Longitudinal vibration of a resilient wheel under the adhesion limit

Abstract

In order to study the longitudinal vibration law of a resilient wheel under the adhesion limit of different working conditions, two longitudinal vibration models of the resilient wheel of a motor vehicle are established, and the vibration laws and influencing factors of the resilient wheel under different operating conditions are studied by simulation. The model of the resilient wheel under low-speed driving and low adhesive operating conditions is established based on the Fastsim wheel/rail contact theory, and the other high-speed model of the resilient wheel is established by considering adhesion curve negative slope characteristics based on the Polach wheel/rail contact theory. The results show that at low-speed driving conditions, the longitudinal vibration of the resilient wheel is more violent than that of the solid wheel, and the sliding vibration of the resilient wheel at the adhesion limit is far greater than the nonadhesion limit at low-speed driving conditions. When the rail surface is polluted and the adhesion coefficient is low, with the speed increasing to 80 km/h, stick-slip vibration occurs on the resilient wheel due to the increased vibration between the wheel rim and the wheel hub. Under high-speed conditions, owing to the negative slope characteristic of the adhesion curve, the wheel adhesion recovery time decreases with the reduction of driving torque. The amplitude of vibration for the above two conditions increases with the increase in the stiffness of the motor boom and the longitudinal stiffness of the primary suspension. With the increase in the value of the radial stiffness and torsional stiffness of the resilient wheel, the vibration amplitude of the resilient wheel becomes smaller or suppressed. The vibration of the resilient wheel is transmitted to the frame through the primary suspension, which has little effect on the vibration of the vehicle body.

An investigation into the effect of resilient wheel stiffness on the dynamic behaviour of a metro vehicle running along a tangent track

“…Based on this model they concluded that vehicle dynamics behaviour was much more sensitive to the radical and axial stiffness of the rubber than to its rotational stiffness. Later, Yang et al (2019) established a 6-DOF multi-body model of resilient wheel and integrated it into a metro vehicle dynamics system, to study the longitudinal vibration law of a resilient wheel under the adhesion limit of different working conditions. Material properties for the resilient wheel model were properly selected by making the calculated stiffness close to that measured.…”

“…While, the validation of the prediction model of the whole vehicle system with the resilient wheel was not given, either the measured rail irregularity was not considered in the working conditions. (Yang et al, 2019)…”

Characteristics of Vibration and Sound Radiation of Metro Resilient Wheel

“…Claus et al [21,22] established the vertical dynamics model of the ICE railway car to study the possibility of resilient wheels reducing the low frequency interior noise. Yang et al [23] studied the longitudinal vibration law of a resilient wheel under low-and highspeed driving conditions. In previous research, there were hardly any studies on the reduction of vibration and noise for the application of resilient wheels under the operating conditions of the metro.…”