Abstract
The roller rig and the running tests were performed in this study to characterize curve squeal and its relation to wheel vibration. The results of and the differences between the tests are presented. The tests show consistent wheel vibration for rolling noise. The wheel vibration associated with curve squeal in the roller rig test was generated even at 5 km/h, with the greatest wheel vibration observed at 2 kHz. The wheel vibration in the running test was not generated clearly at 5 km/h, and the curve squeal at 2 kHz resembled that in the roller rig test above 15 km/h. Parameters related to the wheel and rail contact and the vibration characteristics of the wheel and the rail influence the curve squeal. The roller of the rig exhibited specific natural frequencies, and coincidence with several frequencies of the wheel response increased wheel vibration. Although the roller rig potentially simulates actual situations, the parameters and the vibration characteristics require appropriate tuning to correctly evaluate squeal.
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