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钢轨轧制不平顺对车岔耦合系统垂向动力特性的影响

ISSN号：1672-7207
期刊名称：《中南大学学报：自然科学版》
时间：0
分类：U213.6[交通运输工程—道路与铁道工程]
作者机构：西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031
相关基金：国家自然科学基金资助项目（51378439,51425804,U1334203,U1234201）;西南交通大学优秀博士学位论文资助项目（2015）

关键词：车辆, 道岔, 轧制不平顺, 垂向轮轨力, 减载率, vehicle, turnout, rail straightening irregularity, vertical wheel-rail force, reduction rate of wheel load

中文摘要：

为分析某18号高速道岔轨道不平顺的产生原因,使用快速傅里叶变换的方法分析其频率分布,道岔转辙器区与辙叉区的钢轨不平顺是钢轨轧制过程中控制精度不足造成的,其主频波长为0.8 m的倍数。基于车辆-道岔耦合系统动力学理论,研究钢轨轧制不平顺对道岔区垂向轮轨力和轮重减载率的影响,并分析不同车辆通过速度条件下最大轮重减载率的变化规律。研究结果表明：车辆以350 km/h的速度通过道岔时,垂向轮轨力变化较为剧烈,其一阶主频为50.51 Hz,与全线轨道不平顺的一阶主频51.27 Hz基本相同,辙叉区最大轮重减载率超过0.8的限值,且持续时间较长,存在脱轨的可能;道岔区钢轨存在轧制不平顺时,车辆速度对最大轮重减载率影响较为显著,为保证轮重减载率不超过0.8的限值,车辆通过高速道岔时理论上应限速160 km/h,当不存在钢轨轧制不平顺时,车辆速度对最大轮重减载率的影响较小。

英文摘要：

In order to analyze the cause of track irregularity in a No.18 high speed turnout, the frequency distribution was calculated by the method of Fast Fourier Transform, and the track irregularities of switch and frog section were caused by the accuracy of rail straightening operation, and the wavelength of dominate frequency was a multiple of 0.8 m. A model was established based on the vehicle-turnout coupling system dynamic theory which was used to analyze the effect of straightening irregularity on vertical wheel-rail force and reduction rate of wheel load, in addition, the effect of vehicle velocity on the maximum reduction rate of wheel load is analyzed by the model. The results indicate that the vertical wheel-rail force has a drastic change when the vehicle passes the high-speed turnout at a velocity of 350 km/h. The first dominate frequency of vertical wheel-rail force is 50.51 Hz and the first dominate frequency of the track irregularity is 51.27 Hz, and the former is approximately equal to the later. The maximum reduction rate of wheel load at frog is above standard of 0.8, and it is likely to derail when the time of duration is longer. The maximum reduction rate of wheel load is significantly affected by the increase of vehicle velocity when there is rail irregularity in the turnout. The vehicle velocity should be limited to 160 km/h to ensure the reduction rate of wheel load at the limit value of 0.8 theoretically, the vehicle velocity has a little impact on the maximum reduction rate of wheel load when the track has no straightening irregularity.

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