Aerodynamic Load and Structural Vibration Response Characteristics of Noise Barriers of High Speed Railway
Noise barrier of high speed railway is a common measure for railway noise control.However,it is close to the center of the line and will generate vibration response under the action of train power.The aerodynamic load formed by the train wind acting on the surface of the noise barrier and the rail vibration generated by the wheel-rail contact force are further transmitted to the foundation of the noise barrier,which are the main source of wind induced vibration and wheel-rail excitation vibration in the sound barrier structure.The test and simulation of train aerodynamic load and noise barrier vibration response were carried out.The aerodynamic load and vibration response characteristics of noise barrier under different conditions were obtained.The results show that when the EMU(Electric Multiple Units)operates at 350 km/h,the aerodynamic load and vibration response of the noise barrier increase by about 40%compared with 300 km/h operation.At the same speed level,the top displacement of the subgrade noise barrier column is about 40%～50%higher than that of the bridge noise barrier,while the dynamic displacement of the bridge noise barrier unit plate is about 20%～30%higher than that of the subgrade noise barrier.The wheel-rail excitation vibration directly affects the vibration response of the sound barrier,which tends to attenuate regularly during the transmission process.When the train wind and cross wind act together,the dynamic deformation and dynamic stress of the noise barrier column show a significant increase trend.
high speed railwaynoise barriersexperimental studyaerodynamic loadwheel-rail excitationvibration response
万方数据
维普
