Analysis of the wind field relative

Analysis of the wind field relative to the vehicleThe auto-correlation of the vehicle, as is shown in Figure 8, also corresponds well with thetarget. Another phenomenon worth noticing is that, with the increase of operation velocity,the auto-correlation value drops more significantly. As the velocity speeds up, the distancecovered within the same time interval also augments, which will inevitably lead to the loss ofauto-correlation for the vehicle, and further influence the auto-correlation of the vehicle.In regard to the wind spectra relative to the vehicle with different velocities in Figure 9, theresults are generally in accordance with the target. However, at frequency ranges below 0.01Hz, there are still some disparities. In the wind response analysis of the wind-vehicle-bridgecoupled system, the frequency range between 0.5 and 1.0 Hz, where lies the naturalfrequency range of the high-speed railway car body (Cheli et al. (2012)), is of most importance. In thisfrequency range the simulated results are quite satisfactory.It appears that, both the auto-correlation function and wind spectrum relative to the vehicle ofthe proposed method coincide with the target. Hence the proposed method is suitable for thesimulation of wind field of the vehicle-bridge united system.