(Continued from number 293(2006)3-5, page 691-700) This paper is the second of a series of three, dealing with curve squeal of urban rolling stock such as metros and tramways. Measurements were carried out on a 1/4 scale test rig, they include parametric variations on a mono block wheelset and tests of anti-squealing solutions. The parametric variations show little influence of load and lateral contact position, except in the case of contact between the wheel flange and the rail, which prevents squealing. A relation between noise level and two kinematic parameters, rolling speed and angle of attack, is confirmed experimentally. The test of solutions leads to the determination of the damping value of the main wheel mode which is needed to suppress curve squeal. The average friction coefficient as a function of lateral creep is measured in dry conditions and with water. Two results of the parametric variations of great practical importance can be pointed out: squeal sound pressure amplitudes emitted by undamped wheels increase in direct proportion to rolling speed and to angle of attack, and curve squeal disappears when the wheel flange is in contact with the rail. Both results are in full accordance with the field experiments on a metro system. In addition, the influence of vertical load and lateral contact position (without wheel flange contact with the rail) are shown to be negligible. Finally, a threshold value of damping of the 0L,2 mode required to prevent squeal occurrence with good confidence is proposed: a loss factor of 3%. Thresholds for the other wheel axial modes with higher order (n > 2) can be deduced from this value. (To be continued)


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    Title :

    Curve squeal of urban rolling stock - part 2: parametric study on a 1/4 scale test rig


    Additional title:

    Kurvenquietschen von städtischen Schienenfahrzeugen - Teil 2: Parameterstudie an einem 1/4 Maßstab-Prüfstand


    Contributors:
    Koch, J.R. (author) / Vincent, N. (author) / Chollet, H. (author) / Chiello, O. (author)


    Publication date :

    2006


    Size :

    9 Seiten, 7 Bilder, 3 Tabellen, 2 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English