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Investigations on the attenuation of squeal noise from a resilient railway wheel by means of piezo-actuators

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Title

Investigations on the attenuation of squeal noise from a resilient railway wheel by means of piezo-actuators

Author

Fehren, H.; Schiedewitz, M.; Siebald, H.; Cigada, A.; Manzoni, S.; Redaelli, M.

Conference

Int. Conference on Noise and Vibration Engineering. Leuven, 2008.

Abstract

The international scientific community is more and more interested in the topic of environmental noise reduction. During the last years, many international research projects, aimed at identifying the most contributing noise sources and a way to reduce their emission, have involved universities, private research centres, and industries too. Considering the noise effect on people in big urban centres, inhabitants experience a lot of noise sources, such as traffic, industrial plants and urban trains.

For this last noise source in particular, one of the most relevant contributions is represented by the squeal of vehicle wheels. Squeal noise is due to the wheel vibrations related to a self-excited phenomenon, which leads to a limit cycle with very high vibration amplitudes. This is the reason why high power control system should theoretically be required to suppress the vibrations and the resulting noise emission. The aim of this paper is to investigate the possibility to prevent the squeal noise from a resilient wheel using active control techniques, by means of smart materials.

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