Does a critical speed for railroad vehicles exist?

Hans True

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    The author discusses the definition and existence of a critical speed for the onset of hunting of railroad vehicles. First the field test situation is described. It is argued that the important problem is the determination of the forces and accelerations in the vehicle and the rails, which may be large even when the vehicle does not hunt. Next the author discusses the relevance of the critical speed in railway engineering. It is desirable to know the speed below which a vehicle will not hunt, since hunting is always connected with large wheel-rail forces. Next the modelling of railroad vehicles is discussed and the nonlinear aspects are emphasized. The author explains why it is necessary to reformulate the mathematical problem for calculation of the critical speed due to the nonlinear character of the modelling. It is suggested that another critical speed be defined for a railroad vehicle. It can be calculated without great effort using a well functioning simulation program. It yields a “global” criterion for the onset of hunting, in contrast to the linear stability criterion, which is still commonly used. The linear eigenvalue problem yields a bifurcation point, which in general will not be the lowest parameter value for existence of oscillating solutions in a nonlinear dynamical system. The author suggests the use of a “nonlinear critical speed” as an acceptance criterion for railroad vehicles
    Original languageEnglish
    Title of host publicationProceedings of the ASME/IEEE Joint Railroad Conference
    Publication date1994
    ISBN (Print)07-80-31890-0
    Publication statusPublished - 1994
    EventASME/IEEE Joint Railroad Conference : Area Annual Technical Conference - Chicago, IL
    Duration: 1 Jan 1994 → …


    ConferenceASME/IEEE Joint Railroad Conference : Area Annual Technical Conference
    CityChicago, IL
    Period01/01/1994 → …

    Bibliographical note

    Copyright: 1994 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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