地铁列车曲线运行振动源强特性分析

Study on Characteristics of Vibration Sources of Metro Trains Running in a Curved Track

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。

An important feature of urban rail transit is the high proportion of the curved track.As the subway train operates on the curved track, the special vibration characteristics caused by the impact between the curved track and vehicle will make different environmental vibration influence from the impact between the straight line and the vehicle.However, previous calculations and evaluations have not taken this into account rigorously, causing a certain error in the evaluation of train-induced environment vibration.As an important factor affecting the train-induced environmental vibration and the secondary noise of the structure, the vibration source generated during the subway train passing through the curve track has been unclear so far.In order to fill this gap, an analytical model of coupled vehicle-curved track in the frequency domain was established.Based on this model, the vibration source intensity, direction and frequency domain response characteristics of the curved track were analyzed systematically.The relationship between the vibration source of the curved track and the key parameters of the vehicle-rail was also studied.Therefore, the accuracy of curved track vibration impact prediction can be improved and it will be sufficient to meet the needs of the accuracy and reliability for the prediction and assessment of train-induced environmental vibration.