Wheel Bearing Impacts
#1
Posted 12 December 2018 - 09:22 PM
i) Starting Resistance: The starting resistance model in OR is a static model, ie it is always the same value. In reality this is not the case. Once a train has been running for a period of time the bearing grease heats up, and the starting resistance reduces. Similarly whilst the train is stationary, the wheel bearing cools down and the starting resistance increases. It is proposed to equip OR with a representative thermal model to adjust the starting resistance in snow conditions.
ii) Hot Axle Boxes - A challenge for a train crew could be the failure of an axle due to overheating. An example of the impacts of failed bearings is available here. It is proposed to equip OR with a representative thermal model to provide random hot axle box alarms and failures.
A blueprint covering this enhancement has been raised.
Based upon my research, in the event that a hot axle box was detected (either manually by the crew or automatically by a detection system), the train was required to stop for inspection by the train crew. Depending upon the severity of the problem, the crew may be required to travel to the next siding at a reduced speed, to shunt the offending wagon into the siding for repairs.
Thanks
#2
Posted 13 December 2018 - 08:19 AM
#3
Posted 13 December 2018 - 07:30 PM
ebnertra000, on 13 December 2018 - 08:19 AM, said:
Then, as in real life the bearing will overheat eventually, depending upon the train operation. Warning and Alarm messages will be provided as the bearing reaches designated temperatures. The driver will then have to take the appropriate action as laid down in the rules for hot boxes.
The Hot Box feature will be able to be activated by the user from the Options menu so that it will also work in explorer mode.
My personal preference is to also have a switch that an activity writer can use to override the Options checkbox, and thus force a Hotbox scenario sometime during an activity.
#4
Posted 14 December 2018 - 12:05 AM
there is already in OR the optional feature to set partial random failures in activities for OR (activity randomization). Maybe your interesting function could be inserted in that feature.
#5
Posted 14 December 2018 - 12:58 PM
#6
Posted 14 December 2018 - 02:15 PM
#7
Posted 15 December 2018 - 09:01 PM
ErickC, on 14 December 2018 - 02:15 PM, said:
I am happy to be pointed to any sites that provide specific details if this is not the case.
Thanks
#8
Posted 15 December 2018 - 09:15 PM
#9
Posted 15 December 2018 - 09:20 PM
ebnertra000, on 15 December 2018 - 09:15 PM, said:
Thanks for that.
I think that it would be helpful to see what operating conditions need to adhered to.
#10
Posted 15 December 2018 - 11:18 PM
steamer_ctn, on 15 December 2018 - 09:01 PM, said:
I am happy to be pointed to any sites that provide specific details if this is not the case.
Thanks
Maybe I phrased that poorly. My understanding is that all bearings have higher cold resistance, but plain bearings had so much resistance when cold that a long train would often need helpers just to get started.