This is a most important part of my thesis. Locomotives have to have their bogie wheels replaced every three years because of slip and slide on the rails. Serious damage is done to the railway lines caused by slipping and sliding.
The principle in my design is to measure the circumference of each bogie wheel with an encoder while the locomotive is on a straight track. I do not ues the speed of the axle. The circumferential speed is recorded and if any bogie wheel dares to change from the recorded reference, then the DTU inverter will immediately correct that speed. Each bogie wheel is powered separetly by a permanent magnet 3 phase motor.
Dear Mr. Schaffer,
Actually, We have done similar research. It may be helpful for you. In order to estimate the rolling radius of a traction wheel, we have considered the speed sensor measurements to interpret rolling radius of the wheel. In addition, we have validated the methodology on a tram wheel roller rig. The article's title is "An unscented Kalman filter-based rolling radius estimation methodology for railway vehicles with traction" You can find it in Journal of Rail and Rapid Transit.
With my best regards,
Dr. Altan Onat
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