Characteristics Experiment Research And Influence On Dynamic Performance Of Anti-Yaw Dampers

Anti-yaw damper is the key component to ensure the vehicle’s running stability and smoothness with high speed, and its dynamic characteristics have a significant effect on the dynamic performance of high-speed vehicles. In this paper, the measured data of dynamic stiffness and damping characteristics has been collected via the building of anti-yaw damper mechanical properties test bench based on the Maxwell equivalent parameter model. Besides, through the co-simulation of Simpack and Matlab/Simulink, the effect of different anti-yaw damper characteristics on high-speed EMUs will be discussed. This provides a reference for the optimization and selection of EMUs yaw damper.First, this paper builds an anti-yaw damper equivalent parameters of Maxwell model to analyze the relationship between the damping force and vibration velocity, displacement and frequencies, then deducing dynamic damping and dynamic stiffness formula. It introduces the anti-hunting wide absorption-band model, the low frequency damping effect and high frequency stiffness effect.Secondly, to build a anti-yaw damper dynamic characteristics test bench. Through the analysis of the experiment results, relative angles between anti-yaw damper’s dynamic stiffness, dynamic damping, damping force and vibration displacement under different stimulating condition have been discovered. The experimental results show that the anti-yaw damper has a significant frequency-dependent and amplitude-dependent properties. Different anti-yaw dampers dynamic characteristics have significant difference, also the dynamic performance of the same shock absorber may have a distinct change after a period of use.Finally, through the co-simulation between Simpack and Matlab/Simulink, this paper builds the vehicle dynamics model and the anti-yaw damper model based on test data, and discusses the influence of different characteristics of exception conditions yaw damper system on the vehicle dynamics performance. The simulation results shows that:in the low taper tread, it prones to have carbody hunting, so people should choose a larger low-frequency damping anti-yaw damper; In the high taper tread, it would be easy to have small hunting when vehicle operating at a high speed, and cause the larger lateral acceleration of frame and even ultra-limit alarming. So the dynamic stiffness of anti-yaw damper at high frequencies should be taken an adequate consideration.