The brake noise of tread-braked trains consists of broad band noise, mainly radiated by the brake system, and tonal squeal, mainly radiated by the wheels. The mechanism of squeal generation can be studied with a finite element model based on the binary flutter model with a constant friction coefficient, in a similar way as for disk and drum brakes. The broad band noise is probably a combination of judder (forced vibrations due to roughness) and knock (impact motion of brake parts mounted with play). The relative importance of these sources seems to be different for every brake design and depends strongly on the brake block material. Some measures for noise abatement are shown. Avoiding play in the structure is an effective measure to reduce knocking noise of multi-block configurations. Squeal can be reduced by applying a smart wheel damper. Both squeal and broad-band noise can be abated by sprinkling water in the contact surface or by applying an alternative brake block material. On the basis of theory, disturbing the rotational symmetry of the wheel by adding localized masses or stiffnesses is likely to be effective for squeal reduction. More research is needed to map the relative importance of the different brake noise sources in field situations. Progress in the modelling of brake squeal can be made by carefully choosing a study object, preferably a test rig in controlled laboratory conditions.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    A study on the brake noise of tread-braked trains


    Additional title:

    Untersuchung des Bremsgeräusches von laufflächengebremsten Zügen


    Contributors:
    Lier, S. van (author) / Waterman, E. (author)


    Publication date :

    2000


    Size :

    8 Seiten, 2 Bilder, 14 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Noise-related roughness on tread braked railway wheels - experimental measurements and numerical simulations

    Petersson, M. / Vernersson, T. | British Library Conference Proceedings | 2000


    Tests of air-braked trains on mountain grades

    Engineering Index Backfile | 1900


    Thermal capacity of tread-braked railway wheels. Part 2: Applications

    Teimourimanesh, Shahab / Vernersson, Tore / Lundén, Roger | SAGE Publications | 2016