Effect Of Linear Parameters On Vehicle Vibration Response In Different Frequency Domains And Vibration Evaluation

ABSTRACT:With a long vibration attenuation of high-speed train, the effect of superimposed vibrations on comfort is even more remarkable. Linear setting of railway line causes the deterioration of passenger comfort even under smooth track conditions. Based on a high-speed rail-vehicle dynamic model, Both vehicle’s vertical vibration under profile settings and vertical, horizontal and rolling vibration under plane setting were investigated firstly. Motion sickness and comfort evaluation of these vibration responses in0.02～4Hz and0.5～80Hz were then carried out based on the basic evaluation method in frequency domain defined in ISO2631.For vertical curve setting, vertical vibration response under different lengths between two curves, different proportions of vertical curve and different running speeds have been investigated. The results shows that vibration overlap can be controlled with different lengths between vertical curves; the comfort index tends to be smooth when that distance is longer than200m; the dominant frequency of vertical acceleration is related to running speed of the train and length of the vertical gradient, whichmayoverlap sensitive frequency bands of motion sickness. Finally a set of recommended values of the length between vertical curves are proposed based on avoidance of both vibration overlap and sensitive frequency bands of motion sickness.For plane setting, vibration responses under different lengths of transition curve and different directions of continuous curves have been investigated. The result shows that the length of transition curve affects the low-frequency discomfort of passengers in high-speed train. When the transition curve length is greater than650m, increasing the length will not have greater impact of high-speed passenger train’s rolling vertical and lateral vibration comfort (motion sickness). Thus, the transition curve length of a curve with175mm largest ultra,5500m curve radius and210m circular curve length is recommended to be650m; The dizziness caused by rolling angular velocity and lateral vibration acceleration of the vehicle body is significantly increased under setting of reverse curves.