地铁车辆以磨耗车轮通过钢弹簧浮置板轨道时的较好平稳性速度
张劲明于蒻丹马贺张军王稳
Preferable Stability Speed of Metro Vehicles Passing Steel Spring Floating Slab Tracks with Worn Wheels
ZHANG JinmingYU RuodanMA HeZHANG JunWANG Wen
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作者信息:北京建筑大学城市轨道交通车辆服役性能保障北京市重点实验室， 100040， 北京
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Affiliation:Beijing University of Civil Engineering and Architecture, Key Laboratory for Service Performance of Urban Rail Transit Vehicles, 100040, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.01.020
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中图分类号/CLCN:U270.1+1
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栏目/Col:研究报告
摘要:
［目的］为使地铁乘客获得较好的乘车体验，探究轨道线路铺设浮置板时车体平稳性较好的通过速度区间。［方法］利用仿真软件建立了地铁车辆浮置板轨道路基的动力学模型，分析了标准车轮及磨耗车轮通过地铁有无钢弹簧浮置板轨道时的车体振动状况。对比了不同速度条件下，增设浮置板前后车体垂向平稳性指标时域及频域的变化；对比了车体在浮置板轨道系统下，车体以磨耗车轮与标准车轮通过时，车体的垂向振动加速度等参数时域及频域的变化规律。［结果及结论］不同速度时，浮置板会使列车的平稳性指标增大，相比无浮置板时平均增长了5.8%；横向平稳性指标在速度低于60 km/h时，其对平稳性指标有减小作用。浮置板系统中，磨耗车轮的存在会加剧车体垂向振动，这种现象在列车高速行驶时表现更突出。地铁车辆通过轨道时的垂向振动加速度频率主要集中在低频区段的0~10 Hz，横向振动加速度频率区段主要集中在0~30 Hz。地铁车辆通过存在浮置板路段且速度在48~60 km/h区间时，磨耗车轮的车体垂向平稳性指标在1.8左右，横向平稳性指标在1.1左右，数值均较低，即车体振动及横向运动较小，平稳性较好。
Abstracts:
［Objective］ To enhance metro passenger riding experience, the speed range at which the carbody exhibits optimal stability while passing through tracks laid with floating slabs is explored. ［Method］ Using simulation software, a dynamics model of metro vehicle-floating slab track-subgrade is established to analyze the carbody vibration conditions when standard and worn wheels pass through tracks with or without steel spring floating slabs. Comparative analysis is conducted on the changes in carbody vertical stability index in time and frequency domains under different speed conditions, both before and after the installation of floating slabs. Additionally, under the floating slab track system，the change law of time and frequency domains of parameters such as carbody vertical vibration acceleration is compared between the worn and standard wheels passing through the floating slab track system. ［Result & Conclusion］ The presence of floating slabs at different speeds increases train stability index, showing an average increase of 5.8% compared to scenarios without floating slabs. The lateral stability index has a reducing effect on stability index when the speed is below 60 km/h. In the floating slab system, the presence of worn wheels exacerbates carbody vertical vibration, particularly noticeable when trains are running at high-speed. The vertical acceleration frequencies during metro vehicle passing tracks concentrate in the low-frequency range of 0-10 Hz, while the lateral ones concentrate in the 0-30 Hz range. When metro vehicles pass through sections with floating slabs at the speed in 48-60 km/h range, the carbody vertical stability index with worn wheels is approximately 1.8, and the lateral one is around 1.1, both of which are relatively low, indicating less carbody vibration and lateral movement, thus better stability.
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