Hsu, S.S., Huang, Z., Iwnicki, S.D., Thompson, D.J., Jones, C.J.C., Xie, G. and Allen, P.D.
Experimental and theoretical investigation of railway wheel squeal
Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 221F, (1), . (doi:10.1243/0954409JRRT85).
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The tangential contact forces that arise at the interface between the wheel of a railway vehicle and the rail provide all the traction, braking, and guidance required by the vehicle. These forces are the result of microslip or creepage and can become unstable exciting vibration of the wheel, particularly at frequencies corresponding to the wheel's axial (and radial) modes.
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