@CONFERENCE\{IMM2013-06705,
    author       = "H. True",
    title        = "A Review on the Linear and Nonlinear Critical Speeds",
    year         = "2013",
    booktitle    = "Conference on Recent Advances in Railway Engineering, ICRARE2013, Tehran, Iran, April",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "School of Railway Engineering, Iran University of Science and Technology",
    organization = "",
    address      = "Farjam St, Tehran 16846-13114, Iran",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/6705-full.html",
    abstract     = "In recent years several authors have proposed 'easier numerical methods' to
find multiple attractors and the critical speed in railway dynamical problems.
Actually, the methods do function in some cases, but they are not safe in the
sense that you will calculate the relevant critical parameter values with a
reasonable accuracy. In some cases the 'easier numerical methods' are really
just a gamble. In this presentation the methods will be discussed. For this
purpose linearisations of the nonlinear dynamical problem are made. A
linearisation of the nonlinear dynamical problem simplifies the calculations and
may give relevant answers to important questions such as the possibility of
resonance phenomena in the designs, but a linearisation is not always allowed, and it does not help to find the critical speed of a railway vehicle.
We shall also address the curious fact that the hunting motion is more robust than the ideal stationary state motion in the track."
}