. Dynamic response of curved track subjected to a fixed harmonic load is obtained, and some conclusions are obtained. The natural vibration frequency of curved beam is greatly affected by vertical stiffness, vertical damping coefficient and spacing of fasteners. The first-order natural frequency of track increased by increasing the vertical stiffness of fastener, but decreased slightly by increasing the vertical damping of fastener. The first-order natural frequency of track increasing as the fastener spacing is decreased. Fastener spacing has a significant influence on response of curved track. The bigger the fastener spacing is, the greater the amplitude of first order pin-pin resonance in mid-span and the bigger the amplitude of first order pin-pin anti-resonance in fastener support is. Radius has little effect on vertical displacement frequency response of curved track in metro.

Key words

curved track / coupling of bending and torsion / modal superposition method / periodical structure / frequency response function.

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Du Lin-lin1, Liu Wei-ning1, Liu Wei-feng1, Ma Long-xiang2. STUDY ON CURVED TRACK DYNAMIC RESPONSE UNDER A FIXED HARMONIC LOAD[J]. Journal of Vibration and Shock, 2017, 36(20): 233-239

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