Abstract : a mechanical model to analyze the dynamic performance of train and transition section between roadbed and railway bridge was established a nd a series of reasonable criterions were put forward too . based on this , the init ial deformation of rails due to different subsidence of roadbed and bridge abutm ent , the effects of the direction and speed of train on the dynamic performance o f wheel / track system were studied . at last , the method to determinate the length o f transition section was suggested 文摘:建立了列车与路桥过渡段动力特性分析模型，确定了一套轨道过渡段动力特性的评价指标，分析了由基础沉降差引起的钢轨初始变形以及行车方向、行车速度对轮轨系统动力性能的影响，提出了确定路桥过渡段长度的方法。
The noise signal of passing vehicles is gathered with microphone array , and processed off line with the method of wide - band array signal processing , then the estimation of vehicle numbers can be transformed into the estimation of signal source numbers , up and down of the vehicle can be transformed into doa estimation of array signal processing . at the same time , vehicle types are classified using pca method of the pattern recognition based on vehicle noise , and some primarily study is done for vehicle recognition . at last , the result of the experiment proves this method is feasible 对麦克风阵列所采集的车辆行驶时的声音信号，运用宽带阵列信号处理的方法进行离线处理，并将车辆个数的估计转化为阵列信号处理中信号源个数的估计，将车辆上下行的估计转化为阵列信号处理中波达方向变化的估计，进而较准确地估计出了车辆的个数与行车方向；同时对所采集的车辆声音信号应用模式识别中的主分量分析法实现了车辆的简单分类，为实现车型识别作了一些初步的探索。
