Study for Prediction of Contact Forces between Wheel and Rail Using Vibrational Transfer Function of the Scaled Squeal Noise Test Rig

Abstract

Curved squeal noise may result when railway vehicles run on curved tracks. Contact between the wheels and the rails causes a stick-slip phenomenon, which generates squeal noise. In order to identify the mechanism of the squeal noise systematically, a scaled test rig has been fabricated. Knowledge of the contact forces between the wheels and the rail rollers is essential for investigating the squeal noise characteristics; however, it is difficult to measure there contact force. In this study, contact forces have been calculated indirectly according to the modal behavior of the subframe that supports the rail roller and the responses at specific positions of that subframe. In order to verify the estimated contact forces, the displacements at the contact points between the wheels and rail rollers have been calculated from the estimated forces; the resulting values have been compared with the measured displacement values. The SPL at the specific location has been calculated using the estimated contact forces and this also has been compared with the SPL, measured in a semi-anechoic chamber. The comparisons in displacements and SPLs show good correlation.

Local coating of curved rails by using low friction material for squeal noise reduction

“…In addition, the microphones were installed at the left and right points approximately 0.3 m away from the scale tester, and the noise for each yaw angle was measured, as shown in Figure 6. 18,19 In the twin-disc model used in this study, the lateral creep between the wheel and rail discs has the following correlation.…”

“…In addition, the microphones were installed at the left and right points approximately 0.3 m away from the scale tester, and the noise for each yaw angle was measured, as shown in Figure 6. 18,19…”