长波高低不平顺与车体垂向加速度关联模型研究

Research on Relationship Model between Long-wave Profile Irregularity and Car-body Vertical Acceleration

轨道不平顺是车辆振动的主要激励源,随着车辆运营速度的增加,引起车辆振动加剧的不利波长也在变化。本文利用谱分析方法对0号高速综合检测列车实测数据进行分析,得到高速条件下长波高低不平顺和车体垂向加速度在空间频域上的分布规律,分别采用非参数模型和ARX模型构建长波高低不平顺与车体垂向加速度之间的关联关系,并利用系统辨识技术对两种模型的传递函数进行估计。通过将两种关联模型分别与长波高低不平顺结合,实现车体垂向加速度的预测;并与实测车体垂向加速度进行相关性和相干性分析。结果表明,两种模型均能较好反映长波高低不平顺与车体垂向加速度之间的传递关系。通过比较,ARX模型比非参数模型更精确。

Track irregularity is the main excitation source of vibration of vehicle .The detrimental wavelength that aggravates vehicle vibration changes with the increase of vehicle operation speed .On the basis of deep a‐nalysis on the measured data from Number 0 comprehensive inspection train ,spectral analysis method is applied to extract the distribution law of long‐wave profile irregularity and car‐body vertical acceleration in space fre‐quency domain under high speed condition .Nonparametric model and ARX model are introduced to describe the relationship between the long‐wave profile irregularity and the car‐body vertical acceleration ,and the transfer function between them is estimated by the use of system identification technique .The two correlation models are combined respectively with the long‐wave irregularity to calculate the car‐body vertical acceleration .The correlation and coherence analyses are done between the predicted and measured data .The results show the two models can effectively characterize the transferring relationship between the long‐wave profile irregularity and the car‐body vertical acceleration .By comparison ,the ARX model is more accurate than the nonparametric model .