Simplified physical parameter model for bidirectional-flow yaw dampers

HUANG Cai-hong; YANG Lian-peng

doi:10.19818/j.cnki.1671-1637.2025.06.009

Volume 25 Issue 6

Dec. 2025

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HUANG Cai-hong, YANG Lian-peng. Simplified physical parameter model for bidirectional-flow yaw dampers[J]. Journal of Traffic and Transportation Engineering, 2025, 25(6): 98-111. doi: 10.19818/j.cnki.1671-1637.2025.06.009

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HUANG Cai-hong, YANG Lian-peng. Simplified physical parameter model for bidirectional-flow yaw dampers[J]. Journal of Traffic and Transportation Engineering, 2025, 25(6): 98-111. doi: 10.19818/j.cnki.1671-1637.2025.06.009

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Simplified physical parameter model for bidirectional-flow yaw dampers

doi: 10.19818/j.cnki.1671-1637.2025.06.009

HUANG Cai-hong^,,
YANG Lian-peng

State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

Funds:

National Natural Science Foundation of China 52475136

Science and Technology Research Project of China Railway Group Co., Ltd. P2024J001

Independent Project of the State Key Laboratory of Rail Transit Vehicle System 2025RVL-T01

More Information

Corresponding author: HUANG Cai-hong (1985-), male, associate researcher, PhD, c_h_huang@126.com
Received Date: 2025-01-03
Accepted Date: 2025-04-30
Rev Recd Date: 2025-03-27
Publish Date: 2025-12-28

Abstract

Abstract

To meet the demand of fast and accurate dynamic simulation, a simplified physical parameter model of bidirectional-flow hydraulic yaw dampers was established. According to the working principle of the dampers, the flow rates of compression damping valves and base damping valves during the compression stroke were reasonably allocated. The conversion between static damping characteristic curve and pressure-flow curve was achieved, and then a simplified damping valve model suitable for this type of yaw damper was constructed. Flow rates through each valve system were calculated, and the oil leakage effect and compression effect were considered. Macroscopic pressure-flow equations of each chamber were established. The Runge-Kutta method was adopted for numerical solution of pressure in each chamber, thus dynamic behavior of the yaw damper was described. According to the actual working conditions of yaw dampers, a simulation and bench test comparison of the dynamic characteristics of dampers was carried out, and differences and key influencing factors of dynamic characteristics between unidirectional-flow and bidirectional-flow yaw dampers were analyzed. Research results show that the force-displacement curves, force-velocity curves, and force-time domain curves of the damper from simulation and test are highly consistent. The errors of dynamic stiffness and dynamic damping obtained from post-processing compared with the test results are within 10%. The dynamic behavior of the damper can be accurately reflected by the model. Under 1 s sinusoidal excitation, the simulation time of the complex physical parameter model exceeds 300 s, while that of the simplified physical parameter model at different frequencies does not exceed 0.5 s. Simulation efficiency is significantly improved. Compared with the unidirectional-flow yaw damper, the bidirectional-flow yaw damper has a shorter oil circuit in extension and compression strokes, its force-displacement curve area is larger, and symmetry is better, thus exhibiting higher dynamic stiffness. An increase in air dissolution rate and leakage gap significantly reduces the dynamic stiffness and dynamic damping of yaw dampers. Increasing the stiffness of rubber joints can enhance the dynamic stiffness and dynamic damping of yaw dampers; however, their effect gradually weakens after rubber joint stiffness reaches a certain level. At this time, the series stiffness of yaw dampers is mainly dominated by oil elasticity. The established model extends the simplified physical parameter model to the bidirectional-flow yaw damper. It features high calculation efficiency and is applicable to vehicle dynamics simulation.
- railway vehicle,
- yaw damper,
- bench test,
- simplified physical parameter model,
- flow continuity equation,
- dynamic characteristic

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References(45)

References

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Simplified physical parameter model for bidirectional-flow yaw dampers

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