Availability of five hydraulic damper models for dynamics simulation and application of two types of high-speed electrical multiple units

Junlin Ren, Qiang Li, Zunsong Ren, Guangxue Yang and Yangmin Wu

International Journal of Rail Transportation, 2025, vol. 13, issue 6, 1239-1254

Abstract: To attenuate oscillations of railway passenger vehicles, hydraulic dampers are widely employed in suspension structures, for which high-speed electrical multiple units (EMUs) with excellent dynamics performance are critical. This study employs a vehicle-track coupling model to predict damper loads with an operation speed of 400 km/h. Five models characterizing hydraulic damper dynamics, namely the simplification model, Maxwell model, the new damper model presented by Ren, and two new damper models presented in this paper, are employed to study the availability of the damper models in simulating vehicle dynamics. Field-tested loads of the damping forces for the dampers of two types of EMUs are used to fulfill the investigation. It indicates that the damping velocity and unloading velocity of the damper is critical to the damping load and vehicle dynamics. The simplification model and Maxwell model have some deficiencies in the vehicle dynamics calculation, especially as the unloading velocity of the damper is much low.

Date: 2025
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DOI: 10.1080/23248378.2024.2438672

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International Journal of Rail Transportation is currently edited by Wanming Zhai and Kelvin C. P. Wang

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