Skip to content

044 Speed ​​Reduction after wheel damage II

Published: 8 February 2017

Investigation of the current speed reductions at the high level alarm from Trafikverket wheel damage detectors.

Today's rate reductions at the high level alarm from Trafikverket wheel damage detectors need to be investigated. The relationship between the nature of the damage, power, size and ambient temperature today is the basis for the rate reductions apply for high-level alarm. The work shall be limited to RC locomotives and their speed-dependent when it comes to power generation off the wheel and then measured in Trafikverket detectors. Specifically, the focus is on speed range 50km / h up to full speed 160 km / h. Operators and Traffic Authority wishes basis for future standards and regulations that will describe the action when an alarm occurs. Is it worthwhile for example, reducing the speed of 20 km / h under normal STH or measure such meaningless? RC locomotives operate usually in the range 90-160 km / h.

results Description

The main conclusion of the study is that a speed dependence of impact forces due. wheel disc could not be identified in the use of the speed range, which is in line with the results of other recent studies. These have shown a weak dependence or even negative depending on the speed. The uniqueness of this study lies in the use of realistic worn lokhjul and in the estimation of the actual damage length based on measurements of the wheel lateral position at the detector passage. The literature review made found on the other hand, a previous study by the Swedish Transport Administration that has shown speed depending on type of injury oval wheels. It should be noted that the number of available data points were too small in this study carried out for it to qualify as statistically significant results. This was a consequence of the limitations mentioned above. The report shows the future need to investigate the velocity dependence in more detail and then provide the necessary knowledge for the adaptation of practices, standards and rules for speed reduction.

Project manager Dan Larsson, Damill AB

Project partners: Damill AB, the Swedish Transport Administration, Luleå University of Technology, eMaintenance365, Green Cargo, SJ