Mechanism of Tail Lateral Sway of City EMUs in Single-track Tunnel

doi:10.3901/JME.2025.20.204

Abstract

Abstract: Aiming at the lateral sway of the tail car when a domestic type of urban EMU with a speed of 160 km/h is running in a single-track tunnel, the influence mechanism of aerodynamic excitation on the lateral sway of tail car was revealed, and the mitigation measures are studied from the perspective of suspension parameters optimization. According to the actual shape and dynamic parameters of the city EMUs, the aerodynamic and multi-body dynamic models of the 8-car train are established respectively. Overset mesh technique is used to obtain the aerodynamic forces of train, which are applied to the vehicle body as external excitations, and then the fluid-solid coupling simulation model of the train is constructed. And the root locus analysis method is used to grasp the evolution of vehicle suspension modals and hunting modals, the results show that in the single-track tunnel, the aerodynamic forces on each car from front to rear gradually increase, and the difference between the head car and the tail car is very obvious. The aerodynamic forces of the tail car are in the form of harmonics, and the main frequency of each aerodynamic force is in the range of 0.5-3 Hz, which is close to the vibration modals of the vehicle system itself. The upper rolling modal and yawing modal of the vehicle have modal-hopping and coupled resonance with in-phase and out-phase of hunting motion of two bogies respectively, which causes primary serpentine of train. The main frequency of the large yaw aerodynamic moment have the coupling resonance with the hunting modal frequency of the whole vehicle，which is the important reason for the lateral sway of the tail car. Changing the hunting frequency or increasing the damping ratio by optimizing the suspension parameters of vehicle is an effective measure to alleviate the sway of the tail car. Reducing the damping coefficient of the anti-yaw damper, increasing the damping coefficient of the secondary lateral damper, reducing the longitudinal stiffness of the primary, increasing the equivalent conicity, and adding the lateral damper between front and rear cars can relieve the lateral sway of the tail car to a certain extent, and improve the running stability and ride comfort.

Key words: city EMUs, tail lateral sway, aerodynamic characteristics, fluid-solid coupling, root locus analysis, suspension parameters optimization

CLC Number:

U270

HU Zhe, CHI Maoru, ZHOU Yabo, DAI Liangcheng, LIANG Shulin, CHEN Jianzheng, SUN Jianfeng. Mechanism of Tail Lateral Sway of City EMUs in Single-track Tunnel[J]. Journal of Mechanical Engineering, 2025, 61(20): 204-212.

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