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SUMMARY
The inherent conflict between lateral stability and good curving performance in railcar design is explored in this paper. The work reported here presents the design tradeoffs between lateral stability and curving performance for the conventional North American three piece truck. Unlike many such design studies, the wheel cross sectional profile is treated as a design parameter.
This study revealed that designs with critical speed of 160 km/hr (100 mph) could be achieved with three very different wheel profiles. However, the highest conicity wheel profile allowed flange free running on the smallest radius curve (5.8 degree curve). The flange free curving limits were checked and modified if needed with a nonlinear, steady curving analysis.
When the wheel profile is adopted as a rail vehicle design parameter, both high lateral stability and good performance in curves can be obtained. Using the high conicity profile wheel is a simple way to solve the inherent conflict between the stability and curving performance.