Abstract:Abstract:Research purposes: The frequency distributions of the vibration excited by track alignment of high-speed railway are mainly below 1 Hz. In order to distinguish the vibrations excited by track alignment from those excited track irregularity and so on, evaluate the comfort and determine the parameter of track alignment, the evaluation of the motion sickness and ride comfort caused by track vertical grade sections is performed with the frequency distributions 0.02~4 Hz and 0.5~80 Hz, respectively, based on the comfort assessment method proposed by ISO 2631.
Research conclusions:(1) The length of the intermediate grade section between vertical curves has a great impact on the overlap of the vibration excited by the beginning and ending of vertical curves, and the vibrations can be attenuated remarkably and the vibration overlap can be avoided when the length of the intermediate grade section is longer than 200 m. (2) The vibration frequencies aroused by vertical curves are related to the running speed and the length of grade sections, and may be in the ranges of the frequency bands of motion sickness. (3) The motion sickness and ride comfort caused by track vertical alignment are mainly influenced by the algebraic difference between adjacent gradients of adjacent grade sections and the length of intermediate grade sections, and the minimum length of the intermediate grade section are proposed taking the vibration overlap and motion sickness into account. (4) The comfort assessment method proposed in this paper based on the method for low frequency vibration proposed by ISO 2631 can be applied to the analysis of the track alignment of high-speed railway.
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