Hunting Phenomenon Evolution of HSRS and Anti-hunting Absorbing Wide-Band Mechanism Solution

High-Speed Rolling Stock (HSRS) has the stability properties of closed-loop system dynamics, and the wear and abrasion of High-Speed Rails (HSR) are the sensitive factors to their evolution patterns. When considering the correlativity between the wear intensity of wheel-rail contact and the general mass of instability hunting oscillation, e.g. the primary/secondary hunting phenomena, the dialectical relations should be held within the track window for near-linear wheel-rail contacts so as to maintain hard the normal wear of wheel treads. Combined with some typical case studies, the full-vehicle stability properties and evolution patterns show that the self-stability of wheelset positioning under elastic constraints and the anti-hunting effectiveness of rotational resisting moments are the two important technical problems to cause the wear and abrasion of HSR. For some high-speed bogie configurations, the carbody yaw over-damped characteristics force the primary hunting phenomenon formed by both modes of rear bogie hunting and carbody rolling. Under the perturbations, like sidewind disturbances to carbodies or matching parameter variation of actual wheel-rail profiles, the primary hunting phenomenon is evolved to the secondary hunting one. As a result the high-speed carbody shaking phenomenon becomes one of important associated factors to the worn wheel-rail bad contacts. The anti-hunting absorbing wide-band mechanism solution was therefore proposed to instruct rightly the safe and comfortable design of high-speed bogies. With the improved high-speed bogies, V_lim = 480 km/h under λ_eN = (0.10–0.30), Max. 0.35 recommended, HSRS can be running on the extended routing crossover the different-graded lines.