Initial Situation
An ICN measuring train regularly measures the dynamic forces between wheel and rail on the high-speed curve sections of the SBB network, for example, along the southern foot of the Jura mountains. This is done using measuring wheelsets with sensors on the rotating wheels. These sensors are maintenance-intensive. It would be simpler to calculate the forces from acceleration sensors on the bogie. However, the physical relationship is complex and cannot be easily converted analytically.
SCS’s Contribution
To achieve this, SCS, in collaboration with the Bern University of Applied Sciences, specifically trained a model for the conditions of the SBB network and designed it so that the calculated values can be reviewed and understood by SBB specialists at any time.
Result
Wheel-rail forces can be calculated from simple acceleration sensors on the bogie. The maintenance-intensive sensors on the rotating wheels can largely be eliminated. The calculated values are traceable and reliable. The algorithm’s reliability is being tested, and measuring wheelsets are still occasionally used for validation.
from 250 m
covered curve radii in the SBB network.
up to 1.8 m/s²
covered lateral acceleration.
Wheel sensors largely saved
only simple acceleration sensors on the bogie.
