地铁列车曲线运行振动源强特性分析

An important characteristic of urban rail transit lines is a high proportion of curves. When a train passes through a curved track, its special vibration source intensity characteristics produce environmental vibration impacts different from those of a straight track. Previous calculations and evaluations did not take this into serious consideration, thus resulting in relatively large evaluation errors. As an important factor in the assessment of rail transit environmental vibration and secondary noise, the vibration source intensity generated by the curved running of subway trains has not been clearly studied so far. To fill this gap, based on the wheel-rail following mode and using the frequency domain analytical method, this paper establishes an analytical model of the dynamic coupling of the curved track and the vehicle, and systematically and in-depth studies the vibration intensity, direction and frequency domain response characteristics of the reaction force of the source intensity of the subway curved track, and studies the causal relationship between the key vehicle-track parameters and the vibration source intensity during curved running. This will improve the accuracy of predicting the vibration impact of curved tracks and meet the actual needs of predicting and evaluating the environmental vibration impact of urban rail transit.

城市轨道交通线路的一个重要特征是曲线占比高,当列车通过曲线轨道时,其特殊的振动源强特性产生了与直线轨道不同的环境振动影响,以往计算与评估并未对此做出严谨的考虑,从而带来了较大的评估误差。作为轨道交通环境振动与二次噪声评估的一个重要因素,地铁列车曲线运行产生的振动源强,至今为止尚未研究清楚。为了填补这一空白,本文基于轮轨跟随模式,采用频域解析方法,建立了曲线轨道-车辆动力耦合解析模型,系统深入地研究了地铁曲线轨道源强支反力的振动强度、方向以及频域响应特性,研究了曲线行车时车-轨关键参数与振动源强的因果关系。这将提高曲线轨道振动影响预测的准确性,满足城市轨道交通环境振动影响预测与评估的实际需要。