车辆激励谱的时频转换复现技术

Frequency-Time Transform Technology of Vehicle Excited Spectra

铁路车辆运行过程中的振动主要是因为轨道不平顺引起的强迫振动，在对车辆系统或车辆－线路（桥梁）耦合系统进行动力学分析和滚动振动台试验时，如何在时域和频域内描述车辆系统激励谱的特性，并在保持谱的频率、相位和幅值特征不丢失的情况下进行时域和频域间的转换具有非常重要的意义。本文参照现代控制理论中的远程参数控制技术，构造了车辆激励谱的保真时频转换算法，很好地解决了转换过程中谱特性丢失的问题，为系统特性试验及动力学仿真计算提供了重要手段和支持。

Vibration of railway vehicle is mainly forced vibration due to random track irregularity.When dynamic behavior of railway vehicle/track (bridge) system is analysed through computer simulation and/or roller rig and vibrostand experiment, it is very important how to describe the dynamic behavior of a vehicle excited spectra and transform them between time and frequency domain with out leaking of the spectral distribution character of stimulator. On the basis of remote parameter control theory a frequency-time transfer algorithm for vehicle excited spectrra is constructed,and the problem of leaking of spectral distribution character is solved successfully.It is very useful for the computer dynamic simulation, roller rig/vig/vibrostand experiment and field test of railway vehicle.