Active control of curve squeal noise
Research Project, 2015
– 2017
Curve squeal is a highly disturbing tonal sound generated by rail vehicles when negotiating a sharp curve. It 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. Regarding the large number of 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 project is therefore to investigate the potential to reduce curve squeal by means of active control especially in the form of dither in an efficient and robust way. Dither 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. In the project, dither control is evaluated and optimized with respect to signal contents by means of an advanced model for curve squeal. Findings from the theoretical analysis will be experimentally evaluated in a test rig.
Participants
Wolfgang Kropp (contact)
Chalmers, Architecture and Civil Engineering, Applied Acoustics
Astrid Pieringer
Chalmers, Architecture and Civil Engineering, Applied Acoustics
Funding
Swedish Research Council (VR)
Project ID: 2014-5803
Funding Chalmers participation during 2015–2017
Related Areas of Advance and Infrastructure
Sustainable development
Driving Forces
Building Futures (2010-2018)
Areas of Advance