The application of dither for suppressing curve squeal
Paper in proceeding, 2019

Curve squeal is a highly disturbing tonal sound generated by vehicles like railways, metros or trams, when negotiating a sharp curve. The probability that squeal occurs increases with reduced curve radius of the track. Curve squeal noise is attributed to self-excited vibrations caused by stick/slip behaviour due to lateral creepage of the wheel tyre on the top of the rail. With respect to the enormous number of the rolling stock units and the long lifetime of waggons there is an urgent need for a cheap and simple retrofitting measure to reduce curve squeal. The main objective of the paper is therefore to investigate the potential to reduce curve squeal by means of active control in the form of dither in an efficient and robust way. Dither control has been applied in the field of mechanical engineering for systems including non-linear components. There it has been shown to suppress self-excited oscillations very efficiently. The control is an open loop control. It consists in adding a forced vibration to the vibrational system. The demand on this additional signal is that it is higher in frequency than the friction-induced response. From a physical point of view, dither control modifies the effective friction characteristic.

Self-excited vibrations

Curve squeal


Noise control


Wolfgang Kropp

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Arthur Aglat

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Jannik Theyssen

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Astrid Pieringer

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Proceedings of the International Congress on Acoustics

22267808 (ISSN) 24151599 (eISSN)

Vol. 2019-September 1551-1558
9783939296157 (ISBN)

23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019
Aachen, Germany,

Subject Categories

Vehicle Engineering

Control Engineering

Signal Processing



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