Model-based estimation of rail profile based on axlebox accelerometers

Reliable axlebox based measurement of rail roughness has been a fervent topic of research recently, due to its potential low-cost convenience and network coverage. Present research results for model-based estimation of rail roughness, based on axle-box accelerometers, are presented. A mechanics based model is developed, taking into account the dynamic characteristics of the track and bogie for estimation of rail profile, based on multiple accelerometer measurements on both sides of the track. The model is tested and validated against field measurements of rail profile data. In particular, impact response testing of the vehicle (AK car) is first performed to determine the dynamic characteristics of the axlebox in response to various force inputs. This understanding is used to tune the model that is then applied to field accelerometer measurements from left and right axle boxes to predict the rail profiles. The comparison of these measurements with the field profile measurements is performed to reveal the importance of various aspects of the model. The results highlight the importance of considering vibrational input from both sides of the track as well as the effects of speed and track and vehicle dynamic characteristics. The danger of using simplified double integration models, such as substantial speed dependent errors, is highlighted.

Media Info

  • Pagination: 8p.
  • Monograph Title: Rejuvenation and renaissance: CORE 2010: conference on railway engineering, 12-15 September 2010, Wellington, New Zealand

Subject/Index Terms

Filing Info

  • Accession Number: 01517074
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Mar 4 2014 8:06PM