Flange Climb Derailment Criteria and Wheel/Rail Profile Management and Maintenance Guidelines for Transit Operations (2005) / Chapter Skim
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From page 6... ...
These profiles were applied on both light rail and rapid transit vehicles with flange angles ranging from 60 degrees to 75 degrees and flange lengths ranging from 0.395 to 0.754 in. The proposed criteria have been validated by flange-climb test data using the TLV.
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From page 7... ...
as defined in Section 2.4: The limiting climb distance for a specific transit wheel profile can be derived from the above general criterion by substituting the maximum flange angle and flange length into Equation 2.4. It is especially useful for the transit wheel profiles that were not simulated in this report.
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From page 8... ...
with independent rolling wheels in the center truck, a Light Rail Vehicle Model 2 (LRV2) , and a Rapid Transit Vehicle (HRV)
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From page 9... ...
The AAR-1B wheel has a flange angle of 75 degrees and a flange length of 0.618 in. Under this condition, the limiting flange-climb-distance given from the general form of climb-distance criterion is a constant of 2.3 ft once the wheel L/V ratio exceeds the Nadal limit of 1.13 for a friction coefficient of 0.5, as shown by the straight line in Figure 2.5.
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From page 10... ...
The climb distance and average L/V in Table 2.4 were calculated for each run from the point where the L/V ratio exceeded 1.13. 2.8.1 Application of General Flange Climb Criterion The instrumented wheelset has the AAR-1B wheel profile with 75.13 degree maximum flange angle and 0.62 in.
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From page 11... ...
The climb distances of these two criteria also show that the general flange climb criterion is more conservative than the biparameter criterion. The reason for this is that the average L/V ratio in the test, which is 1.23, is lower than the 1.99 ratio used in the simulation to derive the general flange climb criterion.
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