Operational Safety Characteristics of High-speed Train under Strong Wind and Rainfall Environment

doi:10.3901/JME.2021.20.172

Abstract

Abstract: In order to ensure the safe operation of the high-speed train exposed to strong wind and rain environment, the aerodynamic characteristics and operational safety characteristics of the high-speed train in wind and rain environment are systematically studied using the EULER-LAGRANGE method and computational multi-body dynamics method. The aerodynamic computational model of a high-speed train is set up based on non-spherical raindrops. After the the accuracy of the computational model is verified, the aerodynamic loads of the high-speed train operating in a strong wind and rain environment are computed. The vehicle system dynamic model of the high-speed train is established, and the operational safety characteristics of the high-speed train exposed to strong wind and rain loads are computed. The results show that the side force, lift force, rolling moment and yaw moment of the high-speed train increase with the increase of the rainfall intensity for a variety of wind speeds, and there is approximately a linear relationship between the aerodynamic loads and the rainfall intensity. For the pitch moment, it increases with the increase of the rainfall intensity for the relatively smaller wind speeds, and decreases with the increase of the rainfall intensity for the relatively larger wind speed. Compared with the pure strong wind environment, the rainfall further deteriorates the operational safety characteristics of the high-speed train. The derailment coefficient, wheel load reduction rate, overturning coefficient, and axle lateral force of the high-speed train increase with the increase of the rainfall intensity for a variety of wind speeds. Especially, when the wind speed is close to the critical wind speed, the impact of rainfall on the operational safety characteristics of the high-speed train is significant. When the rainfall intensity is 500 mm/h, the critical wind speeds for the safe operation of the high-speed train determined by different operational safety indicators are reduced by 2.3-4.2 m/s. The results can provide a reference for the speed limit of the high-speed train in wind and rain environment.

Key words: high-speed train, rainfall intensity, aerodynamic performance, operational safety, critical wind speed

CLC Number:

U270

YU Mengge, LIU Jiali, LI Tian, ZHANG Qian. Operational Safety Characteristics of High-speed Train under Strong Wind and Rainfall Environment[J]. Journal of Mechanical Engineering, 2021, 57(20): 172-180,193.

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