时速400 km高铁最小曲线半径地段列车动力学性能研究

Study on Dynamic Performance of Train in Curve Section with Minimum Curve Radius for High-speed Railway with Design Speed of 400 km/h

为了研究时速400 km高铁列车经过最小曲线半径地段时的动力响应特性,建立曲线地段CRH380B列车-轨道耦合动力学模型,从时域、频域对比仿真数据与综合检测列车实测数据,验证仿真模型的正确性。模拟列车以400 km/h速度通过7000 m半径曲线路段下的各种轨道不平顺工况,以各动力响应峰值为控制指标,并结合相干性分析,得出长波高低与轨向不平顺最大敏感波长分别为150 m和200 m。曲线地段的车体垂向加速度峰值、车体横向加速度峰值、脱轨系数峰值、轮重减载率峰值、轮轴横向力峰值分别是直线地段的1.21倍、7.58倍、4.8倍、1.17倍、3.25倍,表明线路条件改变对车体垂向加速度、轮重减载率的影响较小,对车体横向加速度、脱轨系数、轮轴横向力的影响显著。研究结论可为运营期的行车舒适性和安全性评价、轨道平顺性评价提供理论依据。

To study the dynamic response characteristics of the trains with design speed of 400 km/h passing through the curve section with minimum curve radius,a CRH380B vehicle-track coupling dynamics model in the curve section was established.By comparing the simulation data and the measured data obtained through comprehensive inspection train,from both time and frequency domains,the correctness of the simulation model was verified.As the train passes through 7000 m radius curve section with the speed of 400 km/h,various track irregularities were set in the model.Combined with coherence analysis,the maximum sensitive wavelength of track vertical profile irregularity is 150 m and sensitive wavelength of track alignment irregularity is 200 m.The peak values of vertical acceleration on the vehicle body,lateral acceleration on the vehicle body,derailment coefficient,wheel load reduction rate,lateral force on the wheel axle are 1.21 times,7.58 times,4.8 times,1.17 times,and 3.25 times respectively,which indicate that changes of railway line parameters have a small impact on the vertical acceleration and wheel load reduction rate,and have a significant impact on the lateral acceleration,derailment coefficient,and lateral force.The conclusion can provide theoretical basis for the evaluation of driving comfort and safety during the operation period,as well as the evaluation of track irregularity.