Heavy-duty railcars carry greater than typical payloads by employing additional wheelsets to lessen wheel/rail contact stresses. Rather than the common 4-axle designs, these cars may have up to 16 axles supporting one deck. Traditionally, these car types have not performed as well as desired. As a response, designers have created depressed center body styles to lower the overall center-of-gravity (CG) height. Such designs lead to more complexity and expense. In this investigation, a heavy-duty 8-axle flatcar has been modeled, both with a flat carbody and a depressed body style. Simulations of harmonic roll perturbations were performed using various CG heights, track perturbation wavelengths and operating speeds. Results include comparisons of design versus performance trade-offs.
Eight-Axle Railcar Carbody Roll Performance: Center of Gravity and Track Wavelength Effects
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Shust, W, Wilson, N, & Gurule, S. "Eight-Axle Railcar Carbody Roll Performance: Center of Gravity and Track Wavelength Effects." Proceedings of the ASME 2006 International Mechanical Engineering Congress and Exposition. Rail Transportation. Chicago, Illinois, USA. November 5–10, 2006. pp. 123-128. ASME. https://doi.org/10.1115/IMECE2006-14962
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