Abstract
Wheel squeal is a tonal noise generated when a train negotiates a curve, whose sound pressure level is normally 30 dB above rolling noise. The sound pressure level of wheel squeal has been shown to increase with the angle of attack and rolling speed in both field and laboratory tests, but the causes behind the manner of increase are still unknown. To investigate this, a model in the time domain was developed by integrating the contact mechanics with the vibration of the wheel to demonstrate how the nonlinear friction creep behavior interacts with the wheel vibration. This model simulated the vibration velocity of the testrig wheel at different rolling speed and angle of attack. The results correlate well with the recorded sound pressure level of wheel squeal. The lateral creepage and lateral force in various situations were also simulated. It was found that due to the interaction of wheel vibration with lateral force and lateral creepage the vibration velocity amplitude of the wheel at a high angle of attack and rolling speed is larger. This explains why the sound pressure level of wheel squeal also increases in the same manner. The phenomenon is explained theoretically using the mechanics based model.
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