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Monday, July 8 • 16:50 - 17:10
STUDY ON EFFECT OF CURVED TRACK PARAMETERS ON TRACK DECAY RATES

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Based on an analytical model of the curved track, the effect on decay rates of some parameters of curved track are analyzed, including the stiffness, damping and spacing of fasteners, and the radius of curvature. The track is modelled as a curved Timoshenko beam, and the dynamic response of curved track subjected to a harmonic load can be obtained. The superposition of track modes and the periodic structure theory are applied to motion equations of curved track so that the dynamic response of track can be calculated efficiently in a reference cell. The track decay rates can be calculated based on the velocity mobility of the rail obtained through the model. Some conclusions are drawn as follows. The fastener stiffness affects the decay rates below 2000 Hz to some degree, and the decay rates become larger as the stiffness rises. The fastener damping has a significant influence on the decay rates above 100 Hz, which are enhanced greatly with increasing damping. Compared to other fastener spacing, the decay rates for 0.6 m fastener spacing are larger in most of the frequencies. The radius of curved track does not have effect on the decay rates for the tracks of railway and urban rail transit systems.

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avatar for Wim van Keulen

Wim van Keulen

owner, VANKEULEN advies
expert in low-noise pavements: - psycho-acoustical labelling,- contracts,- courses,- product development,- questionnaires,- measurements.

Authors

Monday July 8, 2019 16:50 - 17:10 EDT
Outremont 5
  T15 Road & rlway noise & vibr., RS01 Railway noise & vibr