Research on Time and Frequency Domain Characteristics of the Aerodynamic Load on a High-speed Train in the Bridge Tower Environment Under Random Crosswinds
When a train runs at a high speed,strong crosswinds will cause abrupt change of aerodynamic loads on the high-speed train and may cause the overturn of the train.This article compares and analyzes the time domain characteristics of aerodynamic loads on the lead unit of a certain type of high-speed train in the bridge tower environment under constant and random crosswinds and performs the fast Fourier transform on its aerodynamic load,to obtain the spectrum distribution characteristics.The result shows that under constant crosswinds,the aerodynamic load on the high-speed train changes gently and the fluctuation is obviously gentler than that under random crosswinds;while under the random crosswinds,as the basic-frequency wind speed increases,the extreme value of aerodynamic load remains basically unchanged,but the number of extreme values increases,which indicates that the increase of the random crosswind model and the basic-frequency wind speed has a significant impact on the change of aerodynamic load on the train.The power spectral density of aerodynamic load is concentrated in the range of 0～5 Hz,and the maximum corresponding frequency is concentrated in the range of 0～1 Hz,which indicates that the frequency of unsteady aerodynamic load on the train caused by crosswinds is relatively low,which is very close to some inherent vibration mode frequencies of the train itself and easy to form the resonance;compared with the constant crosswinds,the peak power spectral density of aerodynamic load under random crosswinds is larger and increases with the increase of the basic-frequency wind speed.
random crosswindbridge toweraerodynamic loadtime domainfrequency domain
NETL
NSTL
万方数据
维普
